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Ethereum CLIs Package

Library of Python wrappers for the different implementations of transition tools.

BesuTransitionTool

Bases: TransitionTool

Besu EvmTool Transition tool frontend wrapper class.

Source code in src/ethereum_clis/clis/besu.py 
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class BesuTransitionTool(TransitionTool):
    """
    Besu EvmTool Transition tool frontend wrapper class.
    """

    default_binary = Path("evm")
    detect_binary_pattern = compile(r"^Hyperledger Besu evm .*$")
    binary: Path
    cached_version: Optional[str] = None
    trace: bool
    process: Optional[subprocess.Popen] = None
    server_url: str
    besu_trace_dir: Optional[tempfile.TemporaryDirectory]

    def __init__(
        self,
        *,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        super().__init__(exception_mapper=BesuExceptionMapper(), binary=binary, trace=trace)
        args = [str(self.binary), "t8n", "--help"]
        try:
            result = subprocess.run(args, capture_output=True, text=True)
        except subprocess.CalledProcessError as e:
            raise Exception("evm process unexpectedly returned a non-zero status code: " f"{e}.")
        except Exception as e:
            raise Exception(f"Unexpected exception calling evm tool: {e}.")
        self.help_string = result.stdout
        self.besu_trace_dir = tempfile.TemporaryDirectory() if self.trace else None

    def start_server(self):
        """
        Starts the t8n-server process, extracts the port, and leaves it running for future re-use.
        """
        args = [
            str(self.binary),
            "t8n-server",
            "--port=0",  # OS assigned server port
        ]

        if self.trace:
            args.append("--trace")
            args.append(f"--output.basedir={self.besu_trace_dir.name}")

        self.process = subprocess.Popen(
            args=args,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
        )

        while True:
            line = str(self.process.stdout.readline())

            if not line or "Failed to start transition server" in line:
                raise Exception("Failed starting Besu subprocess\n" + line)
            if "Transition server listening on" in line:
                port = re.search("Transition server listening on (\\d+)", line).group(1)
                self.server_url = f"http://localhost:{port}/"
                break

    def shutdown(self):
        """
        Stops the t8n-server process if it was started
        """
        if self.process:
            self.process.kill()
        if self.besu_trace_dir:
            self.besu_trace_dir.cleanup()

    def evaluate(
        self,
        *,
        alloc: Alloc,
        txs: List[Transaction],
        env: Environment,
        fork: Fork,
        chain_id: int = 1,
        reward: int = 0,
        eips: Optional[List[int]] = None,
        debug_output_path: str = "",
        state_test: bool = False,
    ) -> TransitionToolOutput:
        """
        Executes `evm t8n` with the specified arguments.
        """
        if not self.process:
            self.start_server()

        fork_name = fork.transition_tool_name(
            block_number=env.number,
            timestamp=env.timestamp,
        )
        if eips is not None:
            fork_name = "+".join([fork_name] + [str(eip) for eip in eips])

        input_json = TransitionToolInput(
            alloc=alloc,
            txs=txs,
            env=env,
        ).model_dump(mode="json", **model_dump_config)

        state_json = {
            "fork": fork_name,
            "chainid": chain_id,
            "reward": reward,
        }

        post_data = {"state": state_json, "input": input_json}

        if debug_output_path:
            post_data_string = json.dumps(post_data, indent=4)
            additional_indent = " " * 16  # for pretty indentation in t8n.sh
            indented_post_data_string = "{\n" + "\n".join(
                additional_indent + line for line in post_data_string[1:].splitlines()
            )
            t8n_script = textwrap.dedent(
                f"""\
                #!/bin/bash
                # Use $1 as t8n-server port if provided, else default to 3000
                PORT=${{1:-3000}}
                curl http://localhost:${{PORT}}/ -X POST -H "Content-Type: application/json" \\
                --data '{indented_post_data_string}'
                """  # noqa: E221
            )
            dump_files_to_directory(
                debug_output_path,
                {
                    "state.json": state_json,
                    "input/alloc.json": input_json["alloc"],
                    "input/env.json": input_json["env"],
                    "input/txs.json": input_json["txs"],
                    "t8n.sh+x": t8n_script,
                },
            )

        response = requests.post(self.server_url, json=post_data, timeout=5)
        response.raise_for_status()  # exception visible in pytest failure output
        output: TransitionToolOutput = TransitionToolOutput.model_validate(response.json())

        if debug_output_path:
            dump_files_to_directory(
                debug_output_path,
                {
                    "response.txt": response.text,
                    "status_code.txt": response.status_code,
                    "time_elapsed_seconds.txt": response.elapsed.total_seconds(),
                },
            )

        if response.status_code != 200:
            raise Exception(
                f"t8n-server returned status code {response.status_code}, "
                f"response: {response.text}"
            )

        if debug_output_path:
            dump_files_to_directory(
                debug_output_path,
                {
                    "output/alloc.json": output.alloc.model_dump(mode="json", **model_dump_config),
                    "output/result.json": output.result.model_dump(
                        mode="json", **model_dump_config
                    ),
                    "output/txs.rlp": str(output.body),
                },
            )

        if self.trace and self.besu_trace_dir:
            self.collect_traces(output.result.receipts, self.besu_trace_dir, debug_output_path)
            for i, r in enumerate(output.result.receipts):
                trace_file_name = f"trace-{i}-{r.transaction_hash}.jsonl"
                os.remove(os.path.join(self.besu_trace_dir.name, trace_file_name))

        return output

    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool
        """
        return fork.transition_tool_name() in self.help_string

start_server()

Starts the t8n-server process, extracts the port, and leaves it running for future re-use.

Source code in src/ethereum_clis/clis/besu.py 
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def start_server(self):
    """
    Starts the t8n-server process, extracts the port, and leaves it running for future re-use.
    """
    args = [
        str(self.binary),
        "t8n-server",
        "--port=0",  # OS assigned server port
    ]

    if self.trace:
        args.append("--trace")
        args.append(f"--output.basedir={self.besu_trace_dir.name}")

    self.process = subprocess.Popen(
        args=args,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )

    while True:
        line = str(self.process.stdout.readline())

        if not line or "Failed to start transition server" in line:
            raise Exception("Failed starting Besu subprocess\n" + line)
        if "Transition server listening on" in line:
            port = re.search("Transition server listening on (\\d+)", line).group(1)
            self.server_url = f"http://localhost:{port}/"
            break

shutdown()

Stops the t8n-server process if it was started

Source code in src/ethereum_clis/clis/besu.py 
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def shutdown(self):
    """
    Stops the t8n-server process if it was started
    """
    if self.process:
        self.process.kill()
    if self.besu_trace_dir:
        self.besu_trace_dir.cleanup()

evaluate(*, alloc, txs, env, fork, chain_id=1, reward=0, eips=None, debug_output_path='', state_test=False)

Executes evm t8n with the specified arguments.

Source code in src/ethereum_clis/clis/besu.py 
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def evaluate(
    self,
    *,
    alloc: Alloc,
    txs: List[Transaction],
    env: Environment,
    fork: Fork,
    chain_id: int = 1,
    reward: int = 0,
    eips: Optional[List[int]] = None,
    debug_output_path: str = "",
    state_test: bool = False,
) -> TransitionToolOutput:
    """
    Executes `evm t8n` with the specified arguments.
    """
    if not self.process:
        self.start_server()

    fork_name = fork.transition_tool_name(
        block_number=env.number,
        timestamp=env.timestamp,
    )
    if eips is not None:
        fork_name = "+".join([fork_name] + [str(eip) for eip in eips])

    input_json = TransitionToolInput(
        alloc=alloc,
        txs=txs,
        env=env,
    ).model_dump(mode="json", **model_dump_config)

    state_json = {
        "fork": fork_name,
        "chainid": chain_id,
        "reward": reward,
    }

    post_data = {"state": state_json, "input": input_json}

    if debug_output_path:
        post_data_string = json.dumps(post_data, indent=4)
        additional_indent = " " * 16  # for pretty indentation in t8n.sh
        indented_post_data_string = "{\n" + "\n".join(
            additional_indent + line for line in post_data_string[1:].splitlines()
        )
        t8n_script = textwrap.dedent(
            f"""\
            #!/bin/bash
            # Use $1 as t8n-server port if provided, else default to 3000
            PORT=${{1:-3000}}
            curl http://localhost:${{PORT}}/ -X POST -H "Content-Type: application/json" \\
            --data '{indented_post_data_string}'
            """  # noqa: E221
        )
        dump_files_to_directory(
            debug_output_path,
            {
                "state.json": state_json,
                "input/alloc.json": input_json["alloc"],
                "input/env.json": input_json["env"],
                "input/txs.json": input_json["txs"],
                "t8n.sh+x": t8n_script,
            },
        )

    response = requests.post(self.server_url, json=post_data, timeout=5)
    response.raise_for_status()  # exception visible in pytest failure output
    output: TransitionToolOutput = TransitionToolOutput.model_validate(response.json())

    if debug_output_path:
        dump_files_to_directory(
            debug_output_path,
            {
                "response.txt": response.text,
                "status_code.txt": response.status_code,
                "time_elapsed_seconds.txt": response.elapsed.total_seconds(),
            },
        )

    if response.status_code != 200:
        raise Exception(
            f"t8n-server returned status code {response.status_code}, "
            f"response: {response.text}"
        )

    if debug_output_path:
        dump_files_to_directory(
            debug_output_path,
            {
                "output/alloc.json": output.alloc.model_dump(mode="json", **model_dump_config),
                "output/result.json": output.result.model_dump(
                    mode="json", **model_dump_config
                ),
                "output/txs.rlp": str(output.body),
            },
        )

    if self.trace and self.besu_trace_dir:
        self.collect_traces(output.result.receipts, self.besu_trace_dir, debug_output_path)
        for i, r in enumerate(output.result.receipts):
            trace_file_name = f"trace-{i}-{r.transaction_hash}.jsonl"
            os.remove(os.path.join(self.besu_trace_dir.name, trace_file_name))

    return output

is_fork_supported(fork)

Returns True if the fork is supported by the tool

Source code in src/ethereum_clis/clis/besu.py 
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def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool
    """
    return fork.transition_tool_name() in self.help_string

EthereumJSTransitionTool

Bases: TransitionTool

EthereumJS Transition tool interface wrapper class.

Source code in src/ethereum_clis/clis/ethereumjs.py 
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class EthereumJSTransitionTool(TransitionTool):
    """
    EthereumJS Transition tool interface wrapper class.
    """

    default_binary = Path("ethereumjs-t8ntool.sh")
    detect_binary_pattern = compile(r"^ethereumjs t8n\b")
    version_flag: str = "--version"
    t8n_use_stream = False

    binary: Path
    cached_version: Optional[str] = None
    trace: bool

    def __init__(
        self,
        *,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        super().__init__(exception_mapper=EthereumJSExceptionMapper(), binary=binary, trace=trace)

    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool.
        Currently, EthereumJS-t8n provides no way to determine supported forks.
        """
        return True

is_fork_supported(fork)

Returns True if the fork is supported by the tool. Currently, EthereumJS-t8n provides no way to determine supported forks.

Source code in src/ethereum_clis/clis/ethereumjs.py 
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def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool.
    Currently, EthereumJS-t8n provides no way to determine supported forks.
    """
    return True

EvmoneExceptionMapper

Bases: ExceptionMapper

Translate between EEST exceptions and error strings returned by evmone.

Source code in src/ethereum_clis/clis/evmone.py 
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class EvmoneExceptionMapper(ExceptionMapper):
    """
    Translate between EEST exceptions and error strings returned by evmone.
    """

    @property
    def _mapping_data(self):
        return [
            ExceptionMessage(
                TransactionException.TYPE_4_TX_CONTRACT_CREATION,
                "set code transaction must ",
            ),
            ExceptionMessage(
                TransactionException.TYPE_4_INVALID_AUTHORITY_SIGNATURE,
                "invalid authorization signature",
            ),
            ExceptionMessage(
                TransactionException.TYPE_4_INVALID_AUTHORITY_SIGNATURE_S_TOO_HIGH,
                "authorization signature s value too high",
            ),
            ExceptionMessage(
                TransactionException.TYPE_4_EMPTY_AUTHORIZATION_LIST,
                "empty authorization list",
            ),
            ExceptionMessage(
                TransactionException.INTRINSIC_GAS_TOO_LOW,
                "intrinsic gas too low",
            ),
            ExceptionMessage(
                TransactionException.TYPE_3_TX_MAX_BLOB_GAS_ALLOWANCE_EXCEEDED,
                "lob gas limit exceeded",
            ),
            ExceptionMessage(
                TransactionException.INITCODE_SIZE_EXCEEDED,
                "max initcode size exceeded",
            ),
            ExceptionMessage(
                TransactionException.INSUFFICIENT_ACCOUNT_FUNDS,
                "insufficient funds for gas * price + value",
            ),
            ExceptionMessage(
                TransactionException.INSUFFICIENT_MAX_FEE_PER_GAS,
                "max fee per gas less than block base fee",
            ),
            ExceptionMessage(
                TransactionException.INSUFFICIENT_MAX_FEE_PER_BLOB_GAS,
                "fee per gas less than block base fee",
            ),
            ExceptionMessage(
                TransactionException.TYPE_3_TX_PRE_FORK,
                "transaction type not supported",
            ),
            ExceptionMessage(
                TransactionException.TYPE_3_TX_INVALID_BLOB_VERSIONED_HASH,
                "invalid blob hash version",
            ),
            ExceptionMessage(
                TransactionException.TYPE_3_TX_BLOB_COUNT_EXCEEDED,
                "blob gas limit exceeded",
            ),
            ExceptionMessage(
                TransactionException.TYPE_3_TX_ZERO_BLOBS,
                "empty blob hashes list",
            ),
            # TODO EVMONE needs to differentiate when the section is missing in the header or body
            ExceptionMessage(EOFException.MISSING_STOP_OPCODE, "err: no_terminating_instruction"),
            ExceptionMessage(EOFException.MISSING_CODE_HEADER, "err: code_section_missing"),
            ExceptionMessage(EOFException.MISSING_TYPE_HEADER, "err: type_section_missing"),
            # TODO EVMONE these exceptions are too similar, this leeds to ambiguity
            ExceptionMessage(EOFException.MISSING_TERMINATOR, "err: header_terminator_missing"),
            ExceptionMessage(
                EOFException.MISSING_HEADERS_TERMINATOR, "err: section_headers_not_terminated"
            ),
            ExceptionMessage(EOFException.INVALID_VERSION, "err: eof_version_unknown"),
            ExceptionMessage(
                EOFException.INVALID_NON_RETURNING_FLAG, "err: invalid_non_returning_flag"
            ),
            ExceptionMessage(EOFException.INVALID_MAGIC, "err: invalid_prefix"),
            ExceptionMessage(
                EOFException.INVALID_FIRST_SECTION_TYPE, "err: invalid_first_section_type"
            ),
            ExceptionMessage(
                EOFException.INVALID_SECTION_BODIES_SIZE, "err: invalid_section_bodies_size"
            ),
            ExceptionMessage(
                EOFException.INVALID_TYPE_SECTION_SIZE, "err: invalid_type_section_size"
            ),
            ExceptionMessage(EOFException.INCOMPLETE_SECTION_SIZE, "err: incomplete_section_size"),
            ExceptionMessage(
                EOFException.INCOMPLETE_SECTION_NUMBER, "err: incomplete_section_number"
            ),
            ExceptionMessage(EOFException.TOO_MANY_CODE_SECTIONS, "err: too_many_code_sections"),
            ExceptionMessage(EOFException.ZERO_SECTION_SIZE, "err: zero_section_size"),
            ExceptionMessage(EOFException.MISSING_DATA_SECTION, "err: data_section_missing"),
            ExceptionMessage(EOFException.UNDEFINED_INSTRUCTION, "err: undefined_instruction"),
            ExceptionMessage(
                EOFException.INPUTS_OUTPUTS_NUM_ABOVE_LIMIT, "err: inputs_outputs_num_above_limit"
            ),
            ExceptionMessage(
                EOFException.UNREACHABLE_INSTRUCTIONS, "err: unreachable_instructions"
            ),
            ExceptionMessage(
                EOFException.INVALID_RJUMP_DESTINATION, "err: invalid_rjump_destination"
            ),
            ExceptionMessage(
                EOFException.UNREACHABLE_CODE_SECTIONS, "err: unreachable_code_sections"
            ),
            ExceptionMessage(EOFException.STACK_UNDERFLOW, "err: stack_underflow"),
            ExceptionMessage(
                EOFException.MAX_STACK_HEIGHT_ABOVE_LIMIT, "err: max_stack_height_above_limit"
            ),
            ExceptionMessage(
                EOFException.STACK_HIGHER_THAN_OUTPUTS, "err: stack_higher_than_outputs_required"
            ),
            ExceptionMessage(
                EOFException.JUMPF_DESTINATION_INCOMPATIBLE_OUTPUTS,
                "err: jumpf_destination_incompatible_outputs",
            ),
            ExceptionMessage(
                EOFException.INVALID_MAX_STACK_HEIGHT, "err: invalid_max_stack_height"
            ),
            ExceptionMessage(EOFException.INVALID_DATALOADN_INDEX, "err: invalid_dataloadn_index"),
            ExceptionMessage(EOFException.TRUNCATED_INSTRUCTION, "err: truncated_instruction"),
            ExceptionMessage(
                EOFException.TOPLEVEL_CONTAINER_TRUNCATED, "err: toplevel_container_truncated"
            ),
            ExceptionMessage(EOFException.ORPHAN_SUBCONTAINER, "err: unreferenced_subcontainer"),
            ExceptionMessage(
                EOFException.CONTAINER_SIZE_ABOVE_LIMIT, "err: container_size_above_limit"
            ),
            ExceptionMessage(
                EOFException.INVALID_CONTAINER_SECTION_INDEX,
                "err: invalid_container_section_index",
            ),
            ExceptionMessage(
                EOFException.INCOMPATIBLE_CONTAINER_KIND, "err: incompatible_container_kind"
            ),
            ExceptionMessage(EOFException.STACK_HEIGHT_MISMATCH, "err: stack_height_mismatch"),
            ExceptionMessage(EOFException.TOO_MANY_CONTAINERS, "err: too_many_container_sections"),
            ExceptionMessage(
                EOFException.INVALID_CODE_SECTION_INDEX, "err: invalid_code_section_index"
            ),
        ]

EvmOneTransitionTool

Bases: TransitionTool

Evmone evmone-t8n Transition tool interface wrapper class.

Source code in src/ethereum_clis/clis/evmone.py 
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class EvmOneTransitionTool(TransitionTool):
    """
    Evmone `evmone-t8n` Transition tool interface wrapper class.
    """

    default_binary = Path("evmone-t8n")
    detect_binary_pattern = compile(r"^evmone-t8n\b")
    t8n_use_stream = False

    binary: Path
    cached_version: Optional[str] = None
    trace: bool

    def __init__(
        self,
        *,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        super().__init__(exception_mapper=EvmoneExceptionMapper(), binary=binary, trace=trace)

    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool.
        Currently, evmone-t8n provides no way to determine supported forks.
        """
        return True

is_fork_supported(fork)

Returns True if the fork is supported by the tool. Currently, evmone-t8n provides no way to determine supported forks.

Source code in src/ethereum_clis/clis/evmone.py 
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def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool.
    Currently, evmone-t8n provides no way to determine supported forks.
    """
    return True

ExecutionSpecsTransitionTool

Bases: TransitionTool

Ethereum Specs EVM Resolver ethereum-spec-evm-resolver Transition Tool wrapper class.

ethereum-spec-evm-resolver is installed by default for execution-spec-tests: 

uv run fill --evm-bin=ethereum-spec-evm-resolver

To use a specific version of the ethereum-spec-evm-resolver tool, update it to the desired version in pyproject.toml.

The ethereum-spec-evm-resolver tool essentially wraps around the EELS evm daemon. It can handle requests for different EVM forks, even when those forks are implemented by different versions of EELS hosted in different places.

Source code in src/ethereum_clis/clis/execution_specs.py 
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class ExecutionSpecsTransitionTool(TransitionTool):
    """
    Ethereum Specs EVM Resolver `ethereum-spec-evm-resolver` Transition Tool wrapper class.

    `ethereum-spec-evm-resolver` is installed by default for `execution-spec-tests`:
    ```console
    uv run fill --evm-bin=ethereum-spec-evm-resolver
    ```

    To use a specific version of the `ethereum-spec-evm-resolver` tool, update it to the
    desired version in `pyproject.toml`.

    The `ethereum-spec-evm-resolver` tool essentially wraps around the EELS evm daemon. It can
    handle requests for different EVM forks, even when those forks are implemented by different
    versions of EELS hosted in different places.
    """

    default_binary = Path("ethereum-spec-evm-resolver")
    detect_binary_pattern = compile(r"^ethereum-spec-evm-resolver\b")
    t8n_use_server: bool = True
    server_dir: Optional[TemporaryDirectory] = None

    def __init__(
        self,
        *,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        super().__init__(
            exception_mapper=ExecutionSpecsExceptionMapper(), binary=binary, trace=trace
        )
        args = [str(self.binary), "--help"]
        try:
            result = subprocess.run(args, capture_output=True, text=True)
        except subprocess.CalledProcessError as e:
            raise Exception(
                "ethereum-spec-evm-resolver process unexpectedly returned a non-zero status code: "
                f"{e}."
            )
        except Exception as e:
            raise Exception(f"Unexpected exception calling ethereum-spec-evm-resolver: {e}.")
        self.help_string = result.stdout

    def start_server(self):
        """
        Starts the t8n-server process, extracts the port, and leaves it running for future re-use.
        """
        self.server_dir = TemporaryDirectory()
        self.server_file_path = Path(self.server_dir.name) / "t8n.sock"
        replaced_str = str(self.server_file_path).replace("/", "%2F")
        self.server_url = f"http+unix://{replaced_str}/"
        self.process = subprocess.Popen(
            args=[
                str(self.binary),
                "daemon",
                "--uds",
                self.server_file_path,
            ],
        )
        start = time.time()
        while True:
            if self.server_file_path.exists():
                break
            if time.time() - start > DAEMON_STARTUP_TIMEOUT_SECONDS:
                raise Exception("Failed starting ethereum-spec-evm subprocess")
            time.sleep(0)  # yield to other processes

    def shutdown(self):
        """
        Stops the t8n-server process if it was started.
        """
        if self.process:
            self.process.terminate()
        if self.server_dir:
            self.server_dir.cleanup()
            self.server_dir = None

    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool.

        If the fork is a transition fork, we want to check the fork it transitions to.

        `ethereum-spec-evm` appends newlines to forks in the help string.
        """
        return (fork.transition_tool_name() + "\n") in self.help_string

    def _generate_post_args(
        self, t8n_data: TransitionTool.TransitionToolData
    ) -> Dict[str, List[str] | str]:
        """
        Generate the arguments for the POST request to the t8n-server.

        EELS T8N expects `--state-test` when running a state test.
        """
        return {"arg": "--state-test"} if t8n_data.state_test else {}

start_server()

Starts the t8n-server process, extracts the port, and leaves it running for future re-use.

Source code in src/ethereum_clis/clis/execution_specs.py 
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def start_server(self):
    """
    Starts the t8n-server process, extracts the port, and leaves it running for future re-use.
    """
    self.server_dir = TemporaryDirectory()
    self.server_file_path = Path(self.server_dir.name) / "t8n.sock"
    replaced_str = str(self.server_file_path).replace("/", "%2F")
    self.server_url = f"http+unix://{replaced_str}/"
    self.process = subprocess.Popen(
        args=[
            str(self.binary),
            "daemon",
            "--uds",
            self.server_file_path,
        ],
    )
    start = time.time()
    while True:
        if self.server_file_path.exists():
            break
        if time.time() - start > DAEMON_STARTUP_TIMEOUT_SECONDS:
            raise Exception("Failed starting ethereum-spec-evm subprocess")
        time.sleep(0)  # yield to other processes

shutdown()

Stops the t8n-server process if it was started.

Source code in src/ethereum_clis/clis/execution_specs.py 
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def shutdown(self):
    """
    Stops the t8n-server process if it was started.
    """
    if self.process:
        self.process.terminate()
    if self.server_dir:
        self.server_dir.cleanup()
        self.server_dir = None

is_fork_supported(fork)

Returns True if the fork is supported by the tool.

If the fork is a transition fork, we want to check the fork it transitions to.

ethereum-spec-evm appends newlines to forks in the help string.

Source code in src/ethereum_clis/clis/execution_specs.py 
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def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool.

    If the fork is a transition fork, we want to check the fork it transitions to.

    `ethereum-spec-evm` appends newlines to forks in the help string.
    """
    return (fork.transition_tool_name() + "\n") in self.help_string

GethTransitionTool

Bases: TransitionTool

Go-ethereum evm Transition tool interface wrapper class.

Source code in src/ethereum_clis/clis/geth.py 
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class GethTransitionTool(TransitionTool):
    """
    Go-ethereum `evm` Transition tool interface wrapper class.
    """

    default_binary = Path("evm")
    detect_binary_pattern = compile(r"^evm(.exe)? version\b")
    t8n_subcommand: Optional[str] = "t8n"
    statetest_subcommand: Optional[str] = "statetest"
    blocktest_subcommand: Optional[str] = "blocktest"
    binary: Path
    cached_version: Optional[str] = None
    trace: bool
    t8n_use_stream = True

    def __init__(
        self,
        *,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        super().__init__(exception_mapper=GethExceptionMapper(), binary=binary, trace=trace)
        args = [str(self.binary), str(self.t8n_subcommand), "--help"]
        try:
            result = subprocess.run(args, capture_output=True, text=True)
        except subprocess.CalledProcessError as e:
            raise Exception("evm process unexpectedly returned a non-zero status code: " f"{e}.")
        except Exception as e:
            raise Exception(f"Unexpected exception calling evm tool: {e}.")
        self.help_string = result.stdout

    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool.

        If the fork is a transition fork, we want to check the fork it transitions to.
        """
        return fork.transition_tool_name() in self.help_string

    def get_blocktest_help(self) -> str:
        """
        Return the help string for the blocktest subcommand.
        """
        args = [str(self.binary), "blocktest", "--help"]
        try:
            result = subprocess.run(args, capture_output=True, text=True)
        except subprocess.CalledProcessError as e:
            raise Exception("evm process unexpectedly returned a non-zero status code: " f"{e}.")
        except Exception as e:
            raise Exception(f"Unexpected exception calling evm tool: {e}.")
        return result.stdout

    def is_verifiable(
        self,
        fixture_format: FixtureFormat,
    ) -> bool:
        """
        Returns whether the fixture format is verifiable by this Geth's evm tool.
        """
        return fixture_format in {StateFixture, BlockchainFixture}

    def verify_fixture(
        self,
        fixture_format: FixtureFormat,
        fixture_path: Path,
        fixture_name: Optional[str] = None,
        debug_output_path: Optional[Path] = None,
    ):
        """
        Executes `evm [state|block]test` to verify the fixture at `fixture_path`.
        """
        command: list[str] = [str(self.binary)]

        if debug_output_path:
            command += ["--debug", "--json", "--verbosity", "100"]

        if fixture_format == StateFixture:
            assert self.statetest_subcommand, "statetest subcommand not set"
            command.append(self.statetest_subcommand)
        elif fixture_format == BlockchainFixture:
            assert self.blocktest_subcommand, "blocktest subcommand not set"
            command.append(self.blocktest_subcommand)
        else:
            raise Exception(f"Invalid test fixture format: {fixture_format}")

        if fixture_name and fixture_format == BlockchainFixture:
            assert isinstance(fixture_name, str), "fixture_name must be a string"
            command.append("--run")
            command.append(fixture_name)
        command.append(str(fixture_path))

        result = subprocess.run(
            command,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
        )

        if debug_output_path:
            debug_fixture_path = debug_output_path / "fixtures.json"
            # Use the local copy of the fixture in the debug directory
            verify_fixtures_call = " ".join(command[:-1]) + f" {debug_fixture_path}"
            verify_fixtures_script = textwrap.dedent(
                f"""\
                #!/bin/bash
                {verify_fixtures_call}
                """
            )
            dump_files_to_directory(
                str(debug_output_path),
                {
                    "verify_fixtures_args.py": command,
                    "verify_fixtures_returncode.txt": result.returncode,
                    "verify_fixtures_stdout.txt": result.stdout.decode(),
                    "verify_fixtures_stderr.txt": result.stderr.decode(),
                    "verify_fixtures.sh+x": verify_fixtures_script,
                },
            )
            shutil.copyfile(fixture_path, debug_fixture_path)

        if result.returncode != 0:
            raise Exception(
                f"EVM test failed.\n{' '.join(command)}\n\n Error:\n{result.stderr.decode()}"
            )

        if fixture_format == StateFixture:
            result_json = json.loads(result.stdout.decode())
            if not isinstance(result_json, list):
                raise Exception(f"Unexpected result from evm statetest: {result_json}")
        else:
            result_json = []  # there is no parseable format for blocktest output
        return result_json

is_fork_supported(fork)

Returns True if the fork is supported by the tool.

If the fork is a transition fork, we want to check the fork it transitions to.

Source code in src/ethereum_clis/clis/geth.py 
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def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool.

    If the fork is a transition fork, we want to check the fork it transitions to.
    """
    return fork.transition_tool_name() in self.help_string

get_blocktest_help()

Return the help string for the blocktest subcommand.

Source code in src/ethereum_clis/clis/geth.py 
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def get_blocktest_help(self) -> str:
    """
    Return the help string for the blocktest subcommand.
    """
    args = [str(self.binary), "blocktest", "--help"]
    try:
        result = subprocess.run(args, capture_output=True, text=True)
    except subprocess.CalledProcessError as e:
        raise Exception("evm process unexpectedly returned a non-zero status code: " f"{e}.")
    except Exception as e:
        raise Exception(f"Unexpected exception calling evm tool: {e}.")
    return result.stdout

is_verifiable(fixture_format)

Returns whether the fixture format is verifiable by this Geth's evm tool.

Source code in src/ethereum_clis/clis/geth.py 
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def is_verifiable(
    self,
    fixture_format: FixtureFormat,
) -> bool:
    """
    Returns whether the fixture format is verifiable by this Geth's evm tool.
    """
    return fixture_format in {StateFixture, BlockchainFixture}

verify_fixture(fixture_format, fixture_path, fixture_name=None, debug_output_path=None)

Executes evm [state|block]test to verify the fixture at fixture_path.

Source code in src/ethereum_clis/clis/geth.py 
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def verify_fixture(
    self,
    fixture_format: FixtureFormat,
    fixture_path: Path,
    fixture_name: Optional[str] = None,
    debug_output_path: Optional[Path] = None,
):
    """
    Executes `evm [state|block]test` to verify the fixture at `fixture_path`.
    """
    command: list[str] = [str(self.binary)]

    if debug_output_path:
        command += ["--debug", "--json", "--verbosity", "100"]

    if fixture_format == StateFixture:
        assert self.statetest_subcommand, "statetest subcommand not set"
        command.append(self.statetest_subcommand)
    elif fixture_format == BlockchainFixture:
        assert self.blocktest_subcommand, "blocktest subcommand not set"
        command.append(self.blocktest_subcommand)
    else:
        raise Exception(f"Invalid test fixture format: {fixture_format}")

    if fixture_name and fixture_format == BlockchainFixture:
        assert isinstance(fixture_name, str), "fixture_name must be a string"
        command.append("--run")
        command.append(fixture_name)
    command.append(str(fixture_path))

    result = subprocess.run(
        command,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
    )

    if debug_output_path:
        debug_fixture_path = debug_output_path / "fixtures.json"
        # Use the local copy of the fixture in the debug directory
        verify_fixtures_call = " ".join(command[:-1]) + f" {debug_fixture_path}"
        verify_fixtures_script = textwrap.dedent(
            f"""\
            #!/bin/bash
            {verify_fixtures_call}
            """
        )
        dump_files_to_directory(
            str(debug_output_path),
            {
                "verify_fixtures_args.py": command,
                "verify_fixtures_returncode.txt": result.returncode,
                "verify_fixtures_stdout.txt": result.stdout.decode(),
                "verify_fixtures_stderr.txt": result.stderr.decode(),
                "verify_fixtures.sh+x": verify_fixtures_script,
            },
        )
        shutil.copyfile(fixture_path, debug_fixture_path)

    if result.returncode != 0:
        raise Exception(
            f"EVM test failed.\n{' '.join(command)}\n\n Error:\n{result.stderr.decode()}"
        )

    if fixture_format == StateFixture:
        result_json = json.loads(result.stdout.decode())
        if not isinstance(result_json, list):
            raise Exception(f"Unexpected result from evm statetest: {result_json}")
    else:
        result_json = []  # there is no parseable format for blocktest output
    return result_json

NimbusTransitionTool

Bases: TransitionTool

Nimbus evm Transition tool interface wrapper class.

Source code in src/ethereum_clis/clis/nimbus.py 
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class NimbusTransitionTool(TransitionTool):
    """
    Nimbus `evm` Transition tool interface wrapper class.
    """

    default_binary = Path("t8n")
    detect_binary_pattern = compile(r"^Nimbus-t8n\b")
    version_flag: str = "--version"

    binary: Path
    cached_version: Optional[str] = None
    trace: bool

    def __init__(
        self,
        *,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        super().__init__(exception_mapper=NimbusExceptionMapper(), binary=binary, trace=trace)
        args = [str(self.binary), "--help"]
        try:
            result = subprocess.run(args, capture_output=True, text=True)
        except subprocess.CalledProcessError as e:
            raise Exception("evm process unexpectedly returned a non-zero status code: " f"{e}.")
        except Exception as e:
            raise Exception(f"Unexpected exception calling evm tool: {e}.")
        self.help_string = result.stdout

    def version(self) -> str:
        """
        Gets `evm` binary version.
        """
        if self.cached_version is None:
            self.cached_version = re.sub(r"\x1b\[0m", "", super().version()).strip()

        return self.cached_version

    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool.

        If the fork is a transition fork, we want to check the fork it transitions to.
        """
        return fork.transition_tool_name() in self.help_string

version()

Gets evm binary version.

Source code in src/ethereum_clis/clis/nimbus.py 
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def version(self) -> str:
    """
    Gets `evm` binary version.
    """
    if self.cached_version is None:
        self.cached_version = re.sub(r"\x1b\[0m", "", super().version()).strip()

    return self.cached_version

is_fork_supported(fork)

Returns True if the fork is supported by the tool.

If the fork is a transition fork, we want to check the fork it transitions to.

Source code in src/ethereum_clis/clis/nimbus.py 
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def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool.

    If the fork is a transition fork, we want to check the fork it transitions to.
    """
    return fork.transition_tool_name() in self.help_string

CLINotFoundInPath

Bases: Exception

Exception raised if the specified CLI binary is not found in the path

Source code in src/ethereum_clis/ethereum_cli.py 
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class CLINotFoundInPath(Exception):
    """Exception raised if the specified CLI binary is not found in the path"""

    def __init__(self, message="The CLI binary was not found in the path", binary=None):
        if binary:
            message = f"{message} ({binary})"
        super().__init__(message)

UnknownCLI

Bases: Exception

Exception raised if an unknown CLI is encountered

Source code in src/ethereum_clis/ethereum_cli.py 
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class UnknownCLI(Exception):
    """Exception raised if an unknown CLI is encountered"""

    pass

TransitionTool

Bases: EthereumCLI, FixtureVerifier

Transition tool abstract base class which should be inherited by all transition tool implementations.

Source code in src/ethereum_clis/transition_tool.py 
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class TransitionTool(EthereumCLI, FixtureVerifier):
    """
    Transition tool abstract base class which should be inherited by all transition tool
    implementations.
    """

    traces: List[List[List[Dict]]] | None = None

    registered_tools: List[Type["TransitionTool"]] = []
    default_tool: Optional[Type["TransitionTool"]] = None

    t8n_subcommand: Optional[str] = None
    statetest_subcommand: Optional[str] = None
    blocktest_subcommand: Optional[str] = None
    cached_version: Optional[str] = None
    t8n_use_stream: bool = False

    t8n_use_server: bool = False
    server_url: str
    process: Optional[subprocess.Popen] = None

    @abstractmethod
    def __init__(
        self,
        *,
        exception_mapper: ExceptionMapper,
        binary: Optional[Path] = None,
        trace: bool = False,
    ):
        """
        Abstract initialization method that all subclasses must implement.
        """
        self.exception_mapper = exception_mapper
        super().__init__(binary=binary)
        self.trace = trace

    def __init_subclass__(cls):
        """
        Registers all subclasses of TransitionTool as possible tools.
        """
        TransitionTool.register_tool(cls)

    @abstractmethod
    def is_fork_supported(self, fork: Fork) -> bool:
        """
        Returns True if the fork is supported by the tool
        """
        pass

    def start_server(self):
        """
        Starts the t8n-server process, extracts the port, and leaves it running for future re-use.
        """
        pass

    def shutdown(self):
        """
        Perform any cleanup tasks related to the tested tool.
        """
        pass

    def reset_traces(self):
        """
        Resets the internal trace storage for a new test to begin
        """
        self.traces = None

    def append_traces(self, new_traces: List[List[Dict]]):
        """
        Appends a list of traces of a state transition to the current list
        """
        if self.traces is None:
            self.traces = []
        self.traces.append(new_traces)

    def get_traces(self) -> List[List[List[Dict]]] | None:
        """
        Returns the accumulated traces
        """
        return self.traces

    def collect_traces(
        self,
        receipts: List[TransactionReceipt],
        temp_dir: tempfile.TemporaryDirectory,
        debug_output_path: str = "",
    ) -> None:
        """
        Collect the traces from the t8n tool output and store them in the traces list.
        """
        traces: List[List[Dict]] = []
        for i, r in enumerate(receipts):
            trace_file_name = f"trace-{i}-{r.transaction_hash}.jsonl"
            if debug_output_path:
                shutil.copy(
                    os.path.join(temp_dir.name, trace_file_name),
                    os.path.join(debug_output_path, trace_file_name),
                )
            with open(os.path.join(temp_dir.name, trace_file_name), "r") as trace_file:
                tx_traces: List[Dict] = []
                for trace_line in trace_file.readlines():
                    tx_traces.append(json.loads(trace_line))
                traces.append(tx_traces)
        self.append_traces(traces)

    @dataclass
    class TransitionToolData:
        """
        Transition tool files and data to pass between methods
        """

        alloc: Alloc
        txs: List[Transaction]
        env: Environment
        fork_name: str
        chain_id: int = field(default=1)
        reward: int = field(default=0)
        state_test: bool = field(default=False)

        def to_input(self) -> TransitionToolInput:
            """
            Convert the data to a TransactionToolInput object
            """
            return TransitionToolInput(
                alloc=self.alloc,
                txs=self.txs,
                env=self.env,
            )

    def _evaluate_filesystem(
        self,
        *,
        t8n_data: TransitionToolData,
        debug_output_path: str = "",
    ) -> TransitionToolOutput:
        """
        Executes a transition tool using the filesystem for its inputs and outputs.
        """
        temp_dir = tempfile.TemporaryDirectory()
        os.mkdir(os.path.join(temp_dir.name, "input"))
        os.mkdir(os.path.join(temp_dir.name, "output"))

        input_contents = t8n_data.to_input().model_dump(mode="json", **model_dump_config)

        input_paths = {
            k: os.path.join(temp_dir.name, "input", f"{k}.json") for k in input_contents.keys()
        }
        for key, file_path in input_paths.items():
            write_json_file(input_contents[key], file_path)

        output_paths = {
            output: os.path.join("output", f"{output}.json") for output in ["alloc", "result"]
        }
        output_paths["body"] = os.path.join("output", "txs.rlp")

        # Construct args for evmone-t8n binary
        args = [
            str(self.binary),
            "--state.fork",
            t8n_data.fork_name,
            "--input.alloc",
            input_paths["alloc"],
            "--input.env",
            input_paths["env"],
            "--input.txs",
            input_paths["txs"],
            "--output.basedir",
            temp_dir.name,
            "--output.result",
            output_paths["result"],
            "--output.alloc",
            output_paths["alloc"],
            "--output.body",
            output_paths["body"],
            "--state.reward",
            str(t8n_data.reward),
            "--state.chainid",
            str(t8n_data.chain_id),
        ]

        if self.trace:
            args.append("--trace")

        result = subprocess.run(
            args,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
        )

        if debug_output_path:
            if os.path.exists(debug_output_path):
                shutil.rmtree(debug_output_path)
            shutil.copytree(temp_dir.name, debug_output_path)
            t8n_output_base_dir = os.path.join(debug_output_path, "t8n.sh.out")
            t8n_call = " ".join(args)
            for file_path in input_paths.values():  # update input paths
                t8n_call = t8n_call.replace(
                    os.path.dirname(file_path), os.path.join(debug_output_path, "input")
                )
            t8n_call = t8n_call.replace(  # use a new output path for basedir and outputs
                temp_dir.name,
                t8n_output_base_dir,
            )
            t8n_script = textwrap.dedent(
                f"""\
                #!/bin/bash
                rm -rf {debug_output_path}/t8n.sh.out  # hard-coded to avoid surprises
                mkdir -p {debug_output_path}/t8n.sh.out/output
                {t8n_call}
                """
            )
            dump_files_to_directory(
                debug_output_path,
                {
                    "args.py": args,
                    "returncode.txt": result.returncode,
                    "stdout.txt": result.stdout.decode(),
                    "stderr.txt": result.stderr.decode(),
                    "t8n.sh+x": t8n_script,
                },
            )

        if result.returncode != 0:
            raise Exception("failed to evaluate: " + result.stderr.decode())

        for key, file_path in output_paths.items():
            output_paths[key] = os.path.join(temp_dir.name, file_path)

        output_contents = {}
        for key, file_path in output_paths.items():
            if "txs.rlp" in file_path:
                continue
            with open(file_path, "r+") as file:
                output_contents[key] = json.load(file)
        output = TransitionToolOutput(**output_contents)
        if self.trace:
            self.collect_traces(output.result.receipts, temp_dir, debug_output_path)

        temp_dir.cleanup()

        return output

    def _server_post(
        self,
        data: Dict[str, Any],
        url_args: Dict[str, List[str] | str] = {},
        retries: int = 5,
    ) -> Response:
        """
        Send a POST request to the t8n-server and return the response.
        """
        post_delay = 0.1
        while True:
            try:
                response = Session().post(
                    f"{self.server_url}?{urlencode(url_args, doseq=True)}",
                    json=data,
                    timeout=20,
                )
                break
            except ConnectionError as e:
                retries -= 1
                if retries == 0:
                    raise e
                time.sleep(post_delay)
                post_delay *= 2
        response.raise_for_status()
        if response.status_code != 200:
            raise Exception(
                f"t8n-server returned status code {response.status_code}, "
                f"response: {response.text}"
            )
        return response

    def _generate_post_args(self, t8n_data: TransitionToolData) -> Dict[str, List[str] | str]:
        """
        Generate the arguments for the POST request to the t8n-server.
        """
        return {}

    def _evaluate_server(
        self,
        *,
        t8n_data: TransitionToolData,
        debug_output_path: str = "",
    ) -> TransitionToolOutput:
        """
        Executes the transition tool sending inputs and outputs via a server.
        """
        input_contents = t8n_data.to_input()
        input_json = input_contents.model_dump(mode="json", **model_dump_config)
        post_data = {
            "state": {
                "fork": t8n_data.fork_name,
                "chainid": t8n_data.chain_id,
                "reward": t8n_data.reward,
            },
            "input": input_json,
        }

        if debug_output_path:
            request_info = (
                f"Server URL: {self.server_url}\n\n"
                f"Request Data:\n{json.dumps(post_data, indent=2)}\n"
            )
            dump_files_to_directory(
                debug_output_path,
                {
                    "input/alloc.json": input_contents.alloc,
                    "input/env.json": input_contents.env,
                    "input/txs.json": [
                        tx.model_dump(mode="json", **model_dump_config)
                        for tx in input_contents.txs
                    ],
                    "request_info.txt": request_info,
                },
            )

        response = self._server_post(data=post_data, url_args=self._generate_post_args(t8n_data))
        output: TransitionToolOutput = TransitionToolOutput.model_validate(response.json())

        if debug_output_path:
            response_info = (
                f"Status Code: {response.status_code}\n\n"
                f"Headers:\n{json.dumps(dict(response.headers), indent=2)}\n\n"
                f"Content:\n{response.text}\n"
            )
            dump_files_to_directory(
                debug_output_path,
                {
                    "output/alloc.json": output.alloc,
                    "output/result.json": output.result,
                    "output/txs.rlp": str(output.body),
                    "response_info.txt": response_info,
                },
            )

        return output

    def _evaluate_stream(
        self,
        *,
        t8n_data: TransitionToolData,
        debug_output_path: str = "",
    ) -> TransitionToolOutput:
        """
        Executes a transition tool using stdin and stdout for its inputs and outputs.
        """
        temp_dir = tempfile.TemporaryDirectory()
        args = self.construct_args_stream(t8n_data, temp_dir)

        stdin = t8n_data.to_input()

        result = subprocess.run(
            args,
            input=stdin.model_dump_json(**model_dump_config).encode(),
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
        )

        self.dump_debug_stream(debug_output_path, temp_dir, stdin, args, result)

        if result.returncode != 0:
            raise Exception("failed to evaluate: " + result.stderr.decode())

        output: TransitionToolOutput = TransitionToolOutput.model_validate_json(result.stdout)

        if debug_output_path:
            dump_files_to_directory(
                debug_output_path,
                {
                    "output/alloc.json": output.alloc,
                    "output/result.json": output.result,
                    "output/txs.rlp": str(output.body),
                },
            )

        if self.trace:
            self.collect_traces(output.result.receipts, temp_dir, debug_output_path)
            temp_dir.cleanup()

        return output

    def construct_args_stream(
        self, t8n_data: TransitionToolData, temp_dir: tempfile.TemporaryDirectory
    ) -> List[str]:
        """
        Construct arguments for t8n interaction via streams
        """
        command: list[str] = [str(self.binary)]
        if self.t8n_subcommand:
            command.append(self.t8n_subcommand)

        args = command + [
            "--input.alloc=stdin",
            "--input.txs=stdin",
            "--input.env=stdin",
            "--output.result=stdout",
            "--output.alloc=stdout",
            "--output.body=stdout",
            f"--state.fork={t8n_data.fork_name}",
            f"--state.chainid={t8n_data.chain_id}",
            f"--state.reward={t8n_data.reward}",
        ]

        if self.trace:
            args.append("--trace")
            args.append(f"--output.basedir={temp_dir.name}")
        return args

    def dump_debug_stream(
        self,
        debug_output_path: str,
        temp_dir: tempfile.TemporaryDirectory,
        stdin: TransitionToolInput,
        args: List[str],
        result: subprocess.CompletedProcess,
    ):
        """
        Export debug files if requested when interacting with t8n via streams
        """
        if not debug_output_path:
            return

        t8n_call = " ".join(args)
        t8n_output_base_dir = os.path.join(debug_output_path, "t8n.sh.out")
        if self.trace:
            t8n_call = t8n_call.replace(temp_dir.name, t8n_output_base_dir)
        t8n_script = textwrap.dedent(
            f"""\
            #!/bin/bash
            rm -rf {debug_output_path}/t8n.sh.out  # hard-coded to avoid surprises
            mkdir {debug_output_path}/t8n.sh.out  # unused if tracing is not enabled
            {t8n_call} < {debug_output_path}/stdin.txt
            """
        )
        dump_files_to_directory(
            debug_output_path,
            {
                "args.py": args,
                "input/alloc.json": stdin.alloc,
                "input/env.json": stdin.env,
                "input/txs.json": [
                    tx.model_dump(mode="json", **model_dump_config) for tx in stdin.txs
                ],
                "returncode.txt": result.returncode,
                "stdin.txt": stdin,
                "stdout.txt": result.stdout.decode(),
                "stderr.txt": result.stderr.decode(),
                "t8n.sh+x": t8n_script,
            },
        )

    def evaluate(
        self,
        *,
        alloc: Alloc,
        txs: List[Transaction],
        env: Environment,
        fork: Fork,
        chain_id: int = 1,
        reward: int = 0,
        eips: Optional[List[int]] = None,
        debug_output_path: str = "",
        state_test: bool = False,
    ) -> TransitionToolOutput:
        """
        Executes the relevant evaluate method as required by the `t8n` tool.

        If a client's `t8n` tool varies from the default behavior, this method
        can be overridden.
        """
        fork_name = fork.transition_tool_name(
            block_number=env.number,
            timestamp=env.timestamp,
        )
        if eips is not None:
            fork_name = "+".join([fork_name] + [str(eip) for eip in eips])
        if env.number == 0:
            reward = -1
        t8n_data = self.TransitionToolData(
            alloc=alloc,
            txs=txs,
            env=env,
            fork_name=fork_name,
            chain_id=chain_id,
            reward=reward,
            state_test=state_test,
        )

        if self.t8n_use_server:
            if not self.process:
                self.start_server()
            return self._evaluate_server(t8n_data=t8n_data, debug_output_path=debug_output_path)

        if self.t8n_use_stream:
            return self._evaluate_stream(t8n_data=t8n_data, debug_output_path=debug_output_path)

        return self._evaluate_filesystem(
            t8n_data=t8n_data,
            debug_output_path=debug_output_path,
        )

    def verify_fixture(
        self,
        fixture_format: FixtureFormat,
        fixture_path: Path,
        fixture_name: Optional[str] = None,
        debug_output_path: Optional[Path] = None,
    ):
        """
        Executes `evm [state|block]test` to verify the fixture at `fixture_path`.

        Currently only implemented by geth's evm.
        """
        raise NotImplementedError(
            "The `verify_fixture()` function is not supported by this tool. Use geth's evm tool."
        )

__init__(*, exception_mapper, binary=None, trace=False) abstractmethod

Abstract initialization method that all subclasses must implement.

Source code in src/ethereum_clis/transition_tool.py 
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@abstractmethod
def __init__(
    self,
    *,
    exception_mapper: ExceptionMapper,
    binary: Optional[Path] = None,
    trace: bool = False,
):
    """
    Abstract initialization method that all subclasses must implement.
    """
    self.exception_mapper = exception_mapper
    super().__init__(binary=binary)
    self.trace = trace

__init_subclass__()

Registers all subclasses of TransitionTool as possible tools.

Source code in src/ethereum_clis/transition_tool.py 
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def __init_subclass__(cls):
    """
    Registers all subclasses of TransitionTool as possible tools.
    """
    TransitionTool.register_tool(cls)

is_fork_supported(fork) abstractmethod

Returns True if the fork is supported by the tool

Source code in src/ethereum_clis/transition_tool.py 
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@abstractmethod
def is_fork_supported(self, fork: Fork) -> bool:
    """
    Returns True if the fork is supported by the tool
    """
    pass

start_server()

Starts the t8n-server process, extracts the port, and leaves it running for future re-use.

Source code in src/ethereum_clis/transition_tool.py 
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def start_server(self):
    """
    Starts the t8n-server process, extracts the port, and leaves it running for future re-use.
    """
    pass

shutdown()

Perform any cleanup tasks related to the tested tool.

Source code in src/ethereum_clis/transition_tool.py 
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def shutdown(self):
    """
    Perform any cleanup tasks related to the tested tool.
    """
    pass

reset_traces()

Resets the internal trace storage for a new test to begin

Source code in src/ethereum_clis/transition_tool.py 
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def reset_traces(self):
    """
    Resets the internal trace storage for a new test to begin
    """
    self.traces = None

append_traces(new_traces)

Appends a list of traces of a state transition to the current list

Source code in src/ethereum_clis/transition_tool.py 
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def append_traces(self, new_traces: List[List[Dict]]):
    """
    Appends a list of traces of a state transition to the current list
    """
    if self.traces is None:
        self.traces = []
    self.traces.append(new_traces)

get_traces()

Returns the accumulated traces

Source code in src/ethereum_clis/transition_tool.py 
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def get_traces(self) -> List[List[List[Dict]]] | None:
    """
    Returns the accumulated traces
    """
    return self.traces

collect_traces(receipts, temp_dir, debug_output_path='')

Collect the traces from the t8n tool output and store them in the traces list.

Source code in src/ethereum_clis/transition_tool.py 
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def collect_traces(
    self,
    receipts: List[TransactionReceipt],
    temp_dir: tempfile.TemporaryDirectory,
    debug_output_path: str = "",
) -> None:
    """
    Collect the traces from the t8n tool output and store them in the traces list.
    """
    traces: List[List[Dict]] = []
    for i, r in enumerate(receipts):
        trace_file_name = f"trace-{i}-{r.transaction_hash}.jsonl"
        if debug_output_path:
            shutil.copy(
                os.path.join(temp_dir.name, trace_file_name),
                os.path.join(debug_output_path, trace_file_name),
            )
        with open(os.path.join(temp_dir.name, trace_file_name), "r") as trace_file:
            tx_traces: List[Dict] = []
            for trace_line in trace_file.readlines():
                tx_traces.append(json.loads(trace_line))
            traces.append(tx_traces)
    self.append_traces(traces)

TransitionToolData dataclass

Transition tool files and data to pass between methods

Source code in src/ethereum_clis/transition_tool.py 
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@dataclass
class TransitionToolData:
    """
    Transition tool files and data to pass between methods
    """

    alloc: Alloc
    txs: List[Transaction]
    env: Environment
    fork_name: str
    chain_id: int = field(default=1)
    reward: int = field(default=0)
    state_test: bool = field(default=False)

    def to_input(self) -> TransitionToolInput:
        """
        Convert the data to a TransactionToolInput object
        """
        return TransitionToolInput(
            alloc=self.alloc,
            txs=self.txs,
            env=self.env,
        )

to_input()

Convert the data to a TransactionToolInput object

Source code in src/ethereum_clis/transition_tool.py 
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def to_input(self) -> TransitionToolInput:
    """
    Convert the data to a TransactionToolInput object
    """
    return TransitionToolInput(
        alloc=self.alloc,
        txs=self.txs,
        env=self.env,
    )

construct_args_stream(t8n_data, temp_dir)

Construct arguments for t8n interaction via streams

Source code in src/ethereum_clis/transition_tool.py 
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def construct_args_stream(
    self, t8n_data: TransitionToolData, temp_dir: tempfile.TemporaryDirectory
) -> List[str]:
    """
    Construct arguments for t8n interaction via streams
    """
    command: list[str] = [str(self.binary)]
    if self.t8n_subcommand:
        command.append(self.t8n_subcommand)

    args = command + [
        "--input.alloc=stdin",
        "--input.txs=stdin",
        "--input.env=stdin",
        "--output.result=stdout",
        "--output.alloc=stdout",
        "--output.body=stdout",
        f"--state.fork={t8n_data.fork_name}",
        f"--state.chainid={t8n_data.chain_id}",
        f"--state.reward={t8n_data.reward}",
    ]

    if self.trace:
        args.append("--trace")
        args.append(f"--output.basedir={temp_dir.name}")
    return args

dump_debug_stream(debug_output_path, temp_dir, stdin, args, result)

Export debug files if requested when interacting with t8n via streams

Source code in src/ethereum_clis/transition_tool.py 
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def dump_debug_stream(
    self,
    debug_output_path: str,
    temp_dir: tempfile.TemporaryDirectory,
    stdin: TransitionToolInput,
    args: List[str],
    result: subprocess.CompletedProcess,
):
    """
    Export debug files if requested when interacting with t8n via streams
    """
    if not debug_output_path:
        return

    t8n_call = " ".join(args)
    t8n_output_base_dir = os.path.join(debug_output_path, "t8n.sh.out")
    if self.trace:
        t8n_call = t8n_call.replace(temp_dir.name, t8n_output_base_dir)
    t8n_script = textwrap.dedent(
        f"""\
        #!/bin/bash
        rm -rf {debug_output_path}/t8n.sh.out  # hard-coded to avoid surprises
        mkdir {debug_output_path}/t8n.sh.out  # unused if tracing is not enabled
        {t8n_call} < {debug_output_path}/stdin.txt
        """
    )
    dump_files_to_directory(
        debug_output_path,
        {
            "args.py": args,
            "input/alloc.json": stdin.alloc,
            "input/env.json": stdin.env,
            "input/txs.json": [
                tx.model_dump(mode="json", **model_dump_config) for tx in stdin.txs
            ],
            "returncode.txt": result.returncode,
            "stdin.txt": stdin,
            "stdout.txt": result.stdout.decode(),
            "stderr.txt": result.stderr.decode(),
            "t8n.sh+x": t8n_script,
        },
    )

evaluate(*, alloc, txs, env, fork, chain_id=1, reward=0, eips=None, debug_output_path='', state_test=False)

Executes the relevant evaluate method as required by the t8n tool.

If a client's t8n tool varies from the default behavior, this method can be overridden.

Source code in src/ethereum_clis/transition_tool.py 
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def evaluate(
    self,
    *,
    alloc: Alloc,
    txs: List[Transaction],
    env: Environment,
    fork: Fork,
    chain_id: int = 1,
    reward: int = 0,
    eips: Optional[List[int]] = None,
    debug_output_path: str = "",
    state_test: bool = False,
) -> TransitionToolOutput:
    """
    Executes the relevant evaluate method as required by the `t8n` tool.

    If a client's `t8n` tool varies from the default behavior, this method
    can be overridden.
    """
    fork_name = fork.transition_tool_name(
        block_number=env.number,
        timestamp=env.timestamp,
    )
    if eips is not None:
        fork_name = "+".join([fork_name] + [str(eip) for eip in eips])
    if env.number == 0:
        reward = -1
    t8n_data = self.TransitionToolData(
        alloc=alloc,
        txs=txs,
        env=env,
        fork_name=fork_name,
        chain_id=chain_id,
        reward=reward,
        state_test=state_test,
    )

    if self.t8n_use_server:
        if not self.process:
            self.start_server()
        return self._evaluate_server(t8n_data=t8n_data, debug_output_path=debug_output_path)

    if self.t8n_use_stream:
        return self._evaluate_stream(t8n_data=t8n_data, debug_output_path=debug_output_path)

    return self._evaluate_filesystem(
        t8n_data=t8n_data,
        debug_output_path=debug_output_path,
    )

verify_fixture(fixture_format, fixture_path, fixture_name=None, debug_output_path=None)

Executes evm [state|block]test to verify the fixture at fixture_path.

Currently only implemented by geth's evm.

Source code in src/ethereum_clis/transition_tool.py 
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def verify_fixture(
    self,
    fixture_format: FixtureFormat,
    fixture_path: Path,
    fixture_name: Optional[str] = None,
    debug_output_path: Optional[Path] = None,
):
    """
    Executes `evm [state|block]test` to verify the fixture at `fixture_path`.

    Currently only implemented by geth's evm.
    """
    raise NotImplementedError(
        "The `verify_fixture()` function is not supported by this tool. Use geth's evm tool."
    )

Result

Bases: CamelModel

Result of a t8n

Source code in src/ethereum_clis/types.py 
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class Result(CamelModel):
    """
    Result of a t8n
    """

    state_root: Hash
    ommers_hash: Hash | None = Field(None, validation_alias="sha3Uncles")
    transactions_trie: Hash = Field(..., alias="txRoot")
    receipts_root: Hash
    logs_hash: Hash
    logs_bloom: Bloom
    receipts: List[TransactionReceipt]
    rejected_transactions: List[RejectedTransaction] = Field(
        default_factory=list, alias="rejected"
    )
    difficulty: HexNumber | None = Field(None, alias="currentDifficulty")
    gas_used: HexNumber
    base_fee_per_gas: HexNumber | None = Field(None, alias="currentBaseFee")
    withdrawals_root: Hash | None = None
    excess_blob_gas: HexNumber | None = Field(None, alias="currentExcessBlobGas")
    blob_gas_used: HexNumber | None = None
    requests_hash: Hash | None = None
    requests: List[Bytes] | None = None

TransitionToolOutput

Bases: CamelModel

Transition tool output

Source code in src/ethereum_clis/types.py 
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class TransitionToolOutput(CamelModel):
    """
    Transition tool output
    """

    alloc: Alloc
    result: Result
    body: Bytes | None = None