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prefect_docker.host

Module containing Docker host settings.

Classes

DockerHost

Bases: Block

Block used to manage settings for interacting with a Docker host.

Attributes:

Name Type Description
base_url Optional[str]

URL to the Docker server, e.g. unix:///var/run/docker.sock or tcp://127.0.0.1:1234. If this is not set, the client will be configured from environment variables.
version str

The version of the API to use. Set to auto to automatically detect the server's version.
timeout Optional[int]

Default timeout for API calls, in seconds.
max_pool_size Optional[int]

The maximum number of connections to save in the pool.
client_kwargs Dict[str, Any]

Additional keyword arguments to pass to docker.from_env() or DockerClient.

Examples:

Get a Docker Host client. 

from prefect_docker import DockerHost

docker_host = DockerHost(
base_url="tcp://127.0.0.1:1234",
    max_pool_size=4
)
with docker_host.get_client() as client:
    ... # Use the client for Docker operations

Source code in prefect_docker/host.py 
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class DockerHost(Block):
    """
    Block used to manage settings for interacting with a Docker host.

    Attributes:
        base_url: URL to the Docker server, e.g. `unix:///var/run/docker.sock`
            or `tcp://127.0.0.1:1234`. If this is not set, the client will
            be configured from environment variables.
        version: The version of the API to use. Set to auto to
            automatically detect the server's version.
        timeout: Default timeout for API calls, in seconds.
        max_pool_size: The maximum number of connections to save in the pool.
        client_kwargs: Additional keyword arguments to pass to
            `docker.from_env()` or `DockerClient`.

    Examples:
        Get a Docker Host client.
        ```python
        from prefect_docker import DockerHost

        docker_host = DockerHost(
        base_url="tcp://127.0.0.1:1234",
            max_pool_size=4
        )
        with docker_host.get_client() as client:
            ... # Use the client for Docker operations
        ```
    """

    _block_type_name = "Docker Host"
    _logo_url = "https://cdn.sanity.io/images/3ugk85nk/production/14a315b79990200db7341e42553e23650b34bb96-250x250.png"  # noqa
    _description = "Store settings for interacting with a Docker host."

    base_url: Optional[str] = Field(
        default=None,
        description="URL to the Docker host.",
        title="Base URL",
        example="unix:///var/run/docker.sock",
    )
    version: str = Field(default="auto", description="The version of the API to use")
    timeout: Optional[int] = Field(
        default=None, description="Default timeout for API calls, in seconds."
    )
    max_pool_size: Optional[int] = Field(
        default=None,
        description="The maximum number of connections to save in the pool.",
    )
    client_kwargs: Dict[str, Any] = Field(
        default_factory=dict,
        title="Additional Configuration",
        description=(
            "Additional keyword arguments to pass to "
            "`docker.from_env()` or `DockerClient`."
        ),
    )

    def get_client(self) -> docker.DockerClient:
        """
        Gets a Docker Client to communicate with a Docker host.

        Returns:
            A Docker Client.
        """
        logger = get_run_logger()
        client_kwargs = {
            "version": self.version,
            "timeout": self.timeout,
            "max_pool_size": self.max_pool_size,
            **self.client_kwargs,
        }
        client_kwargs = {
            key: value for key, value in client_kwargs.items() if value is not None
        }
        if self.base_url is None:
            logger.debug(
                f"Creating a Docker client from "
                f"environment variables, using {self.version} version."
            )
            client = _ContextManageableDockerClient.from_env(**client_kwargs)
        else:
            logger.debug(
                f"Creating a Docker client to {self.base_url} "
                f"using {self.version} version."
            )
            client = _ContextManageableDockerClient(
                base_url=self.base_url, **client_kwargs
            )
        return client

Functions

get_client

Gets a Docker Client to communicate with a Docker host.

Returns:

Type Description
DockerClient

A Docker Client.
Source code in prefect_docker/host.py 
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def get_client(self) -> docker.DockerClient:
    """
    Gets a Docker Client to communicate with a Docker host.

    Returns:
        A Docker Client.
    """
    logger = get_run_logger()
    client_kwargs = {
        "version": self.version,
        "timeout": self.timeout,
        "max_pool_size": self.max_pool_size,
        **self.client_kwargs,
    }
    client_kwargs = {
        key: value for key, value in client_kwargs.items() if value is not None
    }
    if self.base_url is None:
        logger.debug(
            f"Creating a Docker client from "
            f"environment variables, using {self.version} version."
        )
        client = _ContextManageableDockerClient.from_env(**client_kwargs)
    else:
        logger.debug(
            f"Creating a Docker client to {self.base_url} "
            f"using {self.version} version."
        )
        client = _ContextManageableDockerClient(
            base_url=self.base_url, **client_kwargs
        )
    return client