prefect.deployments

Objects for specifying deployments and utilities for loading flows from deployments.

Deployment

Bases: BaseModel

A Prefect Deployment definition, used for specifying and building deployments.

Parameters:

Name	Type	Description	Default
name		A name for the deployment (required).	required
version		An optional version for the deployment; defaults to the flow's version	required
description		An optional description of the deployment; defaults to the flow's description	required
tags		An optional list of tags to associate with this deployment; note that tags are used only for organizational purposes. For delegating work to agents, see work_queue_name.	required
schedule		A schedule to run this deployment on, once registered	required
is_schedule_active		Whether or not the schedule is active	required
work_queue_name		The work queue that will handle this deployment's runs	required
flow_name		The name of the flow this deployment encapsulates	required
parameters		A dictionary of parameter values to pass to runs created from this deployment	required
infrastructure		An optional infrastructure block used to configure infrastructure for runs; if not provided, will default to running this deployment in Agent subprocesses	required
infra_overrides		A dictionary of dot delimited infrastructure overrides that will be applied at runtime; for example env.CONFIG_KEY=config_value or namespace='prefect'	required
storage		An optional remote storage block used to store and retrieve this workflow; if not provided, will default to referencing this flow by its local path	required
path		The path to the working directory for the workflow, relative to remote storage or, if stored on a local filesystem, an absolute path	required
entrypoint		The path to the entrypoint for the workflow, always relative to the path	required
parameter_openapi_schema		The parameter schema of the flow, including defaults.	required

Examples:

Create a new deployment using configuration defaults for an imported flow:

>>> from my_project.flows import my_flow
>>> from prefect.deployments import Deployment
>>>
>>> deployment = Deployment.build_from_flow(
...     flow=my_flow,
...     name="example",
...     version="1",
...     tags=["demo"],
>>> )
>>> deployment.apply()

Create a new deployment with custom storage and an infrastructure override:

>>> from my_project.flows import my_flow
>>> from prefect.deployments import Deployment
>>> from prefect.filesystems import S3

>>> storage = S3.load("dev-bucket") # load a pre-defined block
>>> deployment = Deployment.build_from_flow(
...     flow=my_flow,
...     name="s3-example",
...     version="2",
...     tags=["aws"],
...     storage=storage,
...     infra_overrides=dict("env.PREFECT_LOGGING_LEVEL"="DEBUG"),
>>> )
>>> deployment.apply()

Source code in prefect/deployments.py

@experimental_field(
    "work_pool_name",
    group="work_pools",
    when=lambda x: x is not None and x != DEFAULT_AGENT_WORK_POOL_NAME,
)
class Deployment(BaseModel):
    """
    A Prefect Deployment definition, used for specifying and building deployments.

    Args:
        name: A name for the deployment (required).
        version: An optional version for the deployment; defaults to the flow's version
        description: An optional description of the deployment; defaults to the flow's description
        tags: An optional list of tags to associate with this deployment; note that tags are
            used only for organizational purposes. For delegating work to agents, see `work_queue_name`.
        schedule: A schedule to run this deployment on, once registered
        is_schedule_active: Whether or not the schedule is active
        work_queue_name: The work queue that will handle this deployment's runs
        flow_name: The name of the flow this deployment encapsulates
        parameters: A dictionary of parameter values to pass to runs created from this deployment
        infrastructure: An optional infrastructure block used to configure infrastructure for runs;
            if not provided, will default to running this deployment in Agent subprocesses
        infra_overrides: A dictionary of dot delimited infrastructure overrides that will be applied at
            runtime; for example `env.CONFIG_KEY=config_value` or `namespace='prefect'`
        storage: An optional remote storage block used to store and retrieve this workflow;
            if not provided, will default to referencing this flow by its local path
        path: The path to the working directory for the workflow, relative to remote storage or,
            if stored on a local filesystem, an absolute path
        entrypoint: The path to the entrypoint for the workflow, always relative to the `path`
        parameter_openapi_schema: The parameter schema of the flow, including defaults.

    Examples:

        Create a new deployment using configuration defaults for an imported flow:

        >>> from my_project.flows import my_flow
        >>> from prefect.deployments import Deployment
        >>>
        >>> deployment = Deployment.build_from_flow(
        ...     flow=my_flow,
        ...     name="example",
        ...     version="1",
        ...     tags=["demo"],
        >>> )
        >>> deployment.apply()

        Create a new deployment with custom storage and an infrastructure override:

        >>> from my_project.flows import my_flow
        >>> from prefect.deployments import Deployment
        >>> from prefect.filesystems import S3

        >>> storage = S3.load("dev-bucket") # load a pre-defined block
        >>> deployment = Deployment.build_from_flow(
        ...     flow=my_flow,
        ...     name="s3-example",
        ...     version="2",
        ...     tags=["aws"],
        ...     storage=storage,
        ...     infra_overrides=dict("env.PREFECT_LOGGING_LEVEL"="DEBUG"),
        >>> )
        >>> deployment.apply()

    """

    class Config:
        json_encoders = {SecretDict: lambda v: v.dict()}
        validate_assignment = True
        extra = "forbid"

    @property
    def _editable_fields(self) -> List[str]:
        editable_fields = [
            "name",
            "description",
            "version",
            "work_queue_name",
            "work_pool_name",
            "tags",
            "parameters",
            "schedule",
            "is_schedule_active",
            "infra_overrides",
        ]

        # if infrastructure is baked as a pre-saved block, then
        # editing its fields will not update anything
        if self.infrastructure._block_document_id:
            return editable_fields
        else:
            return editable_fields + ["infrastructure"]

    @property
    def location(self) -> str:
        """
        The 'location' that this deployment points to is given by `path` alone
        in the case of no remote storage, and otherwise by `storage.basepath / path`.

        The underlying flow entrypoint is interpreted relative to this location.
        """
        location = ""
        if self.storage:
            location = (
                self.storage.basepath + "/"
                if not self.storage.basepath.endswith("/")
                else ""
            )
        if self.path:
            location += self.path
        return location

    @sync_compatible
    async def to_yaml(self, path: Path) -> None:
        yaml_dict = self._yaml_dict()
        schema = self.schema()

        with open(path, "w") as f:
            # write header
            f.write(
                "###\n### A complete description of a Prefect Deployment for flow"
                f" {self.flow_name!r}\n###\n"
            )

            # write editable fields
            for field in self._editable_fields:
                # write any comments
                if schema["properties"][field].get("yaml_comment"):
                    f.write(f"# {schema['properties'][field]['yaml_comment']}\n")
                # write the field
                yaml.dump({field: yaml_dict[field]}, f, sort_keys=False)

            # write non-editable fields
            f.write("\n###\n### DO NOT EDIT BELOW THIS LINE\n###\n")
            yaml.dump(
                {k: v for k, v in yaml_dict.items() if k not in self._editable_fields},
                f,
                sort_keys=False,
            )

    def _yaml_dict(self) -> dict:
        """
        Returns a YAML-compatible representation of this deployment as a dictionary.
        """
        # avoids issues with UUIDs showing up in YAML
        all_fields = json.loads(
            self.json(
                exclude={
                    "storage": {"_filesystem", "filesystem", "_remote_file_system"}
                }
            )
        )
        if all_fields["storage"]:
            all_fields["storage"][
                "_block_type_slug"
            ] = self.storage.get_block_type_slug()
        if all_fields["infrastructure"]:
            all_fields["infrastructure"][
                "_block_type_slug"
            ] = self.infrastructure.get_block_type_slug()
        return all_fields

    # top level metadata
    name: str = Field(..., description="The name of the deployment.")
    description: Optional[str] = Field(
        default=None, description="An optional description of the deployment."
    )
    version: Optional[str] = Field(
        default=None, description="An optional version for the deployment."
    )
    tags: List[str] = Field(
        default_factory=list,
        description="One of more tags to apply to this deployment.",
    )
    schedule: schemas.schedules.SCHEDULE_TYPES = None
    is_schedule_active: Optional[bool] = Field(
        default=None, description="Whether or not the schedule is active."
    )
    flow_name: Optional[str] = Field(default=None, description="The name of the flow.")
    work_queue_name: Optional[str] = Field(
        "default",
        description="The work queue for the deployment.",
        yaml_comment="The work queue that will handle this deployment's runs",
    )
    work_pool_name: Optional[str] = Field(
        default=None, description="The work pool for the deployment"
    )
    # flow data
    parameters: Dict[str, Any] = Field(default_factory=dict)
    manifest_path: Optional[str] = Field(
        default=None,
        description=(
            "The path to the flow's manifest file, relative to the chosen storage."
        ),
    )
    infrastructure: Infrastructure = Field(default_factory=Process)
    infra_overrides: Dict[str, Any] = Field(
        default_factory=dict,
        description="Overrides to apply to the base infrastructure block at runtime.",
    )
    storage: Optional[Block] = Field(
        None,
        help="The remote storage to use for this workflow.",
    )
    path: Optional[str] = Field(
        default=None,
        description=(
            "The path to the working directory for the workflow, relative to remote"
            " storage or an absolute path."
        ),
    )
    entrypoint: Optional[str] = Field(
        default=None,
        description=(
            "The path to the entrypoint for the workflow, relative to the `path`."
        ),
    )
    parameter_openapi_schema: ParameterSchema = Field(
        default_factory=ParameterSchema,
        description="The parameter schema of the flow, including defaults.",
    )
    timestamp: datetime = Field(default_factory=partial(pendulum.now, "UTC"))

    @validator("infrastructure", pre=True)
    def infrastructure_must_have_capabilities(cls, value):
        if isinstance(value, dict):
            if "_block_type_slug" in value:
                # Replace private attribute with public for dispatch
                value["block_type_slug"] = value.pop("_block_type_slug")
            block = Block(**value)
        elif value is None:
            return value
        else:
            block = value

        if "run-infrastructure" not in block.get_block_capabilities():
            raise ValueError(
                "Infrastructure block must have 'run-infrastructure' capabilities."
            )
        return block

    @validator("storage", pre=True)
    def storage_must_have_capabilities(cls, value):
        if isinstance(value, dict):
            block_type = lookup_type(Block, value.pop("_block_type_slug"))
            block = block_type(**value)
        elif value is None:
            return value
        else:
            block = value

        capabilities = block.get_block_capabilities()
        if "get-directory" not in capabilities:
            raise ValueError(
                "Remote Storage block must have 'get-directory' capabilities."
            )
        return block

    @validator("parameter_openapi_schema", pre=True)
    def handle_openapi_schema(cls, value):
        """
        This method ensures setting a value of `None` is handled gracefully.
        """
        if value is None:
            return ParameterSchema()
        return value

    @classmethod
    @sync_compatible
    async def load_from_yaml(cls, path: str):
        with open(str(path), "r") as f:
            data = yaml.safe_load(f)

            # load blocks from server to ensure secret values are properly hydrated
            if data["storage"]:
                block_doc_name = data["storage"].get("_block_document_name")
                # if no doc name, this block is not stored on the server
                if block_doc_name:
                    block_slug = data["storage"]["_block_type_slug"]
                    block = await Block.load(f"{block_slug}/{block_doc_name}")
                    data["storage"] = block

            if data["infrastructure"]:
                block_doc_name = data["infrastructure"].get("_block_document_name")
                # if no doc name, this block is not stored on the server
                if block_doc_name:
                    block_slug = data["infrastructure"]["_block_type_slug"]
                    block = await Block.load(f"{block_slug}/{block_doc_name}")
                    data["infrastructure"] = block

            return cls(**data)

    @sync_compatible
    async def load(self) -> bool:
        """
        Queries the API for a deployment with this name for this flow, and if found, prepopulates
        any settings that were not set at initialization.

        Returns a boolean specifying whether a load was successful or not.

        Raises:
            - ValueError: if both name and flow name are not set
        """
        if not self.name or not self.flow_name:
            raise ValueError("Both a deployment name and flow name must be provided.")
        async with get_client() as client:
            try:
                deployment = await client.read_deployment_by_name(
                    f"{self.flow_name}/{self.name}"
                )
                if deployment.storage_document_id:
                    storage = Block._from_block_document(
                        await client.read_block_document(deployment.storage_document_id)
                    )

                excluded_fields = self.__fields_set__.union(
                    {"infrastructure", "storage", "timestamp"}
                )
                for field in set(self.__fields__.keys()) - excluded_fields:
                    new_value = getattr(deployment, field)
                    setattr(self, field, new_value)

                if "infrastructure" not in self.__fields_set__:
                    if deployment.infrastructure_document_id:
                        self.infrastructure = Block._from_block_document(
                            await client.read_block_document(
                                deployment.infrastructure_document_id
                            )
                        )
                if "storage" not in self.__fields_set__:
                    if deployment.storage_document_id:
                        self.storage = Block._from_block_document(
                            await client.read_block_document(
                                deployment.storage_document_id
                            )
                        )
            except ObjectNotFound:
                return False
        return True

    @sync_compatible
    async def update(self, ignore_none: bool = False, **kwargs):
        """
        Performs an in-place update with the provided settings.

        Args:
            ignore_none: if True, all `None` values are ignored when performing the update
        """
        unknown_keys = set(kwargs.keys()) - set(self.dict().keys())
        if unknown_keys:
            raise ValueError(
                f"Received unexpected attributes: {', '.join(unknown_keys)}"
            )
        for key, value in kwargs.items():
            if ignore_none and value is None:
                continue
            setattr(self, key, value)

    @sync_compatible
    async def upload_to_storage(
        self, storage_block: str = None, ignore_file: str = ".prefectignore"
    ) -> Optional[int]:
        """
        Uploads the workflow this deployment represents using a provided storage block;
        if no block is provided, defaults to configuring self for local storage.

        Args:
            storage_block: a string reference a remote storage block slug `$type/$name`; if provided,
                used to upload the workflow's project
            ignore_file: an optional path to a `.prefectignore` file that specifies filename patterns
                to ignore when uploading to remote storage; if not provided, looks for `.prefectignore`
                in the current working directory
        """
        deployment_path = None
        file_count = None
        if storage_block:
            storage = await Block.load(storage_block)

            if "put-directory" not in storage.get_block_capabilities():
                raise BlockMissingCapabilities(
                    f"Storage block {storage!r} missing 'put-directory' capability."
                )

            self.storage = storage

            # upload current directory to storage location
            file_count = await self.storage.put_directory(
                ignore_file=ignore_file, to_path=self.path
            )
        elif self.storage:
            if "put-directory" not in self.storage.get_block_capabilities():
                raise BlockMissingCapabilities(
                    f"Storage block {self.storage!r} missing 'put-directory'"
                    " capability."
                )

            file_count = await self.storage.put_directory(
                ignore_file=ignore_file, to_path=self.path
            )

        # persists storage now in case it contains secret values
        if self.storage and not self.storage._block_document_id:
            await self.storage._save(is_anonymous=True)

        return file_count

    @sync_compatible
    async def apply(
        self, upload: bool = False, work_queue_concurrency: int = None
    ) -> UUID:
        """
        Registers this deployment with the API and returns the deployment's ID.

        Args:
            upload: if True, deployment files are automatically uploaded to remote storage
            work_queue_concurrency: If provided, sets the concurrency limit on the deployment's work queue
        """
        if not self.name or not self.flow_name:
            raise ValueError("Both a deployment name and flow name must be set.")
        async with get_client() as client:
            # prep IDs
            flow_id = await client.create_flow_from_name(self.flow_name)

            infrastructure_document_id = self.infrastructure._block_document_id
            if not infrastructure_document_id:
                # if not building off a block, will create an anonymous block
                self.infrastructure = self.infrastructure.copy()
                infrastructure_document_id = await self.infrastructure._save(
                    is_anonymous=True,
                )

            if upload:
                await self.upload_to_storage()

            if self.work_queue_name and work_queue_concurrency is not None:
                try:
                    res = await client.create_work_queue(
                        name=self.work_queue_name, work_pool_name=self.work_pool_name
                    )
                except ObjectAlreadyExists:
                    res = await client.read_work_queue_by_name(
                        name=self.work_queue_name, work_pool_name=self.work_pool_name
                    )
                await client.update_work_queue(
                    res.id, concurrency_limit=work_queue_concurrency
                )

            # we assume storage was already saved
            storage_document_id = getattr(self.storage, "_block_document_id", None)
            deployment_id = await client.create_deployment(
                flow_id=flow_id,
                name=self.name,
                work_queue_name=self.work_queue_name,
                work_pool_name=self.work_pool_name,
                version=self.version,
                schedule=self.schedule,
                is_schedule_active=self.is_schedule_active,
                parameters=self.parameters,
                description=self.description,
                tags=self.tags,
                manifest_path=self.manifest_path,  # allows for backwards YAML compat
                path=self.path,
                entrypoint=self.entrypoint,
                infra_overrides=self.infra_overrides,
                storage_document_id=storage_document_id,
                infrastructure_document_id=infrastructure_document_id,
                parameter_openapi_schema=self.parameter_openapi_schema.dict(),
            )

            return deployment_id

    @classmethod
    @sync_compatible
    async def build_from_flow(
        cls,
        flow: Flow,
        name: str,
        output: str = None,
        skip_upload: bool = False,
        ignore_file: str = ".prefectignore",
        apply: bool = False,
        load_existing: bool = True,
        **kwargs,
    ) -> "Deployment":
        """
        Configure a deployment for a given flow.

        Args:
            flow: A flow function to deploy
            name: A name for the deployment
            output (optional): if provided, the full deployment specification will be written as a YAML
                file in the location specified by `output`
            skip_upload: if True, deployment files are not automatically uploaded to remote storage
            ignore_file: an optional path to a `.prefectignore` file that specifies filename patterns
                to ignore when uploading to remote storage; if not provided, looks for `.prefectignore`
                in the current working directory
            apply: if True, the deployment is automatically registered with the API
            load_existing: if True, load any settings that may already be configured for the named deployment
                server-side (e.g., schedules, default parameter values, etc.)
            **kwargs: other keyword arguments to pass to the constructor for the `Deployment` class
        """
        if not name:
            raise ValueError("A deployment name must be provided.")

        # note that `deployment.load` only updates settings that were *not*
        # provided at initialization
        deployment = cls(name=name, **kwargs)
        deployment.flow_name = flow.name
        if not deployment.entrypoint:
            ## first see if an entrypoint can be determined
            flow_file = getattr(flow, "__globals__", {}).get("__file__")
            mod_name = getattr(flow, "__module__", None)
            if not flow_file:
                if not mod_name:
                    # todo, check if the file location was manually set already
                    raise ValueError("Could not determine flow's file location.")
                module = importlib.import_module(mod_name)
                flow_file = getattr(module, "__file__", None)
                if not flow_file:
                    raise ValueError("Could not determine flow's file location.")

            # set entrypoint
            entry_path = Path(flow_file).absolute().relative_to(Path(".").absolute())
            deployment.entrypoint = f"{entry_path}:{flow.fn.__name__}"

        if load_existing:
            await deployment.load()

        # set a few attributes for this flow object
        deployment.parameter_openapi_schema = parameter_schema(flow)

        if not deployment.version:
            deployment.version = flow.version
        if not deployment.description:
            deployment.description = flow.description

        # proxy for whether infra is docker-based
        is_docker_based = hasattr(deployment.infrastructure, "image")

        if not deployment.storage and not is_docker_based and not deployment.path:
            deployment.path = str(Path(".").absolute())
        elif not deployment.storage and is_docker_based:
            # only update if a path is not already set
            if not deployment.path:
                deployment.path = "/opt/prefect/flows"

        if not skip_upload:
            if (
                deployment.storage
                and "put-directory" in deployment.storage.get_block_capabilities()
            ):
                await deployment.upload_to_storage(ignore_file=ignore_file)

        if output:
            await deployment.to_yaml(output)

        if apply:
            await deployment.apply()

        return deployment

location: str property

The 'location' that this deployment points to is given by path alone in the case of no remote storage, and otherwise by storage.basepath / path.

The underlying flow entrypoint is interpreted relative to this location.

apply async

Registers this deployment with the API and returns the deployment's ID.

Parameters:

Name	Type	Description	Default
upload	bool	if True, deployment files are automatically uploaded to remote storage	False
work_queue_concurrency	int	If provided, sets the concurrency limit on the deployment's work queue	None

Source code in prefect/deployments.py

@sync_compatible
async def apply(
    self, upload: bool = False, work_queue_concurrency: int = None
) -> UUID:
    """
    Registers this deployment with the API and returns the deployment's ID.

    Args:
        upload: if True, deployment files are automatically uploaded to remote storage
        work_queue_concurrency: If provided, sets the concurrency limit on the deployment's work queue
    """
    if not self.name or not self.flow_name:
        raise ValueError("Both a deployment name and flow name must be set.")
    async with get_client() as client:
        # prep IDs
        flow_id = await client.create_flow_from_name(self.flow_name)

        infrastructure_document_id = self.infrastructure._block_document_id
        if not infrastructure_document_id:
            # if not building off a block, will create an anonymous block
            self.infrastructure = self.infrastructure.copy()
            infrastructure_document_id = await self.infrastructure._save(
                is_anonymous=True,
            )

        if upload:
            await self.upload_to_storage()

        if self.work_queue_name and work_queue_concurrency is not None:
            try:
                res = await client.create_work_queue(
                    name=self.work_queue_name, work_pool_name=self.work_pool_name
                )
            except ObjectAlreadyExists:
                res = await client.read_work_queue_by_name(
                    name=self.work_queue_name, work_pool_name=self.work_pool_name
                )
            await client.update_work_queue(
                res.id, concurrency_limit=work_queue_concurrency
            )

        # we assume storage was already saved
        storage_document_id = getattr(self.storage, "_block_document_id", None)
        deployment_id = await client.create_deployment(
            flow_id=flow_id,
            name=self.name,
            work_queue_name=self.work_queue_name,
            work_pool_name=self.work_pool_name,
            version=self.version,
            schedule=self.schedule,
            is_schedule_active=self.is_schedule_active,
            parameters=self.parameters,
            description=self.description,
            tags=self.tags,
            manifest_path=self.manifest_path,  # allows for backwards YAML compat
            path=self.path,
            entrypoint=self.entrypoint,
            infra_overrides=self.infra_overrides,
            storage_document_id=storage_document_id,
            infrastructure_document_id=infrastructure_document_id,
            parameter_openapi_schema=self.parameter_openapi_schema.dict(),
        )

        return deployment_id

build_from_flow classmethod async

Configure a deployment for a given flow.

Parameters:

Name	Type	Description	Default
flow	Flow	A flow function to deploy	required
name	str	A name for the deployment	required
output	optional	if provided, the full deployment specification will be written as a YAML file in the location specified by output	None
skip_upload	bool	if True, deployment files are not automatically uploaded to remote storage	False
ignore_file	str	an optional path to a .prefectignore file that specifies filename patterns to ignore when uploading to remote storage; if not provided, looks for .prefectignore in the current working directory	'.prefectignore'
apply	bool	if True, the deployment is automatically registered with the API	False
load_existing	bool	if True, load any settings that may already be configured for the named deployment server-side (e.g., schedules, default parameter values, etc.)	True
**kwargs		other keyword arguments to pass to the constructor for the Deployment class	{}

Source code in prefect/deployments.py

@classmethod
@sync_compatible
async def build_from_flow(
    cls,
    flow: Flow,
    name: str,
    output: str = None,
    skip_upload: bool = False,
    ignore_file: str = ".prefectignore",
    apply: bool = False,
    load_existing: bool = True,
    **kwargs,
) -> "Deployment":
    """
    Configure a deployment for a given flow.

    Args:
        flow: A flow function to deploy
        name: A name for the deployment
        output (optional): if provided, the full deployment specification will be written as a YAML
            file in the location specified by `output`
        skip_upload: if True, deployment files are not automatically uploaded to remote storage
        ignore_file: an optional path to a `.prefectignore` file that specifies filename patterns
            to ignore when uploading to remote storage; if not provided, looks for `.prefectignore`
            in the current working directory
        apply: if True, the deployment is automatically registered with the API
        load_existing: if True, load any settings that may already be configured for the named deployment
            server-side (e.g., schedules, default parameter values, etc.)
        **kwargs: other keyword arguments to pass to the constructor for the `Deployment` class
    """
    if not name:
        raise ValueError("A deployment name must be provided.")

    # note that `deployment.load` only updates settings that were *not*
    # provided at initialization
    deployment = cls(name=name, **kwargs)
    deployment.flow_name = flow.name
    if not deployment.entrypoint:
        ## first see if an entrypoint can be determined
        flow_file = getattr(flow, "__globals__", {}).get("__file__")
        mod_name = getattr(flow, "__module__", None)
        if not flow_file:
            if not mod_name:
                # todo, check if the file location was manually set already
                raise ValueError("Could not determine flow's file location.")
            module = importlib.import_module(mod_name)
            flow_file = getattr(module, "__file__", None)
            if not flow_file:
                raise ValueError("Could not determine flow's file location.")

        # set entrypoint
        entry_path = Path(flow_file).absolute().relative_to(Path(".").absolute())
        deployment.entrypoint = f"{entry_path}:{flow.fn.__name__}"

    if load_existing:
        await deployment.load()

    # set a few attributes for this flow object
    deployment.parameter_openapi_schema = parameter_schema(flow)

    if not deployment.version:
        deployment.version = flow.version
    if not deployment.description:
        deployment.description = flow.description

    # proxy for whether infra is docker-based
    is_docker_based = hasattr(deployment.infrastructure, "image")

    if not deployment.storage and not is_docker_based and not deployment.path:
        deployment.path = str(Path(".").absolute())
    elif not deployment.storage and is_docker_based:
        # only update if a path is not already set
        if not deployment.path:
            deployment.path = "/opt/prefect/flows"

    if not skip_upload:
        if (
            deployment.storage
            and "put-directory" in deployment.storage.get_block_capabilities()
        ):
            await deployment.upload_to_storage(ignore_file=ignore_file)

    if output:
        await deployment.to_yaml(output)

    if apply:
        await deployment.apply()

    return deployment

handle_openapi_schema

This method ensures setting a value of None is handled gracefully.

Source code in prefect/deployments.py

@validator("parameter_openapi_schema", pre=True)
def handle_openapi_schema(cls, value):
    """
    This method ensures setting a value of `None` is handled gracefully.
    """
    if value is None:
        return ParameterSchema()
    return value

load async

Queries the API for a deployment with this name for this flow, and if found, prepopulates any settings that were not set at initialization.

Returns a boolean specifying whether a load was successful or not.

Raises:

Type	Description
-ValueError	if both name and flow name are not set

Source code in prefect/deployments.py

@sync_compatible
async def load(self) -> bool:
    """
    Queries the API for a deployment with this name for this flow, and if found, prepopulates
    any settings that were not set at initialization.

    Returns a boolean specifying whether a load was successful or not.

    Raises:
        - ValueError: if both name and flow name are not set
    """
    if not self.name or not self.flow_name:
        raise ValueError("Both a deployment name and flow name must be provided.")
    async with get_client() as client:
        try:
            deployment = await client.read_deployment_by_name(
                f"{self.flow_name}/{self.name}"
            )
            if deployment.storage_document_id:
                storage = Block._from_block_document(
                    await client.read_block_document(deployment.storage_document_id)
                )

            excluded_fields = self.__fields_set__.union(
                {"infrastructure", "storage", "timestamp"}
            )
            for field in set(self.__fields__.keys()) - excluded_fields:
                new_value = getattr(deployment, field)
                setattr(self, field, new_value)

            if "infrastructure" not in self.__fields_set__:
                if deployment.infrastructure_document_id:
                    self.infrastructure = Block._from_block_document(
                        await client.read_block_document(
                            deployment.infrastructure_document_id
                        )
                    )
            if "storage" not in self.__fields_set__:
                if deployment.storage_document_id:
                    self.storage = Block._from_block_document(
                        await client.read_block_document(
                            deployment.storage_document_id
                        )
                    )
        except ObjectNotFound:
            return False
    return True

update async

Performs an in-place update with the provided settings.

Parameters:

Name	Type	Description	Default
ignore_none	bool	if True, all None values are ignored when performing the update	False

Source code in prefect/deployments.py

@sync_compatible
async def update(self, ignore_none: bool = False, **kwargs):
    """
    Performs an in-place update with the provided settings.

    Args:
        ignore_none: if True, all `None` values are ignored when performing the update
    """
    unknown_keys = set(kwargs.keys()) - set(self.dict().keys())
    if unknown_keys:
        raise ValueError(
            f"Received unexpected attributes: {', '.join(unknown_keys)}"
        )
    for key, value in kwargs.items():
        if ignore_none and value is None:
            continue
        setattr(self, key, value)

upload_to_storage async

Uploads the workflow this deployment represents using a provided storage block; if no block is provided, defaults to configuring self for local storage.

Parameters:

Name	Type	Description	Default
storage_block	str	a string reference a remote storage block slug $type/$name; if provided, used to upload the workflow's project	None
ignore_file	str	an optional path to a .prefectignore file that specifies filename patterns to ignore when uploading to remote storage; if not provided, looks for .prefectignore in the current working directory	'.prefectignore'

Source code in prefect/deployments.py

@sync_compatible
async def upload_to_storage(
    self, storage_block: str = None, ignore_file: str = ".prefectignore"
) -> Optional[int]:
    """
    Uploads the workflow this deployment represents using a provided storage block;
    if no block is provided, defaults to configuring self for local storage.

    Args:
        storage_block: a string reference a remote storage block slug `$type/$name`; if provided,
            used to upload the workflow's project
        ignore_file: an optional path to a `.prefectignore` file that specifies filename patterns
            to ignore when uploading to remote storage; if not provided, looks for `.prefectignore`
            in the current working directory
    """
    deployment_path = None
    file_count = None
    if storage_block:
        storage = await Block.load(storage_block)

        if "put-directory" not in storage.get_block_capabilities():
            raise BlockMissingCapabilities(
                f"Storage block {storage!r} missing 'put-directory' capability."
            )

        self.storage = storage

        # upload current directory to storage location
        file_count = await self.storage.put_directory(
            ignore_file=ignore_file, to_path=self.path
        )
    elif self.storage:
        if "put-directory" not in self.storage.get_block_capabilities():
            raise BlockMissingCapabilities(
                f"Storage block {self.storage!r} missing 'put-directory'"
                " capability."
            )

        file_count = await self.storage.put_directory(
            ignore_file=ignore_file, to_path=self.path
        )

    # persists storage now in case it contains secret values
    if self.storage and not self.storage._block_document_id:
        await self.storage._save(is_anonymous=True)

    return file_count

load_deployments_from_yaml

Load deployments from a yaml file.

Source code in prefect/deployments.py

def load_deployments_from_yaml(
    path: str,
) -> PrefectObjectRegistry:
    """
    Load deployments from a yaml file.
    """
    with open(path, "r") as f:
        contents = f.read()

    # Parse into a yaml tree to retrieve separate documents
    nodes = yaml.compose_all(contents)

    with PrefectObjectRegistry(capture_failures=True) as registry:
        for node in nodes:
            with tmpchdir(path):
                deployment_dict = yaml.safe_load(yaml.serialize(node))
                # The return value is not necessary, just instantiating the Deployment
                # is enough to get it recorded on the registry
                parse_obj_as(Deployment, deployment_dict)

    return registry

load_flow_from_flow_run async

Load a flow from the location/script provided in a deployment's storage document.

If ignore_storage=True is provided, no pull from remote storage occurs. This flag is largely for testing, and assumes the flow is already available locally.

Source code in prefect/deployments.py

@inject_client
async def load_flow_from_flow_run(
    flow_run: schemas.core.FlowRun, client: PrefectClient, ignore_storage: bool = False
) -> Flow:
    """
    Load a flow from the location/script provided in a deployment's storage document.

    If `ignore_storage=True` is provided, no pull from remote storage occurs.  This flag
    is largely for testing, and assumes the flow is already available locally.
    """
    deployment = await client.read_deployment(flow_run.deployment_id)
    logger = flow_run_logger(flow_run)

    if not ignore_storage:
        if deployment.storage_document_id:
            storage_document = await client.read_block_document(
                deployment.storage_document_id
            )
            storage_block = Block._from_block_document(storage_document)
        else:
            basepath = deployment.path or Path(deployment.manifest_path).parent
            storage_block = LocalFileSystem(basepath=basepath)

        sys.path.insert(0, ".")

        logger.info(f"Downloading flow code from storage at {deployment.path!r}")
        await storage_block.get_directory(from_path=deployment.path, local_path=".")

    import_path = relative_path_to_current_platform(deployment.entrypoint)
    logger.debug(f"Importing flow code from '{import_path}'")

    # for backwards compat
    if deployment.manifest_path:
        with open(deployment.manifest_path, "r") as f:
            import_path = json.load(f)["import_path"]
            import_path = (
                Path(deployment.manifest_path).parent / import_path
            ).absolute()
    flow = await run_sync_in_worker_thread(load_flow_from_entrypoint, str(import_path))
    return flow

run_deployment async

Create a flow run for a deployment and return it after completion or a timeout.

This function will return when the created flow run enters any terminal state or the timeout is reached. If the timeout is reached and the flow run has not reached a terminal state, it will still be returned. When using a timeout, we suggest checking the state of the flow run if completion is important moving forward.

Parameters:

Name	Type	Description	Default
name	str	The deployment name in the form: '/'	required
parameters	Optional[dict]	Parameter overrides for this flow run. Merged with the deployment defaults.	None
scheduled_time	Optional[datetime]	The time to schedule the flow run for, defaults to scheduling the flow run to start now.	None
flow_run_name	Optional[str]	A name for the created flow run	None
timeout	Optional[float]	The amount of time to wait for the flow run to complete before returning. Setting timeout to 0 will return the flow run immediately. Setting timeout to None will allow this function to poll indefinitely. Defaults to None	None
poll_interval	Optional[float]	The number of seconds between polls	5
tags	Optional[Iterable[str]]	A list of tags to associate with this flow run; note that tags are used only for organizational purposes.	None
idempotency_key	Optional[str]	A unique value to recognize retries of the same run, and prevent creating multiple flow runs.	None

Source code in prefect/deployments.py

@sync_compatible
@inject_client
async def run_deployment(
    name: str,
    client: Optional[PrefectClient] = None,
    parameters: Optional[dict] = None,
    scheduled_time: Optional[datetime] = None,
    flow_run_name: Optional[str] = None,
    timeout: Optional[float] = None,
    poll_interval: Optional[float] = 5,
    tags: Optional[Iterable[str]] = None,
    idempotency_key: Optional[str] = None,
):
    """
    Create a flow run for a deployment and return it after completion or a timeout.

    This function will return when the created flow run enters any terminal state or
    the timeout is reached. If the timeout is reached and the flow run has not reached
    a terminal state, it will still be returned. When using a timeout, we suggest
    checking the state of the flow run if completion is important moving forward.

    Args:
        name: The deployment name in the form: '<flow-name>/<deployment-name>'
        parameters: Parameter overrides for this flow run. Merged with the deployment
            defaults.
        scheduled_time: The time to schedule the flow run for, defaults to scheduling
            the flow run to start now.
        flow_run_name: A name for the created flow run
        timeout: The amount of time to wait for the flow run to complete before
            returning. Setting `timeout` to 0 will return the flow run immediately.
            Setting `timeout` to None will allow this function to poll indefinitely.
            Defaults to None
        poll_interval: The number of seconds between polls
        tags: A list of tags to associate with this flow run; note that tags are used only for organizational purposes.
        idempotency_key: A unique value to recognize retries of the same run, and prevent creating multiple flow runs.
    """
    if timeout is not None and timeout < 0:
        raise ValueError("`timeout` cannot be negative")

    if scheduled_time is None:
        scheduled_time = pendulum.now("UTC")

    parameters = parameters or {}

    deployment = await client.read_deployment_by_name(name)

    flow_run_ctx = FlowRunContext.get()
    if flow_run_ctx:
        # This was called from a flow. Link the flow run as a subflow.
        from prefect.engine import (
            Pending,
            _dynamic_key_for_task_run,
            collect_task_run_inputs,
        )

        task_inputs = {
            k: await collect_task_run_inputs(v) for k, v in parameters.items()
        }

        # Generate a task in the parent flow run to represent the result of the subflow
        dummy_task = Task(
            name=name,
            fn=lambda: None,
            version=deployment.version,
        )
        # Override the default task key to include the deployment name
        dummy_task.task_key = f"{__name__}.run_deployment.{slugify(name)}"
        parent_task_run = await client.create_task_run(
            task=dummy_task,
            flow_run_id=flow_run_ctx.flow_run.id,
            dynamic_key=_dynamic_key_for_task_run(flow_run_ctx, dummy_task),
            task_inputs=task_inputs,
            state=Pending(),
        )
        parent_task_run_id = parent_task_run.id
    else:
        parent_task_run_id = None

    flow_run = await client.create_flow_run_from_deployment(
        deployment.id,
        parameters=parameters,
        state=Scheduled(scheduled_time=scheduled_time),
        name=flow_run_name,
        tags=tags,
        idempotency_key=idempotency_key,
        parent_task_run_id=parent_task_run_id,
    )

    flow_run_id = flow_run.id

    if timeout == 0:
        return flow_run

    with anyio.move_on_after(timeout):
        while True:
            flow_run = await client.read_flow_run(flow_run_id)
            flow_state = flow_run.state
            if flow_state and flow_state.is_final():
                return flow_run
            await anyio.sleep(poll_interval)

    return flow_run