DescribeFlow - CloudFlow - Alibaba Cloud Documentation Center

Retrieves information about a flow.

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Test

RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.
API: The API that you can call to perform the action.
Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.
Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.
- For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.
- For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.
Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.
Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

fnf:DescribeFlow

get

*All Resource

*

None

Request parameters

Parameter	Type	Required	Description	Example
Name	string	Yes	The name of the flow.	my_flow_name
FlowVersion	string	No	The version of the flow.	1

Response elements

Element	Type	Description	Example
	object	The returned data.
Type	string	The type of the flow.	FDL
Definition	string	The definition of the flow. It follows the Flow Definition Language (FDL) syntax standard. For forward compatibility, the system supports two versions of the flow definition specification.	旧版： " type: flow version: v1 name: my_flow_name steps: - type: pass name: mypass " 新版： " Type: StateMachine SpecVersion: v1 Name: my_flow_name StartAt: my_state States: - Type: Pass Name: my_state End: true "
RoleArn	string	The resource descriptor of the authorization role that the flow execution requires. Serverless Workflow assumes this role to operate on the related resources during the execution.	acs:ram:${region}:${accountID}:${role}
RequestId	string	The request ID.	testRequestId
Description	string	The description of the flow.	my test flow
Name	string	The name of the flow.	my_flow_name
CreatedTime	string	The time when the flow was created.	2019-01-01T01:01:01.001Z
LastModifiedTime	string	The time when the flow was last modified.	2019-01-01T01:01:01.001Z
Id	string	The unique ID of the flow.	e589e092-e2c0-4dee-b306-3574ddfdddf5****
ExecutionMode	string	The execution mode. This is an enumeration. Valid values are Express and Standard. An empty string is equivalent to Standard.	Standard
Environment	object	The list of variables that can be accessed during the flow execution.
Variables	array<object>	The list of variables that can be accessed during the flow execution.
	object	The list of variables that can be accessed during the flow execution.
Name	string	The name of the variable.	key
Value	string	The value of the variable.	value
Description	string	The description of the variable.	description

Examples

Success response

JSON format

{
  "Type": "FDL",
  "Definition": "旧版：\n\"\ntype: flow\nversion: v1\nname: my_flow_name\nsteps:\n  - type: pass\n    name: mypass\n\"\n\n新版：\n\"\nType: StateMachine\nSpecVersion: v1\nName: my_flow_name\nStartAt: my_state\nStates:\n  - Type: Pass\n    Name: my_state\n    End: true\n\"",
  "RoleArn": "acs:ram:${region}:${accountID}:${role}",
  "RequestId": "testRequestId",
  "Description": "my test flow",
  "Name": "my_flow_name",
  "CreatedTime": "2019-01-01T01:01:01.001Z",
  "LastModifiedTime": "2019-01-01T01:01:01.001Z",
  "Id": "e589e092-e2c0-4dee-b306-3574ddfdddf5****",
  "ExecutionMode": "Standard",
  "Environment": {
    "Variables": [
      {
        "Name": "key",
        "Value": "value",
        "Description": "description"
      }
    ]
  }
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.

HTTP status code	Error code	Error message	Description
400	ActionNotSupported	The requested API operation '%s' is incorrect. Please check.
400	APIVersionNotSupported	The requested API version '%s' is not supported yet. Please check.
400	EntityTooLarge	The payload size exceeds maximum allowed size (%s bytes).	The payload size exceeds maximum allowed size (%s bytes).
400	InvalidArgument	Parameter error.	Parameter error.
400	MissingRequiredHeader	The HTTP header '%s' must be specified.	The HTTP header '%s' must be specified.
400	MissingRequiredParams	The HTTP query '%s' must be specified.	The HTTP query '%s' must be specified.
412	PreconditionFailed	The resource to be modified has been changed.	The resource to be modified has been changed. Please try again later.
500	InternalServerError	An internal error has occurred. Please retry.	An internal error has occurred. Please retry.
403	AccessDenied	The resources doesn't belong to you.
403	InvalidAccessKeyID	The AccessKey ID %s is invalid.	The AccessKey ID %s is invalid.
403	RequestTimeTooSkewed	The difference between the request time %s and the current time %s is too large.	The difference between the request time %s and the current time %s is too large.
403	SignatureNotMatch	The request signature we calculated does not match the signature you provided. Check your access key and signing method.	The calculated signature of the request does not match the signature you provided. Check your AccessKey Secret and signing algorithm.
404	FlowNotExists	Flow %s does not exist.	Flow %s does not exist.
415	UnsupportedMediaType	The content type must be "application/json".	The content type must be "application/json".
429	ResourceThrottled	The request is throttled. Please try again later.	The request is throttled. Please try again later.