GetCursor - Simple Log Service

Retrieves a cursor based on a specified time.

Operation description

Description

The host consists of a project name and a Simple Log Service endpoint. You must specify the project name in the host.
The relationship among a cursor, a project, a Logstore, and a shard is as follows:
- A project contains multiple Logstores.
- Each Logstore contains multiple shards.
- A cursor indicates the position of a specific log.

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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

log:GetCursorOrData

get

*LogStore

acs:log:{#regionId}:{#accountId}:project/{#ProjectName}/logstore/{#LogstoreName}

log:TLSVersion

None

Request syntax

GET /logstores/{logstore}/shards/{shardId}?type=cursor HTTP/1.1

Path Parameters

Parameter	Type	Required	Description	Example
logstore	string	Yes	The logstore name.	sls-test-logstore
shardId	integer	Yes	The shard ID.	1

Request parameters

Parameter	Type	Required	Description	Example
project	string	Yes	The project name.	ali-test-project
from	string	Yes	A point in time. This can be a UNIX timestamp or the string `begin` or `end`.	begin

You can use the from parameter to locate logs within the lifecycle of a shard. If the lifecycle of the Logstore is [begin_time,end_time) and the from parameter is set to from_time, the behavior is as follows:

If from_time is less than or equal to begin_time, or if from_time is set to 'begin', the cursor for the position at begin_time is returned.
If from_time is greater than or equal to end_time, or if from_time is set to 'end', the cursor for the position where the next log will be written is returned. No data exists at this cursor position.
If from_time is greater than begin_time and less than end_time, the cursor for the first data packet whose server reception time is greater than or equal to from_time is returned.

Note

The lifecycle of a Logstore is specified by the TTL field in its properties. For example, if the current time is 2018-11-11 09:00:00 and the TTL is 5, the time range of data that can be consumed in each shard is [2018-11-05 09:00:00,2018-11-11 09:00:00). This time refers to the server time. For more information, see Data retention period.

Response elements

Element	Type	Description	Example
	object	The cursor value.
cursor	string	The cursor value.	MTQ0NzI5OTYwNjg5NjYzMjM1Ng==

Examples

Success response

JSON format

{
  "cursor": "MTQ0NzI5OTYwNjg5NjYzMjM1Ng=="
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.