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    Dokumentasi

    Using API to Decompress GZIP Files

    Terakhir diperbarui:2024-01-06 15:35:15

      Prerequisites

      1. The GZIP decompression feature is implemented via the Serverless Cloud Function (SCF) service. Before use, you need to create a GZIP Decompression function in the COS console. For detailed directions on how to create a function, see Using Console to Configure Auto GZIP File Decompression.
      2. After creating the function, click Instructions on the right of the function to configure it. The configuration items are a JSON string, which will be as described in detail in this document.
      If your function needs SCF authentication, you need to call the Invoke API provided by SCF to run your cloud function, where the ClientContext parameter is passed in JSON format (see Sample Function Parameter Configuration for details).
      If you configure the function to be authentication free, you can directly send HTTP requests to the corresponding API gateway to call the function.

      Sample Function Parameter Configuration

      Note:
      In actual practice, delete the comments in the code.
      {
          "bucket": "examplebucket-1250000000",    // Source bucket storing the GZIP package
          "region": "ap-guangzhou",         // Region where the source bucket storing the GZIP package resides
          "key": "example.txt.gz",              //  GZIP package name
          "targetBucket": "examplebucket-1250000000",    // Destination bucket to store the decompressed objects
          "targetRegion": "ap-guangzhou",         // Region where the destination bucket resides
          "targetPrefix": "target/",              // Prefix of the directory to store the decompressed objects
      }
      The parameters are as described below:
      Parameter
      Description
      Type
      Required
      bucket
      Source bucket storing the GZIP package in the format of BucketName-APPID, such as examplebucket-1250000000.
      String
      Yes
      region
      Region of the source bucket storing the GZIP package. For the enumerated values, see Regions and Access Endpoints.
      String
      Yes
      key
      GZIP package name (object name), which is the unique identifier of the object in the bucket. For more information, see Object Overview.
      String
      Yes
      targetBucket
      Destination bucket to store the decompressed objects in the format of BucketName-APPID, such as examplebucket-1250000000.
      String
      Yes
      targetRegion
      Destination bucket region. For the enumerated values, see Regions and Access Endpoints.
      String
      Yes
      targetPrefix
      Prefix of the directory to store the decompressed objects. End a specified directory with a slash for saving to this directory, or keep it empty for saving to the root directory.
      String
      No

      Sample Function Response

      {
          "code": 0,
          "message": "cos gunzip file success",
          "data": {
              "Bucket": "examplebucket-1250000000",
              "Region": "ap-guangzhou"
          }
      }
      Response parameters are as described below:
      Parameter
      Description
      Type
      code
      Business error code. 0: The execution is successful. Other values: Execution failed.
      Number
      message
      Text description of the execution result. The message may be null.
      String
      data
      Information of successful execution. If the execution is successful, it contains information of the destination bucket.
      Object
      error
      Execution failure information. If the execution is successful, this parameter is null.
      Object or String

      Use Cases

      Use case 1: Decompressing a *.gz file

      Parameter configuration

      {
        "bucket": "examplebucket-1250000000",
        "region": "ap-guangzhou",
        "key": "example.txt.gz",
        "targetBucket": "examplebucket-1250000000",
        "targetRegion": "ap-guangzhou",
        "targetPrefix": "target/"
      }

      Location of decompressed objects

      target/example.txt

      Use case 2: Decompressing *.tar.gz and *.tgz files

      Parameter configuration

      {
        "bucket": "examplebucket-1250000000",
        "region": "ap-guangzhou",
        "key": "example.tar.gz",
        "targetBucket": "examplebucket-1250000000",
        "targetRegion": "ap-guangzhou",
        "targetPrefix": "target/"
      }

      Compressed package structure

      example.tar.gz
          ├── example-subfile-1.txt
          ├── example-subfile-2.png
          └── example-subfile-3.mp4

      Location of decompressed objects

      target/example-subfile-1.txt
      target/example-subfile-2.png
      target/example-subfile-3.mp4
      
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