How Do I Parse CSV/Excel Files in an OBS Bucket?

Description

How can I parse data from CSV or Excel files stored in an OBS bucket while developing applications in Huawei Cloud Astro Zero? For example, if an Excel file with a supplier list is uploaded to the OBS bucket, how do I extract and use that data in Huawei Cloud Astro Zero?

Figure 1 Supplier list

Solution

1. Connect the OBS bucket to Huawei Cloud Astro Zero by referring to Interconnecting with OBS Instances.
2. Use a script to obtain and parse an Excel file. That is, call the OBS connector to obtain the Excel file and call the Excel API to parse the Excel file content.
   1. In the navigation pane, choose Logic and click + next to Script.
   2. Enter a script name (for example, ScriptTest) to create a blank script.
   3. On the script editor, paste the following code to the code editing area.

      import * as excel from 'excel';
      import * as objectstorage from 'objectstorage';
      let ObsCli = objectstorage.newClient(objectstorage.StoreType.OBS, "Namespace__obs", "test"); // Connector name+Bucket name
      let data = ObsCli.getObject("Supplier list.xlsx");//File name
      let x = excel.decodeAll(data);
      console.log(x);

      Namespace__obs, test, and Supplier list.xlsx are the connector name, OBS bucket name, and Excel file name to be parsed in the bucket, respectively, which are set when you create an OBS connector in 1.

   4. Click in the upper part of the page to save the script.
   5. After the script is saved, click on the top of the editor page to execute the script.
   6. Click in the upper right corner of the test window at the bottom of the page to return the message headers.

      On the log tab page, you can view that the content has been parsed.

      0814 09:25:43.931|debug|vm[1]>>> Build #AppCube Core 25.7.0 amd64
      Built on 2025-08-07 19:44:28 
      Commit #d7cfcf8bbe
      0814 09:25:43.933|debug|vm[1]>>> node: 11
      0814 09:25:43.934|debug|vm[1]>>> js version: 2.0
      0814 09:25:43.935|debug|vm[1]>>> log level: debug
      0814 09:25:43.936|debug|vm[1]>>> script: Namespace__ScriptTest__1.0.1
      0814 09:25:43.936|debug|vm[1]>>> locale: en_US
      0814 09:25:43.937|debug|vm[1]>>> os timezone: Local
      0814 09:25:43.938|debug|vm[1]>>> user timezone: Local
      0814 09:25:43.939|debug|vm[1]>>> organization timezone: (GMT+08:00) China Standard Time (Asia/Shanghai)
      0814 09:25:44.158|debug|vm[1]>>> 
       { 
          Supplier list: [[["Company name", "Company type", "Date of Incorporation", "Procurement Specialist", "Assessment status", "Supplier level"], ["Company A", "Foreign-funded", "1964-01-01", "Mr. He", "Assessing", "gold medal"], ["Company B", "Listed", "1968-07-18", "Mr. Guo", "Assessment completed", "gold medal"], ["Company C", "Joint-stock", "2006-08-22", "Ms. Mao", "Assessment started", "gold medal"], ["Company D", "Listed", "1984-01-01", "Mr. Li", "Assessing", "gold medal"], ["Company E", "Joint-stock", "1995-01-01", "Ms. Zhao", "Assessment completed", "gold medal"], ["Company F", "Joint-stock", "1995-03-21", "Ms. Zhao", "Assessment completed", "gold medal"], ["Company G", "Joint-stock", "1993-03-01", "Ms. Wang", "Assessment completed", "excellent"], ["Company H", "Taiwan-funded private", "1974-02-20", "Mr. Wu", "Assessment started", "gold medal"], ["Company I", "Joint-stock", "1995-04-03", "Ms. Yang", "Assessment completed", "gold medal"], ["Company G", "Listed", "1996-01-01", "Ms. Li", "Assessing", "Best"]],
          Import rule description and example: [["Single-choice user," "Date and time," "Date," "Multiple-choice," "Single-choice," "Phone number," "URL," "Email address," "Percentage," "Amount," "Value," "Multi-line text," "Single-line text," "Form field type"], ["a00123456", "2000-01-01 12:00:00", "2000-01-01", "Option 1, Option 2, Option 3," "Option 1", "1333**333", "https://example.com", "example@***.com", "50%", "100", "100.123456789", "Multi-line text,multi-line text,multi-line text example," "Single-line text example," "Format specification example"], ["Enter the W3 account (with letters)," "," "Use different values in this column as multiple options. Use commas (,) to separate different options.", "Use different values in this column as a single option.", "Enter the mobile phone number of the Chinese mainland.", "Enter the standard URL format.", "Enter the standard email address format.", "Enter the percentage symbol.", "", "", "", "Format description"]]
       }  (AppTestSpace__test1:8) 
      0814 09:25:44.159|debug|vm[1]>>> vm memory usage --  malloc limit: 67108864, peek allocated: 284224
      NAME                                        COUNT             SIZE
      memory allocated                             1998           175264  (87.7 per block)
      memory used                                  2103           139182  (8 overhead, 17.2 average slack)
      atoms                                         862            32512  (37.7 per atom)
      strings                                         4               79  (19.8 per string)
      objects                                       350            25200  (72.0 per object)
        properties                                 1538            26912  (4.4 per object)
        shapes                                       78            18152  (232.7 per shape)
      bytecode functions                            129            23054
        bytecode                                    129             6321  (49.0 per function)
        pc2line                                     116              504  (4.3 per function)
      C functions                                   151
      arrays                                          3
        fast arrays                                   3
        elements                                      0                0  (0.0 per fast array)
      binary objects                                  4            16564
      0814 09:25:44.160|debug|vm[1]>>> sys resource usage
      NAME                                        LIMIT             SIZE
      RequestSOQLQueriesAmount                      100                0
      RequestSOQLRowsAmount                      100000                0
      RequestSOSLQueriesAmount                       20                0
      RequestSOSLRowsAmount                       50000                0
      RequestDMLStatementsAmount                    150                0
      RequestDMLRowsAmount                        10000                0
      RequestCallOutsAmount                          10                0
      RequestEmailSendsAmount                        10                0
      RequestEventSendsAmount                        50                0
      0814 09:25:44.161|info|vm[1]>>> release vm[1], last file: Namespace__ScriptTest, elapse time 230.752169ms, load module time 96.149µs, read file time 1.65µs
      load module metrics:
      module name         read file time      run code time       sum load time       tree child modules  
      -----------------   -----------------   -----------------   -----------------   -----------------   
      excel           910ns           39.769µs        40.679µs        []          
      objectstorage       740ns           54.73µs         55.47µs         []          

   7. After the script test is complete, click in the upper part of the editor to activate the script.