Code Node Creation Flow

Open

Code Node creation process :

1. While creating a node on the workspace :

   1. Select Code APP and javascript API.

   2. In the Code field, enter your JavaScript code.

   3. You can also define data fields to be provided to the code as strings with the Input Data fields. 

   4. Click continue.
      API: https://{{workspace}}.myeshopbox.com/api/v1/node

2. Generate a service account token. Eshopbox platform uses App Engine client library to generate an access token for the service account.
   Ref: https://cloud.google.com/docs/authentication/production#manually

   static void authExplicit(String jsonPath) throws IOException { // You can specify a credential file by providing a path to GoogleCredentials. // Otherwise credentials are read from the GOOGLE_APPLICATION_CREDENTIALS environment variable. GoogleCredentials credentials = GoogleCredentials.fromStream(new FileInputStream(jsonPath)) .createScoped(Lists.newArrayList("https://www.googleapis.com/auth/cloud-platform")); Storage storage = StorageOptions.newBuilder().setCredentials(credentials).build().getService(); System.out.println("Buckets:"); Page<Bucket> buckets = storage.list(); for (Bucket bucket : buckets.iterateAll()) { System.out.println(bucket.toString()); } }

3. Service account token is received from the above function.

4. Source code is uploaded in js file on cloud storage by hitting the following API using the above access token.
   Url to upload file: https://storage.googleapis.com/upload/storage/v1/b/{bucketName}/o?uploadType=media&name={filename}
   Ref: https://cloud.google.com/storage/docs/uploading-objects#rest-upload-objects

5. The file upload response is returned.

6. On successful response, push node metadata into the queue.

   1. NodeId

   2. Bucket name

   3. Filename

   4. File path

7. Return the above response to the Workspace.

8. On the other of the queue, Eshopbox creates an archived file of the javascript source code using App Engine client library for Cloud Storage.

   GcsService gcsService = GcsServiceFactory.createGcsService(); GcsOutputChannel gcsOutputChannel = gcsService.createOrReplace(new GcsFilename("{bucketName}", "{zipFileName}"), new GcsFileOptions.Builder().build()); ZipOutputStream outputStream = new ZipOutputStream(Channels.newOutputStream(gcsOutputChannel)); GcsInputChannel inputChannel = gcsService .openReadChannel(new GcsFilename("{sourceBucketName}", "index.js"), 0); InputStream inStream = Channels.newInputStream(inputChannel); ZipEntry zipEntry = new ZipEntry("index.js"); outputStream.putNextEntry(zipEntry); byte[] bytes = new byte[1024]; int length; while((length = inStream.read(bytes)) >= 0) { outputStream.write(bytes, 0, length); }

9. Then, create a cloud function using Service Account token, pass function names in the body along with other details
   POST https://cloudfunctions.googleapis.com/v1/{location}/functions
   Ref link: https://cloud.google.com/functions/docs/reference/rest/v1/projects.locations.functions#CloudFunction

10. To invoke the created cloud function, generate a token to authorize the function invoke request:
    GET http://metadata/computeMetadata/v1/instance/service-accounts/default/identity?audience=https://{REGION}-{PROJECT_ID}.cloudfunctions.net/{FUNCTION_NAME}
    Ref link: https://cloud.google.com/functions/docs/calling/http

11. If successful, the response includes a 200 status code with access token.

12. Invoke the cloud function using this access token on the following URL:
    POST https://{REGION}-{PROJECT_ID}.cloudfunctions.net/{FUNCTION_NAME}
    Add the input fields to the body as mentioned while creating node.