How to trigger an Integration from Apigee X? Apigee X includes an IntegrationCallout step (aka policy) that allows you to call out to API Integration.
If I were using Apigee to facilitate a simple file upload to Google Cloud Storage (GCS), I would:
- Create a "loopback" API in Apigee X that validates credentials (oauth token or API key), and then generates a "signed URL" which allows time-limited access to GCS for upload. Call t his the "pre upload" API.
- Have the client call that preupload API. In response it receives a unique signed URL that points to storage.googleapis.com
- The client will then upload directly to GCS using that specific URL.
- At that point if there is a need to process the file further, then:
- configure your cloud storage bucket to issue a pubsub event on file upload (documentation)
- configure App Integration with a pubsub trigger (documentation)
The last step there allows you to kick off any integration you would need on the uploaded file.
If there is a need to correlate the uploaded file with something else associated to the client, you can do that by using a specific folder within the GCS bucket, and allow the intiial Apigee API to place any additional data into that folder, as appropriate. If you do this, there's a chance that Apigee will issue a signed URL, but the client will fail to use it (won't upload, for some reason). In which case, you would need a scheduled task to look for "stale" upload metadata, and clean it out once per day, or week, or whatever. That can be done with Cloud Scheduler.
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