jaketf opened a new pull request #11151: Hl7v2 io
URL: https://github.com/apache/beam/pull/11151
 
 
   Add HL7v2IO connector for the Google Cloud Healthcare API.
   Initial work for these connectors is being prioritized based to support 
various 
   customer use cases for HL7v2 -> FHIR ETL pipelines.
   
   Healthcare clients are extremely concerned with not losing data in their 
pipelines and want dead letter queues for these sources / sinks.
   
   With this in mind the `HL7v2IO.Read` is designed as a mini pipeline that:
     - Starts with an arbitrary `PTransform` to populate a `PCollection` of 
message IDs. This was chosen to give flexibility between reading the HL7v2 
pubsub notifications, reading an entire HL7v2 store (with optional filter) or 
using some other method (e.g. a hand prepared subset of message IDs uploaded to 
GCS and read w/ TextIO). In the future we can gain efficiency here when the 
Healthcare API exposes a batch read method where we can batch up requests 
rather than making a separate call per element.
     - Then a DoFn that attempts to fetch the actual message contents from the 
HL7v2 store. Successfully fetched messages will be written to 
`HL7v2IO.Read.OUT` tag and Failures will be written to a 
`HLv2IO.Read.DEAD_LETTER` tag. The "expected" failure case would be attempting 
to fetch a message ID that doesn't exist.
   
   Similarly, the `HL7v2IO.Write` is designed as a mini pipeline that 
     - starts with a `PTransform` that attempts to ingest a `PCollection` of 
`Messages`
     - then applies the `this.getDeadLetterPTransform()` to the `PCollection` 
of messages that failed to ingest. This gives the customer the ability to 
capture dead letters in a system of their chosing (e.g. gcs, bq, pubsub) based 
on their needs.
   
   - [HL7v2](https://cloud.google.com/healthcare/docs/how-tos/hl7v2-messages):
     - Unbounded Read: Uses PubsubIO to read [notification 
subscription](https://cloud.google.com/healthcare/docs/how-tos/pubsub#hl7v2_messages)
     - Bounded Read: DoFn to get message IDs using the 
[Messages.List](https://cloud.google.com/healthcare/docs/reference/rest/v1beta1/projects.locations.datasets.hl7V2Stores.messages/list)
 REST API method
   
   Future Work will include a very similar IO transform for FHIR store:
   - [FhirIO](https://cloud.google.com/healthcare/docs/how-tos/fhir-bundles)
     - Write use the 
[executeBundle](https://cloud.google.com/healthcare/docs/reference/rest/v1beta1/projects.locations.datasets.fhirStores.fhir/executeBundle)
 REST API method to execute transactions on the FHIR Store
     - Read with 
[read](https://cloud.google.com/healthcare/docs/reference/rest/v1beta1/projects.locations.datasets.fhirStores.fhir/read)
 / 
[search](https://cloud.google.com/healthcare/docs/reference/rest/v1beta1/projects.locations.datasets.fhirStores.fhir/search)
 / from [notification 
subscription](https://cloud.google.com/healthcare/docs/how-tos/pubsub#fhir_resources)
   ------------------------
   
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