feat: support bi-directional transcribe streaming over Websocket #1216
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fix: uuid not available in rn
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Now this package can fully serialize & deserailize eventstream with web APIs. In browsers, it converts from user-side iterables of input structure to internal ReadableStream of binaries. In ReactNative, it converts from user-side iterables of input structure to internal iterables of binaries. The same applies to the other converting direction.
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Co-authored-by: Trivikram Kamat <16024985+trivikr@users.noreply.github.com>
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Add customizations for Transcribe Streaming client to support bi-directional streaming in browsers over websocket. The client is compatible with ReactNative too. But currently there's no viable solution to access void record in chunks.
The customizations are in the
@aws-sdk/middleware-sdk-transcribe-streamingpackage. They are crafted according to 'Using Amazon Transcribe Streaming with WebSockets'. The customizations are as below:middleware-endpoint: convert original http endpoint to Websocket endpint. Supplying custome endpoints for TranscribeStreaming in browser may lead to unknow behaviormiddleware-session-id: inject defaultsession-idparameter in the request. Because websocket handler doesn't expose the request ID header from the response, we usesession-idto map request to server-side logs. This middleware also inject other non-streaming response parameters likeLanguageCode,MediaEncodeing,MediaSampleRateHertz, so that the SDK behavior is consistent in NodeJS runtime.signer: SigV4-based signer used to sign websocket request. It signs the request by presigning the requestwebsocket-handler: An Websocket handler wrapped in aRequestHandlerinterface. The request's payload can beReadableStreamorAsyncIterable. The response from it has payload inAsyncIterable. But ifReadableStreamconstructor is available in the environment, the response payload is prefered inReadableStream. This is for interface consistency across the browsers. If any error thrown from input stream, the handler will close the WebSocket connection and throw error from response payload stream.TODO: Create a ReactNative library that emits recorder binary chunks so that RN users can supply recorder data to WebSocket API.
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