| 20 | |
| 21 | return new ReadableStream({ |
| 22 | async start(controller) { |
| 23 | try { |
| 24 | for await (const event of bedrockStream) { |
| 25 | if (event.contentBlockDelta?.delta?.text) { |
| 26 | const text = event.contentBlockDelta.delta.text |
| 27 | fullContent += text |
| 28 | controller.enqueue(new TextEncoder().encode(text)) |
| 29 | } else if (event.metadata?.usage) { |
| 30 | inputTokens = event.metadata.usage.inputTokens ?? 0 |
| 31 | outputTokens = event.metadata.usage.outputTokens ?? 0 |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | if (onComplete) { |
| 36 | onComplete(fullContent, { inputTokens, outputTokens }) |
| 37 | } |
| 38 | |
| 39 | controller.close() |
| 40 | } catch (err) { |
| 41 | controller.error(err) |
| 42 | } |
| 43 | }, |
| 44 | }) |
| 45 | } |
| 46 | |