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Copy pathutils.ts
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175 lines (150 loc) · 5.23 KB
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import { createLogger } from '@sim/logger'
import type { ResponseFormatStreamProcessor } from '@/executor/types'
const logger = createLogger('ExecutorUtils')
/**
* Processes a streaming response to extract only the selected response format fields
* instead of streaming the full JSON wrapper.
*/
export class StreamingResponseFormatProcessor implements ResponseFormatStreamProcessor {
processStream(
originalStream: ReadableStream,
blockId: string,
selectedOutputs: string[],
responseFormat?: any
): ReadableStream {
const hasResponseFormatSelection = selectedOutputs.some((outputId) => {
const blockIdForOutput = outputId.includes('_')
? outputId.split('_')[0]
: outputId.split('.')[0]
return blockIdForOutput === blockId && outputId.includes('_')
})
if (!hasResponseFormatSelection || !responseFormat) {
return originalStream
}
const selectedFields = selectedOutputs
.filter((outputId) => {
const blockIdForOutput = outputId.includes('_')
? outputId.split('_')[0]
: outputId.split('.')[0]
return blockIdForOutput === blockId && outputId.includes('_')
})
.map((outputId) => outputId.substring(blockId.length + 1))
logger.info('Processing streaming response format', {
blockId,
selectedFields,
hasResponseFormat: !!responseFormat,
selectedFieldsCount: selectedFields.length,
})
return this.createProcessedStream(originalStream, selectedFields, blockId)
}
private createProcessedStream(
originalStream: ReadableStream,
selectedFields: string[],
blockId: string
): ReadableStream {
let buffer = ''
let hasProcessedComplete = false
const self = this
return new ReadableStream({
async start(controller) {
const reader = originalStream.getReader()
const decoder = new TextDecoder()
try {
while (true) {
const { done, value } = await reader.read()
if (done) {
if (buffer.trim() && !hasProcessedComplete) {
self.processCompleteJson(buffer, selectedFields, controller)
}
controller.close()
break
}
const chunk = decoder.decode(value, { stream: true })
buffer += chunk
if (!hasProcessedComplete) {
const processedChunk = self.processStreamingChunk(buffer, selectedFields)
if (processedChunk) {
controller.enqueue(new TextEncoder().encode(processedChunk))
hasProcessedComplete = true
}
}
}
} catch (error) {
logger.error('Error processing streaming response format:', { error, blockId })
controller.error(error)
} finally {
reader.releaseLock()
}
},
})
}
private processStreamingChunk(buffer: string, selectedFields: string[]): string | null {
try {
const parsed = JSON.parse(buffer.trim())
if (typeof parsed === 'object' && parsed !== null) {
const results: string[] = []
for (const field of selectedFields) {
if (field in parsed) {
const value = parsed[field]
const formattedValue = typeof value === 'string' ? value : JSON.stringify(value)
results.push(formattedValue)
}
}
if (results.length > 0) {
const result = results.join('\n')
return result
}
return null
}
} catch (e) {}
const openBraces = (buffer.match(/\{/g) || []).length
const closeBraces = (buffer.match(/\}/g) || []).length
if (openBraces > 0 && openBraces === closeBraces) {
try {
const parsed = JSON.parse(buffer.trim())
if (typeof parsed === 'object' && parsed !== null) {
const results: string[] = []
for (const field of selectedFields) {
if (field in parsed) {
const value = parsed[field]
const formattedValue = typeof value === 'string' ? value : JSON.stringify(value)
results.push(formattedValue)
}
}
if (results.length > 0) {
const result = results.join('\n')
return result
}
return null
}
} catch (e) {}
}
return null
}
private processCompleteJson(
buffer: string,
selectedFields: string[],
controller: ReadableStreamDefaultController
): void {
try {
const parsed = JSON.parse(buffer.trim())
if (typeof parsed === 'object' && parsed !== null) {
const results: string[] = []
for (const field of selectedFields) {
if (field in parsed) {
const value = parsed[field]
const formattedValue = typeof value === 'string' ? value : JSON.stringify(value)
results.push(formattedValue)
}
}
if (results.length > 0) {
const result = results.join('\n')
controller.enqueue(new TextEncoder().encode(result))
}
}
} catch (error) {
logger.warn('Failed to parse complete JSON in streaming processor:', { error })
}
}
}
export const streamingResponseFormatProcessor = new StreamingResponseFormatProcessor()