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Copy pathutils.ts
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201 lines (174 loc) · 6.77 KB
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import { createLogger } from '@/lib/logs/console/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,
selectedOutputIds: string[],
responseFormat?: any
): ReadableStream {
// Check if this block has response format selected outputs
const hasResponseFormatSelection = selectedOutputIds.some((outputId) => {
const blockIdForOutput = outputId.includes('_')
? outputId.split('_')[0]
: outputId.split('.')[0]
return blockIdForOutput === blockId && outputId.includes('_')
})
// If no response format selection, return original stream unchanged
if (!hasResponseFormatSelection || !responseFormat) {
return originalStream
}
// Get the selected field names for this block
const selectedFields = selectedOutputIds
.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 // Track if we've already processed the complete JSON
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) {
// Handle any remaining buffer at the end only if we haven't processed complete JSON yet
if (buffer.trim() && !hasProcessedComplete) {
self.processCompleteJson(buffer, selectedFields, controller)
}
controller.close()
break
}
const chunk = decoder.decode(value, { stream: true })
buffer += chunk
// Try to process the current buffer only if we haven't processed complete JSON yet
if (!hasProcessedComplete) {
const processedChunk = self.processStreamingChunk(buffer, selectedFields)
if (processedChunk) {
controller.enqueue(new TextEncoder().encode(processedChunk))
hasProcessedComplete = true // Mark as processed to prevent duplicate processing
}
}
}
} 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 {
// For streaming response format, we need to parse the JSON as it comes in
// and extract only the field values we care about
// Try to parse as complete JSON first
try {
const parsed = JSON.parse(buffer.trim())
if (typeof parsed === 'object' && parsed !== null) {
// We have a complete JSON object, extract the selected fields
// Process all selected fields and format them properly
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) {
// Join multiple fields with newlines for readability
const result = results.join('\n')
return result
}
return null
}
} catch (e) {
// Not complete JSON yet, continue buffering
}
// For real-time extraction during streaming, we'd need more sophisticated parsing
// For now, let's handle the case where we receive chunks that might be partial JSON
// Simple heuristic: if buffer contains what looks like a complete JSON object
const openBraces = (buffer.match(/\{/g) || []).length
const closeBraces = (buffer.match(/\}/g) || []).length
if (openBraces > 0 && openBraces === closeBraces) {
// Likely a complete JSON object
try {
const parsed = JSON.parse(buffer.trim())
if (typeof parsed === 'object' && parsed !== null) {
// Process all selected fields and format them properly
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) {
// Join multiple fields with newlines for readability
const result = results.join('\n')
return result
}
return null
}
} catch (e) {
// Still not valid JSON, continue
}
}
return null
}
private processCompleteJson(
buffer: string,
selectedFields: string[],
controller: ReadableStreamDefaultController
): void {
try {
const parsed = JSON.parse(buffer.trim())
if (typeof parsed === 'object' && parsed !== null) {
// Process all selected fields and format them properly
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) {
// Join multiple fields with newlines for readability
const result = results.join('\n')
controller.enqueue(new TextEncoder().encode(result))
}
}
} catch (error) {
logger.warn('Failed to parse complete JSON in streaming processor:', { error })
}
}
}
// Create singleton instance
export const streamingResponseFormatProcessor = new StreamingResponseFormatProcessor()