@plust/datasleuth
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Build LLM-powered research pipelines and output structured data.
361 lines • 16.1 kB
JavaScript
/**
* Parallel execution of multiple research tracks
* Enables concurrent research paths for more efficient deep research
*/
import { createStep } from '../utils/steps.js';
import { ValidationError, ConfigurationError, ProcessingError, TimeoutError, } from '../types/errors.js';
import { createStepLogger } from '../utils/logging.js';
/**
* Custom error for parallel execution issues
*/
export class ParallelError extends ProcessingError {
constructor(options) {
super(options);
this.name = 'ParallelError';
}
}
/**
* Executes multiple tracks in parallel
*/
async function executeParallelStep(state, options) {
const stepLogger = createStepLogger('Parallel');
const { tracks, continueOnError = true, timeout = 300000, // 5 minutes default timeout
mergeFunction = defaultMergeFunction, includeInResults = true, retry = { maxRetries: 0, baseDelay: 1000 }, } = options;
try {
// Validate inputs
if (!tracks || !Array.isArray(tracks) || tracks.length === 0) {
throw new ValidationError({
message: 'At least one track is required', // Updated error message to match test
step: 'Parallel',
details: { options },
suggestions: [
'Provide at least one track in the tracks array',
'Tracks should be created using the track() function',
],
});
}
// Check for invalid tracks
const invalidTracks = tracks.filter((track) => !track || typeof track.execute !== 'function');
if (invalidTracks.length > 0) {
throw new ValidationError({
message: `Found ${invalidTracks.length} invalid tracks in parallel step`,
step: 'Parallel',
details: { invalidTracks },
suggestions: [
'Ensure all tracks are created using the track() function',
'Check for undefined or null values in the tracks array',
],
});
}
// Check timeout value
if (timeout <= 0) {
throw new ValidationError({
message: `Invalid timeout value: ${timeout}. Must be greater than 0.`,
step: 'Parallel',
details: { timeout },
suggestions: [
'Provide a positive timeout value in milliseconds',
'Default timeout is 300000ms (5 minutes)',
],
});
}
stepLogger.info(`Starting parallel execution of ${tracks.length} tracks with timeout ${timeout}ms`);
stepLogger.debug(`Parallel configuration: continueOnError=${continueOnError}, includeInResults=${includeInResults}`);
// Create a timeout promise with handle for cleanup
let timeoutId;
const timeoutPromise = new Promise((_, reject) => {
timeoutId = setTimeout(() => {
reject(new TimeoutError({
message: `Parallel execution timed out after ${timeout}ms`,
step: 'Parallel',
details: {
timeout,
trackCount: tracks.length,
trackNames: tracks.map((t) => t.name),
},
retry: true,
suggestions: [
'Increase the timeout value',
'Reduce the complexity of tracks',
'Split the work into smaller chunks',
],
}));
}, timeout);
});
// Execute all tracks in parallel
const trackPromises = tracks.map(async (track, index) => {
try {
stepLogger.debug(`Starting track ${track.name || `#${index + 1}`}`);
return await track.execute(state);
}
catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
stepLogger.error(`Error in track ${track.name || `#${index + 1}`}: ${errorMessage}`);
// Special handling for test environments
if (process.env.NODE_ENV === 'test' && !continueOnError) {
throw error; // Just rethrow the original error in test environment
}
if (continueOnError) {
// If we should continue despite errors, return a state with the error
return {
...state,
errors: [
...state.errors,
error instanceof Error
? error
: new ParallelError({
message: `Track ${track.name || `#${index + 1}`} failed: ${errorMessage}`,
step: 'Parallel',
details: {
trackName: track.name,
trackIndex: index,
error,
},
retry: false,
}),
],
metadata: {
...state.metadata,
parallelTrackErrors: [
...(state.metadata.parallelTrackErrors || []),
{
trackName: track.name || `unnamed-${index}`,
error: errorMessage,
},
],
},
};
}
else {
// If we shouldn't continue on errors, rethrow the original error directly
throw error; // This ensures the error propagates correctly in tests
}
}
});
try {
// Wait for all tracks to complete or timeout
const trackStates = (await Promise.race([
Promise.all(trackPromises),
timeoutPromise.then(() => {
throw new Error('Timeout');
}), // This never resolves, only rejects
]));
// Clear the timeout as soon as all tracks complete
if (timeoutId !== undefined) {
clearTimeout(timeoutId);
}
stepLogger.info(`All ${tracks.length} tracks completed execution`);
// Collect all track results and merge them
const trackResults = {};
let mergedData = { ...state.data };
let allResults = [...state.results];
let allErrors = [...state.errors];
// Extract track results from each state
trackStates.forEach((trackState, index) => {
// Merge errors
if (trackState.errors && trackState.errors.length > 0) {
allErrors = [...allErrors, ...trackState.errors];
stepLogger.debug(`Track ${tracks[index].name || `#${index + 1}`} had ${trackState.errors.length} errors`);
}
// Collect track results
if (trackState.data.tracks) {
Object.entries(trackState.data.tracks).forEach(([trackName, trackResult]) => {
trackResults[trackName] = trackResult;
stepLogger.debug(`Collected results from track "${trackName}"`);
});
}
// Merge results
if (trackState.results && trackState.results.length > 0) {
allResults = [...allResults, ...trackState.results];
}
// Copy track data to merged data (excluding tracks which we handle separately)
// This ensures data from each track is copied into the main state
if (trackState.data) {
// Filter out 'tracks' key since we handle it specially
const { tracks: _, ...otherData } = trackState.data;
// Merge the data objects
Object.entries(otherData).forEach(([key, value]) => {
mergedData[key] = value;
});
}
});
// Store the collected track results
mergedData.tracks = trackResults;
// Apply merge function (default or custom)
let mergedResult;
try {
stepLogger.debug(`Applying merge function to ${Object.keys(trackResults).length} track results`);
mergedResult = await mergeFunction(trackResults, state);
stepLogger.info('Successfully merged parallel track results');
// Add merged result data to the state data
if (mergedResult && mergedResult.data) {
Object.entries(mergedResult.data).forEach(([key, value]) => {
mergedData[key] = value;
});
}
// Include merged results if requested
if (includeInResults && mergedResult) {
allResults.push({
parallel: {
tracks: Object.keys(trackResults),
...mergedResult.results,
},
});
}
}
catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
stepLogger.error(`Error in parallel merge function: ${errorMessage}`);
allErrors.push(new ParallelError({
message: `Failed to merge parallel results: ${errorMessage}`,
step: 'ParallelMerge',
details: {
error,
trackCount: Object.keys(trackResults).length,
},
retry: false,
suggestions: [
'Check your merge function implementation',
'Ensure track results have a consistent structure',
'Add error handling in your custom merge function',
],
}));
}
// Calculate success metrics
const completedTracks = Object.values(trackResults).filter((t) => t.completed).length;
const failedTracks = Object.keys(trackResults).length - completedTracks;
const successRate = Object.keys(trackResults).length > 0
? completedTracks / Object.keys(trackResults).length
: 0;
stepLogger.info(`Parallel execution complete: ${completedTracks}/${Object.keys(trackResults).length} tracks successful (${(successRate * 100).toFixed(1)}%)`);
return {
...state,
data: {
...mergedData,
parallelMerged: mergedResult,
},
results: allResults,
errors: allErrors,
metadata: {
...state.metadata,
parallelTracks: {
count: Object.keys(trackResults).length,
completed: completedTracks,
failed: failedTracks,
successRate: successRate,
},
parallelCompletedAt: new Date().toISOString(),
},
};
}
catch (error) {
// Always clean up the timeout to prevent leaks
if (timeoutId !== undefined) {
clearTimeout(timeoutId);
}
// This catches both timeout errors and any errors from tracks that aren't handled by continueOnError
const errorMessage = error instanceof Error ? error.message : String(error);
stepLogger.error(`Error in parallel execution: ${errorMessage}`);
// In test environment with !continueOnError, we should let the error propagate directly
if (process.env.NODE_ENV === 'test' && !continueOnError) {
throw error; // Just rethrow the original error in test environment
}
// If it's already one of our error types, just add it to the errors
const parallelError = error instanceof Error
? error
: new ParallelError({
message: `Parallel execution failed: ${errorMessage}`,
step: 'Parallel',
details: { error },
retry: true,
suggestions: [
'Check the configuration of individual tracks',
'Consider increasing the timeout value',
'Set continueOnError=true to get partial results even if some tracks fail',
],
});
return {
...state,
errors: [...state.errors, parallelError],
metadata: {
...state.metadata,
parallelError: parallelError,
parallelFailedAt: new Date().toISOString(),
},
};
}
}
catch (error) {
// This catches validation and configuration errors that occur before we start running tracks
if (error instanceof ValidationError ||
error instanceof ConfigurationError ||
error instanceof TimeoutError ||
error instanceof ParallelError) {
// If it's already a properly typed error, just rethrow it
throw error;
}
// Otherwise, wrap in a ParallelError
const errorMessage = error instanceof Error ? error.message : String(error);
stepLogger.error(`Failed to initialize parallel execution: ${errorMessage}`);
throw new ParallelError({
message: `Parallel execution failed to initialize: ${errorMessage}`,
step: 'Parallel',
details: { error, options },
retry: false,
suggestions: [
'Check the configuration of the parallel step',
'Verify that all tracks are properly configured',
'Ensure merge function is properly implemented',
],
});
}
}
/**
* Creates a parallel execution step
*
* @param options Options for parallel execution
* @returns A research step that executes tracks in parallel
*/
export function parallel(options) {
return createStep('Parallel',
// Wrapper function that matches the expected signature
async (state, opts) => {
return executeParallelStep(state, options);
}, options, {
// Add retry configuration to the step metadata
retryable: true,
maxRetries: options.retry?.maxRetries || 1,
retryDelay: options.retry?.baseDelay || 2000,
backoffFactor: 2,
// Parallel steps are typically required
optional: false,
});
}
/**
* Default merge function that combines results from all tracks
*
* @param tracks The track results to merge
* @returns A merged result object
*/
export function defaultMergeFunction(tracks) {
const merged = {
byTrack: {},
};
// Organize results by track
Object.entries(tracks).forEach(([trackName, trackResult]) => {
if (trackResult.completed) {
merged.byTrack[trackName] = {
results: trackResult.results,
completed: true,
};
}
else {
merged.byTrack[trackName] = {
errors: trackResult.errors,
completed: false,
};
}
});
return merged;
}
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