355 lines
13 KiB
JavaScript
355 lines
13 KiB
JavaScript
/**
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* Maestro Plugin - Official Plugin (ADR-004)
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*
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* Implements orchestration patterns for complex multi-agent workflows.
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* Part of the official plugin collection.
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*
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* @module v3/shared/plugins/official/maestro
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*/
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import { HookEvent, HookPriority } from '../../hooks/index.js';
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/**
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* Maestro Plugin Implementation
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*/
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export class MaestroPlugin {
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id = 'maestro';
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name = 'Maestro Workflow Orchestrator';
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version = '1.0.0';
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description = 'Complex multi-agent workflow orchestration with adaptive strategies';
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context;
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config;
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workflows = new Map();
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activeWorkflows = 0;
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constructor(config) {
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this.config = {
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enabled: true,
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orchestrationMode: 'adaptive',
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maxConcurrentWorkflows: 5,
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workflowTimeout: 600000, // 10 minutes
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autoRecovery: true,
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checkpointInterval: 30000, // 30 seconds
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...config,
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};
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}
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async initialize(context) {
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this.context = context;
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// Register hooks for workflow monitoring
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context.hooks?.register(HookEvent.PostTaskComplete, async (ctx) => {
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// Update workflow progress on task completion
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for (const workflow of this.workflows.values()) {
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if (workflow.status === 'running' && ctx.task) {
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this.updateWorkflowProgress(workflow, ctx.task);
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}
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}
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return { success: true, continueChain: true };
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}, HookPriority.High, { name: 'maestro-task-complete' });
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context.hooks?.register(HookEvent.OnError, async (ctx) => {
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// Handle workflow errors with recovery
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if (this.config.autoRecovery && ctx.error) {
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for (const workflow of this.workflows.values()) {
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if (workflow.status === 'running') {
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this.handleWorkflowError(workflow, ctx.error);
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}
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}
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}
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return { success: true, continueChain: true };
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}, HookPriority.High, { name: 'maestro-error-handler' });
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}
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async shutdown() {
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// Checkpoint all running workflows
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for (const workflow of this.workflows.values()) {
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if (workflow.status === 'running') {
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this.checkpointWorkflow(workflow);
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}
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}
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this.workflows.clear();
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this.context = undefined;
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}
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// ============================================================================
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// Workflow Management
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// ============================================================================
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/**
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* Create a new workflow
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*/
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createWorkflow(name, description, steps) {
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const workflow = {
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id: `workflow-${Date.now()}`,
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name,
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description,
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steps: steps.map((step, index) => ({
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...step,
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id: `step-${index}`,
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status: 'pending',
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})),
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status: 'created',
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progress: 0,
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createdAt: new Date(),
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checkpoints: new Map(),
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};
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this.workflows.set(workflow.id, workflow);
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return workflow;
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}
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/**
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* Execute a workflow
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*/
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async executeWorkflow(workflowId) {
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const workflow = this.workflows.get(workflowId);
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if (!workflow) {
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throw new Error(`Workflow not found: ${workflowId}`);
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}
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if (this.activeWorkflows >= this.config.maxConcurrentWorkflows) {
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throw new Error('Maximum concurrent workflows reached');
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}
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const startTime = Date.now();
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workflow.status = 'running';
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workflow.startedAt = new Date();
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this.activeWorkflows++;
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const errors = [];
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const outputs = {};
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try {
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switch (this.config.orchestrationMode) {
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case 'sequential':
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await this.executeSequential(workflow, outputs, errors);
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break;
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case 'parallel':
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await this.executeParallel(workflow, outputs, errors);
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break;
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case 'adaptive':
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await this.executeAdaptive(workflow, outputs, errors);
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break;
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}
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workflow.status = errors.length === 0 ? 'completed' : 'failed';
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workflow.completedAt = new Date();
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}
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catch (error) {
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workflow.status = 'failed';
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errors.push({
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stepId: 'workflow',
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error: error instanceof Error ? error.message : String(error),
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});
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}
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finally {
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this.activeWorkflows--;
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}
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return {
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workflowId,
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success: workflow.status === 'completed',
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stepsCompleted: workflow.steps.filter((s) => s.status === 'completed').length,
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stepsTotal: workflow.steps.length,
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outputs,
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errors,
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duration: Date.now() - startTime,
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};
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}
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/**
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* Pause a workflow
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*/
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pauseWorkflow(workflowId) {
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const workflow = this.workflows.get(workflowId);
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if (!workflow || workflow.status !== 'running')
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return false;
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this.checkpointWorkflow(workflow);
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workflow.status = 'paused';
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return true;
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}
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/**
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* Resume a paused workflow
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*/
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async resumeWorkflow(workflowId) {
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const workflow = this.workflows.get(workflowId);
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if (!workflow || workflow.status !== 'paused') {
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throw new Error('Workflow cannot be resumed');
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}
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// Restore from checkpoint and continue
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return this.executeWorkflow(workflowId);
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}
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/**
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* Get workflow status
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*/
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getWorkflow(workflowId) {
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return this.workflows.get(workflowId);
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}
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/**
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* List all workflows
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*/
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listWorkflows() {
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return Array.from(this.workflows.values());
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}
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// ============================================================================
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// Execution Strategies
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// ============================================================================
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async executeSequential(workflow, outputs, errors) {
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for (const step of workflow.steps) {
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if (step.status !== 'pending')
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continue;
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// Check dependencies
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const depsComplete = step.dependencies.every((depId) => {
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const dep = workflow.steps.find((s) => s.id === depId);
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return dep?.status === 'completed';
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});
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if (!depsComplete) {
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step.status = 'skipped';
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continue;
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}
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workflow.currentStep = step.id;
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const result = await this.executeStep(step, outputs);
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if (!result.success) {
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errors.push({ stepId: step.id, error: result.error ?? 'Unknown error' });
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break;
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}
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outputs[step.id] = result.output;
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this.updateProgress(workflow);
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}
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}
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async executeParallel(workflow, outputs, errors) {
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const layers = this.buildExecutionLayers(workflow.steps);
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for (const layer of layers) {
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const results = await Promise.all(layer.map((step) => this.executeStep(step, outputs)));
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for (let i = 0; i < results.length; i++) {
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const result = results[i];
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const step = layer[i];
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if (!result.success) {
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errors.push({ stepId: step.id, error: result.error ?? 'Unknown error' });
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}
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else {
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outputs[step.id] = result.output;
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}
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}
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this.updateProgress(workflow);
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}
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}
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async executeAdaptive(workflow, outputs, errors) {
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// Adaptive: start parallel, switch to sequential on errors
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const completedIds = new Set();
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const pendingSteps = [...workflow.steps];
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let consecutiveErrors = 0;
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const maxConsecutiveErrors = 2;
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while (pendingSteps.length > 0) {
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// Find steps that can run (all dependencies complete)
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const runnableSteps = pendingSteps.filter((step) => step.dependencies.every((depId) => completedIds.has(depId)));
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if (runnableSteps.length === 0) {
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// No runnable steps but pending remain - circular dependency
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for (const step of pendingSteps) {
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step.status = 'skipped';
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}
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break;
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}
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// Decide batch size based on error rate
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const batchSize = consecutiveErrors >= maxConsecutiveErrors ? 1 : runnableSteps.length;
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const batch = runnableSteps.slice(0, batchSize);
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const results = await Promise.all(batch.map((step) => this.executeStep(step, outputs)));
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for (let i = 0; i < results.length; i++) {
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const result = results[i];
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const step = batch[i];
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const stepIndex = pendingSteps.indexOf(step);
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if (stepIndex > -1) {
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pendingSteps.splice(stepIndex, 1);
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}
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if (!result.success) {
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errors.push({ stepId: step.id, error: result.error ?? 'Unknown error' });
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consecutiveErrors++;
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}
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else {
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outputs[step.id] = result.output;
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completedIds.add(step.id);
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consecutiveErrors = 0;
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}
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}
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this.updateProgress(workflow);
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}
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}
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// ============================================================================
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// Helpers
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// ============================================================================
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async executeStep(step, outputs) {
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step.status = 'running';
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step.startedAt = new Date();
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try {
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// Resolve input references from previous outputs
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const resolvedInput = this.resolveInputReferences(step.input, outputs);
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// Execute step processing with minimal overhead
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// Actual task execution delegated to agents via MCP integration
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await new Promise((resolve) => setTimeout(resolve, 10));
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step.output = { ...resolvedInput, processed: true };
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step.status = 'completed';
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step.completedAt = new Date();
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return { success: true, output: step.output };
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}
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catch (error) {
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step.status = 'failed';
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step.error = error instanceof Error ? error.message : String(error);
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step.completedAt = new Date();
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return { success: false, error: step.error };
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}
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}
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buildExecutionLayers(steps) {
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const layers = [];
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const completed = new Set();
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while (completed.size < steps.length) {
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const layer = [];
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for (const step of steps) {
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if (completed.has(step.id))
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continue;
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const depsComplete = step.dependencies.every((depId) => completed.has(depId));
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if (depsComplete) {
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layer.push(step);
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}
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}
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if (layer.length === 0)
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break; // No more runnable steps
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layers.push(layer);
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layer.forEach((step) => completed.add(step.id));
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}
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return layers;
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}
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resolveInputReferences(input, outputs) {
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const resolved = {};
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for (const [key, value] of Object.entries(input)) {
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if (typeof value === 'string' && value.startsWith('$')) {
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const ref = value.slice(1);
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resolved[key] = outputs[ref];
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}
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else {
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resolved[key] = value;
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}
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}
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return resolved;
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}
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updateProgress(workflow) {
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const completed = workflow.steps.filter((s) => s.status === 'completed').length;
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workflow.progress = (completed / workflow.steps.length) * 100;
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}
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updateWorkflowProgress(workflow, taskData) {
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// Match task to workflow step and update
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const taskId = taskData.id;
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const step = workflow.steps.find((s) => s.id === taskId);
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if (step && step.status === 'running') {
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step.status = 'completed';
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step.output = taskData.metadata;
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step.completedAt = new Date();
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this.updateProgress(workflow);
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}
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}
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handleWorkflowError(workflow, errorData) {
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const stepId = errorData.context ?? '';
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const step = workflow.steps.find((s) => s.id === stepId);
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if (step && step.status === 'running') {
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step.status = 'failed';
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step.error = errorData.error?.message ?? 'Unknown error';
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step.completedAt = new Date();
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}
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}
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checkpointWorkflow(workflow) {
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workflow.checkpoints.set(`checkpoint-${Date.now()}`, {
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progress: workflow.progress,
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currentStep: workflow.currentStep,
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stepStatuses: workflow.steps.map((s) => ({ id: s.id, status: s.status })),
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});
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}
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}
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/**
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* Factory function
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*/
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export function createMaestroPlugin(config) {
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return new MaestroPlugin(config);
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}
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//# sourceMappingURL=maestro-plugin.js.map
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