autotel
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Write Once, Observe Anywhere
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* Workflow and Saga tracing helpers\n *\n * Provides specialized tracing for multi-step workflows and sagas with\n * automatic step linking, compensation tracking, and workflow correlation.\n *\n * @example Simple workflow\n * ```typescript\n * import { traceWorkflow, traceStep } from 'autotel/workflow';\n *\n * export const processOrder = traceWorkflow({\n * name: 'OrderFulfillment',\n * workflowId: (order) => order.id,\n * })(ctx => async (order: Order) => {\n * await validateOrder(order);\n * await chargePayment(order);\n * await shipOrder(order);\n * });\n * ```\n *\n * @example Saga with compensation\n * ```typescript\n * import { traceWorkflow, traceStep } from 'autotel/workflow';\n *\n * export const orderSaga = traceWorkflow({\n * name: 'OrderSaga',\n * workflowId: () => generateUUID(),\n * })(ctx => async (order: Order) => {\n *\n * const reserveStep = traceStep({\n * name: 'ReserveInventory',\n * compensate: async () => {\n * await releaseInventory(order.items);\n * },\n * })(async () => {\n * await inventoryService.reserve(order.items);\n * });\n * await reserveStep();\n *\n * const paymentStep = traceStep({\n * name: 'ProcessPayment',\n * linkToPrevious: true,\n * compensate: async () => {\n * await refundPayment(order.paymentId);\n * },\n * })(async () => {\n * await paymentService.charge(order);\n * });\n * await paymentStep();\n * });\n * ```\n *\n * @module\n */\n\nimport { AsyncLocalStorage } from 'node:async_hooks';\nimport type { Attributes, Link, SpanContext } from '@opentelemetry/api';\nimport { emitCorrelatedEvent } from './correlated-events';\nimport { trace } from './functional';\nimport type { TraceContext } from './trace-context';\nimport { getActiveSpan } from './trace-helpers';\n\n// ============================================================================\n// Types\n// ============================================================================\n\n/**\n * Workflow status\n */\nexport type WorkflowStatus =\n | 'pending'\n | 'running'\n | 'completed'\n | 'failed'\n | 'compensating'\n | 'compensated'\n | 'compensation_failed';\n\n/**\n * Step status\n */\nexport type StepStatus =\n | 'pending'\n | 'running'\n | 'completed'\n | 'failed'\n | 'skipped'\n | 'compensated';\n\n/**\n * Configuration for workflow tracing\n */\nexport interface WorkflowConfig<TArgs extends unknown[] = unknown[]> {\n /** Workflow name (e.g., 'OrderFulfillment', 'UserOnboarding') */\n name: string;\n\n /**\n * Function to extract or generate workflow ID\n * Can be static string, function of args, or generator\n */\n workflowId: string | ((...args: TArgs) => string);\n\n /** Optional workflow version */\n version?: string;\n\n /** Additional attributes */\n attributes?: Attributes;\n\n /** Callback on workflow completion */\n onComplete?: (ctx: WorkflowContext, result: unknown) => void;\n\n /** Callback on workflow failure */\n onFailed?: (ctx: WorkflowContext, error: Error) => void;\n\n /** Callback on compensation start */\n onCompensating?: (ctx: WorkflowContext) => void;\n}\n\n/**\n * Configuration for workflow step tracing\n */\nexport interface StepConfig {\n /** Step name */\n name: string;\n\n /** Optional step description */\n description?: string;\n\n /** Step index (auto-assigned if not provided) */\n index?: number;\n\n /** Link to previous step span */\n linkToPrevious?: boolean;\n\n /** Link to specific step(s) by name */\n linkTo?: string | string[];\n\n /** Additional attributes */\n attributes?: Attributes;\n\n /** Compensation handler for saga rollback */\n compensate?: (error: Error) => Promise<void> | void;\n\n /** Whether this step is idempotent */\n idempotent?: boolean;\n\n /** Retry configuration */\n retry?: {\n maxAttempts: number;\n backoffMs?: number;\n };\n\n /** Callback on step completion */\n onComplete?: (ctx: StepContext) => void;\n\n /** Callback on step failure */\n onFailed?: (ctx: StepContext, error: Error) => void;\n}\n\n/**\n * Step metadata stored for linking and compensation\n */\ninterface StepMetadata {\n name: string;\n index: number;\n status: StepStatus;\n spanContext?: SpanContext;\n compensate?: (error: Error) => Promise<void> | void;\n startTime: number;\n endTime?: number;\n}\n\n/**\n * Extended trace context for workflows\n */\nexport interface WorkflowContext extends TraceContext {\n /** Get the workflow ID */\n getWorkflowId(): string;\n\n /** Get workflow name */\n getWorkflowName(): string;\n\n /** Get current workflow status */\n getStatus(): WorkflowStatus;\n\n /** Mark step as completed and store for linking */\n completeStep(stepName: string): void;\n\n /** Get previous step's span context for linking */\n getPreviousStep(stepName?: string): SpanContext | null;\n\n /** Get all completed steps */\n getCompletedSteps(): string[];\n\n /** Register a compensation handler */\n registerCompensation(\n stepName: string,\n handler: (error: Error) => Promise<void> | void,\n ): void;\n\n /** Trigger compensation for all registered steps */\n compensate(error: Error): Promise<void>;\n\n /** Record compensation result */\n recordCompensation(stepName: string, success: boolean, error?: Error): void;\n\n /** Set workflow status */\n setWorkflowStatus(status: WorkflowStatus): void;\n}\n\n/**\n * Extended trace context for workflow steps\n */\nexport interface StepContext extends TraceContext {\n /** Get step name */\n getStepName(): string;\n\n /** Get step index */\n getStepIndex(): number;\n\n /** Mark this step as completed */\n complete(): void;\n\n /** Skip this step */\n skip(reason?: string): void;\n\n /** Get workflow context */\n getWorkflowContext(): WorkflowContext | null;\n}\n\n// ============================================================================\n// Storage\n// ============================================================================\n\n// Store workflow state in a WeakMap keyed by span\nconst workflowStates = new WeakMap<\n object,\n {\n workflowId: string;\n workflowName: string;\n status: WorkflowStatus;\n steps: Map<string, StepMetadata>;\n stepCounter: number;\n compensations: Map<string, (error: Error) => Promise<void> | void>;\n }\n>();\n\n/**\n * AsyncLocalStorage for workflow context (async-safe)\n *\n * This replaces the previous module-level variable which was NOT safe for\n * concurrent workflows. AsyncLocalStorage ensures each async execution chain\n * has its own isolated workflow context.\n */\nconst workflowContextStorage = new AsyncLocalStorage<WorkflowContext>();\n\n// ============================================================================\n// Workflow Helper\n// ============================================================================\n\n/**\n * Create a traced workflow function\n *\n * Wraps business logic in a workflow span with automatic step tracking,\n * correlation via workflow ID, and compensation support.\n *\n * @param config - Workflow configuration\n * @returns Factory function that wraps your workflow logic\n *\n * @example Order fulfillment workflow\n * ```typescript\n * export const fulfillOrder = traceWorkflow({\n * name: 'OrderFulfillment',\n * workflowId: (order) => order.id,\n * version: '2.0',\n * })(ctx => async (order: Order) => {\n * ctx.setAttribute('order.total', order.total);\n *\n * await validateOrder(order);\n * await processPayment(order);\n * await fulfillItems(order);\n * await notifyCustomer(order);\n *\n * return { success: true, orderId: order.id };\n * });\n * ```\n */\nexport function traceWorkflow<TArgs extends unknown[], TReturn>(\n config: WorkflowConfig<TArgs>,\n) {\n const spanName = `workflow.${config.name}`;\n\n return (\n fnFactory: (ctx: WorkflowContext) => (...args: TArgs) => Promise<TReturn>,\n ): ((...args: TArgs) => Promise<TReturn>) => {\n return trace<TArgs, TReturn>(spanName, (baseCtx) => {\n return async (...args: TArgs) => {\n // Generate or extract workflow ID\n const workflowId =\n typeof config.workflowId === 'function'\n ? config.workflowId(...args)\n : config.workflowId;\n\n // Create workflow context\n const ctx = createWorkflowContext(baseCtx, config.name, workflowId);\n\n // Set workflow attributes\n ctx.setAttribute('workflow.name', config.name);\n ctx.setAttribute('workflow.id', workflowId);\n if (config.version) {\n ctx.setAttribute('workflow.version', config.version);\n }\n ctx.setAttribute('workflow.status', 'running');\n\n // Set custom attributes\n if (config.attributes) {\n for (const [key, value] of Object.entries(config.attributes)) {\n if (value !== undefined) {\n ctx.setAttribute(key, value as string | number | boolean);\n }\n }\n }\n\n // Run workflow in AsyncLocalStorage context for async-safety\n // This ensures concurrent workflows have isolated contexts\n return workflowContextStorage.run(ctx, async () => {\n try {\n // Execute workflow\n const userFn = fnFactory(ctx);\n const result = await userFn(...args);\n\n // Mark as completed\n ctx.setWorkflowStatus('completed');\n config.onComplete?.(ctx, result);\n\n return result;\n } catch (error) {\n // Mark as failed\n ctx.setWorkflowStatus('failed');\n config.onFailed?.(ctx, error as Error);\n\n // Check if we have compensations to run\n const state = getWorkflowState();\n if (state && state.compensations.size > 0) {\n ctx.setWorkflowStatus('compensating');\n config.onCompensating?.(ctx);\n\n try {\n await ctx.compensate(error as Error);\n ctx.setWorkflowStatus('compensated');\n } catch (compensationError) {\n ctx.setWorkflowStatus('compensation_failed');\n ctx.setAttribute(\n 'workflow.compensation.error',\n String(compensationError),\n );\n }\n }\n\n throw error;\n }\n });\n };\n });\n };\n}\n\n/**\n * Create a traced workflow step\n *\n * Wraps step logic with automatic linking to previous steps,\n * compensation registration, and status tracking.\n *\n * @param config - Step configuration\n * @returns Factory function that wraps your step logic\n *\n * @example Step with compensation\n * ```typescript\n * const chargePayment = traceStep({\n * name: 'ChargePayment',\n * linkToPrevious: true,\n * compensate: async (error) => {\n * await paymentService.refund(paymentId);\n * },\n * })(async (amount: number) => {\n * return await paymentService.charge(amount);\n * });\n * ```\n */\nexport function traceStep<TArgs extends unknown[], TReturn>(\n config: StepConfig,\n) {\n return (\n fn: (...args: TArgs) => Promise<TReturn>,\n ): ((...args: TArgs) => Promise<TReturn>) => {\n const spanName = `step.${config.name}`;\n\n return trace<TArgs, TReturn>(spanName, (baseCtx) => {\n return async (...args: TArgs) => {\n // Get workflow context from AsyncLocalStorage (async-safe)\n const workflowCtx = workflowContextStorage.getStore() ?? null;\n\n // Create step context\n const ctx = createStepContext(baseCtx, config, workflowCtx);\n\n // Set step attributes\n ctx.setAttribute('workflow.step.name', config.name);\n ctx.setAttribute('workflow.step.index', ctx.getStepIndex());\n ctx.setAttribute('workflow.step.status', 'running');\n\n if (config.description) {\n ctx.setAttribute('workflow.step.description', config.description);\n }\n\n if (config.idempotent) {\n ctx.setAttribute('workflow.step.idempotent', true);\n }\n\n // Set custom attributes\n if (config.attributes) {\n for (const [key, value] of Object.entries(config.attributes)) {\n if (value !== undefined) {\n ctx.setAttribute(key, value as string | number | boolean);\n }\n }\n }\n\n // Link to previous steps\n await addStepLinks(ctx, config, workflowCtx);\n\n // Register compensation if provided\n if (config.compensate && workflowCtx) {\n workflowCtx.registerCompensation(config.name, config.compensate);\n }\n\n // Execute with optional retry\n let lastError: Error | undefined;\n const maxAttempts = config.retry?.maxAttempts ?? 1;\n\n for (let attempt = 1; attempt <= maxAttempts; attempt++) {\n try {\n if (attempt > 1) {\n ctx.setAttribute('workflow.step.retry_attempt', attempt);\n emitCorrelatedEvent(ctx, 'step_retry', {\n 'workflow.step.attempt': attempt,\n 'workflow.step.max_attempts': maxAttempts,\n });\n\n // Backoff\n if (config.retry?.backoffMs) {\n await sleep(config.retry.backoffMs * attempt);\n }\n }\n\n const result = await fn(...args);\n\n // Mark as completed\n ctx.setAttribute('workflow.step.status', 'completed');\n ctx.complete();\n config.onComplete?.(ctx);\n\n return result;\n } catch (error) {\n lastError = error as Error;\n\n if (attempt < maxAttempts) {\n emitCorrelatedEvent(ctx, 'step_retry_scheduled', {\n 'workflow.step.error': String(error),\n 'workflow.step.attempt': attempt,\n });\n }\n }\n }\n\n // All attempts failed\n ctx.setAttribute('workflow.step.status', 'failed');\n ctx.setAttribute('workflow.step.error', String(lastError));\n config.onFailed?.(ctx, lastError!);\n\n throw lastError;\n };\n });\n };\n}\n\n// ============================================================================\n// Context Creation\n// ============================================================================\n\n/**\n * Create workflow-extended context\n */\nfunction createWorkflowContext(\n baseCtx: TraceContext,\n workflowName: string,\n workflowId: string,\n): WorkflowContext {\n // Initialize state\n const span = getActiveSpan();\n const state = {\n workflowId,\n workflowName,\n status: 'running' as WorkflowStatus,\n steps: new Map<string, StepMetadata>(),\n stepCounter: 0,\n compensations: new Map<string, (error: Error) => Promise<void> | void>(),\n };\n\n if (span) {\n workflowStates.set(span, state);\n }\n\n return {\n ...baseCtx,\n\n getWorkflowId(): string {\n return workflowId;\n },\n\n getWorkflowName(): string {\n return workflowName;\n },\n\n getStatus(): WorkflowStatus {\n return state.status;\n },\n\n completeStep(stepName: string): void {\n let step = state.steps.get(stepName);\n if (!step) {\n // Auto-create step entry for manually managed steps\n // (when using registerCompensation without traceStep)\n step = {\n name: stepName,\n index: state.stepCounter++,\n status: 'pending',\n startTime: Date.now(),\n };\n state.steps.set(stepName, step);\n }\n step.status = 'completed';\n step.endTime = Date.now();\n\n // Capture span context for linking\n const currentSpan = getActiveSpan();\n if (currentSpan) {\n step.spanContext = currentSpan.spanContext();\n }\n },\n\n getPreviousStep(stepName?: string): SpanContext | null {\n if (stepName) {\n const step = state.steps.get(stepName);\n return step?.spanContext ?? null;\n }\n\n // Get last completed step\n let lastStep: StepMetadata | null = null;\n for (const step of state.steps.values()) {\n if (\n step.status === 'completed' &&\n (!lastStep || step.index > lastStep.index)\n ) {\n lastStep = step;\n }\n }\n\n return lastStep?.spanContext ?? null;\n },\n\n getCompletedSteps(): string[] {\n const completed: string[] = [];\n for (const [name, step] of state.steps) {\n if (step.status === 'completed') {\n completed.push(name);\n }\n }\n return completed.toSorted(\n (a, b) =>\n (state.steps.get(a)?.index ?? 0) - (state.steps.get(b)?.index ?? 0),\n );\n },\n\n registerCompensation(\n stepName: string,\n handler: (error: Error) => Promise<void> | void,\n ): void {\n state.compensations.set(stepName, handler);\n },\n\n async compensate(error: Error): Promise<void> {\n // Execute compensations in reverse order\n const compensationOrder = [...state.compensations.entries()].toReversed();\n\n for (const [stepName, handler] of compensationOrder) {\n const step = state.steps.get(stepName);\n if (step && step.status === 'completed') {\n try {\n emitCorrelatedEvent(baseCtx, 'compensation_started', {\n 'workflow.step.name': stepName,\n });\n\n await Promise.resolve(handler(error));\n\n this.recordCompensation(stepName, true);\n step.status = 'compensated';\n } catch (compensationError) {\n this.recordCompensation(\n stepName,\n false,\n compensationError as Error,\n );\n throw compensationError;\n }\n }\n }\n },\n\n recordCompensation(\n stepName: string,\n success: boolean,\n error?: Error,\n ): void {\n emitCorrelatedEvent(baseCtx, 'compensation_completed', {\n 'workflow.step.name': stepName,\n 'workflow.compensation.success': success,\n ...(error && { 'workflow.compensation.error': String(error) }),\n });\n\n baseCtx.setAttribute(\n `workflow.compensation.${stepName}`,\n success ? 'success' : 'failed',\n );\n },\n\n setWorkflowStatus(status: WorkflowStatus): void {\n state.status = status;\n baseCtx.setAttribute('workflow.status', status);\n\n emitCorrelatedEvent(baseCtx, 'workflow_status_changed', {\n 'workflow.status': status,\n });\n },\n };\n}\n\n/**\n * Create step-extended context\n */\nfunction createStepContext(\n baseCtx: TraceContext,\n config: StepConfig,\n workflowCtx: WorkflowContext | null,\n): StepContext {\n // Determine step index\n let stepIndex = config.index ?? 0;\n if (workflowCtx) {\n const span = getActiveSpan();\n if (span) {\n const state = workflowStates.get(span);\n if (state) {\n stepIndex = config.index ?? state.stepCounter++;\n }\n }\n }\n\n // Register step metadata\n if (workflowCtx) {\n const wfSpan = getActiveSpan();\n if (wfSpan) {\n const state = workflowStates.get(wfSpan);\n if (state) {\n state.steps.set(config.name, {\n name: config.name,\n index: stepIndex,\n status: 'running',\n startTime: Date.now(),\n compensate: config.compensate,\n });\n }\n }\n }\n\n return {\n ...baseCtx,\n\n getStepName(): string {\n return config.name;\n },\n\n getStepIndex(): number {\n return stepIndex;\n },\n\n complete(): void {\n if (workflowCtx) {\n workflowCtx.completeStep(config.name);\n }\n },\n\n skip(reason?: string): void {\n baseCtx.setAttribute('workflow.step.status', 'skipped');\n if (reason) {\n baseCtx.setAttribute('workflow.step.skip_reason', reason);\n }\n emitCorrelatedEvent(baseCtx, 'step_skipped', {\n 'workflow.step.name': config.name,\n ...(reason && { 'workflow.step.skip_reason': reason }),\n });\n },\n\n getWorkflowContext(): WorkflowContext | null {\n return workflowCtx;\n },\n };\n}\n\n// ============================================================================\n// Helper Functions\n// ============================================================================\n\n/**\n * Get workflow state from context\n */\nfunction getWorkflowState() {\n const span = getActiveSpan();\n return span ? workflowStates.get(span) : null;\n}\n\n/**\n * Add links to previous steps\n */\nasync function addStepLinks(\n ctx: StepContext,\n config: StepConfig,\n workflowCtx: WorkflowContext | null,\n): Promise<void> {\n if (!workflowCtx) return;\n\n const links: Link[] = [];\n\n // Link to previous step\n if (config.linkToPrevious) {\n const prevSpanContext = workflowCtx.getPreviousStep();\n if (prevSpanContext) {\n links.push({\n context: prevSpanContext,\n attributes: {\n 'workflow.link.type': 'sequence',\n },\n });\n }\n }\n\n // Link to specific steps\n if (config.linkTo) {\n const stepNames = Array.isArray(config.linkTo)\n ? config.linkTo\n : [config.linkTo];\n\n for (const stepName of stepNames) {\n const spanContext = workflowCtx.getPreviousStep(stepName);\n if (spanContext) {\n links.push({\n context: spanContext,\n attributes: {\n 'workflow.link.type': 'dependency',\n 'workflow.link.step': stepName,\n },\n });\n }\n }\n }\n\n // Add all links\n if (links.length > 0) {\n ctx.addLinks(links);\n }\n}\n\n/**\n * Sleep utility for retry backoff\n */\nfunction sleep(ms: number): Promise<void> {\n return new Promise((resolve) => setTimeout(resolve, ms));\n}\n\n// ============================================================================\n// Convenience Exports\n// ============================================================================\n\n/**\n * Get current workflow context (if inside a workflow)\n *\n * Uses AsyncLocalStorage to ensure async-safety when multiple\n * workflows are running concurrently.\n */\nexport function getCurrentWorkflowContext(): WorkflowContext | null {\n return workflowContextStorage.getStore() ?? null;\n}\n\n/**\n * Check if currently executing inside a workflow\n *\n * Uses AsyncLocalStorage to ensure async-safety when multiple\n * workflows are running concurrently.\n */\nexport function isInWorkflow(): boolean {\n return workflowContextStorage.getStore() !== undefined;\n}\n"]}