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type { WorkflowStorage } from \"./storage.ts\";\nimport type {\n\tExecutionContext,\n\tStep,\n\tStepExecutionContext,\n\tStepResult,\n} from \"./types.ts\";\nimport type { Workflow } from \"./workflow.ts\";\n\n/**\n * Execution engine that runs workflows step by step\n */\nexport class ExecutionEngine {\n\tconstructor(private storage: WorkflowStorage) {}\n\n\t/**\n\t * Execute a workflow from start to finish\n\t */\n\tasync execute(params: {\n\t\tworkflow: Workflow;\n\t\trunId: string;\n\t\tinputData: TInput;\n\t\tinitialState?: TState;\n\t}): Promise {\n\t\tconst { workflow, runId, inputData, initialState } = params;\n\n\t\t// Validate input data at runtime\n\t\tconst validatedInput = workflow.inputSchema.parse(inputData);\n\n\t\t// Initialize execution context\n\t\tconst context: ExecutionContext = {\n\t\t\tworkflowId: workflow.id,\n\t\t\trunId,\n\t\t\texecutionPath: [],\n\t\t\tstepResults: {},\n\t\t\tstate:\n\t\t\t\tinitialState ??\n\t\t\t\t(workflow.stateSchema ? ({} as TState) : undefined as unknown as TState),\n\t\t\tinputData: validatedInput,\n\t\t};\n\n\t\t// Save initial snapshot\n\t\tawait this.storage.saveSnapshot({\n\t\t\trunId,\n\t\t\tworkflowId: workflow.id,\n\t\t\tstatus: \"running\",\n\t\t\texecutionPath: context.executionPath,\n\t\t\tstepResults: context.stepResults,\n\t\t\tstate: context.state,\n\t\t\tinputData: validatedInput,\n\t\t\ttimestamp: Date.now(),\n\t\t});\n\n\t\ttry {\n\t\t\t// Execute all steps sequentially\n\t\t\tlet currentOutput: unknown = validatedInput;\n\n\t\t\tfor (let i = 0; i < workflow.stepFlow.length; i++) {\n\t\t\t\tcontext.executionPath.push(i);\n\n\t\t\t\tconst entry = workflow.stepFlow[i];\n\n\t\t\t\tif (entry.type === \"step\") {\n\t\t\t\t\tconst result = await this.executeStep(\n\t\t\t\t\t\tentry.step,\n\t\t\t\t\t\tcontext,\n\t\t\t\t\t\tcurrentOutput,\n\t\t\t\t\t);\n\n\t\t\t\t\tcontext.stepResults[entry.step.id] = result;\n\n\t\t\t\t\tif (result.status === \"failed\") {\n\t\t\t\t\t\t// Save failed state\n\t\t\t\t\t\tawait this.storage.saveSnapshot({\n\t\t\t\t\t\t\trunId,\n\t\t\t\t\t\t\tworkflowId: workflow.id,\n\t\t\t\t\t\t\tstatus: \"failed\",\n\t\t\t\t\t\t\texecutionPath: context.executionPath,\n\t\t\t\t\t\t\tstepResults: context.stepResults,\n\t\t\t\t\t\t\tstate: context.state,\n\t\t\t\t\t\t\tinputData: validatedInput,\n\t\t\t\t\t\t\terror: result.error.message,\n\t\t\t\t\t\t\ttimestamp: Date.now(),\n\t\t\t\t\t\t});\n\n\t\t\t\t\t\tthrow result.error;\n\t\t\t\t\t}\n\n\t\t\t\t\tif (result.status === \"success\") {\n\t\t\t\t\t\tcurrentOutput = result.output;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Save progress after each step\n\t\t\t\t\tawait this.storage.saveSnapshot({\n\t\t\t\t\t\trunId,\n\t\t\t\t\t\tworkflowId: workflow.id,\n\t\t\t\t\t\tstatus: \"running\",\n\t\t\t\t\t\texecutionPath: context.executionPath,\n\t\t\t\t\t\tstepResults: context.stepResults,\n\t\t\t\t\t\tstate: context.state,\n\t\t\t\t\t\tinputData: validatedInput,\n\t\t\t\t\t\ttimestamp: Date.now(),\n\t\t\t\t\t});\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Validate output\n\t\t\tconst validatedOutput = workflow.outputSchema.parse(currentOutput);\n\n\t\t\t// Save success state\n\t\t\tawait this.storage.saveSnapshot({\n\t\t\t\trunId,\n\t\t\t\tworkflowId: workflow.id,\n\t\t\t\tstatus: \"success\",\n\t\t\t\texecutionPath: context.executionPath,\n\t\t\t\tstepResults: context.stepResults,\n\t\t\t\tstate: context.state,\n\t\t\t\tinputData: validatedInput,\n\t\t\t\tresult: validatedOutput,\n\t\t\t\ttimestamp: Date.now(),\n\t\t\t});\n\n\t\t\treturn validatedOutput;\n\t\t} catch (error) {\n\t\t\t// If error wasn't already saved (e.g., validation error)\n\t\t\tawait this.storage.saveSnapshot({\n\t\t\t\trunId,\n\t\t\t\tworkflowId: workflow.id,\n\t\t\t\tstatus: \"failed\",\n\t\t\t\texecutionPath: context.executionPath,\n\t\t\t\tstepResults: context.stepResults,\n\t\t\t\tstate: context.state,\n\t\t\t\tinputData: validatedInput,\n\t\t\t\terror: error instanceof Error ? error.message : String(error),\n\t\t\t\ttimestamp: Date.now(),\n\t\t\t});\n\n\t\t\tthrow error;\n\t\t}\n\t}\n\n\t/**\n\t * Execute a single step\n\t */\n\tprivate async executeStep(\n\t\tstep: Step,\n\t\tcontext: ExecutionContext,\n\t\tinputData: unknown,\n\t): Promise> {\n\t\tconst timestamp = Date.now();\n\n\t\ttry {\n\t\t\t// Validate input data at runtime\n\t\t\tconst validatedInput = step.inputSchema.parse(inputData);\n\n\t\t\t// Build step execution context\n\t\t\tconst stepContext: StepExecutionContext = {\n\t\t\t\tinputData: validatedInput,\n\t\t\t\tstate: context.state,\n\t\t\t\tsetState: (newState: TState) => {\n\t\t\t\t\tcontext.state = newState;\n\t\t\t\t},\n\t\t\t\tgetStepResult: >(targetStep: T) => {\n\t\t\t\t\tconst result = context.stepResults[targetStep.id];\n\t\t\t\t\tif (!result) {\n\t\t\t\t\t\tthrow new Error(`Step ${targetStep.id} has not been executed yet`);\n\t\t\t\t\t}\n\t\t\t\t\tif (result.status !== \"success\") {\n\t\t\t\t\t\tthrow new Error(\n\t\t\t\t\t\t\t`Step ${targetStep.id} did not complete successfully`,\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\t\t\t\t\treturn result.output;\n\t\t\t\t},\n\t\t\t\tgetInitData: () => context.inputData as any,\n\t\t\t\trunId: context.runId,\n\t\t\t\tworkflowId: context.workflowId,\n\t\t\t};\n\n\t\t\t// Execute the step\n\t\t\tconst output = await step.execute(stepContext);\n\n\t\t\t// Validate output at runtime\n\t\t\tconst validatedOutput = step.outputSchema.parse(output);\n\n\t\t\treturn {\n\t\t\t\tstatus: \"success\",\n\t\t\t\toutput: validatedOutput,\n\t\t\t\ttimestamp,\n\t\t\t};\n\t\t} catch (error) {\n\t\t\treturn {\n\t\t\t\tstatus: \"failed\",\n\t\t\t\terror: error instanceof Error ? error : new Error(String(error)),\n\t\t\t\ttimestamp,\n\t\t\t};\n\t\t}\n\t}\n}\n","deleted","label",[172,156],"backend","permalink","https://www.val.town/x/dk3/wrkflw/code/backend/engine.ts","extension","actionData","errors"]