eve
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Filesystem-first framework for durable backend AI agents that run anywhere.
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JavaScript
import{coalesceDeliveries}from"#harness/messages.js";import{readSerializedSubagentDepth}from"#harness/subagent-depth.js";import{createHook,getWorkflowMetadata,getWritable}from"#compiled/@workflow/core/index.js";import{disposeHook}from"#execution/hook-ownership.js";import{normalizeSerializableError}from"#execution/workflow-errors.js";import{routeDeliverToChildren}from"#execution/route-child-delivery.js";import{readChannelRequestId,readRootSessionId}from"#execution/eve-workflow-attributes.js";import{notifyDelegatedParentStep}from"#execution/delegated-parent-notification.js";import{createDelegatedSubagentErrorResult,createDelegatedSubagentSuccessResult}from"#execution/delegated-parent-result.js";import{dispatchAndAwaitTurn}from"#execution/turn-dispatch.js";import{createSessionStep}from"#execution/create-session-step.js";import{settleCancelledTurnStep}from"#execution/settle-cancelled-turn-step.js";import{emitTerminalSessionFailureStep}from"#execution/terminal-session-failure-step.js";import{fireSessionCallbackStep}from"#execution/session-callback-step.js";import{createSessionDeliveryHook}from"#execution/session-delivery-hook.js";async function workflowEntry(e){"use workflow";let{workflowRunId:n}=getWorkflowMetadata(),a=e.serializedContext[`eve.continuationToken`]||``,s=e.serializedContext[`eve.mode`],u=e.serializedContext[`eve.capabilities`],d=e.serializedContext[`eve.bundle`];e.serializedContext[`eve.sessionId`]=n;let f=getWritable();try{let r=readRootSessionId(e.serializedContext),i=readSerializedSubagentDepth(e.serializedContext),{state:o}=await createSessionStep({compiledArtifactsSource:d.source,continuationToken:a,inheritedLimits:e.limits,nodeId:d.nodeId,outputSchema:e.input.outputSchema,rootSessionId:r,sessionId:n,subagentDepth:i});return await runDriverLoop({capabilities:u,driverWritable:f,initialInput:{kind:`deliver`,payloads:[{message:e.input.message,context:e.input.context,outputSchema:e.input.outputSchema}],requestId:readChannelRequestId(e.serializedContext)},mode:s,serializedContext:e.serializedContext,sessionState:o})}catch(t){throw await emitTerminalSessionFailureStep({error:normalizeSerializableError(t),parentWritable:f,serializedContext:e.serializedContext}),await fireSessionCallbackStep({error:normalizeSerializableError(t),serializedContext:e.serializedContext,status:`failed`}),await notifyDelegatedParentStep({result:createDelegatedSubagentErrorResult(e.serializedContext,t),serializedContext:e.serializedContext}),createSafeOuterWorkflowError()}}function createSafeOuterWorkflowError(){let e=Error(`Agent workflow failed. Inspect the private session trace for details.`);return e.name=`EveWorkflowFailure`,e}async function runDriverLoop(e){let t=createHook({token:`${e.sessionState.sessionId}:auth`}),r=t[Symbol.asyncIterator](),i=0,nextTurnControlToken=()=>`${e.sessionState.sessionId}:turn-control:${String(i++)}`,o=[],c=createSessionDeliveryHook(o),l,runTurn=async t=>{let n=await dispatchAndAwaitTurn({bufferedDeliveries:o,capabilities:e.capabilities,controlToken:nextTurnControlToken(),delivery:t.delivery,deliveryHook:c,mode:e.mode,parentWritable:e.driverWritable,serializedContext:t.serializedContext,sessionState:t.sessionState});return await l?.(),l=n.dispose,n.action};try{e.sessionState.continuationToken&&await c.rekey(e.sessionState.continuationToken);let t=await runTurn({delivery:e.initialInput,serializedContext:e.serializedContext,sessionState:e.sessionState});for(;;){if(t.kind===`done`)return await finalizeDone({action:t,driverWritable:e.driverWritable});if(t.kind!==`park`)throw Error(`Driver received unexpected turn action "${t.kind}".`);if(t.cancelled===!0){let n=await settleCancelledTurnStep({parentWritable:e.driverWritable,serializedContext:t.serializedContext,sessionState:t.sessionState});t={...t,serializedContext:n.serializedContext,sessionState:n.sessionState}}if(!t.sessionState.continuationToken)throw Error("Cannot park: no continuation token available. The channel must post the first message during the initial turn (anchoring the session) or `send()` must be called with an explicit continuationToken.");if(await c.rekey(t.sessionState.continuationToken),t.authorizationNames&&t.authorizationNames.length>0){let e=t.authorizationNames.length,n=[];for(;n.length<e;){let e=await r.next();if(e.done)break;e.value.kind===`deliver`&&n.push(...e.value.payloads)}t=await runTurn({delivery:{kind:`deliver`,payloads:n},serializedContext:t.serializedContext,sessionState:t.sessionState});continue}let n=await waitForNextDeliver({bufferedDeliveries:o,deliveryHook:c});if(n===null)return{output:``};let i=await routeDeliverToChildren({auth:n.auth,parentWritable:e.driverWritable,payloads:n.payloads,sessionState:t.sessionState});i!==void 0&&(t=await runTurn({delivery:{auth:n.auth,kind:`deliver`,payloads:[i],requestId:n.requestId},serializedContext:t.serializedContext,sessionState:t.sessionState}))}}finally{await l?.(),await c.dispose(),await disposeHook(t)}}async function finalizeDone(e){let{output:t,serializedContext:n}=e.action,r=e.action.isError===!0;return await fireSessionCallbackStep({error:r?t:void 0,output:r?void 0:t,serializedContext:n,status:r?`failed`:`completed`,usage:r?void 0:e.action.usage}),await notifyDelegatedParentStep({result:r?createDelegatedSubagentErrorResult(n,t):createDelegatedSubagentSuccessResult(n,t),serializedContext:n,usage:r?void 0:e.action.usage}),{output:t}}async function waitForNextDeliver(t){if(t.bufferedDeliveries.length>0)return coalesceDeliveries(t.bufferedDeliveries.splice(0));for(;;){let n=await t.deliveryHook.next();if(t.deliveryHook.consumeNext(),n.done)return null;if(n.value.kind!==`deliver`)continue;let r=n.value;for(;;){let n=await takeReadyPayload(t.deliveryHook.next());if(n===NO_READY_MESSAGE||(t.deliveryHook.consumeNext(),n.done))break;n.value.kind===`deliver`&&(r=coalesceDeliveries([r,n.value]))}return r}}const NO_READY_MESSAGE=Symbol(`no-ready-message`);async function takeReadyPayload(e){return await Promise.resolve(),await Promise.race([e,Promise.resolve(NO_READY_MESSAGE)])}export{workflowEntry};