eve/dist/src/execution/session/handoff.js

Filesystem-first framework for durable backend AI agents that run anywhere.

import{sessionHandoffMarkerToken}from"#execution/session-inbox/address.js";import{startSessionOwnerStep}from"#execution/workflow-runtime.js";import{createHook,getWorkflowMetadata}from"#compiled/@workflow/core/index.js";import{claimHookOwnership,disposeHook}from"#execution/hook-ownership.js";import{sessionHookTokens}from"#execution/session/hook-tokens.js";import{isSessionIdleForHandoffStep}from"#execution/session/handoff-steps.js";import{readAcceptedDeploymentId}from"#execution/session/accepted-deployment.js";const SESSION_CHECKPOINT_VERSION=7;function sessionAnchorToken(e){return`${e}:anchor`}var SessionHandoff=class{input;anchor;constructor(e){this.input=e}async tryTransfer(e,t){let{deploymentId:n,inbox:r}=this.input,i=readAcceptedDeploymentId(e.delivery);if(i===void 0)return{kind:`retained`,reason:`missing-deployment`};if(i===n)return{kind:`retained`,reason:`same-deployment`};if(!e.handoffEligible)return{kind:`retained`,reason:`busy`};if(!await isSessionIdleForHandoffStep(t))return{kind:`retained`,reason:`not-idle`};let a={...this.input.checkpoint,...t,version:7},o=sessionHookTokens(t);await this.ensureAnchor();let s=o.map(e=>createHook({token:sessionHandoffMarkerToken(e)}));await Promise.all(s.map(e=>claimHookOwnership(e)));try{let t=await r.release();if(t.length>0)return await this.recover(o,t),{kind:`retained`,reason:`accepted-during-release`};let n=[];try{let t=await this.startAndActivate(a,e.delivery,i);if(t.kind===`active`)return{kind:`transferred`};n=t.payloads}catch{}return await this.recover(o,n),{kind:`retained`,reason:`activation-failed`}}finally{await Promise.all(s.map(e=>disposeHook(e)))}}async awaitAnchoredResult(){if(this.anchor===void 0)throw Error(`Session anchor was never claimed.`);try{return await this.anchor}finally{await this.disposeAnchor()}}async disposeAnchor(){if(this.anchor===void 0)return;let e=this.anchor;this.anchor=void 0,await disposeHook(e)}async startAndActivate(e,t,n){let r=createHook({token:`${getWorkflowMetadata().workflowRunId}:handoff`});await claimHookOwnership(r);try{return await startSessionOwnerStep({activationToken:r.token,anchorRunId:this.input.sessionId,checkpoint:e,delivery:t,targetDeploymentId:n}),await r}finally{await disposeHook(r)}}async recover(e,t){await this.input.inbox.claimSessionHooks(e),this.input.inbox.restore(t)}async ensureAnchor(){this.input.isInitialOwner&&this.anchor===void 0&&(this.anchor=createHook({token:sessionAnchorToken(this.input.sessionId)}),await claimHookOwnership(this.anchor))}};export{SESSION_CHECKPOINT_VERSION,SessionHandoff,sessionAnchorToken};