19 lines
3.0 KiB
JavaScript
19 lines
3.0 KiB
JavaScript
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'use strict';
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// Restoration creates managed native tabs; it never imports renderer pageState.
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async function restoreNativeSession(tabs,{activeIndex,signal,assertCurrent,revision,owner},{registry,store,create,activate,traceOperation=async(_name,fn)=>fn()}={}){
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if(!Array.isArray(tabs)||!tabs.length||tabs.length>32||!Number.isInteger(activeIndex)||activeIndex<0||activeIndex>=tabs.length||typeof assertCurrent!=='function')throw Error('Invalid managed session restore');
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const originals=registry.all().map(tab=>({id:tab.id,contents:tab.contents})),initialActive=registry.active()?.id,created=[];let expectedActive=initialActive;const epoch=()=>{const value=registry.context(registry.active()?.id,{foreground:true}).activation;if(!Number.isSafeInteger(value)||value<0)throw Error('Managed restore activation unavailable');return value;};let expectedEpoch=epoch();const ownActivation=id=>{const next=epoch(),required=expectedEpoch+(id===expectedActive?0:1);if(next!==required||registry.active()?.id!==id)throw Error('Managed restore activation changed');expectedActive=id;expectedEpoch=next;};
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const current=()=>{
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assertCurrent();if(signal?.aborted||store.list(owner).revision!==revision||registry.all().length!==originals.length+created.length||registry.active()?.id!==expectedActive||epoch()!==expectedEpoch)throw Error('Managed restore context changed');
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for(const row of [...originals,...created])if(registry.get(row.id).contents!==row.contents||row.contents.isDestroyed())throw Error('Managed restore tab changed');
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};
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await traceOperation('preflight',()=>{current();if(originals.length+tabs.length>32)throw Error('Native tab capacity reached');});
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try{
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for(const tab of tabs){current();const result=await traceOperation('native',()=>create({url:tab.url,...(tab.group?{group:tab.group}:{})},{signal,assertCurrent:current,onCreated:native=>{if(!native||originals.some(row=>row.id===native.id)||created.some(row=>row.id===native.id)||!registry.all().some(row=>row.id===native.id&&row.contents===native.contents))throw Error('Managed restore ownership mismatch');created.push({id:native.id,contents:native.contents});},onActivated:native=>ownActivation(native.id)}));current();if(result!==created.at(-1)?.id)throw Error('Managed restore tab mismatch');}
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current();activate(created[activeIndex].id);ownActivation(created[activeIndex].id);current();return {completed:true,sessionIds:created.map(row=>row.id),activeSessionId:expectedActive};
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}catch(error){
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// Closing owned tabs cannot undo network requests already sent before failure.
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let rollbackFailed=false;await traceOperation('rollback',()=>{for(const row of [...created].reverse()){try{if(registry.all().some(tab=>tab.id===row.id&&tab.contents===row.contents))registry.remove(row.id);}catch{rollbackFailed=true;}}try{if(initialActive&®istry.all().some(tab=>tab.id===initialActive&&!tab.contents.isDestroyed()))activate(initialActive);}catch{rollbackFailed=true;}});if(rollbackFailed)throw Error('Managed session rollback incomplete',{cause:error});throw error;
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}
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}
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module.exports={restoreNativeSession};
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