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Copy pathFileCache.js
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188 lines (162 loc) · 5.41 KB
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importPromiseQueuefrom'./PromiseQueue.js'
import{JoinTypedArrays}from'./PopApi.js'
// cyclic include hmm
//import Pop from './PopEngine.js'
//const Debug = Pop.Debug;
functionDebug()
{
console.log(...arguments);
}
// this will become generic and not webapi specific
// we just need to abstract what IS webapi specific first
exportdefaultclassFileCache_t
{
constructor()
{
// we keep some meta on the side. eg. known size if we're streaming a file
// Do we leave this, even if we unload a file?
this.CacheMeta={};// [Filename] = .Size .OtherThings .LastAccessed?
this.Cache={};// [Filename] = Contents
this.OnFilesChanged=newPromiseQueue('FileCache.OnFilesChanged');
}
asyncWaitForFileChange()
{
// gr: we now return filename & contents, but we dont want to put the
// contents in the promise queue (will stop the unique-test and flood the queue)
// so we wait, grab it here, then return with current contents
constFilename=awaitthis.OnFilesChanged.WaitForNext();
constFile=Object.assign({},this.GetMeta(Filename));
File.Filename=Filename;
File.Contents=this.Cache[File.Filename];
returnFile;
}
// return a mutable meta object
GetMeta(Filename)
{
if(!this.CacheMeta[Filename])
this.CacheMeta[Filename]={};
returnthis.CacheMeta[Filename];
}
SetError(Filename,Error)
{
this.CacheMeta[Filename].Error=Error;
Debug(`Error loading file ${Filename}: ${Error}`);
this.Set(Filename,false);
}
Set(Filename,Contents,ContentChunks=undefined)
{
if(this.Cache.hasOwnProperty(Filename))
{
// Debug(`Warning overwriting AssetCache[${Filename}]`);
}
// if our content is in chunks, store them, then
// on request, join together
// expecting Contents to be null
//if ( ContentChunks )
// gr: always set chunks, so it gets unset
{
constMeta=this.GetMeta(Filename);
Meta.ContentChunks=ContentChunks;
// gr: I really don't want to store this meta as it can go out of date
// but if this is the ONLY place the chunks get updated, it can do for now
// Some systems (filemonitor) call GetMeta(), can't JUST have it in
// the OnChanged callback
if(Meta.ContentChunks===undefined)
{
Meta.PendingContentsSize=undefined;// not streaming(any more)
}
else
{
Meta.PendingContentsSize=0;
Meta.ContentChunks.forEach(Chunk=>Meta.PendingContentsSize+=Chunk.byteLength);
}
// update known size
if(Contents)
{
Meta.Size=Math.max(Contents.length,Meta.Size||0);
}
}
this.Cache[Filename]=Contents;
this.OnFilesChanged.PushUnique(Filename);
}
// call this before returning any contents, expecting called to have already
// verified it exists etc, and just re-setting the contents/cache
ResolveChunks(Filename)
{
constMeta=this.GetMeta(Filename);
if(!Meta.ContentChunks)
return;
// todo: store running Contents and only append new chunks
// so we minimise copies as the already-copied parts aren't going
// to change (in theory)
Debug(`Resolving x${Meta.ContentChunks.length} chunks of ${Filename}`);
this.Cache[Filename]=JoinTypedArrays(Meta.ContentChunks);
Meta.ContentChunks=null;
}
Get(Filename,ResolveChunks=true)
{
if(!this.Cache.hasOwnProperty(Filename))
{
throw`${Filename} has not been cached with AsyncCacheAsset()`;
}
// false is a file that failed to load
constAsset=this.Cache[Filename];
if(Asset===false)
{
constError=this.GetMeta(Filename).Error;
throw`${Filename} failed to load: ${Error}`;
}
// gr: send back chunks if they haven't been resolved
if(!ResolveChunks)
{
constMeta=this.GetMeta(Filename);
if(Meta.ContentChunks)
{
if(this.Cache[Filename]===false)
throw`We have chunks, but cache is false (error), shouldn't hit this combination, something has errored but we still have chunks (still downloading?)`;
//Debug(`Skipping chunk resolve of ${Filename} x${Meta.ContentChunks.length} chunks`);
returnMeta.ContentChunks;
}
}
// if there are pending content chunks, we need to join them together
// as it's the first time it's been requested
this.ResolveChunks(Filename);
returnthis.Cache[Filename];
}
// non-throwing function which returns false if the file load has errored
GetOrFalse(Filename,ResolveChunks=true)
{
if(!this.Cache.hasOwnProperty(Filename))
returnfalse;
// gr: send back chunks if they haven't been resolved
if(!ResolveChunks)
{
constMeta=this.GetMeta(Filename);
if(Meta.ContentChunks)
{
if(this.Cache[Filename]===false)
throw`We have chunks, but cache is false (error), shouldn't hit this combination, something has errored but we still have chunks (still downloading?)`;
//Debug(`Skipping chunk resolve of ${Filename} x${Meta.ContentChunks.length} chunks`);
returnMeta.ContentChunks;
}
}
// if there are pending content chunks, we need to join them together
// as it's the first time it's been requested
this.ResolveChunks(Filename);
// if this has failed to load, it will also be false
constAsset=this.Cache[Filename];
returnAsset;
}
IsCached(Filename)
{
// don't resolve chunks here, skip excess work for a simple "not false" check
constResolveChunks=false;
returnthis.GetOrFalse(Filename,ResolveChunks)!==false;
}
SetKnownSize(Filename,Size)
{
// update meta
constMeta=this.GetMeta(Filename);
Meta.Size=Size;
}
}