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readFileStream now respects backpressure more

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May 2023-12-23 15:10:55 -08:00
parent 7d18a60589
commit fd8e143e3b
1 changed files with 43 additions and 29 deletions
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72
src/server/lib/files.ts
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@ -106,9 +106,8 @@ async function startPushingWebStream(stream: Readable, webStream: ReadableStream
return reader.read().then(result => {
if (result.value)
stream.push(result.value)
pushing = false
return result.done
pushing = false
return {readyForMore: result.value ? stream.push(result.value) : false, streamDone: result.done }
})
}
}
@ -544,7 +543,7 @@ export default class Files {
let d = await fetch(scanning_chunk.url, {headers})
.catch((e: Error) => {
console.error(e)
return {body: "__ERR"}
return {body: e}
})
position++
@ -552,35 +551,50 @@ export default class Files {
return d.body
}
let ord: number[] = []
// hopefully this regulates it?
let lastChunkSent = true
let currentPusher : (() => Promise<{readyForMore: boolean, streamDone: boolean }> | undefined) | undefined
let busy = false
let pushWS : (stream: Readable) => Promise<boolean | undefined> = async (stream: Readable) => {
// uh oh, we don't have a currentPusher
// let's make one then
if (!currentPusher) {
let next = await getNextChunk()
if (next && !(next instanceof Error))
// okay, so we have a new chunk
// let's generate a new currentPusher
currentPusher = await startPushingWebStream(stream, next)
else {
// oops, look like there's an error
// or the stream has ended.
// let's destroy the stream
stream.destroy(next || undefined)
return
}
}
let result = await currentPusher()
if (result?.streamDone) currentPusher = undefined;
return result?.readyForMore
}
let dataStream = new Readable({
read() {
if (!lastChunkSent) return
lastChunkSent = false
getNextChunk().then(async (nextChunk) => {
if (typeof nextChunk == "string") {
this.destroy(new Error("file read error"))
return
}
async read() {
if (!nextChunk) return // EOF
if (busy) return
busy = true
let readyForMore = true
let response = await pushWebStream(this, nextChunk)
while (response) {
let nextChunk = await getNextChunk()
// idk why this line was below but i moved it on top
// hopefully it wasn't for some other weird reason
if (!nextChunk || typeof nextChunk == "string") return
response = await pushWebStream(this, nextChunk)
}
lastChunkSent = true
})
},
while (readyForMore) {
let result = await pushWS(this)
if (result === undefined) return // stream has been destroyed. nothing left to do...
readyForMore = result
}
busy = false
}
})
return dataStream