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Smoothen event source parser by feeding in smaller chunks #151

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merged 4 commits into from
Feb 11, 2025
Merged

Smoothen event source parser by feeding in smaller chunks #151

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d5ce583
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ankrgyl Feb 11, 2025
eff2329
Undo most of it
ankrgyl Feb 11, 2025
9175e57
split lines
ankrgyl Feb 11, 2025
068c101
simplify
ankrgyl Feb 11, 2025
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25 changes: 20 additions & 5 deletions packages/proxy/src/proxy.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -328,12 +328,24 @@ export async function proxyV1({
stream = new ReadableStream<Uint8Array>({
start(controller) {
if ("body" in cachedData && cachedData.body) {
controller.enqueue(new TextEncoder().encode(cachedData.body));
for (const line of cachedData.body.split("\n")) {
controller.enqueue(new TextEncoder().encode(line));
}
} else if ("data" in cachedData && cachedData.data) {
const data = Buffer.from(cachedData.data, "base64");
const uint8Array = new Uint8Array(data);
controller.enqueue(uint8Array);
let start = 0;
for (let i = 0; i < data.length; i++) {
if (data[i] === 10) {
// 10 is ASCII/UTF-8 code for \n
controller.enqueue(data.subarray(start, i + 1));
start = i + 1;
}
}
if (start < data.length) {
controller.enqueue(data.subarray(start));
}
}

controller.close();
},
});
Expand Down Expand Up @@ -485,7 +497,6 @@ export async function proxyV1({
cacheKey,
JSON.stringify({ headers: proxyResponseHeaders, data: dataB64 }),
);
controller.terminate();
},
});

Expand Down Expand Up @@ -590,7 +601,11 @@ export async function proxyV1({
});
}
if (isStreaming) {
eventSourceParser?.feed(new TextDecoder().decode(chunk));
const start = Date.now();
let textChunks = new TextDecoder().decode(chunk);
eventSourceParser?.feed(textChunks);
const end = Date.now();
console.log(`time to feed ${chunk.length} bytes: ${end - start}ms`);
} else {
allChunks.push(chunk);
}
Expand Down