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Monorepo for Aesthetic.Computer aesthetic.computer
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758// Relay each provider chunk as soon as the consumer can accept it. Cancellation// travels back to fetch instead of leaving a paid generation running unseen.// `onUsage(tokens, usage)` fires once: weighted tokens, and the provider's own// usage block, whose `cost` (USD) OpenRouter reports in the final message_delta.export function relayInference(body, { onUsage = () => {}, abort = () => {}, onSettlementError = error => console.error("[aesel] usage settlement failed", error?.message || error), onFinish = () => {} } = {}) { const reader = body.getReader(); const decoder = new TextDecoder(); let tail = ""; let spent = 0; let accumulated = {}; let finished = false; let completion; function finish() { if (completion) return completion; finished = true; completion = Promise.resolve().then(() => onUsage(spent, accumulated)).catch(onSettlementError).finally(() => { reader.releaseLock(); onFinish(); }); return completion; } function meter(bytes) { tail += decoder.decode(bytes, { stream: true }); let cut; while ((cut = tail.indexOf("\n")) !== -1) { const line = tail.slice(0, cut).trim(); tail = tail.slice(cut + 1); if (!line.startsWith("data:")) continue; try { const json = JSON.parse(line.slice(5).trimStart()); const usage = json?.usage || json?.message?.usage; if (usage) { accumulated = { ...accumulated, ...usage }; spent = (accumulated.input_tokens || 0) + (accumulated.output_tokens || 0) + Math.round((accumulated.cache_read_input_tokens || 0) * 0.1) + Math.round((accumulated.cache_creation_input_tokens || 0) * 1.25); } } catch {} } // A malformed provider must not accumulate an unbounded unterminated line. if (tail.length > 1_048_576) tail = ""; } return new ReadableStream({ async pull(controller) { try { const { done, value } = await reader.read(); if (finished) return; if (done) { await finish(); controller.close(); return; } meter(value); controller.enqueue(value); } catch (error) { if (!finished) { await finish(); controller.error(error); } } }, async cancel(reason) { abort(reason); try { await reader.cancel(reason); } finally { await finish(); } }, });}