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import { buildPrompt } from "$lib/buildPrompt";
import { z } from "zod";
import type { Endpoint } from "../endpoints";
import type { TextGenerationStreamOutput } from "@huggingface/inference";
export const endpointLangserveParametersSchema = z.object({
weight: z.number().int().positive().default(1),
model: z.any(),
type: z.literal("langserve"),
url: z.string().url(),
});
export function endpointLangserve(
input: z.input<typeof endpointLangserveParametersSchema>
): Endpoint {
const { url, model } = endpointLangserveParametersSchema.parse(input);
return async ({ messages, preprompt, continueMessage }) => {
const prompt = await buildPrompt({
messages,
continueMessage,
preprompt,
model,
});
const r = await fetch(`${url}/stream`, {
method: "POST",
headers: {
"Content-Type": "application/json",
},
body: JSON.stringify({
input: { text: prompt },
}),
});
if (!r.ok) {
throw new Error(`Failed to generate text: ${await r.text()}`);
}
const encoder = new TextDecoderStream();
const reader = r.body?.pipeThrough(encoder).getReader();
return (async function* () {
let stop = false;
let generatedText = "";
let tokenId = 0;
let accumulatedData = ""; // Buffer to accumulate data chunks
while (!stop) {
// Read the stream and log the outputs to console
const out = (await reader?.read()) ?? { done: false, value: undefined };
// If it's done, we cancel
if (out.done) {
reader?.cancel();
return;
}
if (!out.value) {
return;
}
// Accumulate the data chunk
accumulatedData += out.value;
// Keep read data to check event type
const eventData = out.value;
// Process each complete JSON object in the accumulated data
while (accumulatedData.includes("\n")) {
// Assuming each JSON object ends with a newline
const endIndex = accumulatedData.indexOf("\n");
let jsonString = accumulatedData.substring(0, endIndex).trim();
// Remove the processed part from the buffer
accumulatedData = accumulatedData.substring(endIndex + 1);
// Stopping with end event
if (eventData.startsWith("event: end")) {
stop = true;
yield {
token: {
id: tokenId++,
text: "",
logprob: 0,
special: true,
},
generated_text: generatedText,
details: null,
} satisfies TextGenerationStreamOutput;
reader?.cancel();
continue;
}
if (eventData.startsWith("event: data") && jsonString.startsWith("data: ")) {
jsonString = jsonString.slice(6);
let data = null;
// Handle the parsed data
try {
data = JSON.parse(jsonString);
} catch (e) {
console.error("Failed to parse JSON", e);
console.error("Problematic JSON string:", jsonString);
continue; // Skip this iteration and try the next chunk
}
// Assuming content within data is a plain string
if (data) {
generatedText += data;
const output: TextGenerationStreamOutput = {
token: {
id: tokenId++,
text: data,
logprob: 0,
special: false,
},
generated_text: null,
details: null,
};
yield output;
}
}
}
}
})();
};
}
export default endpointLangserve;
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