94 lines
3 KiB
JavaScript
94 lines
3 KiB
JavaScript
/**
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* Shared combo (model combo) handling with fallback support
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*/
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import { checkFallbackError } from "./accountFallback.js";
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/**
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* Get combo models from combos data
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* @param {string} modelStr - Model string to check
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* @param {Array|Object} combosData - Array of combos or object with combos
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* @returns {string[]|null} Array of models or null if not a combo
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*/
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export function getComboModelsFromData(modelStr, combosData) {
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// Don't check if it's in provider/model format
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if (modelStr.includes("/")) return null;
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// Handle both array and object formats
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const combos = Array.isArray(combosData) ? combosData : (combosData?.combos || []);
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const combo = combos.find(c => c.name === modelStr);
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if (combo && combo.models && combo.models.length > 0) {
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return combo.models;
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}
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return null;
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}
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/**
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* Handle combo chat with fallback
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* @param {Object} options
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* @param {Object} options.body - Request body
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* @param {string[]} options.models - Array of model strings to try
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* @param {Function} options.handleSingleModel - Function to handle single model: (body, modelStr) => Promise<Response>
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* @param {Object} options.log - Logger object
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* @returns {Promise<Response>}
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*/
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export async function handleComboChat({ body, models, handleSingleModel, log }) {
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let lastError = null;
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for (let i = 0; i < models.length; i++) {
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const modelStr = models[i];
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log.info("COMBO", `Trying model ${i + 1}/${models.length}: ${modelStr}`);
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const result = await handleSingleModel(body, modelStr);
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// Success (2xx) - return response
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if (result.ok) {
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log.info("COMBO", `Model ${modelStr} succeeded`);
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return result;
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}
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// Extract error message from response
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let errorText = result.statusText || "";
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try {
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const errorBody = await result.clone().json();
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errorText = errorBody?.error ?? errorBody?.message ?? errorText;
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} catch {
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// Ignore JSON parse errors
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}
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// Normalize error text to string (Worker-safe)
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if (typeof errorText !== "string") {
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try {
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errorText = JSON.stringify(errorText);
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} catch {
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errorText = String(errorText);
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}
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}
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// Check if should fallback to next model
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const { shouldFallback } = checkFallbackError(result.status, errorText);
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if (!shouldFallback) {
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// Don't fallback - return error immediately (e.g. 401 auth errors)
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log.warn("COMBO", `Model ${modelStr} failed (no fallback)`, { status: result.status });
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return result;
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}
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// Fallback to next model
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lastError = `${modelStr}: ${errorText || result.status}`;
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log.warn("COMBO", `Model ${modelStr} failed, trying next`, { status: result.status, error: errorText.slice(0, 100) });
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}
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log.warn("COMBO", "All combo models failed");
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// Return 503 with last error
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return new Response(
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JSON.stringify({ error: lastError || "All combo models unavailable" }),
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{
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status: 503,
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headers: { "Content-Type": "application/json" }
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}
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);
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}
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