修复火山生图失败时跨服务商故障迁移

app/(chat)/api/chat/route.ts

@@ -2296,6 +2296,7 @@ export async function POST(request: Request) {
             const tryGenerateImage = async (modelIdToUse: string, isRetry: boolean) => {
               const result = await (languageModel as any).doGenerate({
                 messages: modelMessages,
+                imageParams: effectiveImageParams || { aspectRatio: "auto", imageSize: "2K", imageCount: 1 },
                 overrideModelId: isRetry ? modelIdToUse : undefined,
               });
               if (result?.finishReason === "error") {
@@ -2333,6 +2334,84 @@ export async function POST(request: Request) {
                   console.error(`[Chat API] ❌ Volcano fallback model ${fallbackModelId} failed:`, fallbackError);
                 }
               }
+              if (!fallbackSuccess) {
+                const providerPriority: Record<string, number> = {
+                  gemini: 0,
+                  "huanke-gemini": 1,
+                  "alibaba-image": 2,
+                  "ruxa-image": 3,
+                  "volcano-vision": 4,
+                };
+                const crossProviderCandidates = allModels
+                  .filter((m) => {
+                    if (!m.model.supportsImageGen || !m.model.isEnabled || m.model.isSubModel) {
+                      return false;
+                    }
+                    if (m.model.id === finalModelId) return false;
+                    if (m.provider.id === volcanoModelConfig?.providerId) return false;
+                    return true;
+                  })
+                  .sort((a, b) => {
+                    const left = providerPriority[a.provider.type as string] ?? 99;
+                    const right = providerPriority[b.provider.type as string] ?? 99;
+                    if (left !== right) return left - right;
+                    return (a.model.sortOrder ?? 0) - (b.model.sortOrder ?? 0);
+                  });
+
+                for (const candidate of crossProviderCandidates) {
+                  try {
+                    console.log(
+                      `[Chat API] 🔁 Volcano cross-provider failover attempt: ${candidate.model.displayName} (${candidate.provider.type})`
+                    );
+
+                    const candidateLanguageModel = await getLanguageModelById(candidate.model.id);
+                    if (!candidateLanguageModel || typeof (candidateLanguageModel as any).doGenerate !== "function") {
+                      console.log(`[Chat API] Skip candidate without doGenerate: ${candidate.model.id}`);
+                      continue;
+                    }
+
+                    const convertProvider =
+                      candidate.provider.type === "ruxa-image"
+                        ? "ruxa-image"
+                        : candidate.provider.type === "gemini"
+                          ? "gemini"
+                          : candidate.provider.type === "huanke-gemini"
+                            ? "huanke-gemini"
+                            : candidate.provider.type === "volcano-vision"
+                              ? "volcano"
+                              : "alibaba-image";
+
+                    const candidateMessages = await convertMessagesWithImages(
+                      messagesForVolcano,
+                      convertProvider
+                    );
+
+                    const candidateResult = await (candidateLanguageModel as any).doGenerate({
+                      messages: candidateMessages,
+                      imageParams: effectiveImageParams || { aspectRatio: "auto", imageSize: "2K", imageCount: 1 },
+                      modelDisplayName: candidate.model.displayName,
+                      overrideModelId: candidate.model.modelId,
+                    });
+
+                    if (candidateResult?.finishReason === "error") {
+                      throw new Error(candidateResult.text || "图片生成失败");
+                    }
+
+                    imageMarkdown = candidateResult.text || "图片生成失败";
+                    usedModelId = candidate.model.modelId;
+                    fallbackSuccess = true;
+                    console.log(
+                      `[Chat API] ✅ Volcano cross-provider failover succeeded: ${candidate.model.displayName} (${candidate.provider.type})`
+                    );
+                    break;
+                  } catch (crossError) {
+                    console.error(
+                      `[Chat API] ❌ Volcano cross-provider failover failed: ${candidate.model.displayName} (${candidate.provider.type})`,
+                      crossError
+                    );
+                  }
+                }
+              }
               if (!fallbackSuccess) {
                 throw primaryError;
               }