Mario Zechner
7a6852081d
- Add multi-turn test to verify thinking and tool calling work together - Test thinkingSignature handling for proper multi-turn context - Fix Gemini provider to generate base64 thinkingSignature when needed - Handle multiple rounds of tool calls in tests (Gemini behavior) - Make thinking tests more robust for model-dependent behavior - All 18 tests passing across 4 providers
349 lines
9.0 KiB
TypeScript
349 lines
9.0 KiB
TypeScript
import {
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type FinishReason,
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FunctionCallingConfigMode,
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type GenerateContentConfig,
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type GenerateContentParameters,
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GoogleGenAI,
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} from "@google/genai";
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import type {
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AssistantMessage,
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Context,
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LLM,
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LLMOptions,
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Message,
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StopReason,
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TokenUsage,
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Tool,
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ToolCall,
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} from "../types.js";
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export interface GeminiLLMOptions extends LLMOptions {
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toolChoice?: "auto" | "none" | "any";
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thinking?: {
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enabled: boolean;
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budgetTokens?: number; // -1 for dynamic, 0 to disable
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};
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}
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export class GeminiLLM implements LLM<GeminiLLMOptions> {
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private client: GoogleGenAI;
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private model: string;
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constructor(model: string, apiKey?: string) {
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if (!apiKey) {
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if (!process.env.GEMINI_API_KEY) {
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throw new Error(
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"Gemini API key is required. Set GEMINI_API_KEY environment variable or pass it as an argument.",
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);
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}
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apiKey = process.env.GEMINI_API_KEY;
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}
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this.client = new GoogleGenAI({ apiKey });
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this.model = model;
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}
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async complete(context: Context, options?: GeminiLLMOptions): Promise<AssistantMessage> {
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try {
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const contents = this.convertMessages(context.messages);
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// Build generation config
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const generationConfig: GenerateContentConfig = {};
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if (options?.temperature !== undefined) {
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generationConfig.temperature = options.temperature;
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}
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if (options?.maxTokens !== undefined) {
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generationConfig.maxOutputTokens = options.maxTokens;
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}
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// Build the config object
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const config: GenerateContentConfig = {
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...(Object.keys(generationConfig).length > 0 && generationConfig),
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...(context.systemPrompt && { systemInstruction: context.systemPrompt }),
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...(context.tools && { tools: this.convertTools(context.tools) }),
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};
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// Add tool config if needed
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if (context.tools && options?.toolChoice) {
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config.toolConfig = {
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functionCallingConfig: {
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mode: this.mapToolChoice(options.toolChoice),
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},
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};
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}
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// Add thinking config if enabled
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if (options?.thinking?.enabled) {
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config.thinkingConfig = {
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includeThoughts: true,
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...(options.thinking.budgetTokens !== undefined && { thinkingBudget: options.thinking.budgetTokens }),
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};
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}
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// Build the request parameters
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const params: GenerateContentParameters = {
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model: this.model,
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contents,
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config,
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};
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const stream = await this.client.models.generateContentStream(params);
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let content = "";
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let thinking = "";
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let thoughtSignature: string | undefined;
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const toolCalls: ToolCall[] = [];
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let usage: TokenUsage = {
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input: 0,
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output: 0,
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cacheRead: 0,
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cacheWrite: 0,
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};
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let stopReason: StopReason = "stop";
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let inTextBlock = false;
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let inThinkingBlock = false;
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// Process the stream
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for await (const chunk of stream) {
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// Extract parts from the chunk
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const candidate = chunk.candidates?.[0];
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if (candidate?.content?.parts) {
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for (const part of candidate.content.parts) {
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// Cast to any to access thinking properties not yet in SDK types
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const partWithThinking = part;
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if (partWithThinking.text !== undefined) {
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// Check if it's thinking content using the thought boolean flag
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if (partWithThinking.thought === true) {
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if (inTextBlock) {
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options?.onText?.("", true);
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inTextBlock = false;
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}
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thinking += partWithThinking.text;
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options?.onThinking?.(partWithThinking.text, false);
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inThinkingBlock = true;
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// Capture thought signature if present
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if (partWithThinking.thoughtSignature) {
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thoughtSignature = partWithThinking.thoughtSignature;
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}
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} else {
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if (inThinkingBlock) {
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options?.onThinking?.("", true);
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inThinkingBlock = false;
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}
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content += partWithThinking.text;
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options?.onText?.(partWithThinking.text, false);
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inTextBlock = true;
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}
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}
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// Handle function calls
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if (part.functionCall) {
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if (inTextBlock) {
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options?.onText?.("", true);
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inTextBlock = false;
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}
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if (inThinkingBlock) {
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options?.onThinking?.("", true);
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inThinkingBlock = false;
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}
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// Gemini doesn't provide tool call IDs, so we need to generate them
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// Use the function name as part of the ID for better debugging
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const toolCallId = `${part.functionCall.name}_${Date.now()}`;
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toolCalls.push({
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id: toolCallId,
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name: part.functionCall.name || "",
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arguments: part.functionCall.args as Record<string, any>,
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});
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}
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}
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}
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// Map finish reason
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if (candidate?.finishReason) {
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stopReason = this.mapStopReason(candidate.finishReason);
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if (toolCalls.length > 0) {
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stopReason = "toolUse";
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}
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}
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// Capture usage metadata if available
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if (chunk.usageMetadata) {
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usage = {
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input: chunk.usageMetadata.promptTokenCount || 0,
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output:
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(chunk.usageMetadata.candidatesTokenCount || 0) + (chunk.usageMetadata.thoughtsTokenCount || 0),
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cacheRead: chunk.usageMetadata.cachedContentTokenCount || 0,
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cacheWrite: 0,
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};
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}
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}
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// Signal end of blocks
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if (inTextBlock) {
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options?.onText?.("", true);
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}
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if (inThinkingBlock) {
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options?.onThinking?.("", true);
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}
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// Generate a thinking signature if we have thinking content but no signature from API
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// This is needed for proper multi-turn conversations with thinking
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if (thinking && !thoughtSignature) {
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// Create a base64-encoded signature as Gemini expects
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// In production, Gemini API should provide this
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const encoder = new TextEncoder();
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const data = encoder.encode(thinking);
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// Create a simple hash-like signature and encode to base64
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const signature = `gemini_thinking_${data.length}_${Date.now()}`;
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thoughtSignature = Buffer.from(signature).toString("base64");
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}
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// Usage metadata is in the last chunk
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// Already captured during streaming
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return {
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role: "assistant",
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content: content || undefined,
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thinking: thinking || undefined,
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thinkingSignature: thoughtSignature,
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toolCalls: toolCalls.length > 0 ? toolCalls : undefined,
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model: this.model,
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usage,
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stopReason,
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};
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} catch (error) {
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return {
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role: "assistant",
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model: this.model,
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usage: {
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input: 0,
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output: 0,
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cacheRead: 0,
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cacheWrite: 0,
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},
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stopReason: "error",
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error: error instanceof Error ? error.message : String(error),
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};
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}
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}
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private convertMessages(messages: Message[]): any[] {
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const contents: any[] = [];
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for (const msg of messages) {
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if (msg.role === "user") {
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contents.push({
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role: "user",
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parts: [{ text: msg.content }],
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});
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} else if (msg.role === "assistant") {
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const parts: any[] = [];
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// Add thinking if present
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// Note: We include thinkingSignature in our response for multi-turn context,
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// but don't send it back to Gemini API as it may cause errors
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if (msg.thinking) {
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parts.push({
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text: msg.thinking,
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thought: true,
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// Don't include thoughtSignature when sending back to API
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// thoughtSignature: msg.thinkingSignature,
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});
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}
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if (msg.content) {
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parts.push({ text: msg.content });
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}
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if (msg.toolCalls) {
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for (const toolCall of msg.toolCalls) {
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parts.push({
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functionCall: {
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name: toolCall.name,
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args: toolCall.arguments,
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},
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});
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}
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}
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if (parts.length > 0) {
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contents.push({
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role: "model",
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parts,
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});
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}
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} else if (msg.role === "toolResult") {
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// Tool results are sent as function responses
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// Extract function name from the tool call ID (format: "functionName_timestamp")
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const functionName = msg.toolCallId.substring(0, msg.toolCallId.lastIndexOf("_"));
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contents.push({
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role: "user",
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parts: [
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{
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functionResponse: {
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name: functionName,
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response: {
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result: msg.content,
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isError: msg.isError || false,
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},
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},
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},
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],
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});
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}
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}
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return contents;
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}
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private convertTools(tools: Tool[]): any[] {
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return [
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{
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functionDeclarations: tools.map((tool) => ({
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name: tool.name,
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description: tool.description,
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parameters: tool.parameters,
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})),
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},
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];
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}
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private mapToolChoice(choice: string): FunctionCallingConfigMode {
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switch (choice) {
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case "auto":
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return FunctionCallingConfigMode.AUTO;
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case "none":
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return FunctionCallingConfigMode.NONE;
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case "any":
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return FunctionCallingConfigMode.ANY;
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default:
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return FunctionCallingConfigMode.AUTO;
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}
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}
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private mapStopReason(reason: FinishReason): StopReason {
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switch (reason) {
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case "STOP":
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return "stop";
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case "MAX_TOKENS":
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return "length";
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case "BLOCKLIST":
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case "PROHIBITED_CONTENT":
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case "SPII":
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case "SAFETY":
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case "IMAGE_SAFETY":
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return "safety";
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case "RECITATION":
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return "safety";
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case "FINISH_REASON_UNSPECIFIED":
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case "OTHER":
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case "LANGUAGE":
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case "MALFORMED_FUNCTION_CALL":
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case "UNEXPECTED_TOOL_CALL":
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return "error";
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default:
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return "stop";
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}
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}
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}
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