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import { ToolCall } from "../../chat/Tool.js";
import { Capabilities } from "./Capabilities.js";
import { handleGeminiError } from "./Errors.js";
import { GeminiGenerateContentResponse } from "./types.js";
import { GeminiChatUtils } from "./ChatUtils.js";
import { logger } from "../../utils/logger.js";
import { fetchWithTimeout } from "../../utils/fetch.js";
export class GeminiStreaming {
constructor(
private readonly baseUrl: string,
private readonly apiKey: string
) {}
async *execute(request: ChatRequest, controller?: AbortController): AsyncGenerator<ChatChunk> {
const abortController = controller || new AbortController();
const temperature = Capabilities.normalizeTemperature(request.temperature, request.model);
const url = `${this.baseUrl}/models/${request.model}:streamGenerateContent?alt=sse&key=${this.apiKey}`;
const { contents, systemInstructionParts } = await GeminiChatUtils.convertMessages(
request.messages
);
const generationConfig: Record<string, unknown> = {
temperature: temperature ?? undefined,
maxOutputTokens: request.max_tokens
};
if (request.response_format?.type === "json_object") {
generationConfig.responseMimeType = "application/json";
} else if (request.response_format?.type === "json_schema") {
generationConfig.responseMimeType = "application/json";
Eif (request.response_format.json_schema?.schema) {
generationConfig.responseSchema = this.sanitizeSchema(
request.response_format.json_schema.schema
);
}
}
const {
model: _model,
messages: _messages,
tools: _tools,
temperature: _temp,
max_tokens: _max,
response_format: _format,
headers: _headers,
requestTimeout: _requestTimeout,
thinking: _thinking,
...rest
} = request;
const payload: Record<string, unknown> = {
contents,
generationConfig: {
...generationConfig,
...((rest.generationConfig as Record<string, unknown>) || {})
},
...rest
};
if (_thinking) {
payload.thinkingConfig = {
includeThoughts: true
};
}
Iif (systemInstructionParts.length > 0) {
payload.systemInstruction = { parts: systemInstructionParts };
}
if (request.tools && request.tools.length > 0) {
payload.tools = [
{
functionDeclarations: request.tools.map((t) => ({
name: t.function.name,
description: t.function.description,
parameters: t.function.parameters
}))
}
];
}
let done = false;
const toolCalls: ToolCall[] = [];
try {
logger.logRequest("Gemini", "POST", url, payload);
const response = await fetchWithTimeout(
url,
{
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify(payload),
signal: abortController.signal
},
request.requestTimeout
);
if (!response.ok) {
await handleGeminiError(response, request.model);
}
logger.debug("Gemini streaming started", {
status: response.status,
statusText: response.statusText
});
if (!response.body) {
throw new Error("No response body for streaming");
}
const reader = response.body.getReader();
const decoder = new TextDecoder();
let buffer = "";
while (true) {
const { value, done: readerDone } = await reader.read();
if (readerDone) {
// Yield tool calls if any were collected
if (toolCalls.length > 0) {
yield { content: "", tool_calls: toolCalls, done: true };
}
break;
}
buffer += decoder.decode(value, { stream: true });
let lineEnd;
while ((lineEnd = buffer.indexOf("\n")) !== -1) {
let line = buffer.substring(0, lineEnd).trim();
buffer = buffer.substring(lineEnd + 1);
// Handle carriage returns
Iif (line.endsWith("\r")) {
line = line.substring(0, line.length - 1);
}
if (line.startsWith("data: ")) {
const data = line.substring(6).trim();
Iif (!data) continue;
try {
const json = JSON.parse(data) as GeminiGenerateContentResponse;
const parts = json.candidates?.[0]?.content?.parts || [];
for (const part of parts) {
if (part.text) {
if (part.thought) {
yield { content: "", thinking: { text: part.text } };
} else {
yield { content: part.text };
}
}
// Handle function calls
if (part.functionCall) {
toolCalls.push({
id: part.functionCall.name, // Gemini uses name as ID
type: "function" as const,
function: {
name: part.functionCall.name,
arguments: JSON.stringify(part.functionCall.args || {})
}
});
}
}
} catch {
// Ignore parse errors
}
}
}
}
done = true;
} catch (e) {
// Graceful exit on abort
if (e instanceof Error && e.name === "AbortError") {
return;
}
throw e;
} finally {
// Cleanup: abort if user breaks early
if (!done) {
abortController.abort();
}
}
}
private sanitizeSchema(schema: unknown): unknown {
Iif (typeof schema !== "object" || schema === null) return schema;
const sanitized = { ...(schema as Record<string, unknown>) };
// Remove unsupported fields
delete sanitized.additionalProperties;
delete sanitized.$schema;
delete sanitized.$id;
delete sanitized.definitions;
// Recursively sanitize
if (sanitized.properties && typeof sanitized.properties === "object") {
const props = sanitized.properties as Record<string, unknown>;
for (const key in props) {
props[key] = this.sanitizeSchema(props[key]);
}
}
Iif (sanitized.items) {
sanitized.items = this.sanitizeSchema(sanitized.items);
}
return sanitized;
}
}
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