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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { OAuth2Client } from 'google-auth-library';
import {
LoadCodeAssistResponse,
LoadCodeAssistRequest,
OnboardUserRequest,
LongrunningOperationResponse,
} from './types.js';
import {
GenerateContentResponse,
GenerateContentParameters,
CountTokensParameters,
EmbedContentResponse,
CountTokensResponse,
EmbedContentParameters,
} from '@google/genai';
import * as readline from 'readline';
import { ContentGenerator } from '../core/contentGenerator.js';
import {
CaGenerateContentResponse,
toGenerateContentRequest,
fromGenerateContentResponse,
toCountTokenRequest,
fromCountTokenResponse,
CaCountTokenResponse,
} from './converter.js';
import { PassThrough } from 'node:stream';
/** HTTP options to be used in each of the requests. */
export interface HttpOptions {
/** Additional HTTP headers to be sent with the request. */
headers?: Record<string, string>;
}
// TODO: Use production endpoint once it supports our methods.
export const CODE_ASSIST_ENDPOINT =
process.env.CODE_ASSIST_ENDPOINT ??
'https://staging-cloudcode-pa.sandbox.googleapis.com';
export const CODE_ASSIST_API_VERSION = 'v1internal';
export class CodeAssistServer implements ContentGenerator {
constructor(
readonly auth: OAuth2Client,
readonly projectId?: string,
readonly httpOptions: HttpOptions = {},
) {}
async generateContentStream(
req: GenerateContentParameters,
): Promise<AsyncGenerator<GenerateContentResponse>> {
const resps = await this.streamEndpoint<CaGenerateContentResponse>(
'streamGenerateContent',
toGenerateContentRequest(req, this.projectId),
req.config?.abortSignal,
);
return (async function* (): AsyncGenerator<GenerateContentResponse> {
for await (const resp of resps) {
yield fromGenerateContentResponse(resp);
}
})();
}
async generateContent(
req: GenerateContentParameters,
): Promise<GenerateContentResponse> {
const resp = await this.callEndpoint<CaGenerateContentResponse>(
'generateContent',
toGenerateContentRequest(req, this.projectId),
req.config?.abortSignal,
);
return fromGenerateContentResponse(resp);
}
async onboardUser(
req: OnboardUserRequest,
): Promise<LongrunningOperationResponse> {
return await this.callEndpoint<LongrunningOperationResponse>(
'onboardUser',
req,
);
}
async loadCodeAssist(
req: LoadCodeAssistRequest,
): Promise<LoadCodeAssistResponse> {
return await this.callEndpoint<LoadCodeAssistResponse>(
'loadCodeAssist',
req,
);
}
async countTokens(req: CountTokensParameters): Promise<CountTokensResponse> {
const resp = await this.callEndpoint<CaCountTokenResponse>(
'countTokens',
toCountTokenRequest(req),
);
return fromCountTokenResponse(resp);
}
async embedContent(
_req: EmbedContentParameters,
): Promise<EmbedContentResponse> {
throw Error();
}
async callEndpoint<T>(
method: string,
req: object,
signal?: AbortSignal,
): Promise<T> {
const res = await this.auth.request({
url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${method}`,
method: 'POST',
headers: {
'Content-Type': 'application/json',
...this.httpOptions.headers,
},
responseType: 'json',
body: JSON.stringify(req),
signal,
});
return res.data as T;
}
async streamEndpoint<T>(
method: string,
req: object,
signal?: AbortSignal,
): Promise<AsyncGenerator<T>> {
const res = await this.auth.request({
url: `${CODE_ASSIST_ENDPOINT}/${CODE_ASSIST_API_VERSION}:${method}`,
method: 'POST',
params: {
alt: 'sse',
},
headers: {
'Content-Type': 'application/json',
...this.httpOptions.headers,
},
responseType: 'stream',
body: JSON.stringify(req),
signal,
});
return (async function* (): AsyncGenerator<T> {
const rl = readline.createInterface({
input: res.data as PassThrough,
crlfDelay: Infinity, // Recognizes '\r\n' and '\n' as line breaks
});
let bufferedLines: string[] = [];
for await (const line of rl) {
// blank lines are used to separate JSON objects in the stream
if (line === '') {
if (bufferedLines.length === 0) {
continue; // no data to yield
}
yield JSON.parse(bufferedLines.join('\n')) as T;
bufferedLines = []; // Reset the buffer after yielding
} else if (line.startsWith('data: ')) {
bufferedLines.push(line.slice(6).trim());
} else {
throw new Error(`Unexpected line format in response: ${line}`);
}
}
})();
}
}
|
