content-cache-update.js

// Copyright 2025 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

'use strict';

// [START googlegenaisdk_contentcache_update]
const {GoogleGenAI} = require('@google/genai');
const {DateTime} = require('luxon');

const GOOGLE_CLOUD_PROJECT = process.env.GOOGLE_CLOUD_PROJECT;
const GOOGLE_CLOUD_LOCATION = process.env.GOOGLE_CLOUD_LOCATION || 'global';


async function generateContent(
  projectId = GOOGLE_CLOUD_PROJECT,
  location = GOOGLE_CLOUD_LOCATION,
  cacheName
) {
  const ai = new GoogleGenAI({
    vertexai: true,
    project: projectId,
    location: location,
    httpOptions: {
      apiVersion: 'v1',
    },
  });

  let contentCache = await ai.caches.get({
    name: cacheName,
  });

  console.log('Expire time', contentCache.expireTime);

  contentCache = await ai.caches.update({
    name: cacheName,
    config: {
      ttl: '36000s',
    },
  });

  const expireTime = DateTime.fromISO(contentCache.expireTime, {zone: 'utc'});
  const now = DateTime.utc();
  const timeDiff = expireTime.diff(now, ['seconds']);

  console.log('Expire time (after update):', expireTime.toISO());
  console.log('Expire time (in seconds):', Math.floor(timeDiff.seconds));

  const nextWeekUtc = DateTime.utc().plus({days: 7});
  console.log('Next week (UTC):', nextWeekUtc.toISO());

  contentCache = await ai.caches.update({
    name: cacheName,
    config: {
      expireTime: nextWeekUtc,
    },
  });

  console.log('Expire time (after update):', contentCache.expireTime);
  return contentCache;
}
// [END googlegenaisdk_contentcache_update]

module.exports = {
  generateContent,
};