在由 Storage 触发的 Google Cloud 函数中提供上下文

Question

我正在 Google Cloud Function 中尝试此代码，由节点 10 的 Cloud Storage 触发。

我不确定如何使上下文可用。 Event: ${context.eventId}

我试过了：module.exports.getDevices(context) = getDevices;

我试过了：module.exports.getDevices = getDevices(context);

async function getDevices() {
    console.log(`  Event: ${context.eventId}`);
    const cloudRegion = '....';
    const projectId = '.....';
    const registryId = '.....';
    const iot = require('@google-cloud/iot');
    const iotClient = new iot.v1.DeviceManagerClient({});

    const parentName = iotClient.registryPath(projectId, cloudRegion, registryId);

    try {
      const responses = await iotClient.listDevices({parent: parentName});
  
      const devices = responses[0];     

      if (devices.length > 0) {
    console.log('Current devices in registry:');
      } else {
        console.log('No devices in registry.');
      }

      for (let i = 0; i < devices.length; i++) {
        const device = devices[i];
        console.log(`Device ${i}: `, device);
    }
        } catch (err) {
          console.error('Could not list devices', err);
        }

}

module.exports.getDevices = getDevices;

另外，这可行，但我想要和前一个一样的异步功能：

exports.helloGCS = (file, context) => {
  console.log(`  Event: ${context.eventId}`);
};

Answer 1

如果你想要一个异步函数，只需声明它：

exports.helloGCS = async (file, context) => {
  console.log(`  Event: ${context.eventId}`);
};

如果你想让它调用一个命名函数：

async function getDevices(file, context) {
  console.log(`  Event: ${context.eventId}`);
}

exports.helloGCS = getDevices;