如何使用 firebase 函数返回保存在 firebase 存储中的文件的 json 内容

Question

I want to frequently update client side indexeddb data store from the cloud. So what I am thinking is to call the firebase function and have the function fetch an update json file in firebase storage and then return the content of that json file to client side which will update the indexeddb afterwards.

I tried to return this json file with this code

exports.updateProductCatalogue = functions.https.onCall(async (data, context) => {
    const filepath = data.filepath
    const bucketname = data.bucket

     
    const bucket = storage.bucket();
    const remoteFile = bucket.file("storeid.json");

    let buffer = '';
    remoteFile.createReadStream()
    .on('error', function(err) {console.log(err)})
    .on('data', function(response) {
        buffer += response
    })
    .on('end', function() {
        //console.log(buffer);
        return buffer
     
    })
  })

when ever I try to deploy the code to the cloud it throws this error

firebase-functions/functions/node_modules/@google-cloud/storage/node_modules/p-limit/index.js:30
    } catch {}
            ^

SyntaxError: Unexpected token {
at createScript (vm.js:80:10)
at Object.runInThisContext (vm.js:139:10)
at Module._compile (module.js:617:28)
at Object.Module._extensions..js (module.js:664:10)
at Module.load (module.js:566:32)
at tryModuleLoad (module.js:506:12)
at Function.Module._load (module.js:498:3)
at Module.require (module.js:597:17)
at require (internal/module.js:11:18)

I was able to narrow the source of the error to this code

 const bucket = storage.bucket();

How can I return the json content on the file via firebase functions?

Answer 1

This is not an issue with your code (phew!) but a configuration of your project. Try using node 10+ to address the exception syntax error . After you update node+npm, don't forget to update you package.json :

{
"...": "...",
  "engines": {
    "node": "10",
    "npm": "6"
  }
}