I am using google storage api for saving a file in gcp bucket in a async function. I want to wait till I get a error or success in callback, only then I want to proceed with other lines of code but I am getting LastMessage before success or error.
https://googleapis.dev/nodejs/storage/latest/File.html#save
await file.save(jsonData.trim(), {resumable : false}, function(error) {
if (error) {
console.log('error');
} else {
console.log('success');
}
})
console.log( "LastMessage: Error or Success is received, only then log this message")
Your .save() is not returning promise. Rather is giving a callback.
You can create a traditional promise method to get what you want to achieve.
Here's the code snippet for that -
const saveFile = (jsonData) => {
return new Promise((resolve, reject) => {
file.save(jsonData.trim(), { resumable: false }, function (error) {
if (error) {
console.log('error');
reject()
} else {
console.log('sucess');
resolve()
}
})
})
}
await saveFile()
console.log("LastMessage: Error or Success is received, only then log this message")
There is an example in the document
https://googleapis.dev/nodejs/storage/latest/File.html#save-examples
const {Storage} = require('@google-cloud/storage');
const storage = new Storage();
const myBucket = storage.bucket('my-bucket');
const file = myBucket.file('my-file');
const contents = 'This is the contents of the file.';
file.save(contents, function(err) {
if (!err) {
// File written successfully.
}
});
//-
// If the callback is omitted, we'll return a Promise.
//-
file.save(contents).then(function() {});
You don't need to use await, for your example you can try this:
file.save(jsonData.trim(), {resumable : false})
.then(() => nextFunc())
.catch(() => nextFunc())
function nextFunc() {
console.log( "LastMessage: Error or Success is received, only then log this message")
}