如何使用/循环来上传多个文件到谷歌云端硬盘API(的forEach)
我使用谷歌云端硬盘API来上传多个文件。我面临着耗尽RAM的问题,同时上载倍数的文件。我尝试使用的forEach(for循环)为我的代码,以避免同时上传多个文件,但它不工作,我所期望的方式。它总是通过列表文件的整个循环并上传同一时间。
我尝试使用异步/ AWAIT语法来阻止循环,但它没有工作,我所期望的方式。这里是我的代码:
const fs = require("fs");
const readline = require("readline");
const { google } = require("googleapis");
let files = ["file1.mp4", "file2.mp4"];
const SCOPES = [".metadata.readonly"];
const TOKEN_PATH = "token.json";
fs.readFile("credentials.json", (err, content) => {
if (err) return console.log("Error loading client secret file:", err);
// Authorize a client with credentials, then call the Google Drive API.
authorize(JSON.parse(content), uploadFiles);
});
function authorize(credentials, callback) {
const { client_secret, client_id, redirect_uris } = credentials.installed;
const oAuth2Client = new google.auth.OAuth2(
client_id,
client_secret,
redirect_uris[0]
);
// Check if we have previously stored a token.
fs.readFile(TOKEN_PATH, (err, token) => {
if (err) return getAccessToken(oAuth2Client, callback);
oAuth2Client.setCredentials(JSON.parse(token));
callback(oAuth2Client);
});
}
function getAccessToken(oAuth2Client, callback) {
const authUrl = oAuth2Client.generateAuthUrl({
access_type: "offline",
scope: SCOPES
});
console.log("Authorize this app by visiting this url:", authUrl);
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question("Enter the code from that page here: ", code => {
rl.close();
oAuth2Client.getToken(code, (err, token) => {
if (err) return console.error("Error retrieving access token", err);
oAuth2Client.setCredentials(token);
// Store the token to disk for later program executions
fs.writeFile(TOKEN_PATH, JSON.stringify(token), err => {
if (err) console.error(err);
console.log("Token stored to", TOKEN_PATH);
});
callback(oAuth2Client);
});
});
}
async function uploadFiles(auth) {
for (file of files) {
var fileMetadata = {
name: file
};
var media = {
body: fs.createReadStream("test/" + file)
};
google.drive({ version: "v3", auth });
const result = await drive.files.create(
{
resource: fileMetadata,
media: media,
fields: "id"
},
function(err, fileid) {
if (err) {
// Handle error
console.error(err);
} else {
console.log("File Id: ", fileid.data.id);
console.log("Uploaded..:" + file);
}
}
);
console.log("Uploading file..:" + file);
}
}
回答如下:
我尝试使用的forEach(for循环)为我的代码,以避免同时上传多个文件
你不能,这个过程是完全异步的。您传递一个回调作为参数传递给函数drive.files.create
。
顺便说一句,如果你想使用async/await
,你应该换你的函数成promisified之一。
function myCreateFunc (fileInfos) {
return new Promise((resolve, reject) => {
google.drive.create(filesInfos, function callback(err, fileId) {
if(err)
reject(err)
resolve(fileId)
})
});
}
如何使用/循环来上传多个文件到谷歌云端硬盘API(的forEach)
我使用谷歌云端硬盘API来上传多个文件。我面临着耗尽RAM的问题,同时上载倍数的文件。我尝试使用的forEach(for循环)为我的代码,以避免同时上传多个文件,但它不工作,我所期望的方式。它总是通过列表文件的整个循环并上传同一时间。
我尝试使用异步/ AWAIT语法来阻止循环,但它没有工作,我所期望的方式。这里是我的代码:
const fs = require("fs");
const readline = require("readline");
const { google } = require("googleapis");
let files = ["file1.mp4", "file2.mp4"];
const SCOPES = [".metadata.readonly"];
const TOKEN_PATH = "token.json";
fs.readFile("credentials.json", (err, content) => {
if (err) return console.log("Error loading client secret file:", err);
// Authorize a client with credentials, then call the Google Drive API.
authorize(JSON.parse(content), uploadFiles);
});
function authorize(credentials, callback) {
const { client_secret, client_id, redirect_uris } = credentials.installed;
const oAuth2Client = new google.auth.OAuth2(
client_id,
client_secret,
redirect_uris[0]
);
// Check if we have previously stored a token.
fs.readFile(TOKEN_PATH, (err, token) => {
if (err) return getAccessToken(oAuth2Client, callback);
oAuth2Client.setCredentials(JSON.parse(token));
callback(oAuth2Client);
});
}
function getAccessToken(oAuth2Client, callback) {
const authUrl = oAuth2Client.generateAuthUrl({
access_type: "offline",
scope: SCOPES
});
console.log("Authorize this app by visiting this url:", authUrl);
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question("Enter the code from that page here: ", code => {
rl.close();
oAuth2Client.getToken(code, (err, token) => {
if (err) return console.error("Error retrieving access token", err);
oAuth2Client.setCredentials(token);
// Store the token to disk for later program executions
fs.writeFile(TOKEN_PATH, JSON.stringify(token), err => {
if (err) console.error(err);
console.log("Token stored to", TOKEN_PATH);
});
callback(oAuth2Client);
});
});
}
async function uploadFiles(auth) {
for (file of files) {
var fileMetadata = {
name: file
};
var media = {
body: fs.createReadStream("test/" + file)
};
google.drive({ version: "v3", auth });
const result = await drive.files.create(
{
resource: fileMetadata,
media: media,
fields: "id"
},
function(err, fileid) {
if (err) {
// Handle error
console.error(err);
} else {
console.log("File Id: ", fileid.data.id);
console.log("Uploaded..:" + file);
}
}
);
console.log("Uploading file..:" + file);
}
}
回答如下:
我尝试使用的forEach(for循环)为我的代码,以避免同时上传多个文件
你不能,这个过程是完全异步的。您传递一个回调作为参数传递给函数drive.files.create
。
顺便说一句,如果你想使用async/await
,你应该换你的函数成promisified之一。
function myCreateFunc (fileInfos) {
return new Promise((resolve, reject) => {
google.drive.create(filesInfos, function callback(err, fileId) {
if(err)
reject(err)
resolve(fileId)
})
});
}
与本文相关的文章
评论列表 (0)
- 暂无评论