Question

我想上传大于150mb的文件。

在Dropbox API V2文档中，它表示您应该开始upload session。

文档说你不能发送超过150mb的数据的POST，但我不确定如何使用upload_session API实现这一点。

Answer 1

虽然任何单个请求都不应超过150 MB（通常您应该使用明显更小的块大小），但您可以使用多个请求上传大于此的文件。

下面是使用上传会话的示例。该示例使用Python SDK，但使用JavaScript SDK，但它应该作为有用的参考，因为逻辑是相同的。（它们都使用相同的底层API。）

这使用Dropbox Python SDK将file_path指定的本地文件中的文件上传到Dropbox API，并将其dest_path指定到远程路径。它还根据文件大小选择是否使用上传会话：

f = open(file_path)
file_size = os.path.getsize(file_path)

CHUNK_SIZE = 4 * 1024 * 1024

if file_size <= CHUNK_SIZE:

    print dbx.files_upload(f.read(), dest_path)

else:

    upload_session_start_result = dbx.files_upload_session_start(f.read(CHUNK_SIZE))
    cursor = dropbox.files.UploadSessionCursor(session_id=upload_session_start_result.session_id,
                                               offset=f.tell())
    commit = dropbox.files.CommitInfo(path=dest_path)

    while f.tell() < file_size:
        if ((file_size - f.tell()) <= CHUNK_SIZE):
            print dbx.files_upload_session_finish(f.read(CHUNK_SIZE),
                                            cursor,
                                            commit)
        else:
            dbx.files_upload_session_append(f.read(CHUNK_SIZE),
                                            cursor.session_id,
                                            cursor.offset)
            cursor.offset = f.tell()

f.close()

Answer 2

您可以使用files/upload_session/start，files/upload_session/append_v2和files/upload_session/finish API端点快速上传文件块。这是一个使用我的小Dropbox v2 api包装器（dropbox-v2-api）的例子：

const CHUNK_LENGTH = 100;
//create read streams, which generates set of 100 (CHUNK_LENGTH) characters of values: 1 and 2
const firstUploadChunkStream = () => utils.createMockedReadStream('1', CHUNK_LENGTH); 
const secondUploadChunkStream = () => utils.createMockedReadStream('2', CHUNK_LENGTH);

sessionStart((sessionId) => {
    sessionAppend(sessionId, () => {
        sessionFinish(sessionId);
    });
});

function sessionStart(cb) {
    dropbox({
        resource: 'files/upload_session/start',
        parameters: {
            close: false
        },
        readStream: firstUploadChunkStream()
    }, (err, response) => {
        if (err) { return console.log('sessionStart error: ', err) }
        console.log('sessionStart response:', response);
        cb(response.session_id);
    });
}


function sessionAppend(sessionId, cb) {
    dropbox({
        resource: 'files/upload_session/append_v2',
        parameters: {
            cursor: {
                session_id: sessionId,
                offset: CHUNK_LENGTH
            },
            close: false,
        },
        readStream: secondUploadChunkStream()
    }, (err, response) => {
        if(err){ return console.log('sessionAppend error: ', err) }
        console.log('sessionAppend response:', response);
        cb();
    });
}

function sessionFinish(sessionId) {
    dropbox({
        resource: 'files/upload_session/finish',
        parameters: {
            cursor: {
                session_id: sessionId,
                offset: CHUNK_LENGTH * 2
            },
            commit: {
                path: "/result.txt",
                mode: "add",
                autorename: true,
                mute: false
            }
        }
    }, (err, response) => {
        if (err) { return console.log('sessionFinish error: ', err) }
        console.log('sessionFinish response:', response);
    });
}

Answer 3

我有一个例子！

testFile1Data = "test file data 1";
dbx.filesUploadSessionStart({
  contents: testFile1Data,
  close: true,
})
.then(function (response) {
  file1Start = response;
})
.catch(function (err) {
  console.log(err);
});

testFile2Data = "test file data 2";
dbx.filesUploadSessionStart({
  contents: testFile2Data,
  close: true,
})
.then(function (response) {
  file2Start = response;
})
.catch(function (err) {
  console.log(err);
});

dbx.filesUploadSessionFinishBatch({entries: [
    {cursor: {session_id: file1Start.session_id, offset: testFile1Data.length}, commit: {path: "/testFile1.txt"}},
    {cursor: {session_id: file2Start.session_id, offset: testFile2Data.length}, commit: {path: "/testFile2.txt"}},
  ]})
.then(function (response) {
  finishBatch = response;
})
.catch(function (err) {
  console.log(err);
});

dbx.filesUploadSessionFinishBatchCheck({async_job_id: finishBatch.async_job_id})
.then(function (response) {
  finishBatch = response
})
.catch(function (err) {
  console.log(err);
});

我从github上的问题主题获得了示例 - https://github.com/dropbox/dropbox-sdk-js/issues/80#issuecomment-283189888

如何为大于150mb的文件使用Dropbox上传会话？

3 个答案: