google-cloud-storage

Google Cloud Platform Storage Client library.

• About Cloud Storage
• JSON API Documentation

Installation

[dependencies]
google-cloud-storage = <version>
google-cloud-default = { version = <version>, features = ["storage"] }

Quickstart

Authentication

There are two ways to create a client that is authenticated against the google cloud.

The crate google-cloud-default provides two methods that help to implement those.

Automatically

The function with_auth() will try and read the credentials from a file specified in the environment variable GOOGLE_APPLICATION_CREDENTIALS, GOOGLE_APPLICATION_CREDENTIALS_JSON or from a metadata server.

This is also described in google-cloud-auth

use google_cloud_storage::client::{ClientConfig, Client};
use google_cloud_default::WithAuthExt;

async fn run() {
    let config = ClientConfig::default().with_auth().await.unwrap();
    let client = Client::new(config);
}

Manually

When you can't use the gcloud authentication but you have a different way to get your credentials (e.g a different environment variable) you can parse your own version of the 'credentials-file' and use it like that:

use google_cloud_auth::credentials::CredentialsFile;
use google_cloud_storage::client::{ClientConfig, Client};
use google_cloud_default::WithAuthExt;

async fn run(cred: CredentialsFile) {
    let config = ClientConfig::default().with_credentials(cred).await.unwrap();
    let client = Client::new(config);
}

Usage

use google_cloud_storage::client::Client;
use google_cloud_storage::client::ClientConfig;
use google_cloud_storage::sign::SignedURLOptions;
use google_cloud_storage::sign::SignBy;
use google_cloud_storage::sign::SignedURLMethod;
use google_cloud_storage::http::Error;
use google_cloud_storage::http::objects::download::Range;
use google_cloud_storage::http::objects::get::GetObjectRequest;
use google_cloud_storage::http::objects::upload::{Media, UploadObjectRequest, UploadType};
use tokio::task::JoinHandle;
use std::fs::File;
use std::io::BufReader;
use std::io::Read;

async fn run(config: ClientConfig) -> Result<(), Error> {

    // Create client.
    let mut client = Client::new(config);

    // Upload the file
    let upload_type = UploadType::Simple(Media::new("file.png"));
    let uploaded = client.upload_object(&UploadObjectRequest {
        bucket: "bucket".to_string(),
        ..Default::default()
    }, "hello world".as_bytes(), &upload_type).await;

    // Download the file
    let data = client.download_object(&GetObjectRequest {
        bucket: "bucket".to_string(),
        object: "file.png".to_string(),
        ..Default::default()
   }, &Range::default()).await;

    // Create signed url with the default key and google-access-id of the client
    let url_for_download = client.signed_url("bucket", "foo.txt", None, None, SignedURLOptions::default());
    let url_for_upload = client.signed_url("bucket", "foo.txt", None, None, SignedURLOptions {
        method: SignedURLMethod::PUT,
        ..Default::default()
    });

    Ok(())
}