OpenDAL  

Open Data Access Layer: Access data freely, painlessly, and efficiently

• User Guide
• API Documentation: stable | main
• Release notes

Services

• azblob: Azure Storage Blob services.
• azdfs: Azure Data Lake Storage Gen2 services. (As known as abfs)
• fs: POSIX alike file system.
• ftp: FTP and FTPS support.
• gcs: Google Cloud Storage Service.
• ghac: Github Action Cache Service.
• hdfs: Hadoop Distributed File System(HDFS).
• http: HTTP read-only services.
• ipfs: InterPlanetary File System HTTP Gateway support.
• ipmfs: InterPlanetary File System MFS API support.
• memcached: Memcached service support.
• memory: In memory backend.
• moka: moka backend support.
• obs: Huawei Cloud Object Storage Service (OBS).
• oss: Aliyun Object Storage Service (OSS).
• redis: Redis services support.
• rocksdb: RocksDB services support.
• s3: AWS S3 alike services.
• webdav: WebDAV Service Support.

Features

Access data freely

• Access different storage services in the same way
• Behavior tests for all services
• Cross language/project bindings (working on)
  • Python
  • Node.js
  • object_store

Access data painlessly

• 100% documents covered
• Powerful Layers
• Automatic retry support
• Full observability support: logging, tracing, metrics.
• Native decompress support
• Native service-side encryption support

Access data efficiently

• Zero cost: mapping to underlying API calls directly
• Best effort: auto pick the best read/seek/next implementations based on services
• Auto metadata reuse: avoid extra metadata calls

Quickstart

use anyhow::Result;
use futures::StreamExt;
use futures::TryStreamExt;
use opendal::ObjectReader;
use opendal::Object;
use opendal::ObjectMetadata;
use opendal::ObjectMode;
use opendal::Operator;
use opendal::services;

#[tokio::main]
async fn main() -> Result<()> {
    // Init Operator
    let op = Operator::create(services::Fs::default())?.finish();

    // Create object handler.
    let o = op.object("/tmp/test_file");

    // Write data info object;
    o.write("Hello, World!").await?;

    // Read data from object;
    let bs = o.read().await?;

    // Read range from object;
    let bs = o.range_read(1..=11).await?;

    // Get object's path
    let name = o.name();
    let path = o.path();

    // Fetch more meta about object.
    let meta = o.metadata().await?;
    let mode = meta.mode();
    let length = meta.content_length();
    let content_md5 = meta.content_md5();
    let etag = meta.etag();

    // Delete object.
    o.delete().await?;

    // List dir object.
    let o = op.object("test_dir/");
    let mut os = o.list().await?;
    while let Some(entry) = os.try_next().await? {
        let path = entry.path();
        let mode = entry.mode().await?;
    }

    Ok(())
}

More examples could be found at Documentation.

Projects

• Databend: A modern Elasticity and Performance cloud data warehouse.
• GreptimeDB: An open-source, cloud-native, distributed time-series database.
• deepeth/mars: The powerful analysis platform to explore and visualize data from blockchain.
• mozilla/sccache: sccache is ccache with cloud storage

Contributing

Check out the CONTRIBUTING.md guide for more details on getting started with contributing to this project.

Getting help

Submit issues for bug report or asking questions in discussion.

License