OpenDAL   Build Status Latest Version Crate Downloads

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

You may be looking for:



Access data freely

  • Access different storage services in the same way
  • Behavior tests for all services

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
  • Auto metadata reuse: avoid extra metadata calls


use anyhow::Result;
use futures::StreamExt;
use futures::TryStreamExt;
use opendal::ObjectStreamer;
use opendal::Object;
use opendal::ObjectMetadata;
use opendal::ObjectMode;
use opendal::Operator;
use opendal::Scheme;

async fn main() -> Result<()> {
    // Init Operator
    let op = Operator::from_env(Scheme::Fs)?;

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

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

    // Read data from object;
    let bs =;

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

    // Get object's path
    let 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.

    // 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?;


More examples could be found at Documentation.


  • 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.


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

Getting help

Submit issues for bug report or asking questions in discussion.


Licensed under Apache License, Version 2.0.