azure-storage-blob-rust – Coding skill for AI agents

Azure Blob Storage SDK for Rust

Client library for Azure Blob Storage — Microsoft's object storage solution for the cloud.

The examples below require a reviewed compatible crate set and replacement of every resource placeholder. Do not use production data for demonstration writes.

Installation

cargo add azure_storage_blob@=1.1.0 azure_identity@=1.0.0 azure_core@=1.1.0

Environment Variables

export AZURE_STORAGE_ACCOUNT_NAME="<storage-account-name>"
# Endpoint: https://<account>.blob.core.windows.net/

Authentication

use azure_identity::DeveloperToolsCredential;
use azure_core::http::Url;
use azure_storage_blob::clients::{BlobClient, BlobClientOptions};

let credential = DeveloperToolsCredential::new(None)?;
let blob_client = BlobClient::new(
    Url::parse("https://<account>.blob.core.windows.net/container-name/blob-name")?,
    Some(credential.clone()),
    Some(BlobClientOptions::default()),
)?;

Client Types

| Client | Purpose |

|--------|---------|

| BlobServiceClient | Account-level operations, list containers |

| BlobContainerClient | Container operations, list blobs |

| BlobClient | Individual blob operations |

Core Operations

Upload Blob

use azure_core::http::RequestContent;
use azure_storage_blob::models::BlobClientUploadOptions;

let data = b"hello world";
blob_client
    .upload(
        RequestContent::from(data.to_vec()),
        Some(BlobClientUploadOptions::if_not_exists()), // fail rather than overwrite an existing blob
    )
    .await?;

Download Blob

let response = blob_client.download(None).await?;
// Check the approved size before fetching; use download_into with a bounded buffer for large data.
let content = response.body.collect().await?;
// Process authorized bytes; do not log the payload.

Get Blob Properties

let properties = blob_client.get_properties(None).await?;
// Read the version-specific response header trait; properties is a response, not a content_length field.
// Do not infer a body/size limit from successful metadata access alone.

Delete Blob

blob_client.delete(None).await?;

Container Operations

use azure_storage_blob::clients::BlobContainerClient;
use futures::TryStreamExt;

let container_client = BlobContainerClient::new(
    Url::parse("https://<account>.blob.core.windows.net/container-name")?,
    Some(credential),
    None,
)?;

// Create container
container_client.create(None).await?;

// List blobs
let mut pager = container_client.list_blobs(None)?;
while let Some(page) = pager.try_next().await? {
    let listing = page.into_model()?;
    // Process this listing page; apply an explicit maximum-page budget.
}

Best Practices

1. Use Entra ID auth — DeveloperToolsCredential for dev, ManagedIdentityCredential for production

2. Review overwrite behavior — the reviewed upload API uses options; if_not_exists prevents unintended replacement

3. Use RequestContent::from() — to wrap upload data

4. Handle async operations — use tokio runtime

5. Check RBAC permissions — ensure "Storage Blob Data Contributor" role

RBAC Permissions

For Entra ID auth, assign one of these roles:

• Storage Blob Data Reader — read-only
• Storage Blob Data Contributor — read/write
• Storage Blob Data Owner — blob-data access and supported ownership/ACL management; it does not grant general Azure RBAC role-assignment authority

The example API follows [BlobClient 1.1.0](https://docs.rs/azure_storage_blob/1.1.0/azure_storage_blob/clients/struct.BlobClient.html); earlier releases used different constructor/upload signatures. Use the project’s compatible Azure crate versions rather than mixing them.

The reviewed example set uses azure_storage_blob 1.1.0 and compatible Azure core/credential crates. Record and commit Cargo.lock; source/API review is not a compiler or live-service test.

Reference Links

| Resource | Link |

|----------|------|

| API Reference | https://docs.rs/azure_storage_blob |

| Source Code | https://github.com/Azure/azure-sdk-for-rust/tree/main/sdk/storage/azure_storage_blob |

| crates.io | https://crates.io/crates/azure_storage_blob |

When to Use

Use when a Rust application uploads/downloads a specified Azure blob, reads its properties or manages an authorized container.

Limitations

• Examples are fragments inside async application code, with compatible pinned Azure crates and the required Tokio/Serde/Futures dependencies; verify the selected version’s API before use. They were reviewed against official source/reference, not compiled or run against a cloud account here.
• Use an authorized tenant, resource and identity with least privilege. Writes, overwrites, deletes, backup retrieval and account changes require the corresponding scope; cleanup may remove only explicitly identified disposable resources. Bound requests, retries and downloaded bytes, and do not log payloads, credentials or secret values.
• Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
• Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.