A Rust thread-safe, shared (asynchronous) stream buffer designed to lock only on accessing and storing new data.

Streamcatcher is designed to allow seeking on otherwise one-way streams (e.g., command output) whose output needs to be accessed by many threads without constant reallocations, contention over safe read-only data, or unnecessary stalling. Only threads who read in new data ever need to lock the data structure, and do not prevent earlier reads from occurring.

• Lockless access to pre-read data and finished streams.
• Transparent caching of newly read data.
• Allows seeking on read-only bytestreams.
• Piecewise allocation to reduce copying and support unknown input lengths.
• Optional acceleration of reads on stream completion by copying to a single backing store.
• (Stateful) bytestream transformations.
• Async support with the "async" feature, and runtimes via ["async-std-compat", "smol-compat", "tokio-compat"].

The main algorithm is outlined in this blog post, with rope reference tracking moved to occur only in the core.

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

Detailed guidelines are given in the CONTRIBUTING file.