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247 lines
9 KiB
Markdown
247 lines
9 KiB
Markdown
# aquatic
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[](https://github.com/greatest-ape/aquatic/actions/workflows/cargo-build-and-test.yml) [](https://github.com/greatest-ape/aquatic/actions/workflows/test-transfer.yml)
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Blazingly fast, multi-threaded BitTorrent tracker written in Rust, consisting
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of sub-implementations for different protocols:
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[BitTorrent over UDP]: https://libtorrent.org/udp_tracker_protocol.html
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[BitTorrent over HTTP]: https://wiki.theory.org/index.php/BitTorrentSpecification#Tracker_HTTP.2FHTTPS_Protocol
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[WebTorrent]: https://github.com/webtorrent
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[rustls]: https://github.com/rustls/rustls
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[native-tls]: https://github.com/sfackler/rust-native-tls
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[mio]: https://github.com/tokio-rs/mio
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[glommio]: https://github.com/DataDog/glommio
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| Name | Protocol | OS requirements |
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|--------------|--------------------------------------------|------------------------------------------------------------|
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| aquatic_udp | [BitTorrent over UDP] | Unix-like |
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| aquatic_http | [BitTorrent over HTTP] with TLS ([rustls]) | Linux 5.8+ |
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| aquatic_ws | [WebTorrent] | Unix-like with [mio] (default) / Linux 5.8+ with [glommio] |
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## Usage
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### Prerequisites
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- Install Rust with [rustup](https://rustup.rs/) (stable is recommended)
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- Install cmake with your package manager (e.g., `apt-get install cmake`)
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- Unless you're planning to only run the cross-platform mio based
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implementations, make sure locked memory limits are sufficient.
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You can do this by adding the following lines to `/etc/security/limits.conf`,
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and then logging out and back in:
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```
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* hard memlock 512
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* soft memlock 512
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```
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- Clone this git repository and enter it
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### Compiling
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Compile the implementations that you are interested in:
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```sh
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# Tell Rust to enable support for all CPU extensions present on current CPU
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# except for those relating to AVX-512. This is necessary for aquatic_ws and
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# recommended for the other implementations.
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. ./scripts/env-native-cpu-without-avx-512
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cargo build --release -p aquatic_udp
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cargo build --release -p aquatic_http
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cargo build --release -p aquatic_ws
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cargo build --release -p aquatic_ws --features "with-glommio" --no-default-features
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```
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### Running
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Begin by generating configuration files. They differ between protocols.
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```sh
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./target/release/aquatic_udp -p > "aquatic-udp-config.toml"
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./target/release/aquatic_http -p > "aquatic-http-config.toml"
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./target/release/aquatic_ws -p > "aquatic-ws-config.toml"
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```
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Make adjustments to the files. You will likely want to adjust `address`
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(listening address) under the `network` section.
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`aquatic_http` requires configuring a TLS certificate file as well as a
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private key file to run. More information is available in the
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corresponding subsection of this document.
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Once done, run the tracker:
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```sh
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./target/release/aquatic_udp -c "aquatic-udp-config.toml"
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./target/release/aquatic_http -c "aquatic-http-config.toml"
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./target/release/aquatic_ws -c "aquatic-ws-config.toml"
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```
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### Configuration values
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Starting a lot more socket workers than request workers is recommended. All
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implementations are heavily IO-bound and spend most of their time reading from
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and writing to sockets. This part is handled by the `socket_workers`, which
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also do parsing, serialisation and access control. They pass announce and
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scrape requests to the `request_workers`, which update internal tracker state
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and pass back responses.
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#### Access control
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Access control by info hash is supported for all protocols. The relevant part
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of configuration is:
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```toml
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[access_list]
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mode = 'off' # Change to 'black' (blacklist) or 'white' (whitelist)
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path = '' # Path to text file with newline-delimited hex-encoded info hashes
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```
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The file is read on start and when the program receives `SIGUSR1`. If initial
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parsing fails, the program exits. Later failures result in in emitting of
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an error-level log message, while successful updates of the access list result
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in emitting of an info-level log message.
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#### More information
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More documentation of the various configuration options might be available
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under `src/lib/config.rs` in directories `aquatic_udp`, `aquatic_http` and
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`aquatic_ws`.
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## Details on implementations
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### aquatic_udp: UDP BitTorrent tracker
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Aims to implements the
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[UDP BitTorrent protocol](https://libtorrent.org/udp_tracker_protocol.html),
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except that it:
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* Doesn't care about IP addresses sent in announce requests. The packet
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source IP is always used.
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* Doesn't track of the number of torrent downloads (0 is always sent).
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Supports IPv4 and IPv6.
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#### Performance
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More details are available [here](./documents/aquatic-udp-load-test-2021-11-28.pdf).
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#### Optimisation attempts that didn't work out
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* Using glommio
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* Using io-uring
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* Using zerocopy + vectored sends for responses
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### aquatic_http: HTTP BitTorrent tracker
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[HTTP BitTorrent protocol]: https://wiki.theory.org/index.php/BitTorrentSpecification#Tracker_HTTP.2FHTTPS_Protocol
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Aims for compatibility with the [HTTP BitTorrent protocol], with some exceptions:
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* Only runs over TLS
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* Doesn't track of the number of torrent downloads (0 is always sent)
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* Doesn't allow full scrapes, i.e. of all registered info hashes
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`aquatic_http` has not been tested as much as `aquatic_udp` but likely works
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fine.
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#### TLS
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A TLS certificate file (DER-encoded X.509) and a corresponding private key file
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(DER-encoded ASN.1 in either PKCS#8 or PKCS#1 format) are required. Set their
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paths in the configuration file, e.g.:
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```toml
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[network]
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address = '0.0.0.0:3000'
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tls_certificate_path = './cert.pem'
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tls_private_key_path = './key.pem'
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```
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### aquatic_ws: WebTorrent tracker
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Aims for compatibility with [WebTorrent](https://github.com/webtorrent)
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clients, with some exceptions:
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* Doesn't track of the number of torrent downloads (0 is always sent).
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* Doesn't allow full scrapes, i.e. of all registered info hashes
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#### TLS: mio version
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To run over TLS, a pkcs12 file (`.pkx`) is needed. It can be generated from
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Let's Encrypt certificates as follows, assuming you are in the directory where
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they are stored:
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```sh
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openssl pkcs12 -export -out identity.pfx -inkey privkey.pem -in cert.pem -certfile fullchain.pem
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```
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Enter a password when prompted. Then move `identity.pfx` somewhere suitable,
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and enter the path into the tracker configuration field `tls_pkcs12_path`. Set
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the password in the field `tls_pkcs12_password` and set `use_tls` to true.
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#### TLS: glommio version
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The glommio version only runs over TLS. For setup instructions, please see
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`aquatic_http` TLS section above.
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#### Benchmarks
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[wt-tracker]: https://github.com/Novage/wt-tracker
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[bittorrent-tracker]: https://github.com/webtorrent/bittorrent-tracker
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The following benchmark is not very realistic, as it simulates a small number
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of clients, each sending a large number of requests. Nonetheless, I think that
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it gives a useful indication of relative performance.
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Server responses per second, best result in bold:
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| workers | aquatic | [wt-tracker] | [bittorrent-tracker] |
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|---------|------------|--------------|----------------------|
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| 1 | n/a | __117k__ | 45k |
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| 2 | __225k__ | n/a | n/a |
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| 4 | __627k__ | n/a | n/a |
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| 6 | __831k__* | n/a | n/a |
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| 8 | __1209k__* | n/a | n/a |
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| 10 | __1455k__* | n/a | n/a |
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| 12 | __1650k__* | n/a | n/a |
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| 14 | __1804k__* | n/a | n/a |
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| 16 | __1789k__* | n/a | n/a |
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\* Using a VPS with 32 vCPUs. The other measurements were made using a 16 vCPU VPS.
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Please refer to `documents/aquatic-ws-load-test-2021-08-18.pdf` for more details.
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__Note__: these benchmarks were made with the mio-based implementation.
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## Load testing
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There are load test binaries for all protocols. They use a CLI structure
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similar to the trackers and support generation and loading of configuration
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files.
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To run, first start the tracker that you want to test. Then run the
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corresponding load test binary:
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```sh
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./scripts/run-load-test-udp.sh
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./scripts/run-load-test-http.sh
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./scripts/run-load-test-ws.sh
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```
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To fairly compare HTTP performance to opentracker, set keepalive to false in
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`aquatic_http` settings.
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## Copyright and license
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Copyright (c) 2020-2021 Joakim Frostegård
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Distributed under Apache 2.0 license (details in `LICENSE` file.)
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## Trivia
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The tracker is called aquatic because it thrives under a torrent of bits ;-)
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