This is a work-in-progress QUIC implementation for Go. This is based on libquic library, which is in turn based on original QUIC implementation on Chromium.
QUIC is an experimental protocol aimed at reducing web latency over that of TCP. On the surface, QUIC is very similar to TCP+TLS+SPDY implemented on UDP. Because TCP is implement in operating system kernels, and middlebox firmware, making significant changes to TCP is next to impossible. However, since QUIC is built on top of UDP, it suffers from no such limitations.
Key features of QUIC over existing TCP+TLS+SPDY include
- Dramatically reduced connection establishment time
- Improved congestion control
- Multiplexing without head of line blocking
- Forward error correction
- Connection migration
This library is highly experimental. Although libquic sources are from
Chromium (which are tested), the Go bindings are still highly pre-alpha state.
Known issues:
- No support for read streaming. All request must fit in memory.
- Secure QUIC not fully tested. May not support ECDSA certificates.
Things to do:
- Read streaming support
A very primitive benchmark testing have been done. Testing environments below:
| Items | Description |
|---|---|
| Optimization | libquic built with -O3 parameters |
| CPU | Intel(R) Core(TM) i7-4930K CPU @ 3.40GHz |
| Server Code | https://github.com/devsisters/gospdyquic/blob/master/example/server.go |
| Server Parms | GOMAXPROCS=12 ./server -port 9090 -n 12 |
| Client Code | https://github.com/devsisters/quicbench/blob/master/quicbench.go |
| Client Parms | ./quicbench -u="https://example.com:9090/" -c 200 -r 1000 |
The server code is modified to create 30B, 1kB, 5kB, 10kB HTTP body payload. Concurrency is 200 and each thread requests 1,000 requests. It is designed to measure ideal throughput of the server. Naturally the throughput goes down when concurrency increases.
Benchmark results:
| Payload Size | Requests per Second |
|---|---|
| 30B Payload | 23832.18 RPS |
| 1kB Payload | 21704.84 RPS |
| 5kB Payload | 9343.58 RPS |
| 10kB Payload | 5312.75 RPS |
On 10kB case, calculating the total network throughput is 435Mbps.
How many connections per second can this server process?
./gobench -u="https://example.com:9090/" -c 200 -r 100 -qk=false
Turning off keepalive using qk option results in a pure new QUIC connection
per request. The benchmark results are 2905.58 CPS.
Although prebuilt static library files already exists in the repository for convenience, it is always good practice to build library files from source. You should not trust any unverifiable third-party binaries.
To build the library files for your architecture and OS:
./build_libs.shThis will fetch libquic master and build all the binaries from source. The
C/C++ files for Go bindings will be all built too.
Currently Linux and Mac OS X is supprted.
Due to Go 1.4's cgo restrictions, use an environment variable like below to build your projects. This restriction will be removed from Go 1.5.
CGO_CFLAGS="-I$GOPATH/src/github.com/devsisters/goquic/libquic/boringssl/include" CGO_LDFLAGS="-L$GOPATH/src/github.com/devsisters/goquic/lib/$GOOS_$GOARCH"
For example, building gospdyquic example server in Mac:
CGO_CFLAGS="-I$GOPATH/src/github.com/devsisters/goquic/libquic/boringssl/include" CGO_LDFLAGS="-L$GOPATH/src/github.com/devsisters/goquic/lib/darwin_amd64" go build $GOPATH/github.com/devsisters/gospdyquic/example/server.go
This is a very low-level QUIC library intended for socket-like use. To use QUIC as a SPDY transport layer, see gospdyquic for more details.