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https://github.com/sethvargo/go-limiter
A supersonic rate limiting package for Go with HTTP middleware.
https://github.com/sethvargo/go-limiter
Last synced: 14 days ago
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A supersonic rate limiting package for Go with HTTP middleware.
- Host: GitHub
- URL: https://github.com/sethvargo/go-limiter
- Owner: sethvargo
- License: apache-2.0
- Created: 2020-07-10T01:52:04.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2024-08-15T01:43:45.000Z (3 months ago)
- Last Synced: 2024-10-04T10:09:55.080Z (about 1 month ago)
- Language: Go
- Size: 85 KB
- Stars: 532
- Watchers: 4
- Forks: 39
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Contributing: .github/CONTRIBUTING.md
- License: LICENSE
Awesome Lists containing this project
- awesome - sethvargo/go-limiter - A supersonic rate limiting package for Go with HTTP middleware. (Go)
- awesome-repositories - sethvargo/go-limiter - A supersonic rate limiting package for Go with HTTP middleware. (Go)
README
# Go Rate Limiter
[](https://pkg.go.dev/github.com/sethvargo/go-limiter)
[](https://github.com/sethvargo/go-limiter/actions/workflows/test.yml)
This package provides a rate limiter in Go (Golang), suitable for use in HTTP
servers and distributed workloads. It's specifically designed for
configurability and flexibility without compromising throughput.
## Usage
1. Create a store. This example uses an in-memory store:
```golang
store, err := memorystore.New(&memorystore.Config{
// Number of tokens allowed per interval.
Tokens: 15,
// Interval until tokens reset.
Interval: time.Minute,
})
if err != nil {
log.Fatal(err)
}
```
1. Determine the limit by calling `Take()` on the store:
```golang
ctx := context.Background()
// key is the unique value upon which you want to rate limit, like an IP or
// MAC address.
key := "127.0.0.1"
tokens, remaining, reset, ok, err := store.Take(ctx, key)
// tokens is the configured tokens (15 in this example).
_ = tokens
// remaining is the number of tokens remaining (14 now).
_ = remaining
// reset is the unix nanoseconds at which the tokens will replenish.
_ = reset
// ok indicates whether the take was successful. If the key is over the
// configured limit, ok will be false.
_ = ok
// Here's a more realistic example:
if !ok {
return fmt.Errorf("rate limited: retry at %v", reset)
}
```
There's also HTTP middleware via the `httplimit` package. After creating a
store, wrap Go's standard HTTP handler:
```golang
middleware, err := httplimit.NewMiddleware(store, httplimit.IPKeyFunc())
if err != nil {
log.Fatal(err)
}
mux1 := http.NewServeMux()
mux1.Handle("/", middleware.Handle(doWork)) // doWork is your original handler
```
The middleware automatically set the following headers, conforming to the latest
RFCs:
- `X-RateLimit-Limit` - configured rate limit (constant).
- `X-RateLimit-Remaining` - number of remaining tokens in current interval.
- `X-RateLimit-Reset` - UTC time when the limit resets.
- `Retry-After` - Time at which to retry
## Why _another_ Go rate limiter?
I really wanted to learn more about the topic and possibly implementations. The
existing packages in the Go ecosystem either lacked flexibility or traded
flexibility for performance. I wanted to write a package that was highly
extensible while still offering the highest levels of performance.
### Speed and performance
How fast is it? You can run the benchmarks yourself, but here's a few sample
benchmarks with 100,000 unique keys. I added commas to the output for clarity,
but you can run the benchmarks via `make benchmarks`:
```text
$ make benchmarks
BenchmarkSethVargoMemory/memory/serial-7 13,706,899 81.7 ns/op 16 B/op 1 allocs/op
BenchmarkSethVargoMemory/memory/parallel-7 7,900,639 151 ns/op 61 B/op 3 allocs/op
BenchmarkSethVargoMemory/sweep/serial-7 19,601,592 58.3 ns/op 0 B/op 0 allocs/op
BenchmarkSethVargoMemory/sweep/parallel-7 21,042,513 55.2 ns/op 0 B/op 0 allocs/op
BenchmarkThrottled/memory/serial-7 6,503,260 176 ns/op 0 B/op 0 allocs/op
BenchmarkThrottled/memory/parallel-7 3,936,655 297 ns/op 0 B/op 0 allocs/op
BenchmarkThrottled/sweep/serial-7 6,901,432 171 ns/op 0 B/op 0 allocs/op
BenchmarkThrottled/sweep/parallel-7 5,948,437 202 ns/op 0 B/op 0 allocs/op
BenchmarkTollbooth/memory/serial-7 3,064,309 368 ns/op 0 B/op 0 allocs/op
BenchmarkTollbooth/memory/parallel-7 2,658,014 448 ns/op 0 B/op 0 allocs/op
BenchmarkTollbooth/sweep/serial-7 2,769,937 430 ns/op 192 B/op 3 allocs/op
BenchmarkTollbooth/sweep/parallel-7 2,216,211 546 ns/op 192 B/op 3 allocs/op
BenchmarkUber/memory/serial-7 13,795,612 94.2 ns/op 0 B/op 0 allocs/op
BenchmarkUber/memory/parallel-7 7,503,214 159 ns/op 0 B/op 0 allocs/op
BenchmarkUlule/memory/serial-7 2,964,438 405 ns/op 24 B/op 2 allocs/op
BenchmarkUlule/memory/parallel-7 2,441,778 469 ns/op 24 B/op 2 allocs/op
```
There's likely still optimizations to be had, pull requests are welcome!
### Ecosystem
Many of the existing packages in the ecosystem take dependencies on other
packages. I'm an advocate of very thin libraries, and I don't think a rate
limiter should be pulling external packages. That's why **go-limit uses only the
Go standard library**.
### Flexible and extensible
Most of the existing rate limiting libraries make a strong assumption that rate
limiting is only for HTTP services. Baked in that assumption are more
assumptions like rate limiting by "IP address" or are limited to a resolution of
"per second". While go-limit supports rate limiting at the HTTP layer, it can
also be used to rate limit literally anything. It rate limits on a user-defined
arbitrary string key.
### Stores
#### Memory
Memory is the fastest store, but only works on a single container/virtual
machine since there's no way to share the state.
[Learn more](https://pkg.go.dev/github.com/sethvargo/go-limiter/memorystore).
#### Redis
Redis uses Redis + Lua as a shared pool, but comes at a performance cost.
[Learn more](https://pkg.go.dev/github.com/sethvargo/go-redisstore).
#### Noop
Noop does no rate limiting, but still implements the interface - useful for
testing and local development.
[Learn more](https://pkg.go.dev/github.com/sethvargo/go-limiter/noopstore).