first commit

.gitignore

@@ -0,0 +1 @@
+/.idea

README.md

@@ -0,0 +1,74 @@
+## echo_limiter is middleware for echo framework 
+
+echo_limiter using [redis](https://github.com/go-redis/redis) as store for rate limit with two algorithms for choosing simple, gcra [leaky bucket](https://en.wikipedia.org/wiki/Leaky_bucket)
+
+### Install
+```
+go get github.com/shareed2k/echo_limiter
+```
+### Example
+```go
+package main
+
+import (
+ "log"
+ "net/http"
+ "time"
+
+ "github.com/go-redis/redis/v7"
+ "github.com/labstack/echo/v4"
+ limiter "github.com/shareed2k/echo_limiter"
+)
+
+func main() {
+ e := echo.New()
+
+ option, err := redis.ParseURL("redis://127.0.0.1:6379/0")
+ if err != nil {
+ log.Fatal(err)
+ }
+ client := redis.NewClient(option)
+ _ = client.FlushDB().Err()
+
+ // 3 requests per 10 seconds max
+ cfg := limiter.Config{
+ Rediser: client,
+ Max: 3,
+ Burst: 3,
+ Period: 10 * time.Second,
+ Algorithm: limiter.GCRAAlgorithm,
+ }
+
+ e.Use(limiter.NewWithConfig(cfg))
+
+ e.GET("/", func(c echo.Context) error {
+ return c.String(http.StatusOK, "Hello, World!")
+ })
+ e.Logger.Fatal(e.Start(":3000"))
+}
+```
+### Test
+```curl
+curl http://localhost:3000
+...
+< HTTP/1.1 200 OK
+< Date: Fri, 03 Apr 2020 13:02:02 GMT
+< Content-Type: text/plain; charset=utf-8
+< Content-Length: 8
+< X-Ratelimit-Limit: 3
+< X-Ratelimit-Remaining: 2
+< X-Ratelimit-Reset: 1585918925
+...
+
+curl http://localhost:3000
+curl http://localhost:3000
+curl http://localhost:3000
+
+...
+< HTTP/1.1 429 Too Many Requests
+< Date: Fri, 03 Apr 2020 13:02:29 GMT
+< Content-Type: text/plain; charset=utf-8
+< Content-Length: 42
+< Retry-After: 1585918951
+...
+```

examples/main.go

@@ -0,0 +1,38 @@
+package main
+
+import (
+ "log"
+ "net/http"
+ "time"
+
+ "github.com/go-redis/redis/v7"
+ "github.com/labstack/echo/v4"
+ limiter "github.com/shareed2k/echo_limiter"
+)
+
+func main() {
+ e := echo.New()
+
+ option, err := redis.ParseURL("redis://127.0.0.1:6379/0")
+ if err != nil {
+ log.Fatal(err)
+ }
+ client := redis.NewClient(option)
+ _ = client.FlushDB().Err()
+
+ // 3 requests per 10 seconds max
+ cfg := limiter.Config{
+ Rediser: client,
+ Max: 3,
+ Burst: 3,
+ Period: 10 * time.Second,
+ Algorithm: limiter.GCRAAlgorithm,
+ }
+
+ e.Use(limiter.NewWithConfig(cfg))
+
+ e.GET("/", func(c echo.Context) error {
+ return c.String(http.StatusOK, "Hello, World!")
+ })
+ e.Logger.Fatal(e.Start(":3000"))
+}

go.mod

@@ -0,0 +1,11 @@
+module github.com/shareed2k/echo_limiter
+
+go 1.14
+
+require (
+ github.com/go-redis/redis/v7 v7.2.0
+ github.com/imdario/mergo v0.3.9
+ github.com/labstack/echo/v4 v4.1.16
+ github.com/shareed2k/go_limiter v0.0.5
+ golang.org/x/crypto v0.0.0-20200323165209-0ec3e9974c59 // indirect
+)

go.sum

@@ -0,0 +1,102 @@
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main.go

@@ -0,0 +1,143 @@
+package echo_limiter
+
+import (
+ "errors"
+ "net/http"
+ "strconv"
+ "time"
+
+ "github.com/go-redis/redis/v7"
+ "github.com/imdario/mergo"
+ "github.com/labstack/echo/v4"
+ "github.com/labstack/echo/v4/middleware"
+ "github.com/shareed2k/go_limiter"
+)
+
+const (
+ SimpleAlgorithm = "simple"
+ GCRAAlgorithm = "gcra"
+ DefaultKeyPrefix = "echo_limiter"
+ defaultMessage = "Too many requests, please try again later."
+ defaultStatusCode = http.StatusTooManyRequests
+)
+
+var (
+ DefaultConfig = Config{
+ Skipper: middleware.DefaultSkipper,
+ Max: 10,
+ Burst: 10,
+ StatusCode: defaultStatusCode,
+ Message: defaultMessage,
+ Prefix: DefaultKeyPrefix,
+ Algorithm: SimpleAlgorithm,
+ Period: time.Minute,
+ Key: func(ctx echo.Context) string {
+ return ctx.RealIP()
+ },
+ Handler: func(ctx echo.Context) error {
+ return ctx.String(defaultStatusCode, defaultMessage)
+ },
+ }
+)
+
+type (
+ Config struct {
+ Skipper middleware.Skipper
+
+ // Rediser
+ Rediser *redis.Client
+
+ // Max number of recent connections
+ // Default: 10
+ Max int
+
+ // Burst
+ Burst int
+
+ // StatusCode
+ // Default: 429 Too Many Requests
+ StatusCode int
+
+ // Message
+ // default: "Too many requests, please try again later."
+ Message string
+
+ // Algorithm
+ // Default: simple
+ Algorithm string
+
+ // Prefix
+ // Default:
+ Prefix string
+
+ // Period
+ Period time.Duration
+
+ // Key allows to use a custom handler to create custom keys
+ // Default: func(echo.Context) string {
+ // return ctx.RealIP()
+ // }
+ Key func(echo.Context) string
+
+ // Handler is called when a request hits the limit
+ // Default: func(c echo.Context) {
+ // return ctx.String(defaultStatusCode, defaultMessage)
+ // }
+ Handler func(echo.Context) error
+ }
+)
+
+func New(rediser *redis.Client) echo.MiddlewareFunc {
+ config := DefaultConfig
+ config.Rediser = rediser
+ return NewWithConfig(config)
+}
+
+func NewWithConfig(config Config) echo.MiddlewareFunc {
+ mergo.Merge(&config, DefaultConfig)
+
+ if config.Rediser == nil {
+ panic(errors.New("redis client is missing"))
+ }
+
+ limiter := go_limiter.NewLimiter(config.Rediser)
+ limit := &go_limiter.Limit{
+ Period: config.Period,
+ Algorithm: config.Algorithm,
+ Rate: int64(config.Max),
+ Burst: int64(config.Burst),
+ }
+
+ return func(next echo.HandlerFunc) echo.HandlerFunc {
+ return func(ctx echo.Context) error {
+ if config.Skipper(ctx) {
+ return next(ctx)
+ }
+
+ result, err := limiter.Allow(config.Key(ctx), limit)
+ if err != nil {
+ ctx.Logger().Error(err)
+
+ return next(ctx)
+ }
+
+ res := ctx.Response()
+
+ // Check if hits exceed the max
+ if !result.Allowed {
+ // Return response with Retry-After header
+ // https://tools.ietf.org/html/rfc6584
+ res.Header().Set("Retry-After", strconv.FormatInt(time.Now().Add(result.RetryAfter).Unix(), 10))
+ // Call Handler func
+ return config.Handler(ctx)
+ }
+
+ // We can continue, update RateLimit headers
+ res.Header().Set("X-RateLimit-Limit", strconv.Itoa(config.Max))
+ res.Header().Set("X-RateLimit-Remaining", strconv.FormatInt(result.Remaining, 10))
+ res.Header().Set("X-RateLimit-Reset", strconv.FormatInt(time.Now().Add(result.ResetAfter).Unix(), 10))
+
+ return next(ctx)
+ }
+ }
+}