diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml index 56c1225..0afc611 100644 --- a/.github/workflows/ci.yml +++ b/.github/workflows/ci.yml @@ -33,5 +33,8 @@ jobs: - name: Build example run: cd ./_example && go build -v ./ + - name: Check ulimit + run: ulimit -n + - name: Test - run: go test -v ./... + run: go test -v -count=10 ./... diff --git a/_example/go.mod b/_example/go.mod index e29c047..02b6bca 100644 --- a/_example/go.mod +++ b/_example/go.mod @@ -5,10 +5,26 @@ go 1.22.5 replace github.com/go-chi/httprate-redis => ../ require ( + github.com/go-chi/chi/v5 v5.1.0 + github.com/go-chi/httprate v0.12.0 + github.com/go-chi/httprate-redis v0.3.0 + github.com/go-chi/telemetry v0.3.4 +) + +require ( + github.com/beorn7/perks v1.0.1 // indirect github.com/cespare/xxhash/v2 v2.3.0 // indirect github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect - github.com/go-chi/chi/v5 v5.1.0 // indirect - github.com/go-chi/httprate v0.11.0 // indirect - github.com/go-chi/httprate-redis v0.3.0 // indirect + github.com/golang/mock v1.6.0 // indirect + github.com/pkg/errors v0.9.1 // indirect + github.com/prometheus/client_golang v1.19.0 // indirect + github.com/prometheus/client_model v0.6.1 // indirect + github.com/prometheus/common v0.52.3 // indirect + github.com/prometheus/procfs v0.13.0 // indirect github.com/redis/go-redis/v9 v9.6.1 // indirect + github.com/twmb/murmur3 v1.1.8 // indirect + github.com/uber-go/tally/v4 v4.1.16 // indirect + go.uber.org/atomic v1.11.0 // indirect + golang.org/x/sys v0.19.0 // indirect + google.golang.org/protobuf v1.33.0 // indirect ) diff --git a/_example/go.sum b/_example/go.sum index 0c9262f..91e2933 100644 --- a/_example/go.sum +++ b/_example/go.sum @@ -1,12 +1,203 @@ +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= 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h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/_example/main.go b/_example/main.go index 1f189be..6d1250e 100644 --- a/_example/main.go +++ b/_example/main.go @@ -9,31 +9,53 @@ import ( "github.com/go-chi/chi/v5/middleware" "github.com/go-chi/httprate" httprateredis "github.com/go-chi/httprate-redis" + "github.com/go-chi/telemetry" ) func main() { r := chi.NewRouter() r.Use(middleware.Logger) + // Expose Prometheus endpoint at /metrics path. + r.Use(telemetry.Collector(telemetry.Config{AllowAny: true})) + + rc, _ := httprateredis.NewRedisLimitCounter(&httprateredis.Config{ + Host: "127.0.0.1", Port: 6379, + }) + r.Group(func(r chi.Router) { + // Set an extra header demonstrating which backend is currently + // in use (redis vs. local in-memory fallback). + r.Use(func(next http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + if rc.IsFallbackActivated() { + w.Header().Set("X-RateLimit-Backend", "in-memory") + } else { + w.Header().Set("X-RateLimit-Backend", "redis") + } + next.ServeHTTP(w, r) + }) + }) + + // Rate-limit at 50 req/s per IP address. r.Use(httprate.Limit( - 5, - time.Minute, + 50, time.Second, httprate.WithKeyByIP(), httprateredis.WithRedisLimitCounter(&httprateredis.Config{ Host: "127.0.0.1", Port: 6379, }), + httprate.WithLimitCounter(rc), )) r.Get("/", func(w http.ResponseWriter, r *http.Request) { - w.Write([]byte("5 req/min\n")) + w.Write([]byte("ok\n")) }) }) - log.Printf("Serving at localhost:3333") + log.Printf("Serving at http://localhost:3333, rate-limited at 50 req/s per IP address") log.Println() - log.Printf("Try running:") - log.Printf("curl -v http://localhost:3333") + log.Printf("Try making 55 requests:") + log.Println(`curl -s -o /dev/null -w "Request #%{xfer_id} => Response HTTP %{http_code} (backend: %header{X-Ratelimit-Backend}, limit: %header{X-Ratelimit-Limit}, remaining: %header{X-Ratelimit-Remaining})\n" "http://localhost:3333?req=[0-54]"`) http.ListenAndServe(":3333", r) } diff --git a/config.go b/config.go new file mode 100644 index 0000000..7ce25e9 --- /dev/null +++ b/config.go @@ -0,0 +1,36 @@ +package httprateredis + +import ( + "time" + + "github.com/redis/go-redis/v9" +) + +type Config struct { + Disabled bool `toml:"disabled"` // default: false + + WindowLength time.Duration `toml:"window_length"` // default: 1m + ClientName string `toml:"client_name"` // default: os.Args[0] + PrefixKey string `toml:"prefix_key"` // default: "httprate" + + // Disable the use of the local in-memory fallback mechanism. When enabled, + // the system will return HTTP 428 for all requests when Redis is down. + FallbackDisabled bool `toml:"fallback_disabled"` // default: false + + // Timeout for each Redis command after which we fall back to a local + // in-memory counter. If Redis does not respond within this duration, + // the system will use the local counter unless it is explicitly disabled. + FallbackTimeout time.Duration `toml:"fallback_timeout"` // default: 50ms + + // Client if supplied will be used and the below fields will be ignored. + // + // NOTE: It's recommended to set short dial/read/write timeouts and disable + // retries on the client, so the local in-memory fallback can activate quickly. + Client *redis.Client `toml:"-"` + Host string `toml:"host"` + Port uint16 `toml:"port"` + Password string `toml:"password"` // optional + DBIndex int `toml:"db_index"` // default: 0 + MaxIdle int `toml:"max_idle"` // default: 4 + MaxActive int `toml:"max_active"` // default: 8 +} diff --git a/conn.go b/conn.go deleted file mode 100644 index 9ba680c..0000000 --- a/conn.go +++ /dev/null @@ -1,18 +0,0 @@ -package httprateredis - -import "github.com/redis/go-redis/v9" - -type Config struct { - // Client if supplied will be used and below fields will be ignored. - Client *redis.Client `toml:"-"` - Host string `toml:"host"` - Port uint16 `toml:"port"` - Password string `toml:"password"` // optional - DBIndex int `toml:"db_index"` // default 0 - MaxIdle int `toml:"max_idle"` // default 4 - MaxActive int `toml:"max_active"` // default 8 - - ClientName string `toml:"client_name"` // default os.Args[0] - Disabled bool `toml:"disabled"` // default false - PrefixKey string `toml:"prefix_key"` // default "httprate" -} diff --git a/go.mod b/go.mod index cee0bd5..412598e 100644 --- a/go.mod +++ b/go.mod @@ -3,12 +3,12 @@ module github.com/go-chi/httprate-redis go 1.19 require ( - github.com/go-chi/httprate v0.9.0 - github.com/redis/go-redis/v9 v9.6.0 + github.com/go-chi/httprate v0.12.0 + github.com/redis/go-redis/v9 v9.6.1 + golang.org/x/sync v0.7.0 ) require ( github.com/cespare/xxhash/v2 v2.3.0 // indirect github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect - golang.org/x/sync v0.7.0 // indirect ) diff --git a/go.sum b/go.sum index f759553..5e2ed0f 100644 --- a/go.sum +++ b/go.sum @@ -1,18 +1,14 @@ github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs= github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA= -github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44= -github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs= github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78= github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc= -github.com/go-chi/httprate v0.8.0 h1:CyKng28yhGnlGXH9EDGC/Qizj29afJQSNW15W/yj34o= -github.com/go-chi/httprate v0.8.0/go.mod h1:6GOYBSwnpra4CQfAKXu8sQZg+nZ0M1g9QnyFvxrAB8A= -github.com/go-chi/httprate v0.9.0 h1:21A+4WDMDA5FyWcg7mNrhj63aNT8CGh+Z1alOE/piU8= -github.com/go-chi/httprate v0.9.0/go.mod h1:6GOYBSwnpra4CQfAKXu8sQZg+nZ0M1g9QnyFvxrAB8A= -github.com/redis/go-redis/v9 v9.3.0 h1:RiVDjmig62jIWp7Kk4XVLs0hzV6pI3PyTnnL0cnn0u0= -github.com/redis/go-redis/v9 v9.3.0/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M= +github.com/go-chi/httprate v0.12.0 h1:08D/te3pOTJe5+VAZTQrHxwdsH2NyliiUoRD1naKaMg= +github.com/go-chi/httprate v0.12.0/go.mod h1:TUepLXaz/pCjmCtf/obgOQJ2Sz6rC8fSf5cAt5cnTt0= github.com/redis/go-redis/v9 v9.6.0 h1:NLck+Rab3AOTHw21CGRpvQpgTrAU4sgdCswqGtlhGRA= github.com/redis/go-redis/v9 v9.6.0/go.mod h1:hdY0cQFCN4fnSYT6TkisLufl/4W5UIXyv0b/CLO2V2M= +github.com/redis/go-redis/v9 v9.6.1 h1:HHDteefn6ZkTtY5fGUE8tj8uy85AHk6zP7CpzIAM0y4= +github.com/redis/go-redis/v9 v9.6.1/go.mod h1:0C0c6ycQsdpVNQpxb1njEQIqkx5UcsM8FJCQLgE9+RA= golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M= golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk= diff --git a/httprateredis.go b/httprateredis.go index 7cf3657..a9ca6f0 100644 --- a/httprateredis.go +++ b/httprateredis.go @@ -2,10 +2,13 @@ package httprateredis import ( "context" + "errors" "fmt" + "net" "os" "path/filepath" "strconv" + "sync/atomic" "time" "github.com/go-chi/httprate" @@ -16,14 +19,11 @@ func WithRedisLimitCounter(cfg *Config) httprate.Option { if cfg.Disabled { return httprate.WithNoop() } - rc, err := NewRedisLimitCounter(cfg) - if err != nil { - panic(err) - } + rc, _ := NewRedisLimitCounter(cfg) return httprate.WithLimitCounter(rc) } -func NewRedisLimitCounter(cfg *Config) (httprate.LimitCounter, error) { +func NewRedisLimitCounter(cfg *Config) (*redisCounter, error) { if cfg == nil { cfg = &Config{} } @@ -39,82 +39,101 @@ func NewRedisLimitCounter(cfg *Config) (httprate.LimitCounter, error) { if cfg.PrefixKey == "" { cfg.PrefixKey = "httprate" } - - c, err := newClient(cfg) - if err != nil { - return nil, err - } - return &redisCounter{ - client: c, - prefixKey: cfg.PrefixKey, - }, nil -} - -func newClient(cfg *Config) (*redis.Client, error) { - if cfg.Client != nil { - return cfg.Client, nil - } - - var maxIdle, maxActive = cfg.MaxIdle, cfg.MaxActive - if maxIdle <= 0 { - maxIdle = 20 - } - if maxActive <= 0 { - maxActive = 50 + if cfg.FallbackTimeout == 0 { + // Activate local in-memory fallback fairly quickly, as this would slow down all requests. + cfg.FallbackTimeout = 100 * time.Millisecond } - address := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port) - c := redis.NewClient(&redis.Options{ - Addr: address, - Password: cfg.Password, - DB: cfg.DBIndex, - PoolSize: maxActive, - MaxIdleConns: maxIdle, - ClientName: cfg.ClientName, - }) - - status := c.Ping(context.Background()) - if status == nil || status.Err() != nil { - return nil, fmt.Errorf("httprateredis: unable to dial redis host %v", address) + rc := &redisCounter{ + prefixKey: cfg.PrefixKey, } - - return c, nil + if !cfg.FallbackDisabled { + rc.fallbackCounter = httprate.NewLocalLimitCounter(cfg.WindowLength) + } + + if cfg.Client == nil { + maxIdle, maxActive := cfg.MaxIdle, cfg.MaxActive + if maxIdle < 1 { + maxIdle = 20 + } + if maxActive < 1 { + maxActive = 50 + } + + rc.client = redis.NewClient(&redis.Options{ + Addr: fmt.Sprintf("%s:%d", cfg.Host, cfg.Port), + Password: cfg.Password, + DB: cfg.DBIndex, + ClientName: cfg.ClientName, + DisableIndentity: true, + + DialTimeout: 2 * cfg.FallbackTimeout, + ReadTimeout: cfg.FallbackTimeout, + WriteTimeout: cfg.FallbackTimeout, + PoolSize: maxActive, + MinIdleConns: 1, + MaxIdleConns: maxIdle, + MaxRetries: -1, // -1 disables retries + }) + } + + return rc, nil } type redisCounter struct { - client *redis.Client - windowLength time.Duration - prefixKey string + client *redis.Client + windowLength time.Duration + prefixKey string + fallbackActivated atomic.Bool + fallbackCounter httprate.LimitCounter } -var _ httprate.LimitCounter = &redisCounter{} +var _ httprate.LimitCounter = (*redisCounter)(nil) func (c *redisCounter) Config(requestLimit int, windowLength time.Duration) { c.windowLength = windowLength + if c.fallbackCounter != nil { + c.fallbackCounter.Config(requestLimit, windowLength) + } } func (c *redisCounter) Increment(key string, currentWindow time.Time) error { return c.IncrementBy(key, currentWindow, 1) } -func (c *redisCounter) IncrementBy(key string, currentWindow time.Time, amount int) error { +func (c *redisCounter) IncrementBy(key string, currentWindow time.Time, amount int) (err error) { + if c.fallbackCounter != nil { + if c.fallbackActivated.Load() { + return c.fallbackCounter.IncrementBy(key, currentWindow, amount) + } + defer func() { + if err != nil { + // On redis network error, fallback to local in-memory counter. + var netErr net.Error + if errors.As(err, &netErr) || errors.Is(err, redis.ErrClosed) { + c.fallback() + err = c.fallbackCounter.IncrementBy(key, currentWindow, amount) + } + } + }() + } + + // Note: Timeouts are set up directly on the Redis client. ctx := context.Background() - conn := c.client hkey := c.limitCounterKey(key, currentWindow) - pipe := conn.TxPipeline() + pipe := c.client.TxPipeline() incrCmd := pipe.IncrBy(ctx, hkey, int64(amount)) expireCmd := pipe.Expire(ctx, hkey, c.windowLength*3) - _, err := pipe.Exec(ctx) + + _, err = pipe.Exec(ctx) if err != nil { return fmt.Errorf("httprateredis: redis transaction failed: %w", err) } - if err := incrCmd.Err(); err != nil { return fmt.Errorf("httprateredis: redis incr failed: %w", err) } - if err := expireCmd.Err(); err != nil { return fmt.Errorf("httprateredis: redis expire failed: %w", err) } @@ -122,22 +141,36 @@ func (c *redisCounter) IncrementBy(key string, currentWindow time.Time, amount i return nil } -func (c *redisCounter) Get(key string, currentWindow, previousWindow time.Time) (int, int, error) { +func (c *redisCounter) Get(key string, currentWindow, previousWindow time.Time) (curr int, prev int, err error) { + if c.fallbackCounter != nil { + if c.fallbackActivated.Load() { + return c.fallbackCounter.Get(key, currentWindow, previousWindow) + } + defer func() { + if err != nil { + // On redis network error, fallback to local in-memory counter. + var netErr net.Error + if errors.As(err, &netErr) || errors.Is(err, redis.ErrClosed) { + c.fallback() + curr, prev, err = c.fallbackCounter.Get(key, currentWindow, previousWindow) + } + } + }() + } + + // Note: Timeouts are set up directly on the Redis client. ctx := context.Background() - conn := c.client currKey := c.limitCounterKey(key, currentWindow) prevKey := c.limitCounterKey(key, previousWindow) - values, err := conn.MGet(ctx, currKey, prevKey).Result() + values, err := c.client.MGet(ctx, currKey, prevKey).Result() if err != nil { return 0, 0, fmt.Errorf("httprateredis: redis mget failed: %w", err) } else if len(values) != 2 { return 0, 0, fmt.Errorf("httprateredis: redis mget returned wrong number of keys: %v, expected 2", len(values)) } - var curr, prev int - // MGET always returns slice with nil or "string" values, even if the values // were created with the INCR command. Ignore error if we can't parse the number. if values[0] != nil { @@ -152,6 +185,32 @@ func (c *redisCounter) Get(key string, currentWindow, previousWindow time.Time) return curr, prev, nil } +func (c *redisCounter) IsFallbackActivated() bool { + return c.fallbackActivated.Load() +} + +func (c *redisCounter) fallback() { + // Activate the in-memory counter fallback, unless activated by some other goroutine. + fallbackAlreadyActivated := c.fallbackActivated.Swap(true) + if fallbackAlreadyActivated { + return + } + + go c.reconnect() +} + +func (c *redisCounter) reconnect() { + // Try to re-connect to redis every 200ms. + for { + err := c.client.Ping(context.Background()).Err() + if err == nil { + c.fallbackActivated.Store(false) + return + } + time.Sleep(200 * time.Millisecond) + } +} + func (c *redisCounter) limitCounterKey(key string, window time.Time) string { return fmt.Sprintf("%s:%d", c.prefixKey, httprate.LimitCounterKey(key, window)) } diff --git a/httprateredis_test.go b/httprateredis_test.go index 6d0d790..36fefbb 100644 --- a/httprateredis_test.go +++ b/httprateredis_test.go @@ -13,13 +13,15 @@ import ( func TestRedisCounter(t *testing.T) { limitCounter, err := httprateredis.NewRedisLimitCounter(&httprateredis.Config{ - Host: "localhost", - Port: 6379, - MaxIdle: 500, - MaxActive: 500, - DBIndex: 0, - ClientName: "httprateredis_test", - PrefixKey: fmt.Sprintf("httprate:test:%v", rand.Int31n(100000)), // Unique key for each test + Host: "localhost", + Port: 6379, + MaxIdle: 100, + MaxActive: 200, + DBIndex: 0, + ClientName: "httprateredis_test", + PrefixKey: fmt.Sprintf("httprate:test:%v", rand.Int31n(100000)), // Unique Redis key for each test + FallbackTimeout: time.Second, + FallbackDisabled: true, }) if err != nil { t.Fatalf("redis not available: %v", err) @@ -45,7 +47,7 @@ func TestRedisCounter(t *testing.T) { curr: 0, }, { - name: "t=0m: increment 1", + name: "t=0m: increment by 1", incrBy: 1, prev: 0, curr: 1,