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feat: add bandwidth limiter in Route
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| package limiter | ||
|
|
||
| import ( | ||
| "strconv" | ||
| "strings" | ||
|
|
||
| E "github.com/sagernet/sing/common/exceptions" | ||
| ) | ||
|
|
||
| const ( | ||
| KB = 1024 | ||
| MB = 1024 * KB | ||
| GB = 1024 * MB | ||
| ) | ||
|
|
||
| type Bandwidth struct { | ||
| s string // KB MB GB | ||
| i uint64 // bytes | ||
| } | ||
|
|
||
| func NewBandwidth(s string) (bw Bandwidth, err error) { | ||
| err = bw.Parse(s) | ||
| if err != nil { | ||
| return | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func (bw *Bandwidth) Equal(other *Bandwidth) bool { | ||
| if bw == nil && other == nil { | ||
| return true | ||
| } | ||
| if bw != nil && other != nil { | ||
| return bw.i == other.i | ||
| } | ||
| return false | ||
| } | ||
|
|
||
| func (bw *Bandwidth) Bytes() uint64 { | ||
| return bw.i | ||
| } | ||
|
|
||
| func (bw *Bandwidth) String() string { | ||
| return bw.s | ||
| } | ||
|
|
||
| func (bw *Bandwidth) Parse(s string) (err error) { | ||
| s = strings.TrimSpace(s) | ||
| if s == "" { | ||
| return | ||
| } | ||
|
|
||
| var ( | ||
| unit uint64 | ||
| cstr string | ||
| ) | ||
| switch { | ||
| case strings.HasSuffix(s, "KB"): | ||
| unit = KB | ||
| cstr = strings.TrimSuffix(s, "KB") | ||
| case strings.HasSuffix(s, "MB"): | ||
| unit = MB | ||
| cstr = strings.TrimSuffix(s, "MB") | ||
| case strings.HasSuffix(s, "GB"): | ||
| unit = GB | ||
| cstr = strings.TrimSuffix(s, "GB") | ||
| default: | ||
| return E.New("invalid bandwidth value: ", s) | ||
| } | ||
| cnt, err := strconv.ParseUint(cstr, 10, 64) | ||
| if err != nil { | ||
| return | ||
| } | ||
| bw.s = s | ||
| bw.i = cnt * unit | ||
| return | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| package limiter | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "sync" | ||
|
|
||
| "golang.org/x/time/rate" | ||
| ) | ||
|
|
||
| var m sync.Map | ||
|
|
||
| type limiter struct { | ||
| downloadLimiter *rate.Limiter | ||
| uploadLimiter *rate.Limiter | ||
| } | ||
|
|
||
| func newLimiter(download, upload uint64) *limiter { | ||
| var downloadLimiter, uploadLimiter *rate.Limiter | ||
| if download > 0 { | ||
| downloadLimiter = rate.NewLimiter(rate.Limit(float64(download)), int(download)) | ||
| } | ||
| if upload > 0 { | ||
| uploadLimiter = rate.NewLimiter(rate.Limit(float64(upload)), int(upload)) | ||
| } | ||
| return &limiter{downloadLimiter: downloadLimiter, uploadLimiter: uploadLimiter} | ||
| } | ||
|
|
||
| type connWithLimiter struct { | ||
| net.Conn | ||
| limiter *limiter | ||
| ctx context.Context | ||
| } | ||
|
|
||
| func NewConnWithLimiter(ctx context.Context, conn net.Conn, key string, global bool, download, upload uint64) net.Conn { | ||
| var l *limiter | ||
| if !global { | ||
| l = newLimiter(download, upload) | ||
| } else { | ||
| if v, ok := m.Load(key); ok { | ||
| l = v.(*limiter) | ||
| } else { | ||
| l = newLimiter(download, upload) | ||
| m.Store(key, l) | ||
| } | ||
| } | ||
| return &connWithLimiter{Conn: conn, limiter: l, ctx: ctx} | ||
| } | ||
|
|
||
| func (conn *connWithLimiter) Read(p []byte) (n int, err error) { | ||
| if conn.limiter == nil || conn.limiter.downloadLimiter == nil { | ||
| return conn.Conn.Read(p) | ||
| } | ||
| b := conn.limiter.downloadLimiter.Burst() | ||
| if b < len(p) { | ||
| p = p[:b] | ||
| } | ||
| n, err = conn.Conn.Read(p) | ||
| if err != nil { | ||
| return | ||
| } | ||
| err = conn.limiter.downloadLimiter.WaitN(conn.ctx, n) | ||
| if err != nil { | ||
| return | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func (conn *connWithLimiter) Write(p []byte) (n int, err error) { | ||
| if conn.limiter == nil || conn.limiter.uploadLimiter == nil { | ||
| return conn.Conn.Write(p) | ||
| } | ||
| var nn int | ||
| b := conn.limiter.uploadLimiter.Burst() | ||
| for { | ||
| end := len(p) | ||
| if end == 0 { | ||
| break | ||
| } | ||
| if b < len(p) { | ||
| end = b | ||
| } | ||
| err = conn.limiter.uploadLimiter.WaitN(conn.ctx, end) | ||
| if err != nil { | ||
| return | ||
| } | ||
| nn, err = conn.Conn.Write(p[:end]) | ||
| n += nn | ||
| if err != nil { | ||
| return | ||
| } | ||
| p = p[end:] | ||
| } | ||
| return | ||
| } |
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