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mcp: use golang.org/x/time/rate for LoggingHandler rate limiting (#927)

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Replaces the simple time-interval check in `LoggingHandler` with a
standard `rate.Limiter` from `golang.org/x/time/rate`, as suggested by
the existing TODO comment.

This provides a well-tested implementation and removes the need for
manual `lastMessageSent` tracking. The rate (`1/MinInterval`) and burst
(1) match the previous behavior exactly.

/cc @jba

Closes #924

---------

Signed-off-by: wucm667 <stevenwucongmin@gmail.com>
Co-authored-by: Jonathan Amsterdam <jba@users.noreply.github.com>
Co-authored-by: Maciej Kisiel <mkisiel@google.com>
This commit is contained in:
wucm667 2026-05-06 16:31:01 +08:00 • committed by GitHub
commit 9604499eed
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3 changed files with 13 additions and 13 deletions
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1
go.mod
View file

@ -9,6 +9,7 @@ require (
github.com/segmentio/encoding v0.5.4
github.com/yosida95/uritemplate/v3 v3.0.2
golang.org/x/oauth2 v0.35.0
golang.org/x/time v0.15.0
golang.org/x/tools v0.42.0
)

2
go.sum
View file

@ -14,5 +14,7 @@ golang.org/x/oauth2 v0.35.0 h1:Mv2mzuHuZuY2+bkyWXIHMfhNdJAdwW3FuWeCPYN5GVQ=
golang.org/x/oauth2 v0.35.0/go.mod h1:lzm5WQJQwKZ3nwavOZ3IS5Aulzxi68dUSgRHujetwEA=
golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
golang.org/x/time v0.15.0 h1:bbrp8t3bGUeFOx08pvsMYRTCVSMk89u4tKbNOZbp88U=
golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=

23
mcp/logging.go
View file

@ -13,6 +13,8 @@ import (
"slices"
"sync"
"time"
"golang.org/x/time/rate"
)
// Logging levels.
@ -83,10 +85,10 @@ type LoggingHandler struct {
// Ensures that the buffer reset is atomic with the write (see Handle).
// A pointer so that clones share the mutex. See
// https://github.com/golang/example/blob/master/slog-handler-guide/README.md#getting-the-mutex-right.
mu *sync.Mutex
lastMessageSent time.Time // for rate-limiting
buf *bytes.Buffer
handler slog.Handler
mu *sync.Mutex
limiter *rate.Limiter // for rate-limiting
buf *bytes.Buffer
handler slog.Handler
}
// ensureLogger returns l if non-nil, otherwise a discard logger.
@ -118,6 +120,9 @@ func NewLoggingHandler(ss *ServerSession, opts *LoggingHandlerOptions) *LoggingH
}
if opts != nil {
lh.opts = *opts
if opts.MinInterval > 0 {
lh.limiter = rate.NewLimiter(rate.Every(opts.MinInterval), 1)
}
}
return lh
}
@ -157,11 +162,7 @@ func (h *LoggingHandler) Handle(ctx context.Context, r slog.Record) error {
func (h *LoggingHandler) handle(ctx context.Context, r slog.Record) error {
// Observe the rate limit.
// TODO(jba): use golang.org/x/time/rate.
h.mu.Lock()
skip := time.Since(h.lastMessageSent) < h.opts.MinInterval
h.mu.Unlock()
if skip {
if h.limiter != nil && !h.limiter.Allow() {
return nil
}
@ -184,10 +185,6 @@ func (h *LoggingHandler) handle(ctx context.Context, r slog.Record) error {
return err
}
h.mu.Lock()
h.lastMessageSent = time.Now()
h.mu.Unlock()
params := &LoggingMessageParams{
Logger: h.opts.LoggerName,
Level: slogLevelToMCP(r.Level),