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Optimize Otel instrumentation

This commit is contained in:
Vladimir Mihailenco 2021-03-20 10:01:48 +02:00
parent 7c5bbc37bd
commit 1b77706c0c
4 changed files with 124 additions and 123 deletions
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11
internal/pool/conn.go
View File

@ -9,7 +9,6 @@ import (
"github.com/go-redis/redis/v8/internal"
"github.com/go-redis/redis/v8/internal/proto"
"go.opentelemetry.io/otel/trace"
)
var noDeadline = time.Time{}
@ -66,7 +65,9 @@ func (cn *Conn) RemoteAddr() net.Addr {
}
func (cn *Conn) WithReader(ctx context.Context, timeout time.Duration, fn func(rd *proto.Reader) error) error {
return internal.WithSpan(ctx, "redis.with_reader", func(ctx context.Context, span trace.Span) error {
ctx, span := internal.StartSpan(ctx, "redis.with_reader")
defer span.End()
if err := cn.netConn.SetReadDeadline(cn.deadline(ctx, timeout)); err != nil {
return internal.RecordError(ctx, span, err)
}
@ -74,13 +75,14 @@ func (cn *Conn) WithReader(ctx context.Context, timeout time.Duration, fn func(r
return internal.RecordError(ctx, span, err)
}
return nil
})
}
func (cn *Conn) WithWriter(
ctx context.Context, timeout time.Duration, fn func(wr *proto.Writer) error,
) error {
return internal.WithSpan(ctx, "redis.with_writer", func(ctx context.Context, span trace.Span) error {
ctx, span := internal.StartSpan(ctx, "redis.with_writer")
defer span.End()
if err := cn.netConn.SetWriteDeadline(cn.deadline(ctx, timeout)); err != nil {
return internal.RecordError(ctx, span, err)
}
@ -100,7 +102,6 @@ func (cn *Conn) WithWriter(
internal.WritesCounter.Add(ctx, 1)
return nil
})
}
func (cn *Conn) Close() error {

15
internal/util.go
View File

@ -11,7 +11,9 @@ import (
)
func Sleep(ctx context.Context, dur time.Duration) error {
return WithSpan(ctx, "time.Sleep", func(ctx context.Context, span trace.Span) error {
_, span := StartSpan(ctx, "time.Sleep")
defer span.End()
t := time.NewTimer(dur)
defer t.Stop()
@ -21,7 +23,6 @@ func Sleep(ctx context.Context, dur time.Duration) error {
case <-ctx.Done():
return ctx.Err()
}
})
}
func ToLower(s string) string {
@ -54,15 +55,11 @@ func isLower(s string) bool {
var tracer = otel.Tracer("github.com/go-redis/redis")
func WithSpan(ctx context.Context, name string, fn func(context.Context, trace.Span) error) error {
func StartSpan(ctx context.Context, name string) (context.Context, trace.Span) {
if span := trace.SpanFromContext(ctx); !span.IsRecording() {
return fn(ctx, span)
return ctx, span
}
ctx, span := tracer.Start(ctx, name)
defer span.End()
return fn(ctx, span)
return tracer.Start(ctx, name)
}
func RecordError(ctx context.Context, span trace.Span, err error) error {

22
options.go
View File

@ -15,7 +15,6 @@ import (
"github.com/go-redis/redis/v8/internal"
"github.com/go-redis/redis/v8/internal/pool"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
// Limiter is the interface of a rate limiter or a circuit breaker.
@ -292,20 +291,21 @@ func getUserPassword(u *url.URL) (string, string) {
func newConnPool(opt *Options) *pool.ConnPool {
return pool.NewConnPool(&pool.Options{
Dialer: func(ctx context.Context) (net.Conn, error) {
var conn net.Conn
err := internal.WithSpan(ctx, "redis.dial", func(ctx context.Context, span trace.Span) error {
ctx, span := internal.StartSpan(ctx, "redis.dial")
defer span.End()
if span.IsRecording() {
span.SetAttributes(
attribute.String("db.connection_string", opt.Addr),
)
var err error
conn, err = opt.Dialer(ctx, opt.Network, opt.Addr)
if err != nil {
_ = internal.RecordError(ctx, span, err)
}
return err
})
return conn, err
cn, err := opt.Dialer(ctx, opt.Network, opt.Addr)
if err != nil {
return nil, internal.RecordError(ctx, span, err)
}
return cn, nil
},
PoolSize: opt.PoolSize,
MinIdleConns: opt.MinIdleConns,

43
redis.go
View File

@ -11,7 +11,6 @@ import (
"github.com/go-redis/redis/v8/internal/pool"
"github.com/go-redis/redis/v8/internal/proto"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
// Nil reply returned by Redis when key does not exist.
@ -214,10 +213,7 @@ func (c *baseClient) _getConn(ctx context.Context) (*pool.Conn, error) {
return cn, nil
}
err = internal.WithSpan(ctx, "redis.init_conn", func(ctx context.Context, span trace.Span) error {
return c.initConn(ctx, cn)
})
if err != nil {
if err := c.initConn(ctx, cn); err != nil {
c.connPool.Remove(ctx, cn, err)
if err := errors.Unwrap(err); err != nil {
return nil, err
@ -241,6 +237,9 @@ func (c *baseClient) initConn(ctx context.Context, cn *pool.Conn) error {
return nil
}
ctx, span := internal.StartSpan(ctx, "redis.init_conn")
defer span.End()
connPool := pool.NewSingleConnPool(c.connPool, cn)
conn := newConn(ctx, c.opt, connPool)
@ -288,7 +287,9 @@ func (c *baseClient) releaseConn(ctx context.Context, cn *pool.Conn, err error)
func (c *baseClient) withConn(
ctx context.Context, fn func(context.Context, *pool.Conn) error,
) error {
return internal.WithSpan(ctx, "redis.with_conn", func(ctx context.Context, span trace.Span) error {
ctx, span := internal.StartSpan(ctx, "redis.with_conn")
defer span.End()
cn, err := c.getConn(ctx)
if err != nil {
return err
@ -324,7 +325,6 @@ func (c *baseClient) withConn(
case err = <-errc:
return err
}
})
}
func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
@ -332,11 +332,20 @@ func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
for attempt := 0; attempt <= c.opt.MaxRetries; attempt++ {
attempt := attempt
var retry bool
err := internal.WithSpan(ctx, "redis.process", func(ctx context.Context, span trace.Span) error {
retry, err := c._process(ctx, cmd, attempt)
if err == nil || !retry {
return err
}
lastErr = err
}
return lastErr
}
func (c *baseClient) _process(ctx context.Context, cmd Cmder, attempt int) (bool, error) {
if attempt > 0 {
if err := internal.Sleep(ctx, c.retryBackoff(attempt)); err != nil {
return err
return false, err
}
}
@ -360,17 +369,11 @@ func (c *baseClient) process(ctx context.Context, cmd Cmder) error {
return nil
})
if err == nil {
return nil
return false, nil
}
retry = shouldRetry(err, atomic.LoadUint32(&retryTimeout) == 1)
return err
})
if err == nil || !retry {
return err
}
lastErr = err
}
return lastErr
retry := shouldRetry(err, atomic.LoadUint32(&retryTimeout) == 1)
return retry, err
}
func (c *baseClient) retryBackoff(attempt int) time.Duration {