redis

Documentation

Overview

Package redis provides tracing functions for tracing the go-redis/redis package (https://github.com/go-redis/redis).

Example

To start tracing Redis, simply create a new client using the library and continue using as you normally would.

package main

import (
	"context"

	"github.com/go-redis/redis"
	redistrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/go-redis/redis"
	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
	"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)

func main() {
	// create a new Client
	opts := &redis.Options{Addr: "127.0.0.1", Password: "", DB: 0}
	c := redistrace.NewClient(opts)

	// any action emits a span
	c.Set("test_key", "test_value", 0)

	// optionally, create a new root span
	root, ctx := tracer.StartSpanFromContext(context.Background(), "parent.request",
		tracer.SpanType(ext.SpanTypeRedis),
		tracer.ServiceName("web"),
		tracer.ResourceName("/home"),
	)

	// set the context on the client
	c = c.WithContext(ctx)

	// commit further commands, which will inherit from the parent in the context.
	c.Set("food", "cheese", 0)
	root.Finish()
}

Example (Pipeliner)

You can also trace Redis Pipelines. Simply use as usual and the traces will be automatically picked up by the underlying implementation.

package main

import (
	"time"

	"github.com/go-redis/redis"
	redistrace "gopkg.in/DataDog/dd-trace-go.v1/contrib/go-redis/redis"
)

func main() {
	// create a client
	opts := &redis.Options{Addr: "127.0.0.1", Password: "", DB: 0}
	c := redistrace.NewClient(opts, redistrace.WithServiceName("my-redis-service"))

	// open the pipeline
	pipe := c.Pipeline()

	// submit some commands
	pipe.Incr("pipeline_counter")
	pipe.Expire("pipeline_counter", time.Hour)

	// execute with trace
	pipe.Exec()
}

Index

• type Client
  • func NewClient(opt *redis.Options, opts ...ClientOption) *Client
  • func WrapClient(c *redis.Client, opts ...ClientOption) *Client
  • func (c *Client) Context() context.Context
  • func (c *Client) Pipeline() redis.Pipeliner
  • func (c *Client) WithContext(ctx context.Context) *Client
• type ClientOption
  • func WithAnalytics(on bool) ClientOption
  • func WithAnalyticsRate(rate float64) ClientOption
  • func WithServiceName(name string) ClientOption
• type Pipeliner
  • func (c *Pipeliner) Exec() ([]redis.Cmder, error)
  • func (c *Pipeliner) ExecWithContext(ctx context.Context) ([]redis.Cmder, error)

Examples

• Package
• Package (Pipeliner)

Types

type Client

type Client struct {
	*redis.Client
	// contains filtered or unexported fields
}

Client is used to trace requests to a redis server.

func NewClient

func NewClient(opt *redis.Options, opts ...ClientOption) *Client

NewClient returns a new Client that is traced with the default tracer under the service name "redis".

func WrapClient

func WrapClient(c *redis.Client, opts ...ClientOption) *Client

WrapClient wraps a given redis.Client with a tracer under the given service name.

func (*Client) Context

func (c *Client) Context() context.Context

Context returns the active context in the client.

func (*Client) Pipeline

func (c *Client) Pipeline() redis.Pipeliner

Pipeline creates a Pipeline from a Client

func (*Client) WithContext

func (c *Client) WithContext(ctx context.Context) *Client

WithContext sets a context on a Client. Use it to ensure that emitted spans have the correct parent.

type ClientOption

type ClientOption func(*clientConfig)

ClientOption represents an option that can be used to create or wrap a client.

func WithAnalytics

func WithAnalytics(on bool) ClientOption

WithAnalytics enables Trace Analytics for all started spans.

func WithAnalyticsRate

func WithAnalyticsRate(rate float64) ClientOption

WithAnalyticsRate sets the sampling rate for Trace Analytics events correlated to started spans.

func WithServiceName

func WithServiceName(name string) ClientOption

WithServiceName sets the given service name for the client.

type Pipeliner

type Pipeliner struct {
	redis.Pipeliner
	// contains filtered or unexported fields
}

Pipeliner is used to trace pipelines executed on a Redis server.

func (*Pipeliner) Exec

func (c *Pipeliner) Exec() ([]redis.Cmder, error)

Exec calls Pipeline.Exec() ensuring that the resulting Redis calls are traced.

func (*Pipeliner) ExecWithContext

func (c *Pipeliner) ExecWithContext(ctx context.Context) ([]redis.Cmder, error)

ExecWithContext calls Pipeline.Exec(). It ensures that the resulting Redis calls are traced, and that emitted spans are children of the given Context.