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docs: Update README file to cover redis cache
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@Neurostep
Neurostep committed Apr 19, 2024
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Expand Up @@ -30,6 +30,8 @@ SDK, the Go version.
- [Usage of ORM](#usage-of-orm)
- [PubSub](#pubsub)
- [Kafka specific configuration](#kafka-specific-configuration)
- [Cache](#cache)
- [Redis](#redis-specific-configuration)
- [APM & Instrumentation](#apm---instrumentation)
- [Request ID middleware](#request-id-middleware)
- [HTTP server Request ID middleware](#http-server-request-id-middleware)
Expand All @@ -42,6 +44,8 @@ SDK, the Go version.
- [AWS Session instrumentation](#aws-session-instrumentation)
- [PubSub instrumentation and logging](#pubsub-instrumentation-and-logging)
- [Kafka](#kafka)
- [Cache instrumentation and logging](#cache-instrumentation-and-logging)
- [Redis](#redis)
- [Profiling](#profiling)
- [Custom Metrics](#custom-metrics)
- [Using the `go-sdk` in isolation](#using-the--go-sdk--in-isolation)
Expand Down Expand Up @@ -909,6 +913,63 @@ To authenticate the requests to Kafka, Go SDK provides a configuration set for T
| Assumable role | This role will be used to establish connection to AWS MSK ignoring the static credentials | `role` | `APP_PUBSUB_KAFKA_SASL_AWS_MSK_IAM_ROLE` | string | AWS ARN string |
| Session name | Will be passed to AWS STS when assuming the role | `session_name` | `APP_PUBSUB_KAFKA_SASL_AWS_MSK_IAM_SESSION_NAME` | string | application |

### Cache

`go-sdk` provides a convenient way to create an application Cache configuration.

Top-level configuration is split into sections specific for the vendor. Let's look into the sample `cache.yml` file:

```yaml
common: &common
store: redis
redis:
url: ""
# Set by APP_CACHE_REDIS_ADDRS env variable
addrs:
- "localhost:6379"
# Set by APP_CACHE_REDIS_USERNAME env variable
username: "username"
# Set by APP_CACHE_REDIS_PASSWORD env variable
password: "password"
```

#### Redis specific configuration

Redis top-level configuration is based on the official [go-redis UniversalOptions](https://pkg.go.dev/github.com/redis/go-redis/v9#UniversalOptions) library options. The following table describes the configuration options:

| Setting | Description | YAML variable | Environment variable (ENV) | Type | Possible Values |
|-----------------------|-------------------------------------------------------------------------------------------------------------------------------------|---------------------------|-------------------------------------------|---------------|------------------------------------|
| URL | URL into Redis ClusterOptions that can be used to connect to Redis | `url` | `APP_CACHE_REDIS_URL` | string | redis://:password@localhost:6379/0 |
| Addrs | Either a single address or a seed list of host:port addresses of cluster/sentinel nodes. | `addrs` | `APP_CACHE_REDIS_ADDRS` | list(string) | localhost:6379 |
| ClientName | ClientName will execute the `CLIENT SETNAME ClientName` command for each conn. | `client_name` | `APP_CACHE_REDIS_CLIENT_NAME` | string | client-name |
| DB | Database to be selected after connecting to the server. Only single-node and failover clients. | `db` | `APP_CACHE_REDIS_DB` | int | 0 |
| Protocol | Protocol 2 or 3. Use the version to negotiate RESP version with redis-server. | `protocol` | `APP_CACHE_REDIS_PROTOCOL` | int | 2, 3 |
| Username | Username for Redis authentication. | `username` | `APP_CACHE_REDIS_USERNAME` | string | username |
| Password | Password for Redis authentication. | `password` | `APP_CACHE_REDIS_PASSWORD` | string | password |
| SentinelUsername | SentinelUsername is the username for Sentinel authentication. | `sentinel_username` | `APP_CACHE_REDIS_SENTINEL_USERNAME` | string | sentinel-username |
| SentinelPassword | SentinelPassword is the password for Sentinel authentication. | `sentinel_password` | `APP_CACHE_REDIS_SENTINEL_PASSWORD` | string | sentinel-password |
| MaxRetries | Maximum number of retries before giving up. | `max_retries` | `APP_CACHE_REDIS_MAX_RETRIES` | int | 0 |
| MinRetryBackoff | Minimum backoff between each retry. | `min_retry_backoff` | `APP_CACHE_REDIS_MIN_RETRY_BACKOFF` | time.Duration | 8ms |
| MaxRetryBackoff | Maximum backoff between each retry. | `max_retry_backoff` | `APP_CACHE_REDIS_MAX_RETRY_BACKOFF` | time.Duration | 512ms |
| DialTimeout | The timeout for establishing a connection. | `dial_timeout` | `APP_CACHE_REDIS_DIAL_TIMEOUT` | time.Duration | 5s |
| ReadTimeout | The timeout for socket reads. | `read_timeout` | `APP_CACHE_REDIS_READ_TIMEOUT` | time.Duration | 3s |
| WriteTimeout | The timeout for socket writes. | `write_timeout` | `APP_CACHE_REDIS_WRITE_TIMEOUT` | time.Duration | 3s |
| ContextTimeoutEnabled | Controls whether the client respects context timeouts and deadlines. | `context_timeout_enabled` | `APP_CACHE_REDIS_CONTEXT_TIMEOUT_ENABLED` | bool | true, false |
| PoolSize | Base number of socket connections. | `pool_size` | `APP_CACHE_REDIS_POOL_SIZE` | int | 10 |
| PoolTimeout | Amount of time client waits for connection if all connections are busy before returning an error. | `pool_timeout` | `APP_CACHE_REDIS_POOL_TIMEOUT` | time.Duration | 4s |
| MaxIdleConns | Maximum number of idle connections. | `max_idle_conns` | `APP_CACHE_REDIS_MAX_IDLE_CONNS` | int | 10 |
| MinIdleConns | Minimum number of idle connections. | `min_idle_conns` | `APP_CACHE_REDIS_MIN_IDLE_CONNS` | int | 5 |
| MaxActiveConns | Maximum number of connections allocated by the pool at a given time. | `max_active_conns` | `APP_CACHE_REDIS_MAX_ACTIVE_CONNS` | int | 100 |
| ConnMaxIdleTime | Maximum amount of time a connection may be idle. Should be less than server's timeout. | `conn_max_idle_time` | `APP_CACHE_REDIS_CONN_MAX_IDLE_TIME` | time.Duration | 5m |
| ConnMaxLifetime | Maximum amount of time a connection may be reused. | `conn_max_lifetime` | `APP_CACHE_REDIS_CONN_MAX_LIFETIME` | time.Duration | 5m |
| MaxRedirects | The maximum number of retries before giving up. Command is retried on network errors and MOVED/ASK redirects. Only cluster clients. | `max_redirects` | `APP_CACHE_REDIS_MAX_REDIRECTS` | int | 8 |
| ReadOnly | Enable read-only commands on slave nodes. Only cluster clients. | `read_only` | `APP_CACHE_REDIS_READ_ONLY` | bool | true, false |
| RouteByLatency | Route read-only commands to the closest master or slave node. Only cluster clients. | `route_by_latency` | `APP_CACHE_REDIS_ROUTE_BY_LATENCY` | bool | true, false |
| RouteRandomly | Route read-only commands to a random master or slave node. Only cluster clients. | `route_randomly` | `APP_CACHE_REDIS_ROUTE_RANDOMLY` | bool | true, false |
| MasterName | Name of the master to use for Sentinel failover. | `master_name` | `APP_CACHE_REDIS_MASTER_NAME` | string | master-name |
| DisableIndentity | Disable set-lib on connect. | `disable_indentity` | `APP_CACHE_REDIS_DISABLE_INDENTITY` | bool | true, false |
| IdentitySuffix | Add suffix to client name. | `identity_suffix` | `APP_CACHE_REDIS_IDENTITY_SUFFIX` | string | suffix |

## APM & Instrumentation

The `go-sdk` provides an easy way to add application performance monitoring
Expand Down Expand Up @@ -1250,6 +1311,39 @@ func main() {
}
```

### Cache instrumentation and logging

#### Redis

`go-sdk` provides a flexible way to instrument the Redis client with logging and tracing capabilities.

The [go-redis](https://github.com/redis/go-redis) Redis client library is wrapped by the `go-sdk` using [dd-trace-go](https://github.com/DataDog/dd-trace-go/tree/fda4cc5e15b744b10d378a62e026dc61d35f364a/contrib/redis/go-redis.v9) library and traces calls to Redis.

For logging, `go-sdk` sets the [go-redis](https://pkg.go.dev/github.com/redis/go-redis/v9#SetLogger) logger to the SDK logger. This logger will print `go-redis` log stubs as error log entries.

```go
func main() {
config, err := sdkconfig.NewConfig()
if err != nil {
log.Fatalf("Failed to load SDK config: %s", err)
}
logger, err := sdklogger.NewBuilder(config.Logger).SetTracking(config.Tracking).Build()
if err != nil {
log.Fatalf("Failed to load SDK logger: %s", err)
}
redisClient, err := sdkredis.NewClient(sdkredis.Config{
ApplicationName: applicationName,
Logger: logger,
ClientConfig: config.Cache.Redis,
})
if err != nil {
logger.WithError(err).Fatalf("Failed to create Redis client: %s", err)
}
}
```

### Profiling

You can send `pprof` samples to DataDog by enabling the profiler.
Expand Down

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