Go Gin OpenTelemetry Integration
Installation
Install the APIToolkit gin SDK using the following command go get
command:
go get github.com/apitoolkit/apitoolkit-go/gin
Configuration
Before configuration open telemetery and setting up the APItoolkit middleware, you need to configure a few environment variables. These variables provide essential information for setting up openTelemetry and APItoolkit.
OTEL_RESOURCE_ATTRIBUTES="at-project-key=YOUR_API_KEY" # Your apitoolkit API key
OTEL_SERVICE_NAME="apitoolkit-otel-go-demo" # Service name for your the service you're integrating in
OTEL_SERVICE_VERSION="0.0.1" # Your application's service version
Usage
After setting up the environment variables, you can configure the OpenTelemetry SDK and APItoolkit middleware like so:
package main
import (
"log"
"net/http"
apitoolkit "github.com/apitoolkit/apitoolkit-go/gin"
"github.com/gin-gonic/gin"
_ "github.com/joho/godotenv/autoload" // autoload .env file for otel configuration
)
func main() {
// Configure openTelemetry
shutdown, err := apitoolkit.ConfigureOpenTelemetry()
if err != nil {
log.Printf("error configuring openTelemetry: %v", err)
}
defer shutdown()
router := gin.Default()
// Add the apitoolkit gin middleware to monitor http requests
// And report errors to apitoolkit
router.Use(apitoolkit.Middleware(apitoolkit.Config{
RedactHeaders: []string{"Authorization", "X-Api-Key"},
RedactRequestBody: []string{"password", "credit_card"},
RedactResponseBody: []string{"password", "credit_card"},
}))
router.GET("/greet/:name", func(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{"message": "Hello " + c.Param("name")})
})
router.Run(":8000")
}
Error Reporting
APItoolkit automatically detects different unhandled errors, API issues, and anomalies but you can report and track specific errors at different parts of your application. This will help you associate more detail and context from your backend with any failing customer request.
To manually report specific errors at different parts of your application, use the ReportError()
method, passing in the context
and error
arguments, like so:
package main
import (
"log"
"net/http"
"os"
apitoolkit "github.com/apitoolkit/apitoolkit-go/gin"
"github.com/gin-gonic/gin"
_ "github.com/joho/godotenv/autoload" // autoload .env file for otel configuration
)
func main() {
// Configure openTelemetry
shutdown, err := apitoolkit.ConfigureOpenTelemetry()
if err != nil {
log.Printf("error configuring openTelemetry: %v", err)
}
defer shutdown()
router := gin.New()
router.Use(apitoolkit.Middleware(apitoolkit.Config{}))
router.GET("/", func(c *gin.Context) {
file, err := os.Open("non-existing-file.txt")
if err != nil {
// Report the error to APItoolkit
apitoolkit.ReportError(c.Request.Context(), err)
c.JSON(http.StatusInternalServerError, gin.H{"message": "Something went wrong"})
return
}
c.JSON(http.StatusOK, gin.H{"message": file.Name()})
})
router.Run(":8000")
}
Monitoring Outgoing Requests
Outgoing requests are external API calls you make from your API. By default, APItoolkit monitors all requests users make from your application and they will all appear in the page.
<section class="tab-group" data-tab-group="group1"> <button class="tab-button" data-tab="tab1">Using APItoolkit</button> <button class="tab-button" data-tab="tab2">Using Otel instrumentation</button> <div id="tab1" class="tab-content"> To monitor outgoing HTTP requests from your application, replace the default HTTP client transport with a custom RoundTripper. This allows you to capture and send copies of all incoming and outgoing requests to APItoolkit.
Here's an example of the configuration with a custom RoundTripper:
package main
import (
"log"
"net/http"
apitoolkit "github.com/apitoolkit/apitoolkit-go/gin"
"github.com/gin-gonic/gin"
_ "github.com/joho/godotenv/autoload" // autoload .env file for otel configuration
)
func main() {
// Configure openTelemetry
shutdown, err := apitoolkit.ConfigureOpenTelemetry()
if err != nil {
log.Printf("error configuring openTelemetry: %v", err)
}
defer shutdown()
router := gin.New()
router.Use(apitoolkit.Middleware(apitoolkit.Config{}))
router.GET("/", func(c *gin.Context) {
// Create a new HTTP client
HTTPClient := apitoolkit.HTTPClient(
c.Request.Context(),
apitoolkit.WithRedactHeaders("content-type", "Authorization", "HOST"),
apitoolkit.WithRedactRequestBody("$.user.email", "$.user.addresses"),
apitoolkit.WithRedactResponseBody("$.users[*].email", "$.users[*].credit_card"),
)
// Make an outgoing HTTP request using the modified HTTPClient
_, _ = HTTPClient.Get("https://jsonplaceholder.typicode.com/posts/1")
c.String(http.StatusOK, "Ok, success!")
})
router.Run(":8000")
}
<div class="callout"> <p><i class="fa-regular fa-lightbulb"></i> <b>Tip</b></p> <p class="mt-6">You can also redact data with the custom RoundTripper for outgoing requests.</p> </div>
</div>
<div id="tab2" class="tab-content"> You can also use an otel instrumentation library to monitor outgoing requests from your server, but using this instead of the APItoolkit HTTP client will not log request and response bodies. To use otel outgoing request monitoring, you must first install it using the command below:
go get go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp
Here's an example of the configuration with otel instrumentation:
package main
import (
"io"
"log"
"net/http"
apitoolkit "github.com/apitoolkit/apitoolkit-go/gin"
"github.com/gin-gonic/gin"
_ "github.com/joho/godotenv/autoload" // autoload .env file for otel configuration
"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
)
var clientWithOtel = http.Client{
Transport: otelhttp.NewTransport(http.DefaultTransport),
}
func main() {
// Configure openTelemetry
shutdown, err := apitoolkit.ConfigureOpenTelemetry()
if err != nil {
log.Printf("error configuring openTelemetry: %v", err)
}
defer shutdown()
router := gin.New()
router.Use(apitoolkit.Middleware(apitoolkit.Config{}))
router.GET("/", func(c *gin.Context) {
// Create a new request
ctx := c.Request.Context()
req, err := http.NewRequestWithContext(ctx, "GET", "https://jsonplaceholder.typicode.com/users", nil)
if err != nil {
log.Fatalf("failed to create request: %v", err)
}
// Perform the request, this requests will be monitored by
resp, err := clientWithOtel.Do(req)
if err != nil {
log.Fatalf("failed to make request: %v", err)
}
defer resp.Body.Close()
// Read response body
body, err := io.ReadAll(resp.Body)
if err != nil {
log.Fatalf("failed to read response: %v", err)
}
c.String(http.StatusOK, string(body))
})
router.Run(":8000")
}
</div> </section>
---
OpenTelemetry Redis Instrumentation
APItoolkit provides an OpenTelemetry Redis instrumentation library that you can use to monitor Redis requests. To use the Redis instrumentation, you must first install it using the command below:
go get github.com/go-redis/redis/extra/redisotel/v8
Here's an example of the configuration with Redis instrumentation:
package main
import (
"log"
"net/http"
apitoolkit "github.com/apitoolkit/apitoolkit-go/gin"
"github.com/gin-gonic/gin"
"github.com/go-redis/redis/extra/redisotel/v8"
"github.com/go-redis/redis/v8"
_ "github.com/joho/godotenv/autoload"
)
func main() {
// Configure openTelemetry
shutdown, err := apitoolkit.ConfigureOpenTelemetry()
if err != nil {
log.Printf("error configuring openTelemetry: %v", err)
}
defer shutdown()
// Create Redis client
rdb := redis.NewClient(&redis.Options{
Addr: "localhost:6379",
})
// Add Redis instrumentation
rdb.AddHook(redisotel.NewTracingHook())
router := gin.Default()
router.Use(apitoolkit.Middleware(apitoolkit.Config{}))
router.GET("/greet/:name", func(c *gin.Context) {
// Get the current context from Gin
ctx := c.Request.Context()
// Perform Redis operations
// IMPORTANT: You must use the context from Gin to perform Redis operations
err := rdb.Set(ctx, "example_key", "example_value", 0).Err()
if err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": "Redis set failed: " + err.Error()})
return
}
val, err := rdb.Get(ctx, "example_key").Result()
if err != nil {
c.JSON(http.StatusInternalServerError, gin.H{"error": "Redis get failed: " + err.Error()})
return
}
c.JSON(http.StatusOK, gin.H{"message": "Hello, " + val + "!"})
})
router.Run(":8000")
}
All redis operations will be monitored by the OpenTelemetry SDK and can be viewed in you APIToolkit log explorer.
All Environment Variables
Set the following environment variables in your application to enable the SDK:
Variable Name | Description | Required | Example |
---|---|---|---|
OTEL_RESOURCE_ATTRIBUTES | APItoolkit project key (at-project-key=<YOUR_API_KEY> ) | Yes | at-project-key=my-api-key |
OTEL_SERVICE_NAME | The name of the service being monitored | No | example-chi-server |
OTEL_SERVICE_VERSION | The version of your application or service | No | 0.0.1 |
OTEL_EXPORTER_OTLP_ENDPOINT | The grpc endpoint for the OpenTelemetry collector. | No | otelcol.apitoolkit.io:4317 |
OTEL_TRACES_ENABLED | Enable or disable tracing | No | true |
OTEL_METRICS_ENABLED | Enable or disable metrics | No | true |
OTEL_LOG_LEVEL | The log level for the SDK (Set to debug to enable debug logs) | No | info |
OTEL_EXPORTER_OTLP_METRICS_PERIOD | The period at which metrics are exported. | No | 30s |
OTEL_PROPAGATORS | The propagators to use for tracing. | No | tracecontext,baggage |
All Middleware Configuration Fields
The middleware configuration specifies how the APItoolkit SDK should handle requests and responses. Below are the available fields:
Field Name | Type | Description | Default Value | Example |
---|---|---|---|---|
Debug | bool | Enable detailed logs during development | false | true |
ServiceName | string | Name of the service being monitored | - | "example-chi-server" |
ServiceVersion | string | Version of the service | - | "0.0.1" |
Tags | []string | Additional tags for contextual information | [] | []string{"env:dev", "team:backend"} |
CaptureRequestBody | bool | Enable capturing of request body | false | true |
CaptureResponseBody | bool | Enable capturing of response body | false | true |
RedactHeaders | []string | List of headers to redact | [] | []string{"Authorization", "X-Api-Key"} |
RedactRequestBody | []string | JSONPath list of request body fields to redact | [] | []string{"$.password", "$.credit_card"} |
RedactResponseBody | []string | JSONPath list of response body fields to redact | [] | []string{"$.password", "$.credit_card"} |
<div class="callout">
<p><i class="fa-regular fa-lightbulb"></i> <b>Tips</b></p>
<ol>
<li>
Remember to keep your APIToolkit project key (at-project-key
) secure and not expose it in public repositories or logs.
</li>
</ul>
</div>