responselogger
Server middleware to log HTTP server response status codes and their times.
Usage
package main
import (
"fmt"
"net/http"
"github.com/welldigital/responselogger"
)
func main() {
// Create a mux to store routes.
mux := http.NewServeMux()
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("Hello world!"))
})
mux.HandleFunc("/other", func(w http.ResponseWriter, r *http.Request) {
http.NotFound(w, r)
})
// Wrap the mux inside the responselogger.
loggedHandler := responselogger.NewHandler(mux)
// Start serving.
fmt.Println("Listening on :1234...")
http.ListenAndServe(":1234", loggedHandler)
fmt.Println("Exited")
}Output
Example output from JSON logging
{"time":"2018-02-01T18:41:31Z","src":"rl","status":404,"http_4xx":1,"len":19,"ms":2,"path":"/other"}
{"time":"2018-02-01T18:41:39Z","src":"rl","status":200,"http_2xx":1,"len":12,"ms":4,"path":"/"}Configuring AWS CloudWatch metrics extraction with Terraform
The JSON logs can be converted into CloudWatch metrics for monitoring with the following Terraform configuration.
resource "aws_cloudwatch_log_metric_filter" "http_2xx" {
name = "HTTP 2xx status"
pattern = "{ ($.src = \"rl\") && ($.http_2xx = *) }"
log_group_name = "logs"
metric_transformation {
name = "http_2xx"
namespace = "HTTPMetrics"
value = "$.http_2xx"
}
}
resource "aws_cloudwatch_log_metric_filter" "http_3xx" {
name = "HTTP 3xx status"
pattern = "{ ($.src = \"rl\") && ($.http_3xx = *) }"
log_group_name = "logs"
metric_transformation {
name = "http_3xx"
namespace = "HTTPMetrics"
value = "$.http_3xx"
}
}
resource "aws_cloudwatch_log_metric_filter" "http_4xx" {
name = "HTTP 4xx status"
pattern = "{ ($.src = \"rl\") && ($.http_4xx = *) }"
log_group_name = "logs"
metric_transformation {
name = "http_4xx"
namespace = "HTTPMetrics"
value = "$.http_4xx"
}
}
resource "aws_cloudwatch_log_metric_filter" "http_5xx" {
name = "HTTP 5xx status"
pattern = "{ ($.src = \"rl\") && ($.http_5xx = *) }"
log_group_name = "logs"
metric_transformation {
name = "http_5xx"
namespace = "HTTPMetrics"
value = "$.http_5xx"
}
}
resource "aws_cloudwatch_log_metric_filter" "http_duration_ms" {
name = "HTTP duration ms"
pattern = "{ ($.src = \"rl\") && ($.ms = *) }"
log_group_name = "logs"
metric_transformation {
name = "http_duration_ms"
namespace = "HTTPMetrics"
value = "$.ms"
}
}
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