95 lines
2.2 KiB
Go
95 lines
2.2 KiB
Go
package otelginmetrics
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import (
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"net/http"
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"time"
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"github.com/gin-gonic/gin"
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semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
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)
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// Middleware returns middleware that will trace incoming requests.
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// The service parameter should describe the name of the (virtual)
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// server handling the request.
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func Middleware(service string, options ...Option) gin.HandlerFunc {
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cfg := defaultConfig()
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for _, option := range options {
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option.apply(cfg)
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}
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recorder := cfg.recorder
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if recorder == nil {
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recorder = GetRecorder("")
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}
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return func(ginCtx *gin.Context) {
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ctx := ginCtx.Request.Context()
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route := ginCtx.FullPath()
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if len(route) <= 0 {
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route = "nonconfigured"
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}
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if !cfg.shouldRecord(service, route, ginCtx.Request) {
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ginCtx.Next()
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return
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}
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start := time.Now()
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reqAttributes := cfg.attributes(service, route, ginCtx.Request)
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if cfg.recordInFlight {
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recorder.AddInflightRequests(ctx, 1, reqAttributes)
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defer recorder.AddInflightRequests(ctx, -1, reqAttributes)
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}
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defer func() {
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resAttributes := append(reqAttributes[0:0], reqAttributes...)
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if cfg.groupedStatus {
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code := int(ginCtx.Writer.Status()/100) * 100
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resAttributes = append(resAttributes, semconv.HTTPStatusCodeKey.Int(code))
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} else {
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resAttributes = append(resAttributes, semconv.HTTPAttributesFromHTTPStatusCode(ginCtx.Writer.Status())...)
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}
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recorder.AddRequests(ctx, 1, resAttributes)
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if cfg.recordSize {
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requestSize := computeApproximateRequestSize(ginCtx.Request)
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recorder.ObserveHTTPRequestSize(ctx, requestSize, resAttributes)
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recorder.ObserveHTTPResponseSize(ctx, int64(ginCtx.Writer.Size()), resAttributes)
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}
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if cfg.recordDuration {
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recorder.ObserveHTTPRequestDuration(ctx, time.Since(start), resAttributes)
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}
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}()
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ginCtx.Next()
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}
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}
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func computeApproximateRequestSize(r *http.Request) int64 {
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s := 0
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if r.URL != nil {
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s = len(r.URL.Path)
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}
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s += len(r.Method)
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s += len(r.Proto)
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for name, values := range r.Header {
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s += len(name)
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for _, value := range values {
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s += len(value)
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}
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}
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s += len(r.Host)
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// N.B. r.Form and r.MultipartForm are assumed to be included in r.URL.
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if r.ContentLength != -1 {
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s += int(r.ContentLength)
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}
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return int64(s)
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}
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