snapshot of https://github.com/cortezaproject/corteza.git (2024.9.x, 2026-09-18; blobs > 131072B omitted)

server/vendor/github.com/766b/chi-prometheus/.gitignore

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+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/

server/vendor/github.com/766b/chi-prometheus/LICENSE

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+
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server/vendor/github.com/766b/chi-prometheus/README.md

@@ -0,0 +1,69 @@
+# chi-prometheus
+
+[Prometheus](http://prometheus.io) middleware for [chi](https://github.com/go-chi/chi).
+
+This is a port of [negroni-prometheus](https://github.com/zbindenren/negroni-prometheus) middleware (written by [Rene Zbinden](https://github.com/zbindenren)).
+
+## Why
+
+[Logging v. instrumentation](http://peter.bourgon.org/blog/2016/02/07/logging-v-instrumentation.html)
+
+Instead of logging request times, it is considered best practice to provide an endpoint for instrumentation tools (like prometheus).
+
+## Installation
+
+    go get github.com/766b/chi-prometheus
+
+## Usage
+
+Take a look at the [example](./example/main.go).
+
+## What do you get
+
+An endpoint with the following information (stripped output):
+
+    # HELP chi_request_duration_milliseconds How long it took to process the request, partitioned by status code, method and HTTP path.
+    # TYPE chi_request_duration_milliseconds histogram
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="300"} 1
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="1200"} 1
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="5000"} 1
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="serviceName",le="+Inf"} 1
+    chi_request_duration_milliseconds_sum{code="OK",method="GET",path="/metrics",service="serviceName"} 2.003123
+    chi_request_duration_milliseconds_count{code="OK",method="GET",path="/metrics",service="serviceName"} 1
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="300"} 0
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="1200"} 0
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="5000"} 2
+    chi_request_duration_milliseconds_bucket{code="OK",method="GET",path="/ok",service="serviceName",le="+Inf"} 2
+    chi_request_duration_milliseconds_sum{code="OK",method="GET",path="/ok",service="serviceName"} 4747.529026
+    chi_request_duration_milliseconds_count{code="OK",method="GET",path="/ok",service="serviceName"} 2
+    # HELP chi_requests_total How many HTTP requests processed, partitioned by status code, method and HTTP path.
+    # TYPE chi_requests_total counter
+    chi_requests_total{code="OK",method="GET",path="/metrics",service="serviceName"} 1
+    chi_requests_total{code="OK",method="GET",path="/ok",service="serviceName"} 2
+
+## Pattern Middleware Usage
+
+Take a look at the [example](./pattern_example/main.go).
+
+## What do you get 
+
+An endpoint with the following information (stripped output):
+
+    # HELP chi_pattern_request_duration_milliseconds How long it took to process the request, partitioned by status code, method and HTTP path (with patterns).
+    # TYPE chi_pattern_request_duration_milliseconds histogram
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="300"} 1
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="1200"} 1
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="5000"} 1
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/metrics",service="test_service",le="+Inf"} 1
+    chi_pattern_request_duration_milliseconds_sum{code="OK",method="GET",path="/metrics",service="test_service"} 0.975926
+    chi_pattern_request_duration_milliseconds_count{code="OK",method="GET",path="/metrics",service="test_service"} 1
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="300"} 0
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="1200"} 0
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="5000"} 2
+    chi_pattern_request_duration_milliseconds_bucket{code="OK",method="GET",path="/users/{firstName}",service="test_service",le="+Inf"} 2
+    chi_pattern_request_duration_milliseconds_sum{code="OK",method="GET",path="/users/{firstName}",service="test_service"} 4755.052755
+    chi_pattern_request_duration_milliseconds_count{code="OK",method="GET",path="/users/{firstName}",service="test_service"} 2
+    # HELP chi_pattern_requests_total How many HTTP requests processed, partitioned by status code, method and HTTP path (with patterns).
+    # TYPE chi_pattern_requests_total counter
+    chi_pattern_requests_total{code="OK",method="GET",path="/metrics",service="test_service"} 1
+    chi_pattern_requests_total{code="OK",method="GET",path="/users/{firstName}",service="test_service"} 2

server/vendor/github.com/766b/chi-prometheus/middleware.go

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+// Port https://github.com/zbindenren/negroni-prometheus for chi router
+package chiprometheus
+
+import (
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+var (
+	dflBuckets = []float64{300, 1200, 5000}
+)
+
+const (
+	reqsName           = "chi_requests_total"
+	latencyName        = "chi_request_duration_milliseconds"
+	patternReqsName    = "chi_pattern_requests_total"
+	patternLatencyName = "chi_pattern_request_duration_milliseconds"
+)
+
+// Middleware is a handler that exposes prometheus metrics for the number of requests,
+// the latency and the response size, partitioned by status code, method and HTTP path.
+type Middleware struct {
+	reqs    *prometheus.CounterVec
+	latency *prometheus.HistogramVec
+}
+
+// NewMiddleware returns a new prometheus Middleware handler.
+func NewMiddleware(name string, buckets ...float64) func(next http.Handler) http.Handler {
+	var m Middleware
+	m.reqs = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name:        reqsName,
+			Help:        "How many HTTP requests processed, partitioned by status code, method and HTTP path.",
+			ConstLabels: prometheus.Labels{"service": name},
+		},
+		[]string{"code", "method", "path"},
+	)
+	prometheus.MustRegister(m.reqs)
+
+	if len(buckets) == 0 {
+		buckets = dflBuckets
+	}
+	m.latency = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Name:        latencyName,
+		Help:        "How long it took to process the request, partitioned by status code, method and HTTP path.",
+		ConstLabels: prometheus.Labels{"service": name},
+		Buckets:     buckets,
+	},
+		[]string{"code", "method", "path"},
+	)
+	prometheus.MustRegister(m.latency)
+	return m.handler
+}
+
+func (c Middleware) handler(next http.Handler) http.Handler {
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
+		next.ServeHTTP(ww, r)
+		c.reqs.WithLabelValues(http.StatusText(ww.Status()), r.Method, r.URL.Path).Inc()
+		c.latency.WithLabelValues(http.StatusText(ww.Status()), r.Method, r.URL.Path).Observe(float64(time.Since(start).Nanoseconds()) / 1000000)
+	}
+	return http.HandlerFunc(fn)
+}
+
+// NewPatternMiddleware returns a new prometheus Middleware handler that groups requests by the chi routing pattern.
+// EX: /users/{firstName} instead of /users/bob
+func NewPatternMiddleware(name string, buckets ...float64) func(next http.Handler) http.Handler {
+	var m Middleware
+	m.reqs = prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name:        patternReqsName,
+			Help:        "How many HTTP requests processed, partitioned by status code, method and HTTP path (with patterns).",
+			ConstLabels: prometheus.Labels{"service": name},
+		},
+		[]string{"code", "method", "path"},
+	)
+	prometheus.MustRegister(m.reqs)
+
+	if len(buckets) == 0 {
+		buckets = dflBuckets
+	}
+	m.latency = prometheus.NewHistogramVec(prometheus.HistogramOpts{
+		Name:        patternLatencyName,
+		Help:        "How long it took to process the request, partitioned by status code, method and HTTP path (with patterns).",
+		ConstLabels: prometheus.Labels{"service": name},
+		Buckets:     buckets,
+	},
+		[]string{"code", "method", "path"},
+	)
+	prometheus.MustRegister(m.latency)
+	return m.patternHandler
+}
+
+func (c Middleware) patternHandler(next http.Handler) http.Handler {
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		start := time.Now()
+		ww := middleware.NewWrapResponseWriter(w, r.ProtoMajor)
+		next.ServeHTTP(ww, r)
+
+		rctx := chi.RouteContext(r.Context())
+		routePattern := strings.Join(rctx.RoutePatterns, "")
+		routePattern = strings.Replace(routePattern, "/*/", "/", -1)
+
+		c.reqs.WithLabelValues(http.StatusText(ww.Status()), r.Method, routePattern).Inc()
+		c.latency.WithLabelValues(http.StatusText(ww.Status()), r.Method, routePattern).Observe(float64(time.Since(start).Nanoseconds()) / 1000000)
+	}
+	return http.HandlerFunc(fn)
+}