Add service to the recorder

CHANGELOG.md

@@ -2,6 +2,18 @@
 
 ## [Unreleased]
 
+### Breaking changes
+
+- The Recorder methods now receive properties in a single argument, this will make less breaking changes and better API (there where too many arguments for a function).
+
+### Added
+
+- Added new `service` property to identify the service.
+
+### Changed
+
+- The Recorder methods now receive properties in a single argument, this will make less breaking changes and better API (there where too many arguments for a function)
+
 ## [0.5.0] - 2019-12-12
 
 ### Added

Makefile

@@ -2,7 +2,7 @@
 UNIT_TEST_CMD := go test `go list ./... | grep -v vendor` -race -v
 INTEGRATION_TEST_CMD := go test `go list ./... | grep -v vendor`  -race -v -tags='integration'
 BENCHMARK_CMD := go test `go list ./... | grep -v vendor` -benchmem -bench=.
-DEPS_CMD := GO111MODULE=on go mod tidy && GO111MODULE=on go mod vendor
+DEPS_CMD := go mod tidy
 MOCKS_CMD := go generate ./internal/mocks
 
 .PHONY: default

Readme.md

@@ -129,6 +129,10 @@ The factory options are the ones that are passed in the moment of creating the m
 
 This is the implementation of the metrics backend, by default it's a dummy recorder.
 
+#### Service
+
+This is an optional argument that can be used to set a specific service on all the middleware metrics, this is helpful when the service uses multiple middlewares on the same app, for example for the HTTP api server and the metrics server. This also gives the ability to use the same recorder with different middlewares.
+
 #### GroupedStatus
 
 Storing all the status codes could increase the cardinality of the metrics, usually this is not a common case because the used status codes by a service are not too much and are finite, but some services use a lot of different status codes, grouping the status on the `\dxx` form could impact the performance (in a good way) of the queries on Prometheus (as they are already aggregated), on the other hand it losses detail. For example the metrics code `code="401"`, `code="404"`, `code="403"` with this enabled option would end being `code="4xx"` label. By default is disabled.
@@ -163,7 +167,7 @@ DurationBuckets are the buckets used for the request duration histogram metric,
 
 #### SizeBuckets
 
-This works the same as the `DurationBuckets` but for the metric that measures the size of the responses. It's measured in bytes and by default goes form 1B to 1GB.
+This works the same as the `DurationBuckets` but for the metric that measures the size of the responses. It's measured in bytes and by default goes from 1B to 1GB.
 
 #### Registry
 

go.mod

@@ -2,10 +2,10 @@ module github.com/slok/go-http-metrics
 
 require (
 	contrib.go.opencensus.io/exporter/prometheus v0.1.0
-	github.com/emicklei/go-restful v2.9.6+incompatible
+	github.com/emicklei/go-restful v2.11.1+incompatible
 	github.com/gin-gonic/gin v1.5.0
-	github.com/julienschmidt/httprouter v1.2.0
-	github.com/prometheus/client_golang v1.0.0
+	github.com/julienschmidt/httprouter v1.3.0
+	github.com/prometheus/client_golang v1.2.1
 	github.com/stretchr/testify v1.4.0
 	github.com/urfave/negroni v1.0.0
 	go.opencensus.io v0.22.0

go.sum

@@ -3,23 +3,31 @@ contrib.go.opencensus.io/exporter/prometheus v0.1.0 h1:SByaIoWwNgMdPSgl5sMqM2KDE
 contrib.go.opencensus.io/exporter/prometheus v0.1.0/go.mod h1:cGFniUXGZlKRjzOyuZJ6mgB+PgBcCIa79kEKR8YCW+A=
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@@ -45,9 +53,12 @@ github.com/hashicorp/golang-lru v0.5.1 h1:0hERBMJE1eitiLkihrMvRVBYAkpHzc/J3QdDN+
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@@ -64,24 +75,34 @@ github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9
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@@ -115,6 +136,7 @@ golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -127,9 +149,13 @@ golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -146,6 +172,7 @@ google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiq
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metrics/metrics.go

@@ -5,26 +5,47 @@ import (
 	"time"
 )
 
+// HTTPReqProperties are the metric properties for the metrics based
+// on client request.
+type HTTPReqProperties struct {
+	// Service is the service that has served the request.
+	Service string
+	// ID is the id of the request handler.
+	ID string
+	// Method is the method of the request.
+	Method string
+	// Code is the response of the request.
+	Code string
+}
+
+// HTTPProperties are the metric properties for the global server metrics.
+type HTTPProperties struct {
+	// Service is the service that has served the request.
+	Service string
+	// ID is the id of the request handler.
+	ID string
+}
+
 // Recorder knows how to record and measure the metrics. This
 // Interface has the required methods to be used with the HTTP
 // middlewares.
 type Recorder interface {
 	// ObserveHTTPRequestDuration measures the duration of an HTTP request.
-	ObserveHTTPRequestDuration(ctx context.Context, id string, duration time.Duration, method, code string)
+	ObserveHTTPRequestDuration(ctx context.Context, props HTTPReqProperties, duration time.Duration)
 	// ObserveHTTPResponseSize measures the size of an HTTP response in bytes.
-	ObserveHTTPResponseSize(ctx context.Context, id string, sizeBytes int64, method, code string)
+	ObserveHTTPResponseSize(ctx context.Context, props HTTPReqProperties, sizeBytes int64)
 	// AddInflightRequests increments and decrements the number of inflight request being
 	// processed.
-	AddInflightRequests(ctx context.Context, id string, quantity int)
+	AddInflightRequests(ctx context.Context, props HTTPProperties, quantity int)
 }
 
 // Dummy is a dummy recorder.
-var Dummy = &dummy{}
+const Dummy = dummy(0)
 
-type dummy struct{}
+type dummy int
 
-func (dummy) ObserveHTTPRequestDuration(ctx context.Context, id string, duration time.Duration, method, code string) {
-}
-func (dummy) ObserveHTTPResponseSize(ctx context.Context, id string, sizeBytes int64, method, code string) {
-}
-func (dummy) AddInflightRequests(ctx context.Context, id string, quantity int) {}
+func (dummy) ObserveHTTPRequestDuration(_ context.Context, _ HTTPReqProperties, _ time.Duration) {}
+func (dummy) ObserveHTTPResponseSize(_ context.Context, _ HTTPReqProperties, _ int64)            {}
+func (dummy) AddInflightRequests(_ context.Context, _ HTTPProperties, _ int)                     {}
+
+var _ Recorder = Dummy