Repository: hetznercloud/hcloud-go
Pull request #185 (2021-08-23 09:40:26)

Make it possible to instrument the hcloud-go
Signed-off-by: Lukas Kämmerling <lukas.kaemmerling@hetzner-cloud.de>


Patch:
diff --git a/go.mod b/go.mod
index 62bb4c9..8bb6c55 100644
--- a/go.mod
+++ b/go.mod
@@ -3,12 +3,22 @@ module github.com/hetznercloud/hcloud-go
 go 1.17
 
 require (
-	github.com/google/go-cmp v0.5.0
+	github.com/google/go-cmp v0.5.5
+	github.com/prometheus/client_golang v1.11.0
 	github.com/stretchr/testify v1.7.0
 )
 
 require (
-	github.com/davecgh/go-spew v1.1.0 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.1 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/golang/protobuf v1.4.3 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/client_model v0.2.0 // indirect
+	github.com/prometheus/common v0.26.0 // indirect
+	github.com/prometheus/procfs v0.6.0 // indirect
+	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect
+	google.golang.org/protobuf v1.26.0-rc.1 // indirect
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
diff --git a/go.sum b/go.sum
index 0a5f85e..cfc3bc2 100644
--- a/go.sum
+++ b/go.sum
@@ -1,15 +1,147 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
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+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
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+github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
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 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/google/go-cmp v0.5.0 h1:/QaMHBdZ26BB3SSst0Iwl10Epc+xhTquomWX0oZEB6w=
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+google.golang.org/protobuf v1.26.0-rc.1 h1:7QnIQpGRHE5RnLKnESfDoxm2dTapTZua5a0kS0A+VXQ=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/hcloud/client.go b/hcloud/client.go
index 8f5bd4e..07db0b7 100644
--- a/hcloud/client.go
+++ b/hcloud/client.go
@@ -15,7 +15,10 @@ import (
 	"strings"
 	"time"
 
+	"github.com/hetznercloud/hcloud-go/hcloud/internal/instrumentation"
+
 	"github.com/hetznercloud/hcloud-go/hcloud/schema"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 // Endpoint is the base URL of the API.
@@ -48,15 +51,16 @@ func ExponentialBackoff(b float64, d time.Duration) BackoffFunc {
 
 // Client is a client for the Hetzner Cloud API.
 type Client struct {
-	endpoint           string
-	token              string
-	pollInterval       time.Duration
-	backoffFunc        BackoffFunc
-	httpClient         *http.Client
-	applicationName    string
-	applicationVersion string
-	userAgent          string
-	debugWriter        io.Writer
+	endpoint                string
+	token                   string
+	pollInterval            time.Duration
+	backoffFunc             BackoffFunc
+	httpClient              *http.Client
+	applicationName         string
+	applicationVersion      string
+	userAgent               string
+	debugWriter             io.Writer
+	instrumentationRegistry *prometheus.Registry
 
 	Action           ActionClient
 	Certificate      CertificateClient
@@ -135,6 +139,13 @@ func WithHTTPClient(httpClient *http.Client) ClientOption {
 	}
 }
 
+// WithInstrumentation configures a Client to collect metrics about the performed HTTP requests.
+func WithInstrumentation(registry *prometheus.Registry) ClientOption {
+	return func(client *Client) {
+		client.instrumentationRegistry = registry
+	}
+}
+
 // NewClient creates a new client.
 func NewClient(options ...ClientOption) *Client {
 	client := &Client{
@@ -149,6 +160,10 @@ func NewClient(options ...ClientOption) *Client {
 	}
 
 	client.buildUserAgent()
+	if client.instrumentationRegistry != nil {
+		i := instrumentation.New("api", client.instrumentationRegistry)
+		client.httpClient.Transport = i.InstrumentedRoundTripper()
+	}
 
 	client.Action = ActionClient{client: client}
 	client.Datacenter = DatacenterClient{client: client}
diff --git a/hcloud/internal/instrumentation/metrics.go b/hcloud/internal/instrumentation/metrics.go
new file mode 100644
index 0000000..d8e9a2e
--- /dev/null
+++ b/hcloud/internal/instrumentation/metrics.go
@@ -0,0 +1,86 @@
+package instrumentation
+
+import (
+	"fmt"
+	"net/http"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+type Instrumenter struct {
+	subsystemIdentifier     string // will be used as part of the metric name (hcloud_<identifier>_requests_total)
+	instrumentationRegistry *prometheus.Registry
+}
+
+// New creates a new Instrumenter. The subsystemIdentifier will be used as part of the metric names (e.g. hcloud_<identifier>_requests_total)
+func New(subsystemIdentifier string, instrumentationRegistry *prometheus.Registry) *Instrumenter {
+	return &Instrumenter{subsystemIdentifier: subsystemIdentifier, instrumentationRegistry: instrumentationRegistry}
+}
+
+// InstrumentedRoundTripper returns an instrumented round tripper.
+func (i *Instrumenter) InstrumentedRoundTripper() http.RoundTripper {
+	inFlightRequestsGauge := prometheus.NewGauge(prometheus.GaugeOpts{
+		Name: fmt.Sprintf("hcloud_%s_in_flight_requests", i.subsystemIdentifier),
+		Help: fmt.Sprintf("A gauge of in-flight requests to the hcloud %s.", i.subsystemIdentifier),
+	})
+
+	requestsPerEndpointCounter := prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: fmt.Sprintf("hcloud_%s_requests_total", i.subsystemIdentifier),
+			Help: fmt.Sprintf("A counter for requests to the hcloud %s per endpoint.", i.subsystemIdentifier),
+		},
+		[]string{"code", "method", "api_endpoint"},
+	)
+
+	requestLatencyHistogram := prometheus.NewHistogramVec(
+		prometheus.HistogramOpts{
+			Name:    fmt.Sprintf("hcloud_%s_request_duration_seconds", i.subsystemIdentifier),
+			Help:    fmt.Sprintf("A histogram of request latencies to the hcloud %s .", i.subsystemIdentifier),
+			Buckets: prometheus.DefBuckets,
+		},
+		[]string{"method"},
+	)
+
+	i.instrumentationRegistry.MustRegister(requestsPerEndpointCounter, requestLatencyHistogram, inFlightRequestsGauge)
+
+	return promhttp.InstrumentRoundTripperInFlight(inFlightRequestsGauge,
+		promhttp.InstrumentRoundTripperDuration(requestLatencyHistogram,
+			i.instrumentRoundTripperEndpoint(requestsPerEndpointCounter,
+				http.DefaultTransport,
+			),
+		),
+	)
+}
+
+// instrumentRoundTripperEndpoint implements a hcloud specific round tripper to count requests per API endpoint
+// numeric IDs are removed from the URI Path.
+// Sample:
+// /volumes/1234/actions/attach --> /volumes/actions/attach
+func (i *Instrumenter) instrumentRoundTripperEndpoint(counter *prometheus.CounterVec, next http.RoundTripper) promhttp.RoundTripperFunc {
+	return func(r *http.Request) (*http.Response, error) {
+		resp, err := next.RoundTrip(r)
+		if err == nil {
+			statusCode := strconv.Itoa(resp.StatusCode)
+			counter.WithLabelValues(statusCode, strings.ToLower(resp.Request.Method), preparePathForLabel(resp.Request.URL.Path)).Inc()
+		}
+		return resp, err
+	}
+}
+
+func preparePathForLabel(path string) string {
+	path = strings.ToLower(path)
+
+	// replace all numbers and chars that are not a-z, / or _
+	reg := regexp.MustCompile("[^a-z/_]+")
+	path = reg.ReplaceAllString(path, "")
+
+	// replace all artifacts of number replacement (//)
+	path = strings.ReplaceAll(path, "//", "/")
+
+	// replace the /v/ that indicated the API version
+	return strings.Replace(path, "/v/", "/", 1)
+}
diff --git a/hcloud/metadata/client.go b/hcloud/metadata/client.go
index 93a9344..c56f1b9 100644
--- a/hcloud/metadata/client.go
+++ b/hcloud/metadata/client.go
@@ -6,6 +6,9 @@ import (
 	"net/http"
 	"strconv"
 	"strings"
+
+	"github.com/hetznercloud/hcloud-go/hcloud/internal/instrumentation"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 const Endpoint = "http://169.254.169.254/hetzner/v1/metadata"
@@ -14,7 +17,8 @@ const Endpoint = "http://169.254.169.254/hetzner/v1/metadata"
 type Client struct {
 	endpoint string
 
-	httpClient *http.Client
+	httpClient              *http.Client
+	instrumentationRegistry *prometheus.Registry
 }
 
 // A ClientOption is used to configure a Client.
@@ -34,6 +38,13 @@ func WithHTTPClient(httpClient *http.Client) ClientOption {
 	}
 }
 
+// WithInstrumentation configures a Client to collect metrics about the performed HTTP requests.
+func WithInstrumentation(registry *prometheus.Registry) ClientOption {
+	return func(client *Client) {
+		client.instrumentationRegistry = registry
+	}
+}
+
 // NewClient creates a new client.
 func NewClient(options ...ClientOption) *Client {
 	client := &Client{
@@ -44,6 +55,11 @@ func NewClient(options ...ClientOption) *Client {
 	for _, option := range options {
 		option(client)
 	}
+
+	if client.instrumentationRegistry != nil {
+		i := instrumentation.New("metadata", client.instrumentationRegistry)
+		client.httpClient.Transport = i.InstrumentedRoundTripper()
+	}
 	return client
 }
 


Test patch:
diff --git a/hcloud/internal/instrumentation/metrics_test.go b/hcloud/internal/instrumentation/metrics_test.go
new file mode 100644
index 0000000..b6144a2
--- /dev/null
+++ b/hcloud/internal/instrumentation/metrics_test.go
@@ -0,0 +1,29 @@
+package instrumentation
+
+import "testing"
+
+func Test_preparePath(t *testing.T) {
+	tests := []struct {
+		name string
+		path string
+		want string
+	}{
+		{
+			"simple test",
+			"/v1/volumes/123456",
+			"/volumes/",
+		},
+		{
+			"simple test",
+			"/v1/volumes/123456/actions/attach",
+			"/volumes/actions/attach",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := preparePathForLabel(tt.path); got != tt.want {
+				t.Errorf("preparePathForLabel() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}