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-rw-r--r--internal/metrics/metrics.go39
-rw-r--r--internal/metrics/metrics_test.go28
2 files changed, 67 insertions, 0 deletions
diff --git a/internal/metrics/metrics.go b/internal/metrics/metrics.go
new file mode 100644
index 0000000..7ae09b6
--- /dev/null
+++ b/internal/metrics/metrics.go
@@ -0,0 +1,39 @@
+package metrics
+
+import (
+ "net/http"
+ "strconv"
+)
+
+func SanitizeCode(s int) string {
+ switch s {
+ case 0, 200:
+ return "200"
+ default:
+ return strconv.Itoa(s)
+ }
+}
+
+// Only support the list of "regular" HTTP methods, see
+// https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods
+var methodMap = map[string]string{
+ "GET": http.MethodGet, "get": http.MethodGet,
+ "HEAD": http.MethodHead, "head": http.MethodHead,
+ "PUT": http.MethodPut, "put": http.MethodPut,
+ "POST": http.MethodPost, "post": http.MethodPost,
+ "DELETE": http.MethodDelete, "delete": http.MethodDelete,
+ "CONNECT": http.MethodConnect, "connect": http.MethodConnect,
+ "OPTIONS": http.MethodOptions, "options": http.MethodOptions,
+ "TRACE": http.MethodTrace, "trace": http.MethodTrace,
+ "PATCH": http.MethodPatch, "patch": http.MethodPatch,
+}
+
+// SanitizeMethod sanitizes the method for use as a metric label. This helps
+// prevent high cardinality on the method label. The name is always upper case.
+func SanitizeMethod(m string) string {
+ if m, ok := methodMap[m]; ok {
+ return m
+ }
+
+ return "OTHER"
+}
diff --git a/internal/metrics/metrics_test.go b/internal/metrics/metrics_test.go
new file mode 100644
index 0000000..c3f5965
--- /dev/null
+++ b/internal/metrics/metrics_test.go
@@ -0,0 +1,28 @@
+package metrics
+
+import (
+ "strings"
+ "testing"
+)
+
+func TestSanitizeMethod(t *testing.T) {
+ tests := []struct {
+ method string
+ expected string
+ }{
+ {method: "get", expected: "GET"},
+ {method: "POST", expected: "POST"},
+ {method: "OPTIONS", expected: "OPTIONS"},
+ {method: "connect", expected: "CONNECT"},
+ {method: "trace", expected: "TRACE"},
+ {method: "UNKNOWN", expected: "OTHER"},
+ {method: strings.Repeat("ohno", 9999), expected: "OTHER"},
+ }
+
+ for _, d := range tests {
+ actual := SanitizeMethod(d.method)
+ if actual != d.expected {
+ t.Errorf("Not same: expected %#v, but got %#v", d.expected, actual)
+ }
+ }
+}