49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package middleware
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import (
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"fmt"
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"net/http"
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"github.com/justinas/alice"
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)
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func NewHealthCheck(paths, userAgents []string) alice.Constructor {
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return func(next http.Handler) http.Handler {
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return healthCheck(paths, userAgents, next)
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}
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}
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func healthCheck(paths, userAgents []string, next http.Handler) http.Handler {
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// Use a map as a set to check health check paths
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pathSet := make(map[string]struct{})
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for _, path := range paths {
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pathSet[path] = struct{}{}
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}
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// Use a map as a set to check health check paths
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userAgentSet := make(map[string]struct{})
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for _, userAgent := range userAgents {
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userAgentSet[userAgent] = struct{}{}
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}
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return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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if isHealthCheckRequest(pathSet, userAgentSet, req) {
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rw.WriteHeader(http.StatusOK)
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fmt.Fprintf(rw, "OK")
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return
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}
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next.ServeHTTP(rw, req)
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})
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}
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func isHealthCheckRequest(paths, userAgents map[string]struct{}, req *http.Request) bool {
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if _, ok := paths[req.URL.EscapedPath()]; ok {
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return true
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}
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if _, ok := userAgents[req.Header.Get("User-Agent")]; ok {
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return true
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}
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return false
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}
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