98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package agent
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import (
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"encoding/json"
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"fmt"
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"net/http"
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"time"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"go-common/library/log"
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)
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// HTTPServer provides an HTTP api for an agent.
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type HTTPServer struct {
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*http.Server
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agent *Agent
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// proto is filled by the agent to "http" or "https".
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proto string
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}
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// NewHTTPServer http server provide simple query api
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func NewHTTPServer(addr string, a *Agent) *HTTPServer {
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s := &HTTPServer{
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Server: &http.Server{Addr: addr},
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agent: a,
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}
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s.Server.Handler = s.handler()
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return s
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}
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// handler is used to attach our handlers to the mux
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func (s *HTTPServer) handler() http.Handler {
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mux := http.NewServeMux()
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// TODO: simple manage ui
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// API V1
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mux.HandleFunc("/v1/naming/", s.wrap(s.NSTranslation)) // naming path
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mux.Handle("/metrics", promhttp.Handler())
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return mux
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}
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// wrap is used to wrap functions to make them more convenient
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func (s *HTTPServer) wrap(handler func(resp http.ResponseWriter, req *http.Request) (interface{}, error)) http.HandlerFunc {
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return func(resp http.ResponseWriter, req *http.Request) {
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logURL := req.URL.String()
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handleErr := func(err error) {
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log.Error("http: Request %s %v from %s, err: %v\n", req.Method, logURL, req.RemoteAddr, err)
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resp.WriteHeader(http.StatusInternalServerError)
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fmt.Fprint(resp, err.Error())
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}
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// Invoke the handler
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start := time.Now()
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defer func() {
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log.V(5).Info("http: Request %s %v from %s, Timing: %v\n", req.Method, logURL, req.RemoteAddr, time.Since(start))
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}()
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obj, err := handler(resp, req)
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if err != nil {
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handleErr(err)
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return
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}
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if obj == nil {
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return
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}
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buf, err := s.marshalJSON(req, obj)
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if err != nil {
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handleErr(err)
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return
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}
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resp.Header().Set("Content-Type", "application/json")
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resp.Write(buf)
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}
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}
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// marshalJSON marshals the object into JSON, respecting the user's pretty-ness
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// configuration.
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func (s *HTTPServer) marshalJSON(req *http.Request, obj interface{}) ([]byte, error) {
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if _, ok := req.URL.Query()["pretty"]; ok {
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buf, err := json.MarshalIndent(obj, "", " ")
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if err != nil {
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return nil, err
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}
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buf = append(buf, "\n"...)
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return buf, nil
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}
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buf, err := json.Marshal(obj)
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if err != nil {
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return nil, err
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}
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return buf, err
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}
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