/
proxy.go
103 lines (89 loc) · 2.25 KB
/
proxy.go
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package server
import (
"io/ioutil"
"net/http"
"strings"
yaml "gopkg.in/yaml.v2"
"github.com/gorilla/mux"
log "github.com/sirupsen/logrus"
)
const (
SwaggerPath = "/swagger/swagger.yaml"
)
type RestSwagger struct {
Paths map[string]interface{} `yaml:"paths"`
}
func registerProxyHandlerLegacy(prefix, lcd string, router *mux.Router) error {
paths, err := getRestPaths(lcd)
if err != nil {
log.WithError(err).Fatal("get rest paths failed")
return err
}
for _, path := range paths {
if strings.HasPrefix(path, "/txs/") ||
strings.HasPrefix(path, "/blocks/") ||
strings.HasPrefix(path, "/validatorsets/") {
router.HandleFunc(prefix+path, httpProxy(lcd, prefix))
}
}
return nil
}
func registerProxyHandler(lcd string, router *mux.Router) error {
paths, err := getRestPaths(lcd)
if err != nil {
log.WithError(err).Fatal("get rest paths failed")
return err
}
for _, path := range paths {
router.HandleFunc(path, httpProxy(lcd, ""))
}
return nil
}
func getRestPaths(lcd string) ([]string, error) {
url := lcd + SwaggerPath
resp, err := http.Get(url)
if err != nil {
return nil, err
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
restSwagger := &RestSwagger{}
if err = yaml.Unmarshal(body, restSwagger); err != nil {
return nil, err
}
paths := make([]string, 0, len(restSwagger.Paths))
for path := range restSwagger.Paths {
paths = append(paths, path)
}
return paths, nil
}
func httpProxy(lcd, prefix string) http.HandlerFunc {
return func(writer http.ResponseWriter, request *http.Request) {
client := &http.Client{}
path := strings.TrimPrefix(request.URL.Path, prefix)
req, err := http.NewRequest("GET", lcd+path, nil)
if err != nil {
log.WithError(err).Error("http new request error")
return
}
resp, err := client.Do(req)
if err != nil {
log.WithError(err).Error("http client do failed")
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
log.WithError(err).Error("read response body failed")
return
}
writer.Header().Set("Content-Type", resp.Header.Get("Content-Type"))
if _, err = writer.Write(body); err != nil {
log.WithError(err).Error("write response failed")
return
}
}
}