/
proxy.go
196 lines (165 loc) · 4.56 KB
/
proxy.go
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package main
import (
"context"
"errors"
"fmt"
"io"
"log/slog"
"net/http"
"net/url"
"strings"
"github.com/gurleensethi/tiny-proxy/middleware"
)
func New(c *ProxyConfig, infoLog *slog.Logger, errorLog *slog.Logger) *Proxy {
return &Proxy{
config: c,
infoLog: infoLog,
errorLog: errorLog,
}
}
type Proxy struct {
config *ProxyConfig
infoLog *slog.Logger
errorLog *slog.Logger
}
func (p *Proxy) Start(ctx context.Context) error {
for _, s := range p.config.Servers {
server := s
mux := http.NewServeMux()
routeMatcher := NewRegexRouteMatcher()
err := routeMatcher.LoadRoutes(server.Http.Routes...)
if err != nil {
return err
}
middlewares := middleware.Middlewares{}
if server.Http != nil {
for _, m := range server.Http.Middlewares {
m, err := middleware.LoadMiddleware(m.Name, p.infoLog, p.errorLog, m.Options)
if err != nil {
return err
}
middlewares = append(middlewares, m)
}
}
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
err := middlewares.ExecuteRequestReceived(middleware.RequestReceivedOptions{
Request: r,
Writer: w,
})
if err != nil {
p.errorLog.Error("failed to execute request received middleware",
slog.Any("error", err),
)
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
matchResult, err := routeMatcher.Match(r)
if err != nil {
p.errorLog.Error("failed to match route", slog.Any("error", err))
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
if matchResult == nil {
w.Header().Set("X-Response-From", "tiny-proxy")
http.Error(w, "404 page not found", http.StatusNotFound)
return
}
backendURL, _ := url.Parse(matchResult.Route.Backend.URL)
backendURL.Path = r.URL.Path
backendURL.RawQuery = r.URL.RawQuery
// Replace all the placeholders in the rewrite path
if matchResult.Route.Rewrite != nil {
backendURL.Path = *matchResult.Route.Rewrite
for k, v := range matchResult.Match {
backendURL.Path = strings.ReplaceAll(backendURL.Path, k, v)
}
}
proxyRequest := &http.Request{
Method: r.Method,
URL: backendURL,
Body: r.Body,
Header: r.Header,
ContentLength: r.ContentLength,
Form: r.Form,
PostForm: r.PostForm,
MultipartForm: r.MultipartForm,
Trailer: r.Trailer,
RemoteAddr: r.RemoteAddr,
TLS: r.TLS,
}
middlewares.ExecutePreProxyRequest(middleware.PreProxyRequestOptions{
Request: r,
Writer: w,
ProxyRequest: proxyRequest,
})
resp, err := http.DefaultClient.Do(proxyRequest)
if err != nil {
p.errorLog.Error("failed to proxy request",
slog.String("path", r.URL.Path),
slog.String("method", r.Method),
slog.String("host", r.Host),
slog.String("scheme", r.URL.Scheme),
slog.Any("error", err),
)
w.WriteHeader(http.StatusInternalServerError)
return
}
for key, values := range resp.Header {
for _, v := range values {
w.Header().Set(key, v)
}
}
err = middlewares.ExecutePreResponse(middleware.PreResponseOptions{
Request: r,
Writer: w,
})
if err != nil {
p.errorLog.Error("failed to execute pre response middleware", slog.Any("error", err))
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.WriteHeader(resp.StatusCode)
buffer := make([]byte, 4*1024)
for {
n, err := resp.Body.Read(buffer)
w.Write(buffer[:n])
if err == io.EOF {
break
} else if err != nil {
p.errorLog.Error("failed to read response body",
slog.Any("error", err),
)
w.WriteHeader(http.StatusInternalServerError)
return
}
}
err = resp.Body.Close()
if err != nil {
p.errorLog.Error("failed to close response body",
slog.Any("error", err),
)
}
err = middlewares.ExecutePostResponse(middleware.PostResponseOptions{
Request: r,
Writer: w,
})
if err != nil {
p.errorLog.Error("failed to execute pre response middleware", slog.Any("error", err))
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
})
if server.Http != nil {
var handler http.Handler = mux
p.infoLog.Info("starting http server...",
slog.String("host", server.Http.Host),
slog.Int("port", server.Http.Port))
return http.ListenAndServe(
// TODO: start http server only if http config is not nil
fmt.Sprintf("%s:%d", server.Http.Host, server.Http.Port),
handler,
)
}
}
return errors.New("no server config found")
}