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api_server_handler.go
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api_server_handler.go
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package proxy
import (
"bytes"
"encoding/base64"
"fmt"
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httputil"
"net/url"
"regexp"
"strings"
"sync"
"time"
)
func (apiServer *APIServer) newHandler(api *apiStruct) func(http.ResponseWriter, *http.Request) {
bindPath := api.Path
log.Println(apiServer.ServerVhostConf.Port, api.Name, "bind path [", bindPath, "]")
return func(rw http.ResponseWriter, req *http.Request) {
id := api.pvInc()
uniqID := apiServer.uniqReqID(id)
var broadData *BroadCastData
needBroad := apiServer.needBroadcast(api)
start := time.Now()
if needBroad {
broadData = apiServer.initBroadCastData(req)
broadData.ID = uniqID
defer func() {
used := float64(time.Now().Sub(start).Nanoseconds()) / 1e6
broadData.setData("used", used)
go apiServer.broadcastAPIReq(api, broadData)
}()
}
rw.Header().Set("Api-Front-Version", APIFrontVersion)
log.Println("[access]", req.URL.String())
relPath := req.URL.Path[len(bindPath):]
req.Header.Set("Connection", "close")
//add this flag,so the real backend can catch it
req.Header.Add("Via", fmt.Sprintf("api-front/%s", APIFrontVersion))
logData := make(map[string]interface{})
var logRw sync.RWMutex
body, err := ioutil.ReadAll(req.Body)
logData["body_len"] = len(body)
if err != nil {
rw.WriteHeader(http.StatusBadGateway)
rw.Write([]byte("read body failed"))
if needBroad {
broadData.setError(err.Error())
}
return
}
//get body must by before parse callerPref
hosts, masterHost, cpf := api.getAPIHostsByReq(req)
if needBroad {
broadData.setData("master", masterHost)
broadData.setData("remote", cpf.GetIP())
}
_uri := req.URL.Path
if req.URL.RawQuery != "" {
_uri += "?" + req.URL.RawQuery
}
mainLogStr := fmt.Sprintf("uniqid=%s port=%d remote=%s method=%s uri=%s master=%s hostsTotal=%d refer=%s", uniqID, apiServer.ServerVhostConf.Port, req.RemoteAddr, req.Method, _uri, masterHost, len(hosts), req.Referer())
var printLog = func(logIndex int) {
logRw.RLock()
defer logRw.RUnlock()
totalUsed := fmt.Sprintf("%.3fms", float64(time.Now().Sub(start).Nanoseconds())/1e6)
log.Println(fmt.Sprintf("[access]logindex=%d/%d", logIndex, len(hosts)), mainLogStr, fmt.Sprintf("totalUsed=%s", totalUsed), logData)
}
defer (func() {
printLog(1)
})()
rw.Header().Set("Api-Front-Master", masterHost)
addrInfo := strings.Split(req.RemoteAddr, ":")
if len(hosts) == 0 {
logData["hostTotal"] = 0
rw.WriteHeader(http.StatusBadGateway)
rw.Write([]byte("no backend hosts"))
if needBroad {
broadData.setError("no backend hosts")
}
return
}
bodyLen := int64(len(body))
var reqs []*apiHostRequest
//build request
for _, apiHost := range hosts {
isMaster := apiHost.Name == masterHost
urlNew := ""
serverURL := apiHost.URLStr
if api.HostAsProxy {
serverURL = "http://" + req.Host + api.Path
}
if strings.HasSuffix(urlNew, "/") {
urlNew += strings.TrimLeft(relPath, "/")
} else {
urlNew += relPath
}
if req.URL.RawQuery != "" {
urlNew += "?" + req.URL.RawQuery
}
rawURL := apiHost.URLStr + urlNew
if isMaster {
rw.Header().Set("Api-Front-Raw-Url", rawURL)
}
urlNew = serverURL + urlNew
if needBroad {
broadData.setData("raw_url", rawURL)
}
reqNew, err := http.NewRequest(req.Method, urlNew, ioutil.NopCloser(bytes.NewReader(body)))
if err != nil {
log.Println("[error]build req failed:", err)
if isMaster {
rw.WriteHeader(http.StatusBadGateway)
rw.Write([]byte("error:" + err.Error() + "\nraw_url:" + rawURL))
}
if needBroad {
broadData.setError(err.Error())
}
return
}
copyHeaders(reqNew.Header, req.Header)
//only accept gzip encode
acceptEncoding := reqNew.Header.Get("Accept-Encoding")
if acceptEncoding != "" && (InStringSlice("gzip", reqNew.Header["Accept-Encoding"]) || strings.Contains(acceptEncoding, "gzip")) {
reqNew.Header.Set("Accept-Encoding", "gzip")
}
if bodyLen > 0 {
reqNew.ContentLength = bodyLen
reqNew.Header.Set("Content-Length", fmt.Sprintf("%d", bodyLen))
}
if req.Header.Get("HTTP_X_FORWARDED_FOR") != "" {
reqNew.Header.Set("HTTP_X_FORWARDED_FOR", addrInfo[0])
}
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: time.Duration(api.TimeoutMs) * time.Millisecond,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
}
if api.HostAsProxy {
transport.Proxy = (func(u string) func(*http.Request) (*url.URL, error) {
return func(req *http.Request) (*url.URL, error) {
return url.Parse(u)
}
})(apiHost.URLStr)
}
if api.proxyURL != nil {
transport.Proxy = func(req *http.Request) (*url.URL, error) {
return api.proxyURL, nil
}
}
apiReq := &apiHostRequest{
req: reqNew,
transport: transport,
apiHost: apiHost,
isMaster: isMaster,
urlNew: urlNew,
urlRaw: rawURL,
}
reqs = append(reqs, apiReq)
}
//call master at first sync
for index, apiReq := range reqs {
if !apiReq.isMaster {
continue
}
backLog := make(map[string]interface{})
defer (func() {
logRw.Lock()
logData[fmt.Sprintf("host_%s_%d", apiReq.apiHost.Name, index)] = backLog
logRw.Unlock()
})()
hostStart := time.Now()
backLog["isMaster"] = apiReq.isMaster
backLog["start"] = fmt.Sprintf("%.4f", float64(hostStart.UnixNano())/1e9)
resp, err := apiReq.transport.RoundTrip(apiReq.req)
if err != nil {
log.Println("[error]call_master_sync "+apiReq.urlNew, err)
rw.WriteHeader(http.StatusBadGateway)
rw.Write([]byte("fetch_error:" + err.Error() + "\nraw_url:" + apiReq.urlRaw + "\nnew_url:" + apiReq.urlNew))
if needBroad {
broadData.setError(err.Error())
}
return
}
defer resp.Body.Close()
if needBroad {
apiServer.addBroadCastDataResponse(broadData, resp)
}
for k, vs := range resp.Header {
for _, v := range vs {
rw.Header().Add(k, v)
}
}
rw.Header().Set("Connection", "close")
rw.WriteHeader(resp.StatusCode)
backLog["status"] = resp.StatusCode
n, err := io.Copy(rw, resp.Body)
if err != nil {
log.Println(apiReq.urlNew, "io.copy:", n, err)
}
hostEnd := time.Now()
used := hostEnd.Sub(hostStart)
backLog["end"] = fmt.Sprintf("%.4f", float64(hostEnd.UnixNano())/1e9)
backLog["used"] = fmt.Sprintf("%.3fms", float64(used.Nanoseconds())/1e6)
}
if len(reqs) > 1 {
//call other hosts async
go (func(reqs []*apiHostRequest) {
defer (func() {
printLog(len(reqs))
})()
var wgOther sync.WaitGroup
for index, apiReq := range reqs {
if apiReq.isMaster {
continue
}
wgOther.Add(1)
go (func(index int, apiReq *apiHostRequest) {
backLog := make(map[string]interface{})
defer (func() {
logRw.Lock()
logData[fmt.Sprintf("host_%s_%d", apiReq.apiHost.Name, index)] = backLog
logRw.Unlock()
wgOther.Done()
})()
hostStart := time.Now()
backLog["isMaster"] = apiReq.isMaster
backLog["start"] = fmt.Sprintf("%.4f", float64(hostStart.UnixNano())/1e9)
backLog["isMaster"] = apiReq.isMaster
resp, err := apiReq.transport.RoundTrip(apiReq.req)
if err != nil {
log.Println("[error]call_other_async,fetch "+apiReq.urlNew, err)
return
}
backLog["status"] = resp.StatusCode
defer resp.Body.Close()
hostEnd := time.Now()
used := hostEnd.Sub(hostStart)
backLog["end"] = fmt.Sprintf("%.4f", float64(hostEnd.UnixNano())/1e9)
backLog["used"] = fmt.Sprintf("%.3fms", float64(used.Nanoseconds())/1e6)
})(index, apiReq)
}
wgOther.Wait()
})(reqs)
}
}
}
type apiHostRequest struct {
req *http.Request
urlRaw string
urlNew string
transport *http.Transport
apiHost *Host
isMaster bool
}
var reqCookieDumpLine = regexp.MustCompile(`Cookie: .+\r\n`)
func (apiServer *APIServer) initBroadCastData(req *http.Request) *BroadCastData {
data := newReqBroadCastData(req)
dumpBody := IsRequestDumpBody(req)
dump, _ := httputil.DumpRequest(req, dumpBody)
reqDetail := string(dump)
if apiServer.ServerVhostConf.HiddenCookie {
reqDetail = reqCookieDumpLine.ReplaceAllStringFunc(reqDetail, ReqCookieHidden)
}
data.setData("req_detail", base64.StdEncoding.EncodeToString([]byte(reqDetail)))
return data
}
var resCookieDumpLine = regexp.MustCompile(`Set-Cookie: .+\r\n`)
func (apiServer *APIServer) addBroadCastDataResponse(broadData *BroadCastData, resp *http.Response) {
dumpBody := true
ct := resp.Header.Get("Content-Type")
broadData.setData("content-type", ct)
if resp.StatusCode == http.StatusOK {
dumpBody = IsContentTypeText(ct) || strings.HasPrefix(ct, "image/")
//内容太长的也不广播
if dumpBody && resp.ContentLength > 0 && resp.ContentLength > 1e6 {
dumpBody = false
}
}
switch resp.StatusCode {
case http.StatusBadRequest:
case http.StatusNotFound:
case http.StatusSeeOther:
case http.StatusForbidden:
case http.StatusGone:
case http.StatusBadGateway:
case http.StatusInternalServerError:
case http.StatusServiceUnavailable:
case http.StatusGatewayTimeout:
dumpBody = true
break
default:
break
}
broadData.setData("resp_status", resp.StatusCode)
dump, _ := httputil.DumpResponse(resp, false)
resDetail := string(dump)
if apiServer.ServerVhostConf.HiddenCookie {
resDetail = resCookieDumpLine.ReplaceAllStringFunc(resDetail, ResCookieSetHidden)
}
if !dumpBody {
resDetail += "---body skipped---"
} else {
bd := forgetRead(&resp.Body)
if resp.Header.Get("Content-Encoding") == "gzip" {
resDetail += gzipDocode(bd)
} else {
resDetail += bd.String()
}
}
// fmt.Println(res_detail)
broadData.setData("res_detail", base64.StdEncoding.EncodeToString([]byte(resDetail)))
}
func (apiServer *APIServer) broadcastAPIReq(api *apiStruct, data *BroadCastData) {
apiServer.web.broadcastAPI(api, "req", data)
}
//判断是否需要将数据广播出去:有用户打开了页面在进行查看才广播
func (apiServer *APIServer) needBroadcast(api *apiStruct) bool {
if apiServer.web.wsServer.Count() < 1 {
return false
}
return api.analysisClientNum > 0
}