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router.go
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router.go
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package main
import (
"compress/gzip"
"database/sql"
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"net/http"
"reflect"
"runtime"
"strings"
"time"
"github.com/gorilla/handlers"
"github.com/gorilla/mux"
"github.com/ovh/cds/engine/api/auth"
"github.com/ovh/cds/engine/api/context"
"github.com/ovh/cds/engine/api/database"
"github.com/ovh/cds/engine/api/hatchery"
"github.com/ovh/cds/engine/api/user"
"github.com/ovh/cds/engine/log"
"github.com/ovh/cds/sdk"
)
var router *Router
var panicked bool
var nbPanic int
var lastPanic *time.Time
const nbPanicsBeforeFail = 50
// Handler defines the HTTP handler used in CDS engine
type Handler func(w http.ResponseWriter, r *http.Request, db *sql.DB, c *context.Context)
// RouterConfigParam is the type of anonymous function returned by POST, GET and PUT functions
type RouterConfigParam func(rc *routerConfig)
type routerConfig struct {
get Handler
post Handler
put Handler
deleteHandler Handler
auth bool
isExecution bool
needAdmin bool
}
// ServeAbsoluteFile Serve file to download
func (r *Router) ServeAbsoluteFile(uri, path, filename string) {
f := func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/octet-stream")
w.Header().Set("Content-Disposition", fmt.Sprintf("attachment;filename=\"%s\"", filename))
http.ServeFile(w, r, path)
}
router.mux.HandleFunc(r.prefix+uri, f)
}
func compress(fn http.HandlerFunc) http.HandlerFunc {
return handlers.CompressHandlerLevel(fn, gzip.DefaultCompression).ServeHTTP
}
func recoverWrap(h http.HandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
var err error
defer func() {
if re := recover(); re != nil {
switch t := re.(type) {
case string:
err = errors.New(t)
case error:
err = re.(error)
case sdk.Error:
err = re.(sdk.Error)
default:
err = sdk.ErrUnknownError
}
log.Critical("[PANIC_RECOVERY] Panic occured on %s:%s, recover %s", req.Method, req.URL.String(), err)
trace := make([]byte, 4096)
count := runtime.Stack(trace, true)
log.Critical("[PANIC_RECOVERY] Stacktrace of %d bytes\n%s\n", count, trace)
//Reinit database connection
if _, e := database.Init(); e != nil {
log.Critical("[PANIC_RECOVERY] Unable to reinit db connection : %s", e)
}
//Checking if there are two much panics in two minutes
//If last panic was more than 2 minutes ago, reinit the panic counter
if lastPanic == nil {
nbPanic = 0
} else {
dur := time.Since(*lastPanic)
if dur.Minutes() > float64(2) {
log.Notice("[PANIC_RECOVERY] Last panic was %d seconds ago", int(dur.Seconds()))
nbPanic = 0
}
}
nbPanic++
now := time.Now()
lastPanic = &now
//If two much panic, change the status of /mon/status with panicked = true
if nbPanic > nbPanicsBeforeFail {
panicked = true
log.Critical("[PANIC_RECOVERY] RESTART NEEDED")
}
WriteError(w, req, err)
}
}()
h.ServeHTTP(w, req)
})
}
//Router is our base router struct
type Router struct {
authDriver auth.Driver
mux *mux.Router
prefix string
}
var mapRouterConfigs = map[string]*routerConfig{}
// Handle adds all handler for their specific verb in gorilla router for given uri
func (r *Router) Handle(uri string, handlers ...RouterConfigParam) {
uri = r.prefix + uri
rc := &routerConfig{auth: true, isExecution: false, needAdmin: false}
mapRouterConfigs[uri] = rc
for _, h := range handlers {
h(rc)
}
f := func(w http.ResponseWriter, req *http.Request) {
// Close indicates to close the connection after replying to this request
req.Close = true
// Authorization ?
w.Header().Add("Access-Control-Allow-Origin", "*")
w.Header().Add("Access-Control-Allow-Methods", "GET,OPTIONS,PUT,POST,DELETE")
w.Header().Add("Access-Control-Allow-Headers", "Accept, Origin, Referer, User-Agent, Content-Type, Authorization, Session-Token, Last-Event-Id")
w.Header().Add("Access-Control-Expose-Headers", "Accept, Origin, Referer, User-Agent, Content-Type, Authorization, Session-Token, Last-Event-Id")
c := &context.Context{}
if req.Method == "OPTIONS" {
w.WriteHeader(http.StatusOK)
return
}
//Check DB connection
db := database.DB()
if db == nil {
//We can handle database loss with hook.recovery
if req.URL.Path != "/hook" {
WriteError(w, req, sdk.ErrServiceUnavailable)
return
}
}
if rc.auth {
if err := r.checkAuthentication(db, req.Header, c); err != nil {
log.Warning("Authorization denied on %s %s for %s: %s\n", req.Method, req.URL, req.RemoteAddr, err)
WriteError(w, req, sdk.ErrUnauthorized)
return
}
}
permissionOk := true
if rc.auth && rc.needAdmin && !c.User.Admin {
permissionOk = false
} else if rc.auth && !rc.needAdmin && !c.User.Admin {
permissionOk = checkPermission(mux.Vars(req), c, getPermissionByMethod(req.Method, rc.isExecution))
}
if permissionOk {
start := time.Now()
defer func() {
end := time.Now()
latency := end.Sub(start)
log.Info("%-7s | %13v | %v", req.Method, latency, req.URL)
}()
if req.Method == "GET" && rc.get != nil {
rc.get(w, req, db, c)
return
}
if req.Method == "POST" && rc.post != nil {
rc.post(w, req, db, c)
return
}
if req.Method == "PUT" && rc.put != nil {
rc.put(w, req, db, c)
return
}
if req.Method == "DELETE" && rc.deleteHandler != nil {
rc.deleteHandler(w, req, db, c)
return
}
WriteError(w, req, sdk.ErrNotFound)
return
}
WriteError(w, req, sdk.ErrForbidden)
return
}
router.mux.HandleFunc(uri, compress(recoverWrap(f)))
}
// GET will set given handler only for GET request
func GET(h Handler) RouterConfigParam {
f := func(rc *routerConfig) {
rc.get = h
}
return f
}
// POST will set given handler only for POST request
func POST(h Handler) RouterConfigParam {
f := func(rc *routerConfig) {
rc.post = h
}
return f
}
// POSTEXECUTE will set given handler only for POST request and add a flag for execution permission
func POSTEXECUTE(h Handler) RouterConfigParam {
f := func(rc *routerConfig) {
rc.post = h
rc.isExecution = true
}
return f
}
// PUT will set given handler only for PUT request
func PUT(h Handler) RouterConfigParam {
f := func(rc *routerConfig) {
rc.put = h
}
return f
}
// NeedAdmin set the route for cds admin only (or not)
func NeedAdmin(admin bool) RouterConfigParam {
f := func(rc *routerConfig) {
rc.needAdmin = admin
}
return f
}
// DELETE will set given handler only for DELETE request
func DELETE(h Handler) RouterConfigParam {
f := func(rc *routerConfig) {
rc.deleteHandler = h
}
return f
}
func (r *Router) getRoute(method string, handler Handler, vars map[string]string) string {
sf1 := reflect.ValueOf(handler)
var url string
for uri, routerConfig := range mapRouterConfigs {
if strings.HasPrefix(uri, r.prefix) {
switch method {
case "GET":
sf2 := reflect.ValueOf(routerConfig.get)
if sf1.Pointer() == sf2.Pointer() {
url = uri
break
}
case "POST":
sf2 := reflect.ValueOf(routerConfig.post)
if sf1.Pointer() == sf2.Pointer() {
url = uri
break
}
case "PUT":
sf2 := reflect.ValueOf(routerConfig.put)
if sf1.Pointer() == sf2.Pointer() {
url = uri
break
}
case "DELETE":
sf2 := reflect.ValueOf(routerConfig.deleteHandler)
if sf1.Pointer() == sf2.Pointer() {
url = uri
break
}
}
}
}
for k, v := range vars {
url = strings.Replace(url, "{"+k+"}", v, -1)
}
if url == "" {
log.Debug("Cant find route for Handler %s %v", method, handler)
}
return url
}
// Auth set manually whether authorisation layer should be applied
// Authorization is enabled by default
func Auth(v bool) RouterConfigParam {
f := func(rc *routerConfig) {
rc.auth = v
}
return f
}
func (r *Router) checkAuthHeader(db *sql.DB, headers http.Header, c *context.Context) error {
return r.authDriver.GetCheckAuthHeaderFunc(localCLientAuthMode)(db, headers, c)
}
func (r *Router) checkAuthentication(db *sql.DB, headers http.Header, c *context.Context) error {
c.Agent = sdk.Agent(headers.Get("User-Agent"))
switch headers.Get("User-Agent") {
// TODO: case sdk.WorkerAgent should be moved here
case sdk.HatcheryAgent:
return r.checkHatcheryAuth(db, headers, c)
default:
return r.checkAuthHeader(db, headers, c)
}
}
func (r *Router) checkHatcheryAuth(db *sql.DB, headers http.Header, c *context.Context) error {
id, err := base64.StdEncoding.DecodeString(headers.Get(sdk.AuthHeader))
if err != nil {
return fmt.Errorf("bad worker key syntax: %s", err)
}
log.Debug("HatcheryAuth> Hatchery looking for auth (%s)\n", id)
h, err := hatchery.LoadHatchery(db, string(id))
if err != nil {
return err
}
log.Debug("HatcheryAuth> Loading permissions for group %d\n", h.GroupID)
c.User = &sdk.User{Username: h.Name}
g, err := user.LoadGroupPermissions(db, h.GroupID)
if err != nil {
return fmt.Errorf("cannot load group permissions: %s", err)
}
c.User.Groups = append(c.User.Groups, *g)
return nil
}
// WriteJSON is a helper function to marshal json, handle errors and set Content-Type for the best
func WriteJSON(w http.ResponseWriter, r *http.Request, data interface{}, status int) {
b, e := json.Marshal(data)
if e != nil {
log.Warning("writeJSON> unable to marshal : %s", e)
WriteError(w, r, sdk.ErrUnknownError)
return
}
w.Header().Add("Content-Type", "application/json")
w.WriteHeader(status)
w.Write(b)
}
func notFoundHandler(w http.ResponseWriter, req *http.Request) {
start := time.Now()
defer func() {
end := time.Now()
latency := end.Sub(start)
log.Warning("%-7s | %13v | %v", req.Method, latency, req.URL)
}()
WriteError(w, req, sdk.ErrNotFound)
}