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server.go
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server.go
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package goexpose
import (
"fmt"
"net/http"
"time"
"io/ioutil"
"runtime/debug"
"os"
"strings"
"github.com/golang/glog"
"github.com/gorilla/mux"
)
var (
logo = `
______ ______ ______ __ __ ______ ______ ______ ______
/\ ___\/\ __ \/\ ___/\_\_\_\/\ == /\ __ \/\ ___\/\ ___\
\ \ \__ \ \ \/\ \ \ __\/_/\_\/\ \ _-\ \ \/\ \ \___ \ \ __\
\ \_____\ \_____\ \_____/\_\/\_\ \_\ \ \_____\/\_____\ \_____\
\/_____/\/_____/\/_____\/_/\/_/\/_/ \/_____/\/_____/\/_____/
version: %v`
)
/*
Returns new server instance
*/
func NewServer(config *Config) (server *Server, err error) {
server = &Server{
Config: config,
Version: VERSION,
}
return
}
/*
Goexpose server
*/
type Server struct {
// config instance
Config *Config
// Version
Version string
// Router
Router *mux.Router
}
/*
Runs http server
*/
func (s *Server) Run() (err error) {
glog.V(2).Infof(logo, s.Version)
if s.Router, err = s.router(); err != nil {
return
}
// construct listen from host and port
listen := fmt.Sprintf("%s:%d", s.Config.Host, s.Config.Port)
// ssl version
if s.Config.SSL != nil {
glog.Infof("Start listen on https://%s", listen)
if err = http.ListenAndServeTLS(listen, s.Config.SSL.Cert, s.Config.SSL.Key, s.Router); err != nil {
return
}
} else {
glog.Infof("Start listen on http://%s", listen)
if err = http.ListenAndServe(listen, s.Router); err != nil {
return
}
}
return
}
/*
Creates new mux.Router registers all tasks to it and returns it.
*/
func (s *Server) router(ignored ...string) (router *mux.Router, err error) {
// create new router
router = mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(s.NotFoundHandler)
var routes []*route
if routes, err = s.routes(ignored...); err != nil {
return
}
for _, route := range routes {
// Log registered route
glog.V(2).Infof("Register route for task: %s path: %s method: %v",
route.TaskConfig.Type, route.Path, route.Method)
// register route to router
router.HandleFunc(route.Path, s.Handle(route.Task, route.Authorizers, route.EndpointConfig, route.TaskConfig)).Methods(route.Method).Name(route.EndpointConfig.RouteName())
}
return
}
/*
Route
*/
type route struct {
Authorizers Authorizers
Method string
Path string
TaskConfig *TaskConfig
EndpointConfig *EndpointConfig
Task Tasker
}
/*
Returns prepared routes
*/
func (s *Server) routes(ignored ...string) (routes []*route, err error) {
var (
authorizers Authorizers
factory TaskFactory
ok bool
tasks []Tasker
)
routes = []*route{}
// Get all authorizers
if authorizers, err = GetAuthorizers(s.Config); err != nil {
return
}
Outer:
for _, econfig := range s.Config.Endpoints {
if err = econfig.Validate(); err != nil {
return
}
for method, taskconf := range econfig.Methods {
// ignored task
for _, it := range ignored {
if taskconf.Type == it {
continue Outer
}
}
// validate task config
if err = taskconf.Validate(); err != nil {
return
}
if factory, ok = getTaskFactory(taskconf.Type); !ok {
err = fmt.Errorf("task %s doesn't exist", taskconf.Type)
return
}
if tasks, err = factory(s, &taskconf, econfig); err != nil {
err = fmt.Errorf("task %s returned error: %s", taskconf.Type, err)
return
}
for _, task := range tasks {
path := econfig.Path + task.Path()
r := &route{
Authorizers: authorizers,
EndpointConfig: econfig,
Path: path,
Task: task,
TaskConfig: &taskconf,
Method: method,
}
routes = append(routes, r)
}
}
}
return
}
/*
Handle func
*/
func (s *Server) Handle(task Tasker, authorizers Authorizers, ec *EndpointConfig, tc *TaskConfig) http.HandlerFunc {
env := s.GetEnv()
return func(w http.ResponseWriter, r *http.Request) {
t := time.Now()
defer func() {
if e := recover(); e != nil {
debug.PrintStack()
NewResponse(http.StatusInternalServerError).Pretty(s.Config.PrettyJson).Error(e).Write(w, r, t)
}
}()
// run authorizers on request
if err := authorizers.Authorize(r, ec); err != nil {
NewResponse(http.StatusUnauthorized).Write(w, r, t)
return
}
// read request body
var body = ""
if r.Body != nil {
if b, err := ioutil.ReadAll(r.Body); err != nil {
body = string(b)
}
}
/*
prepare data for task
mux vars are under "url"
cleaned query params are under "query"
*/
params := map[string]interface{}{
"url": mux.Vars(r),
"query": s.GetQueryParams(r, ec),
"request": map[string]interface{}{
"method": r.Method,
"body": body,
},
}
// reload environment every request?
if s.Config.ReloadEnv {
params["env"] = s.GetEnv()
} else {
params["env"] = env
}
// prepare response
response := task.Run(r, params)
// should i add params
if ec.QueryParams != nil {
if ec.QueryParams.ReturnParams {
response = response.AddValue("params", params)
}
}
mqp := ec.Methods[r.Method].QueryParams
if mqp != nil {
if mqp.ReturnParams && !response.HasValue("params") {
response = response.AddValue("params", params)
}
}
response.Write(w, r, t)
}
}
/*
Handler for not found
*/
func (s *Server) NotFoundHandler(w http.ResponseWriter, r *http.Request) {
t := time.Now()
NewResponse(http.StatusNotFound).Write(w, r, t)
}
/*
Returns
*/
func (s *Server) GetQueryParams(r *http.Request, ec *EndpointConfig) (result map[string]string) {
result = map[string]string{}
if ec.QueryParams != nil {
result = ec.QueryParams.GetParams(r)
return
}
for k, v := range ec.Methods[r.Method].QueryParams.GetParams(r) {
result[k] = v
}
return
}
/*
Get environment variables
*/
func (s *Server) GetEnv() map[string]interface{} {
result := map[string]interface{}{}
for _, v := range os.Environ() {
splitted := strings.SplitN(v, "=", 2)
if len(splitted) != 2 {
continue
}
key, value := strings.TrimSpace(splitted[0]), strings.TrimSpace(splitted[1])
result[key] = value
}
return result
}