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minirest.go
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minirest.go
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package minirest
import (
"log"
"net/http"
"reflect"
"strings"
"github.com/julienschmidt/httprouter"
)
// Minirest is singleton for Minirest framework
type Minirest struct {
// Set to true for returning gzip encoded response globally
Gzip bool
services map[string]Service
controllers map[string]Controller
router *httprouter.Router
port string
ip string
}
type keyVal struct {
key string
val string
}
// New initiate new Minirest
func New() *Minirest {
return &Minirest{
services: make(map[string]Service),
controllers: make(map[string]Controller),
router: httprouter.New(),
}
}
// RunServer run http server
func (mn *Minirest) RunServer() {
var addr string
if mn.ip != "" {
addr += mn.ip
}
if mn.port != "" {
addr += ":" + mn.port
}
log.Fatal(http.ListenAndServe(addr, mn.router))
}
// ServeIP set http server IP
func (mn *Minirest) ServeIP(ip string) {
mn.ip = ip
}
// ServePort set http server port
func (mn *Minirest) ServePort(port string) {
mn.port = port
}
// AddService add service.
// Service must be pointer to struct
func (mn *Minirest) AddService(service Service) {
val := reflect.ValueOf(service)
service.Init()
servName := strings.Split(val.Type().String(), ".")
servNameStr := servName[len(servName)-1]
if _, ok := mn.services[servNameStr]; !ok {
mn.services[servNameStr] = service
}
}
// LinkService link service dest with services svc.
// If service not registered, it will automatically registered.
// Service must have fields with same name as services that want to be linked.
// example:
// type Service struct {
// UserService *UserService
// ItemService *ItemService
// }
func (mn *Minirest) LinkService(dest Service, svcs ...Service) {
var val reflect.Value
sname := strings.Split(reflect.ValueOf(dest).Type().String(), ".")
snamestr := sname[len(sname)-1]
if svc, ok := mn.services[snamestr]; ok {
val = reflect.ValueOf(svc).Elem()
} else {
dest.Init()
mn.AddService(dest)
val = reflect.ValueOf(dest).Elem()
}
for _, svc := range svcs {
sname := strings.Split(reflect.ValueOf(svc).Type().String(), ".")
snamestr := sname[len(sname)-1]
f := val.FieldByName(snamestr)
if !f.IsValid() {
panic(snamestr + " cannot be linked to service: no match field exist")
}
if regsrv, ok := mn.services[snamestr]; ok {
f.Set(reflect.ValueOf(regsrv))
} else {
svc.Init()
f.Set(reflect.ValueOf(svc))
mn.AddService(svc)
}
}
}
// AddController add controller.
// You can link services srv into controller, see Controller and AddService for more information.
// If service is not registered, it will automatically register it
func (mn *Minirest) AddController(controller Controller, srv ...Service) {
val := reflect.ValueOf(controller)
if val.Kind() == reflect.Ptr {
val = val.Elem()
} else {
val = reflect.New(val.Type()).Elem()
}
// if srv not nil, link services to controller
if srv != nil || len(srv) != 0 {
for _, s := range srv {
sname := strings.Split(reflect.ValueOf(s).Type().String(), ".")
snamestr := sname[len(sname)-1]
f := val.FieldByName(snamestr)
if !f.IsValid() {
panic(snamestr + " cannot be linked to controller: no match field exist")
}
if regsrv, ok := mn.services[snamestr]; ok {
f.Set(reflect.ValueOf(regsrv))
} else {
s.Init()
f.Set(reflect.ValueOf(s))
mn.AddService(s)
}
}
}
// call controller.Endpoints and register all endpoints
endpoints := controller.Endpoints()
for _, endpoint := range endpoints.endpoints {
method := strings.ToLower(endpoint.method)
var handle httprouter.Handle
if method == "get" || method == "delete" {
if endpoints.middleware != nil {
handle = endpoints.middleware.handleChain(handleWithoutBody(endpoint.callback))
} else {
handle = handleWithoutBody(endpoint.callback)
}
if endpoints.Gzip || mn.Gzip {
handle = makeGzipHandler(handle)
}
mn.router.Handle(endpoint.method, endpoints.basePath+endpoint.path, handle)
}
if method == "post" || method == "put" || method == "patch" {
if endpoints.middleware != nil {
handle = endpoints.middleware.handleChain(handleWithBody(endpoint.callback))
} else {
handle = handleWithBody(endpoint.callback)
}
if endpoints.Gzip || mn.Gzip {
handle = makeGzipHandler(handle)
}
mn.router.Handle(endpoint.method, endpoints.basePath+endpoint.path, handle)
}
}
ctrlName := strings.Split(val.Type().String(), ".")
mn.controllers[ctrlName[len(ctrlName)-1]] = controller
}
// CORS set CORS
func (mn *Minirest) CORS(opt CORSOption) {
mn.router.HandleMethodNotAllowed = true
mn.router.HandleOPTIONS = true
mn.router.GlobalOPTIONS = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("Access-Control-Request-Method") != "" {
header := w.Header()
if opt.AllowOrigin != "" {
header.Add("Access-Control-Allow-Origin", opt.AllowOrigin)
}
if opt.AllowCredentials != "" {
header.Add("Access-Control-Allow-Credentials", opt.AllowCredentials)
}
if opt.ExposeHeaders != "" {
header.Add("Access-Control-Expose-Headers", opt.ExposeHeaders)
}
if opt.AllowHeaders != "" {
header.Add("Access-Control-Allow-Headers", opt.AllowHeaders)
}
if opt.AllowMethods != "" {
header.Add("Access-Control-Allow-Methods", opt.AllowMethods)
}
}
w.WriteHeader(http.StatusNoContent)
})
}
// CORSOption set options for CORS headers
type CORSOption struct {
AllowOrigin string
AllowCredentials string
ExposeHeaders string
AllowHeaders string
AllowMethods string
}