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route.go
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route.go
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package rest
import (
"encoding/json"
"fmt"
"net/http"
"github.com/gorilla/mux"
"github.com/gorilla/sessions"
"github.com/michaeljs1990/sqlitestore"
)
type Endpoint struct {
Description string
Method string
Path string
F func(*Request) (interface{}, error)
}
type Endpoints []Endpoint
type Headers map[string]string
type dataWrapper struct {
Data interface{} `json:"data"`
}
type errorWrapper struct {
Error string `json:"error"`
}
type Router struct {
muxRouter *mux.Router
}
type CookieMeta struct {
File string
Path string
MaxAge int
Key []byte
StoreName string
}
func (this *Router) Start(port string) error {
return http.ListenAndServe(":"+port, this.muxRouter)
}
var store *sqlitestore.SqliteStore
func NewRouter(meta *CookieMeta, globalHeaders Headers, endpoints ...Endpoints) (*Router, error) {
router := mux.NewRouter().StrictSlash(true)
for _, endpointGroup := range endpoints {
for _, endpoint := range endpointGroup {
var handler http.Handler
handler = NewHandlerFunc(endpoint.F, meta, globalHeaders)
router.
Methods(endpoint.Method).
Path(endpoint.Path).
Name(endpoint.Description).
Handler(handler)
}
}
if meta != nil {
var err error
store, err = sqlitestore.NewSqliteStore(meta.File, "sessions", meta.Path, meta.MaxAge, meta.Key)
if err != nil {
return nil, err
}
}
return &Router{
muxRouter: router,
}, nil
}
func NewHandlerFunc(f func(*Request) (interface{}, error), meta *CookieMeta, globalHeaders Headers) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
req, err := NewRequest(r, meta)
if err != nil {
errorReturn(err, w)
return
}
result, err := f(req)
if err != nil {
errorReturn(err, w)
return
}
data := &dataWrapper{
Data: result,
}
var session *sessions.Session
if store != nil {
session, err = store.Get(r, meta.StoreName)
if err != nil {
errorReturn(err, w)
return
}
session.Values = req.getAllCookieValues()
err = store.Save(r, w, session)
if err != nil {
errorReturn(err, w)
return
}
}
for key, value := range globalHeaders {
w.Header().Set(key, value)
}
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusOK)
if err := json.NewEncoder(w).Encode(data); err != nil {
panic(err)
}
}
}
func errorReturn(err error, w http.ResponseWriter) {
error_string := &errorWrapper{
Error: fmt.Sprintf("Error: %v", err),
}
w.Header().Set("Content-Type", "application/json; charset=UTF-8")
w.WriteHeader(http.StatusInternalServerError)
if err := json.NewEncoder(w).Encode(error_string); err != nil {
panic(err)
}
}