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server.go
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server.go
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package dbhttp
import (
"encoding/json"
"fmt"
"github.com/fagbokforlaget/echodb/db"
"github.com/fagbokforlaget/echodb/dbwebsocket"
"github.com/gorilla/mux"
"github.com/justinas/alice"
"log"
"net/http"
"time"
)
func simpleLogger(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
t1 := time.Now()
next.ServeHTTP(w, r)
t2 := time.Now()
log.Println(r.RemoteAddr, r.Method, r.URL, 200, t2.Sub(t1))
})
}
func recoverHandler(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Printf("panic: %+v", err)
http.Error(w, http.StatusText(500), 500)
}
}()
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
func setHeaders(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
next.ServeHTTP(w, r)
})
}
// JSON Response
type Response map[string]interface{}
func (r Response) String() (s string) {
b, err := json.Marshal(r)
if err != nil {
s = ""
return
}
s = string(b)
return
}
func send(w http.ResponseWriter, r *http.Request, json Response) {
fmt.Fprint(w, json)
}
//Controllers
// root
func rootController(w http.ResponseWriter, r *http.Request) {
send(w, r, Response{"success": true, "message": "echodb http server is running!"})
}
// list all of collections
func collectionsController(w http.ResponseWriter, r *http.Request) {
cols := echodb.Collections()
send(w, r, Response{"success": true, "collections": cols})
}
// get a collection by name
func collectionController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
col := echodb.Get(params["name"])
send(w, r, Response{"success": true, "count": fmt.Sprintf("%v", col.Count())})
}
// create a collection
func newCollectionController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
status := false
err := echodb.Create(params["name"])
if err == nil {
status = true
}
send(w, r, Response{"success": status})
}
// delete a collection
func deleteCollectionController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
status := false
err := echodb.Delete(params["name"])
if err == nil {
status = true
}
send(w, r, Response{"success": status})
}
// list documents
func documentsController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
col := echodb.Get(params["name"])
if col == nil {
http.Error(w, http.StatusText(404), 404)
return
}
docs := make([]map[string]interface{}, 0)
for doc := range col.All() {
docs = append(docs, doc)
}
mj, je := json.Marshal(docs)
if je != nil {
fmt.Fprint(w, nil)
return
}
fmt.Fprint(w, string(mj))
}
// read document
func documentController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
col := echodb.Get(params["name"])
// status := false
id := params["id"]
doc, err := col.FindById(id)
if err == nil {
// status = true
}
send(w, r, doc)
}
// read document
func newDocumentController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
var doc map[string]interface{}
decoder := json.NewDecoder(r.Body)
err := decoder.Decode(&doc)
if err != nil {
http.Error(w, http.StatusText(400), 400)
return
}
col := echodb.Get(params["name"])
if col == nil {
http.Error(w, http.StatusText(404), 404)
return
}
id, docErr := col.Insert(doc)
if docErr != nil {
http.Error(w, http.StatusText(500), 500)
return
}
send(w, r, Response{"_id": id})
}
// update document
func updateDocumentController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
var doc map[string]interface{}
decoder := json.NewDecoder(r.Body)
err := decoder.Decode(&doc)
if err != nil {
http.Error(w, http.StatusText(400), 400)
return
}
col := echodb.Get(params["name"])
if col == nil {
http.Error(w, http.StatusText(404), 404)
return
}
id := params["id"]
docErr := col.Update(id, doc)
if docErr != nil {
http.Error(w, http.StatusText(500), 500)
return
}
send(w, r, doc)
}
// delete document
func deleteDocumentController(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
col := echodb.Get(params["name"])
if col == nil {
http.Error(w, http.StatusText(404), 404)
return
}
docErr := col.Delete(params["id"])
if docErr != nil {
http.Error(w, http.StatusText(500), 500)
return
}
send(w, r, Response{"_id": params["id"]})
}
func serveWs(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
dbwebsocket.ServeWs(params["name"], w, r)
}
// ROUTER
func router() {
stdChain := alice.New(simpleLogger, recoverHandler, setHeaders)
r := mux.NewRouter()
r.Handle("/", stdChain.Then(http.HandlerFunc(rootController)))
// collection routers
r.Handle("/colls", stdChain.Then(http.HandlerFunc(collectionsController))).Methods("GET")
r.Handle("/colls/{name}", stdChain.Then(http.HandlerFunc(collectionController))).Methods("GET")
r.Handle("/colls", stdChain.Then(http.HandlerFunc(newCollectionController))).Methods("POST")
r.Handle("/colls/{name}", stdChain.Then(http.HandlerFunc(deleteCollectionController))).Methods("DELETE")
// document routers
r.Handle("/colls/{name}/docs", stdChain.Then(http.HandlerFunc(documentsController))).Methods("GET")
r.Handle("/colls/{name}/docs/{id}", stdChain.Then(http.HandlerFunc(documentController))).Methods("GET")
r.Handle("/colls/{name}/docs", stdChain.Then(http.HandlerFunc(newDocumentController))).Methods("POST")
r.Handle("/colls/{name}/docs/{id}", stdChain.Then(http.HandlerFunc(updateDocumentController))).Methods("PUT")
r.Handle("/colls/{name}/docs/{id}", stdChain.Then(http.HandlerFunc(deleteDocumentController))).Methods("DELETE")
r.Handle("/ws/{name}", http.HandlerFunc(serveWs)).Methods("GET")
http.Handle("/", r)
return
}
var echodb *db.Database
// main function
func Start() {
echodb, _ = db.OpenDatabase("/tmp/echodb")
router()
port := ":8001"
log.Println("[HTTP Server]", port)
http.ListenAndServe(port, nil)
}