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server.go
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server.go
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package core
import (
"io/ioutil"
"log"
"net/http"
"strconv"
"sync"
"time"
"github.com/fatih/structs"
"github.com/gorilla/mux"
)
func ServerSource() SourceSpec {
return SourceSpec{
Name: "server",
Type: SERVER,
New: NewServer,
}
}
type handlerRegistration struct {
c chan Request
name string
}
type Server struct {
quit chan bool
router *mux.Router
routes map[string]chan Request
addHandler chan handlerRegistration
removeHandler chan string
port int
sync.Mutex
}
func (s Server) GetType() SourceType {
return SERVER
}
func (s *Server) SetSourceParameter(name, value string) {
switch name {
}
}
func (s *Server) Describe() []map[string]string {
return []map[string]string{
{"name": "port", "value": strconv.Itoa(s.port)},
}
}
func NewServer() Source {
server := &Server{
quit: make(chan bool),
router: mux.NewRouter().StrictSlash(true),
routes: make(map[string]chan Request),
addHandler: make(chan handlerRegistration),
removeHandler: make(chan string),
}
return server
}
type Request struct {
responseWriter http.ResponseWriter
respChan chan error
request *http.Request
}
func (r Request) Write(p []byte) (n int, err error) {
nn, err := r.responseWriter.Write(p)
return nn, err
}
func (r Request) Close() error {
r.respChan <- nil
return nil
}
func (r Request) Flush() {
if flusher, ok := r.responseWriter.(http.Flusher); ok {
flusher.Flush()
} else {
log.Println("responseWriter can't flush")
}
}
func (s *Server) Serve() {
server := &http.Server{
Addr: ":8080",
Handler: s.router,
ReadTimeout: 10 * time.Second,
//WriteTimeout: 0 * time.Second,
MaxHeaderBytes: 1 << 20,
}
// base router
s.router.HandleFunc("/{name}", func(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
name := vars["name"]
outChan, ok := s.routes[name]
if !ok {
log.Println("404")
return
}
c := make(chan error)
outChan <- Request{w, c, r}
err := <-c
if err != nil {
log.Println(err)
}
}).Methods("GET", "POST", "PUT", "DELETE")
log.Println("starting HTTP server on", server.Addr)
go server.ListenAndServe()
for {
select {
case <-s.quit:
return
case f := <-s.addHandler:
log.Println("registring new handler", f.name)
s.routes[f.name] = f.c
case name := <-s.removeHandler:
log.Println("removing handler", name)
delete(s.routes, name)
}
}
}
func (s Server) Stop() {
s.quit <- true
}
// OutPin 0: received request
func FromRequest() Spec {
return Spec{
Name: "endpoint",
Inputs: []Pin{
Pin{"name", STRING},
},
Outputs: []Pin{
Pin{"request", OBJECT},
Pin{"writer", WRITER},
Pin{"body", STRING},
},
Source: SERVER,
Kernel: func(in, out, internal MessageMap, s Source, i chan Interrupt) Interrupt {
server := s.(*Server)
name, ok := in[0].(string)
if !ok {
log.Fatal("inputs must be strings")
}
requests := make(chan Request)
server.addHandler <- handlerRegistration{requests, name}
select {
case r := <-requests:
body, err := ioutil.ReadAll(r.request.Body)
if err != nil {
out[0] = NewError("could not read body")
return nil
}
out[0] = structs.Map(r.request)
out[1] = r
out[2] = string(body)
server.removeHandler <- name
case f := <-i:
server.removeHandler <- name
return f
}
return nil
},
}
}