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package inform
import (
"container/list"
"errors"
"fmt"
"log"
"net/http"
"sync"
"time"
)
func Log(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
handler.ServeHTTP(w, r)
t := time.Now().Format("02/Jan/2006 15:04:05")
log.Printf("%s - - [%s] \"%s %s %s\"", r.RemoteAddr, t, r.Method, r.URL, r.Proto)
})
}
type Device struct {
Initialized bool
CurrentState bool
DesiredState bool
*sync.Mutex
}
type InformHandler struct {
Codec *Codec
ports map[string]map[int]*Device
queue map[string]*list.List
*sync.RWMutex
}
func NewInformHandler(c *Codec) *InformHandler {
return &InformHandler{
Codec: c,
ports: make(map[string]map[int]*Device),
queue: make(map[string]*list.List),
RWMutex: &sync.RWMutex{},
}
}
func (h *InformHandler) AddPort(dev string, port int) {
h.Lock()
defer h.Unlock()
_, ok := h.ports[dev]
if !ok {
h.ports[dev] = make(map[int]*Device)
}
_, ok = h.queue[dev]
if !ok {
log.Printf("Adding queue for %s", dev)
h.queue[dev] = list.New()
}
log.Printf("Adding %s port %d", dev, port)
h.ports[dev][port] = &Device{
Mutex: &sync.Mutex{},
}
}
func (h *InformHandler) getPort(dev string, port int) (*Device, error) {
h.RLock()
defer h.RUnlock()
_, ok := h.ports[dev]
if !ok {
return nil, errors.New("No device found")
}
p, ok := h.ports[dev][port]
if !ok {
return nil, errors.New("No port found")
}
return p, nil
}
func (h *InformHandler) SetState(dev string, port int, state bool) error {
p, err := h.getPort(dev, port)
if err != nil {
return err
}
p.Lock()
defer p.Unlock()
log.Printf("Set state to %t for %s port %d", state, dev, port)
p.DesiredState = state
return nil
}
func (h *InformHandler) buildCommands(dev string, pl *DeviceMessage) error {
for _, o := range pl.Outputs {
ds, err := h.getPort(dev, o.Port)
if err != nil {
return err
}
ds.Lock()
// Get initial state
if !ds.Initialized {
ds.CurrentState = o.OutputState
ds.Initialized = true
return nil
}
// State didn't change at the sensor
if ds.CurrentState == o.OutputState {
if ds.DesiredState != o.OutputState {
log.Printf("Toggle state %t for %s port %d", ds.DesiredState, dev, o.Port)
// Generate change command
// TODO: Don't lock the whole handler
h.Lock()
h.queue[dev].PushFront(NewOutputCommand(o.Port, ds.DesiredState, 0))
h.Unlock()
}
} else { // Sensor caused the change, leave it alone
log.Printf("Sensor state changed %s port %d", dev, o.Port)
ds.DesiredState = o.OutputState
}
ds.CurrentState = o.OutputState
ds.Unlock() // Don't hold the lock the entire loop
}
return nil
}
func (h *InformHandler) pop(dev string) *CommandMessage {
// TODO: Don't lock the whole handler
h.Lock()
defer h.Unlock()
q, ok := h.queue[dev]
if !ok {
log.Printf("No queue for %s", dev)
return nil
}
e := q.Front()
if e != nil {
h.queue[dev].Remove(e)
cmd := e.Value.(*CommandMessage)
cmd.Freshen()
return cmd
}
return nil
}
func (h *InformHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
if r.Method != http.MethodPost {
http.Error(w, "405 Method Not Allowed", http.StatusMethodNotAllowed)
return
}
msg, err := h.Codec.Unmarshal(r.Body)
if err != nil {
log.Printf("Unmarshal message: %s", err.Error())
http.Error(w, "400 Bad Request", http.StatusBadRequest)
return
}
pl, err := msg.UnmarshalPayload()
if err != nil {
log.Printf("Unmarshal payload: %s", err.Error())
http.Error(w, "400 Bad Request", http.StatusBadRequest)
return
}
dev := msg.FormattedMac()
ret := NewInformWrapperResponse(msg)
log.Printf("Inform from %s", dev)
// Send a command until the queue is empty
if cmd := h.pop(dev); cmd != nil {
ret.UpdatePayload(cmd)
} else {
// Update internal state vs reality
if err := h.buildCommands(msg.FormattedMac(), pl); err != nil {
http.Error(w, "500 Server Error", 500)
return
}
// If that generated a command send it
if cmd = h.pop(dev); cmd != nil {
ret.UpdatePayload(cmd)
} else {
// Otherwise noop
ret.UpdatePayload(NewNoop(10))
}
}
res, err := h.Codec.Marshal(ret)
if err != nil {
http.Error(w, "500 Server Error", 500)
return
}
fmt.Fprintf(w, "%s", res)
}
// Create a new server, returns the mux so users can add other methods (for
// example, if they want to share a process to build a console that also
// accepts informs)
func NewServer(handler *InformHandler) (*http.Server, *http.ServeMux) {
mux := http.NewServeMux()
mux.Handle("/inform", handler)
return &http.Server{
Addr: ":6080",
Handler: Log(mux),
}, mux
}
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