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package handlers
import (
"errors"
"fmt"
"time"
"github.com/mimecast/dtail/internal"
)
// HealthHandler implements the handler required for health checks.
type HealthHandler struct {
done *internal.Done
// Buffer of incoming data from server.
receiveBuf []byte
// To send commands to the server.
commands chan string
// To receive messages from the server.
receive chan<- string
// The remote server address
server string
// The return status.
status int
}
// NewHealthHandler returns a new health check handler.
func NewHealthHandler(server string, receive chan<- string) *HealthHandler {
h := HealthHandler{
server: server,
receive: receive,
commands: make(chan string),
status: -1,
done: internal.NewDone(),
}
return &h
}
// Server returns the remote server name.
func (h *HealthHandler) Server() string {
return h.server
}
// Status of the handler.
func (h *HealthHandler) Status() int {
return h.status
}
// Done returns done channel of the handler.
func (h *HealthHandler) Done() <-chan struct{} {
return h.done.Done()
}
// Shutdown the handler.
func (h *HealthHandler) Shutdown() {
h.done.Shutdown()
}
// SendMessage sends a DTail command to the server.
func (h *HealthHandler) SendMessage(command string) error {
select {
case h.commands <- fmt.Sprintf("%s;", command):
case <-time.NewTimer(time.Second * 10).C:
return errors.New("Timed out sending command " + command)
case <-h.Done():
}
return nil
}
// Server writes byte stream to client.
func (h *HealthHandler) Write(p []byte) (n int, err error) {
for _, b := range p {
h.receiveBuf = append(h.receiveBuf, b)
if b == '\n' {
h.receive <- string(h.receiveBuf)
h.receiveBuf = h.receiveBuf[:0]
}
}
return len(p), nil
}
// Server reads byte stream from client.
func (h *HealthHandler) Read(p []byte) (n int, err error) {
n = copy(p, []byte(<-h.commands))
return
}
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