/
worker_handler.go
106 lines (87 loc) · 2.24 KB
/
worker_handler.go
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package api
import (
"errors"
"log"
"net/http"
"sync"
sharedapi "code.cloudfoundry.org/loggregator-tools/reliability/api"
"github.com/gorilla/websocket"
)
var upgrader = websocket.Upgrader{
CheckOrigin: func(r *http.Request) bool { return true },
}
// WorkerHandler is a websocket handler that waits for Worker connections.
// It keeps track of each connection, so that when a test is started (via
// Run()), it can tell each connection about the test.
type WorkerHandler struct {
mu sync.RWMutex
conns map[*websocket.Conn]struct{}
}
// NewWorkerHandler builds a new WorkerHandler.
func NewWorkerHandler() *WorkerHandler {
return &WorkerHandler{
conns: make(map[*websocket.Conn]struct{}),
}
}
func (s *WorkerHandler) ConnCount() int {
s.mu.RLock()
defer s.mu.RUnlock()
return len(s.conns)
}
// Run writes the test information to each websocket connection.
func (s *WorkerHandler) Run(t *sharedapi.Test) (int, error) {
var conns []*websocket.Conn
s.mu.RLock()
for conn := range s.conns {
conns = append(conns, conn)
}
s.mu.RUnlock()
if len(conns) == 0 {
return 0, errors.New("you don't have any connections")
}
// Ensure each worker only writes the number of logs to stdout that will
// equate to the desired count.
t.WriteCycles = t.Cycles / uint64(len(conns))
remainder := t.Cycles % uint64(len(conns))
var writeCount int
for i, c := range conns {
if i == len(conns)-1 {
t.WriteCycles += remainder
}
err := c.WriteJSON(&t)
if err != nil {
log.Printf("Failed emit test: %s", err)
continue
}
writeCount++
}
return writeCount, nil
}
// ServeHTTP implements http.Handler. It only accepts websocket connections.
func (s *WorkerHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
log.Printf("failed to upgrade request to WS: %s", err)
w.WriteHeader(http.StatusBadRequest)
return
}
defer conn.Close()
s.mu.Lock()
s.conns[conn] = struct{}{}
s.mu.Unlock()
defer func() {
s.mu.Lock()
defer s.mu.Unlock()
delete(s.conns, conn)
log.Println("worker has been removed")
conn.Close()
}()
log.Println("worker has connected")
for {
_, _, err := conn.ReadMessage()
if err != nil {
log.Printf("read failed: %s", err)
break
}
}
}