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nsqadmin.go
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/
nsqadmin.go
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package main
import (
"bytes"
"encoding/json"
"fmt"
"net"
"net/http"
"net/url"
"os"
"time"
"github.com/bitly/nsq/util"
)
type NSQAdmin struct {
opts *nsqadminOptions
httpAddr *net.TCPAddr
httpListener net.Listener
waitGroup util.WaitGroupWrapper
notifications chan *AdminAction
graphiteURL *url.URL
}
func NewNSQAdmin(opts *nsqadminOptions) *NSQAdmin {
n := &NSQAdmin{
opts: opts,
notifications: make(chan *AdminAction),
}
if len(opts.NSQDHTTPAddresses) == 0 && len(opts.NSQLookupdHTTPAddresses) == 0 {
n.logf("--nsqd-http-address or --lookupd-http-address required.")
os.Exit(1)
}
if len(opts.NSQDHTTPAddresses) != 0 && len(opts.NSQLookupdHTTPAddresses) != 0 {
n.logf("use --nsqd-http-address or --lookupd-http-address not both")
os.Exit(1)
}
httpAddr, err := net.ResolveTCPAddr("tcp", opts.HTTPAddress)
if err != nil {
n.logf("FATAL: failed to resolve HTTP address (%s) - %s", opts.HTTPAddress, err)
os.Exit(1)
}
n.httpAddr = httpAddr
if opts.ProxyGraphite {
url, err := url.Parse(opts.GraphiteURL)
if err != nil {
n.logf("FATAL: failed to parse --graphite-url='%s' - %s", opts.GraphiteURL, err)
os.Exit(1)
}
n.graphiteURL = url
}
n.logf(util.Version("nsqlookupd"))
return n
}
func (n *NSQAdmin) logf(f string, args ...interface{}) {
if n.opts.Logger == nil {
return
}
n.opts.Logger.Output(2, fmt.Sprintf(f, args...))
}
func (n *NSQAdmin) handleAdminActions() {
for action := range n.notifications {
content, err := json.Marshal(action)
if err != nil {
n.logf("ERROR: failed to serialize admin action - %s", err)
}
httpclient := &http.Client{Transport: util.NewDeadlineTransport(10 * time.Second)}
n.logf("POSTing notification to %s", *notificationHTTPEndpoint)
_, err = httpclient.Post(*notificationHTTPEndpoint, "application/json", bytes.NewBuffer(content))
if err != nil {
n.logf("ERROR: failed to POST notification - %s", err)
}
}
}
func (n *NSQAdmin) Main() {
httpListener, err := net.Listen("tcp", n.httpAddr.String())
if err != nil {
n.logf("FATAL: listen (%s) failed - %s", n.httpAddr, err)
os.Exit(1)
}
n.httpListener = httpListener
httpServer := NewHTTPServer(&Context{n})
n.waitGroup.Wrap(func() {
util.HTTPServer(n.httpListener, httpServer, n.opts.Logger, "HTTP")
})
n.waitGroup.Wrap(func() { n.handleAdminActions() })
}
func (n *NSQAdmin) Exit() {
n.httpListener.Close()
close(n.notifications)
n.waitGroup.Wait()
}