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server.go
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server.go
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package alertify
import (
"crypto/tls"
"fmt"
"net"
"net/http"
"os"
"strings"
"syscall"
)
// API provides a simple HTTP API
type API struct {
h *http.Server
l net.Listener
}
// Context provides API service context
type Context struct {
msgChan chan *Msg
}
// newListener creates a new TCP listener
func newListener(proto, addr string, tlsConfig *tls.Config) (net.Listener, error) {
var (
l net.Listener
err error
)
switch proto {
case "unix", "unixpacket":
// Unix sockets must be unlink()ed before being reused again
if err := syscall.Unlink(addr); err != nil && !os.IsNotExist(err) {
return nil, err
}
l, err = net.Listen(proto, addr)
case "tcp":
l, err = net.Listen(proto, addr)
default:
return nil, fmt.Errorf("unsupported protocol: %q", proto)
}
if tlsConfig != nil {
//tlsConfig.NextProtos = []string{"http/1.1"}
l = tls.NewListener(l, tlsConfig)
}
return l, err
}
// NewAPI creates and configures API server
//
// NewAPI creates and initializes API server with provided configuration
// It returns error if either configuration is invalid or if API server could not be created
func NewAPI(ctx *Context, address string, tlsConfig *tls.Config) (*API, error) {
api := newRouter(ctx)
server := &http.Server{
Handler: api,
}
protoAddrParts := strings.SplitN(address, "://", 2)
if len(protoAddrParts) == 1 {
protoAddrParts = []string{"tcp", protoAddrParts[0]}
}
listener, err := newListener(protoAddrParts[0], protoAddrParts[1], tlsConfig)
if err != nil {
return nil, err
}
server.Addr = protoAddrParts[1]
return &API{
h: server,
l: listener,
}, nil
}
// ListenAndServe starts API server and listens for HTTP requests
//
// ListenAndServe blocks until http server returns error
// Due to its blocking behaviour this function should be run in its own goroutine
func (a *API) ListenAndServe() error {
return a.h.Serve(a.l)
}