87 lines
1.4 KiB
Go
87 lines
1.4 KiB
Go
package echoserver
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import (
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"context"
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"errors"
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"io"
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"net"
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"strings"
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"go.uber.org/zap"
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"golang.org/x/sync/errgroup"
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)
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type EchoServer struct {
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listener net.Listener
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logger *zap.SugaredLogger
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}
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func New(opts ...Option) (*EchoServer, error) {
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listener, err := net.Listen("tcp", ":0")
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if err != nil {
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return nil, err
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}
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echoServer := &EchoServer{
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listener: listener,
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}
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// Apply options
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for _, opt := range opts {
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opt(echoServer)
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}
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// Apply defaults
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if echoServer.logger == nil {
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echoServer.logger = zap.NewNop().Sugar()
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}
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return echoServer, nil
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}
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func (echoServer *EchoServer) Addr() string {
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return strings.ReplaceAll(echoServer.listener.Addr().String(), "[::]", "127.0.0.1")
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}
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func (echoServer *EchoServer) Run(ctx context.Context) error {
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group, ctx := errgroup.WithContext(ctx)
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group.Go(func() error {
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<-ctx.Done()
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return echoServer.listener.Close()
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})
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group.Go(func() error {
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for {
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conn, err := echoServer.listener.Accept()
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if err != nil {
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if errors.Is(err, net.ErrClosed) {
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return nil
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}
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return err
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}
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group.Go(func() error {
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defer conn.Close()
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buf := make([]byte, 4096)
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_, err := io.CopyBuffer(conn, conn, buf)
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if err != nil {
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if errors.Is(err, io.EOF) {
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return nil
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}
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echoServer.logger.Warnf("connection failed: %v", err)
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}
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return nil
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})
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}
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})
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return group.Wait()
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}
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