github.com/spotify/syslog-redirector-golang@v0.0.0-20140320174030-4859f03d829a/src/pkg/net/mockserver_test.go (about)

     1  // Copyright 2013 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package net
     6  
     7  import "sync"
     8  
     9  type streamListener struct {
    10  	net, addr string
    11  	ln        Listener
    12  }
    13  
    14  type dualStackServer struct {
    15  	lnmu sync.RWMutex
    16  	lns  []streamListener
    17  	port string
    18  
    19  	cmu sync.RWMutex
    20  	cs  []Conn // established connections at the passive open side
    21  }
    22  
    23  func (dss *dualStackServer) buildup(server func(*dualStackServer, Listener)) error {
    24  	for i := range dss.lns {
    25  		go server(dss, dss.lns[i].ln)
    26  	}
    27  	return nil
    28  }
    29  
    30  func (dss *dualStackServer) putConn(c Conn) error {
    31  	dss.cmu.Lock()
    32  	dss.cs = append(dss.cs, c)
    33  	dss.cmu.Unlock()
    34  	return nil
    35  }
    36  
    37  func (dss *dualStackServer) teardownNetwork(net string) error {
    38  	dss.lnmu.Lock()
    39  	for i := range dss.lns {
    40  		if net == dss.lns[i].net && dss.lns[i].ln != nil {
    41  			dss.lns[i].ln.Close()
    42  			dss.lns[i].ln = nil
    43  		}
    44  	}
    45  	dss.lnmu.Unlock()
    46  	return nil
    47  }
    48  
    49  func (dss *dualStackServer) teardown() error {
    50  	dss.lnmu.Lock()
    51  	for i := range dss.lns {
    52  		if dss.lns[i].ln != nil {
    53  			dss.lns[i].ln.Close()
    54  		}
    55  	}
    56  	dss.lnmu.Unlock()
    57  	dss.cmu.Lock()
    58  	for _, c := range dss.cs {
    59  		c.Close()
    60  	}
    61  	dss.cmu.Unlock()
    62  	return nil
    63  }
    64  
    65  func newDualStackServer(lns []streamListener) (*dualStackServer, error) {
    66  	dss := &dualStackServer{lns: lns, port: "0"}
    67  	for i := range dss.lns {
    68  		ln, err := Listen(dss.lns[i].net, dss.lns[i].addr+":"+dss.port)
    69  		if err != nil {
    70  			dss.teardown()
    71  			return nil, err
    72  		}
    73  		dss.lns[i].ln = ln
    74  		if dss.port == "0" {
    75  			if _, dss.port, err = SplitHostPort(ln.Addr().String()); err != nil {
    76  				dss.teardown()
    77  				return nil, err
    78  			}
    79  		}
    80  	}
    81  	return dss, nil
    82  }