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More explanatory error message from Listen (#4534)

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* explain cryptic unix socket listener error related to process kill

https://github.com/caddyserver/caddy/pull/4533

* less ambiguous wording: clean up -> delete

* shorten error message explanation

* link back to pull request in comment for later archeaology
This commit is contained in:
Forest Johnson 2022-01-19 19:26:44 +00:00 committed by GitHub
parent a79b4055e5
commit b3f7ce34b4
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1 changed files with 23 additions and 0 deletions
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23
listeners.go
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@ -17,6 +17,7 @@ package caddy
import (
"fmt"
"net"
"os"
"strconv"
"strings"
"sync"
@ -39,6 +40,10 @@ func Listen(network, addr string) (net.Listener, error) {
sharedLn, _, err := listenerPool.LoadOrNew(lnKey, func() (Destructor, error) {
ln, err := net.Listen(network, addr)
if err != nil {
// https://github.com/caddyserver/caddy/pull/4534
if isUnixNetwork(network) && isListenBindAddressAlreadyInUseError(err) {
return nil, fmt.Errorf("%w: this can happen if Caddy was forcefully killed", err)
}
return nil, err
}
return &sharedListener{Listener: ln, key: lnKey}, nil
@ -59,6 +64,10 @@ func ListenPacket(network, addr string) (net.PacketConn, error) {
sharedPc, _, err := listenerPool.LoadOrNew(lnKey, func() (Destructor, error) {
pc, err := net.ListenPacket(network, addr)
if err != nil {
// https://github.com/caddyserver/caddy/pull/4534
if isUnixNetwork(network) && isListenBindAddressAlreadyInUseError(err) {
return nil, fmt.Errorf("%w: this can happen if Caddy was forcefully killed", err)
}
return nil, err
}
return &sharedPacketConn{PacketConn: pc, key: lnKey}, nil
@ -322,6 +331,20 @@ func isUnixNetwork(netw string) bool {
return netw == "unix" || netw == "unixgram" || netw == "unixpacket"
}
func isListenBindAddressAlreadyInUseError(err error) bool {
switch networkOperationError := err.(type) {
case *net.OpError:
switch syscallError := networkOperationError.Err.(type) {
case *os.SyscallError:
if syscallError.Syscall == "bind" {
return true
}
}
}
return false
}
// ParseNetworkAddress parses addr into its individual
// components. The input string is expected to be of
// the form "network/host:port-range" where any part is