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Use deadline for link handshake (#949)

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This uses a 6 second deadline for timeouts instead of using `util.FuncTimeout` at 30 seconds for the read and then again for the write.

If the handshake doesn't complete within 6 seconds then it's going to probably collapse when we give the connection to Ironwood and it tries to do a keepalive anyway.
This commit is contained in:
Neil Alexander 2022-09-24 16:51:31 +01:00 committed by GitHub
parent e165b1fa0c
commit d24d3fa047
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1 changed files with 11 additions and 23 deletions
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34
src/core/link.go
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@ -17,7 +17,6 @@ import (
"github.com/Arceliar/phony"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/util"
//"github.com/Arceliar/phony" // TODO? use instead of mutexes
)
@ -234,36 +233,25 @@ func (intf *link) handler() error {
delete(intf.links._links, intf.info)
})
// TODO split some of this into shorter functions, so it's easier to read, and for the FIXME duplicate peer issue mentioned later
meta := version_getBaseMetadata()
meta.key = intf.links.core.public
metaBytes := meta.encode()
// TODO timeouts on send/recv (goroutine for send/recv, channel select w/ timer)
var err error
if !util.FuncTimeout(30*time.Second, func() {
var n int
n, err = intf.conn.Write(metaBytes)
if err == nil && n != len(metaBytes) {
err = errors.New("incomplete metadata send")
}
}) {
return errors.New("timeout on metadata send")
if err := intf.conn.SetDeadline(time.Now().Add(time.Second * 6)); err != nil {
return fmt.Errorf("failed to set handshake deadline: %w", err)
}
if err != nil {
n, err := intf.conn.Write(metaBytes)
switch {
case err != nil:
return fmt.Errorf("write handshake: %w", err)
case err == nil && n != len(metaBytes):
return fmt.Errorf("incomplete handshake send")
}
if !util.FuncTimeout(30*time.Second, func() {
var n int
n, err = io.ReadFull(intf.conn, metaBytes)
if err == nil && n != len(metaBytes) {
err = errors.New("incomplete metadata recv")
}
}) {
return errors.New("timeout on metadata recv")
}
if err != nil {
if _, err = io.ReadFull(intf.conn, metaBytes); err != nil {
return fmt.Errorf("read handshake: %w", err)
}
if err := intf.conn.SetDeadline(time.Time{}); err != nil {
return fmt.Errorf("failed to clear handshake deadline: %w", err)
}
meta = version_metadata{}
base := version_getBaseMetadata()
if !meta.decode(metaBytes) {