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Set self-adjusting deadline for connection writing (#16068) (#16123) 

In #16055 it appears that the simple 5s deadline doesn't work for large
file writes. Now we can't - or at least shouldn't just set no deadline
as go will happily let these connections block indefinitely. However,
what seems reasonable is to set some minimum rate we expect for writing.

This PR suggests the following algorithm:

* Every write has a minimum timeout of 5s (adjustable at compile time.)
* If there has been a previous write - then consider its previous
deadline, add half of the minimum timeout + 2s per kb about to written.
* If that new deadline is after the minimum timeout use that.

Fix #16055

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>
This commit is contained in:
zeripath 2021-06-10 22:26:32 +01:00 committed by GitHub
parent c1887bfc9b
commit f034804e5d
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 75 additions and 34 deletions
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4
custom/conf/app.example.ini
View File

@ -281,6 +281,10 @@ HTTP_PORT = 3000
; PORT_TO_REDIRECT.
REDIRECT_OTHER_PORT = false
PORT_TO_REDIRECT = 80
; Timeout for any write to the connection. (Set to 0 to disable all timeouts.)
PER_WRITE_TIMEOUT = 30s
; Timeout per Kb written to connections.
PER_WRITE_PER_KB_TIMEOUT = 30s
; Permission for unix socket
UNIX_SOCKET_PERMISSION = 666
; Local (DMZ) URL for Gitea workers (such as SSH update) accessing web service.

6
docs/content/doc/advanced/config-cheat-sheet.en-us.md
View File

@ -237,6 +237,9 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
most cases you do not need to change the default value. Alter it only if
your SSH server node is not the same as HTTP node. Do not set this variable
if `PROTOCOL` is set to `unix`.
- `PER_WRITE_TIMEOUT`: **30s**: Timeout for any write to the connection. (Set to 0 to
disable all timeouts.)
- `PER_WRITE_PER_KB_TIMEOUT`: **10s**: Timeout per Kb written to connections.
- `DISABLE_SSH`: **false**: Disable SSH feature when it's not available.
- `START_SSH_SERVER`: **false**: When enabled, use the built-in SSH server.
@ -260,6 +263,9 @@ Values containing `#` or `;` must be quoted using `` ` `` or `"""`.
- `SSH_KEY_TEST_PATH`: **/tmp**: Directory to create temporary files in when testing public keys using ssh-keygen, default is the system temporary directory.
- `SSH_KEYGEN_PATH`: **ssh-keygen**: Path to ssh-keygen, default is 'ssh-keygen' which means the shell is responsible for finding out which one to call.
- `SSH_EXPOSE_ANONYMOUS`: **false**: Enable exposure of SSH clone URL to anonymous visitors, default is false.
- `SSH_PER_WRITE_TIMEOUT`: **30s**: Timeout for any write to the SSH connections. (Set to
0 to disable all timeouts.)
- `SSH_PER_WRITE_PER_KB_TIMEOUT`: **10s**: Timeout per Kb written to SSH connections.
- `MINIMUM_KEY_SIZE_CHECK`: **true**: Indicate whether to check minimum key size with corresponding type.
- `OFFLINE_MODE`: **false**: Disables use of CDN for static files and Gravatar for profile pictures.

28
modules/graceful/server.go
View File

@ -17,6 +17,7 @@ import (
"time"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
)
var (
@ -26,11 +27,12 @@ var (
DefaultWriteTimeOut time.Duration
// DefaultMaxHeaderBytes default max header bytes
DefaultMaxHeaderBytes int
// PerWriteWriteTimeout timeout for writes
PerWriteWriteTimeout = 30 * time.Second
// PerWriteWriteTimeoutKbTime is a timeout taking account of how much there is to be written
PerWriteWriteTimeoutKbTime = 10 * time.Second
)
// PerWriteWriteTimeout timeout for writes
const PerWriteWriteTimeout = 5 * time.Second
func init() {
DefaultMaxHeaderBytes = 0 // use http.DefaultMaxHeaderBytes - which currently is 1 << 20 (1MB)
}
@ -48,6 +50,8 @@ type Server struct {
lock *sync.RWMutex
BeforeBegin func(network, address string)
OnShutdown func()
PerWriteTimeout time.Duration
PerWritePerKbTimeout time.Duration
}
// NewServer creates a server on network at provided address
@ -63,6 +67,8 @@ func NewServer(network, address, name string) *Server {
lock: &sync.RWMutex{},
network: network,
address: address,
PerWriteTimeout: setting.PerWriteTimeout,
PerWritePerKbTimeout: setting.PerWritePerKbTimeout,
}
srv.BeforeBegin = func(network, addr string) {
@ -227,6 +233,8 @@ func (wl *wrappedListener) Accept() (net.Conn, error) {
Conn: c,
server: wl.server,
closed: &closed,
perWriteTimeout: wl.server.PerWriteTimeout,
perWritePerKbTimeout: wl.server.PerWritePerKbTimeout,
}
wl.server.wg.Add(1)
@ -251,11 +259,21 @@ type wrappedConn struct {
net.Conn
server *Server
closed *int32
deadline time.Time
perWriteTimeout time.Duration
perWritePerKbTimeout time.Duration
}
func (w wrappedConn) Write(p []byte) (n int, err error) {
if PerWriteWriteTimeout > 0 {
_ = w.Conn.SetWriteDeadline(time.Now().Add(PerWriteWriteTimeout))
if w.perWriteTimeout > 0 {
minTimeout := time.Duration(len(p)/1024) * w.perWritePerKbTimeout
minDeadline := time.Now().Add(minTimeout).Add(w.perWriteTimeout)
w.deadline = w.deadline.Add(minTimeout)
if minDeadline.After(w.deadline) {
w.deadline = minDeadline
}
_ = w.Conn.SetWriteDeadline(w.deadline)
}
return w.Conn.Write(p)
}

10
modules/setting/setting.go
View File

@ -117,6 +117,8 @@ var (
GracefulRestartable bool
GracefulHammerTime time.Duration
StartupTimeout time.Duration
PerWriteTimeout = 30 * time.Second
PerWritePerKbTimeout = 10 * time.Second
StaticURLPrefix string
AbsoluteAssetURL string
@ -147,6 +149,8 @@ var (
TrustedUserCAKeys []string `ini:"SSH_TRUSTED_USER_CA_KEYS"`
TrustedUserCAKeysFile string `ini:"SSH_TRUSTED_USER_CA_KEYS_FILENAME"`
TrustedUserCAKeysParsed []gossh.PublicKey `ini:"-"`
PerWriteTimeout time.Duration `ini:"SSH_PER_WRITE_TIMEOUT"`
PerWritePerKbTimeout time.Duration `ini:"SSH_PER_WRITE_PER_KB_TIMEOUT"`
}{
Disabled: false,
StartBuiltinServer: false,
@ -159,6 +163,8 @@ var (
MinimumKeySizeCheck: true,
MinimumKeySizes: map[string]int{"ed25519": 256, "ed25519-sk": 256, "ecdsa": 256, "ecdsa-sk": 256, "rsa": 2048},
ServerHostKeys: []string{"ssh/gitea.rsa", "ssh/gogs.rsa"},
PerWriteTimeout: PerWriteTimeout,
PerWritePerKbTimeout: PerWritePerKbTimeout,
}
// Security settings
@ -607,6 +613,8 @@ func NewContext() {
GracefulRestartable = sec.Key("ALLOW_GRACEFUL_RESTARTS").MustBool(true)
GracefulHammerTime = sec.Key("GRACEFUL_HAMMER_TIME").MustDuration(60 * time.Second)
StartupTimeout = sec.Key("STARTUP_TIMEOUT").MustDuration(0 * time.Second)
PerWriteTimeout = sec.Key("PER_WRITE_TIMEOUT").MustDuration(PerWriteTimeout)
PerWritePerKbTimeout = sec.Key("PER_WRITE_PER_KB_TIMEOUT").MustDuration(PerWritePerKbTimeout)
defaultAppURL := string(Protocol) + "://" + Domain
if (Protocol == HTTP && HTTPPort != "80") || (Protocol == HTTPS && HTTPPort != "443") {
@ -772,6 +780,8 @@ func NewContext() {
}
SSH.ExposeAnonymous = sec.Key("SSH_EXPOSE_ANONYMOUS").MustBool(false)
SSH.PerWriteTimeout = sec.Key("SSH_PER_WRITE_TIMEOUT").MustDuration(PerWriteTimeout)
SSH.PerWritePerKbTimeout = sec.Key("SSH_PER_WRITE_PER_KB_TIMEOUT").MustDuration(PerWritePerKbTimeout)
if err = Cfg.Section("oauth2").MapTo(&OAuth2); err != nil {
log.Fatal("Failed to OAuth2 settings: %v", err)

3
modules/ssh/ssh_graceful.go
View File

@ -7,12 +7,15 @@ package ssh
import (
"code.gitea.io/gitea/modules/graceful"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"github.com/gliderlabs/ssh"
)
func listen(server *ssh.Server) {
gracefulServer := graceful.NewServer("tcp", server.Addr, "SSH")
gracefulServer.PerWriteTimeout = setting.SSH.PerWriteTimeout
gracefulServer.PerWritePerKbTimeout = setting.SSH.PerWritePerKbTimeout
err := gracefulServer.ListenAndServe(server.Serve)
if err != nil {