mirror of
https://github.com/openziti/ziti.git
synced 2026-09-10 16:55:41 +00:00
Paul Lorenz
111 lines
2.9 KiB
Go
111 lines
2.9 KiB
Go
/*
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Copyright NetFoundry Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package handler_ctrl
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import (
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"math/rand/v2"
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"sync/atomic"
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"time"
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"github.com/openziti/ziti/v2/controller/config"
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)
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type routerDialStatus int
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const (
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statusNeedsDial routerDialStatus = iota
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statusDialing
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statusConnected
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)
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func (s routerDialStatus) String() string {
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switch s {
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case statusNeedsDial:
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return "NeedsDial"
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case statusDialing:
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return "Dialing"
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case statusConnected:
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return "Connected"
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default:
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return "Unknown"
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}
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}
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type routerDialState struct {
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routerId string
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addresses []string
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addrIndex int
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status routerDialStatus
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retryDelay time.Duration
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nextDial time.Time
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dialAttempts uint32
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connectedAt time.Time
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dialActive atomic.Bool
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}
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func (self *routerDialState) currentAddress() string {
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return self.addresses[self.addrIndex%len(self.addresses)]
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}
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func (self *routerDialState) nextAddress() {
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self.addrIndex = (self.addrIndex + 1) % len(self.addresses)
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}
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func (self *routerDialState) dialFailed(cfg *config.CtrlDialerConfig) {
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self.status = statusNeedsDial
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self.dialAttempts++
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factor := cfg.RetryBackoffFactor + (rand.Float64() - 0.5)
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if factor < 1 {
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factor = 1
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}
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self.retryDelay = time.Duration(float64(self.retryDelay) * factor)
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if self.retryDelay < cfg.MinRetryInterval {
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self.retryDelay = cfg.MinRetryInterval
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}
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if self.retryDelay > cfg.MaxRetryInterval {
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self.retryDelay = cfg.MaxRetryInterval
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}
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self.nextDial = time.Now().Add(self.retryDelay)
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self.nextAddress()
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}
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func (self *routerDialState) dialSucceeded() {
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self.status = statusConnected
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self.connectedAt = time.Now()
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// retryDelay is intentionally NOT reset here. If the connection dies within
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// FastFailureWindow, connectionLost() will continue the backoff progression.
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// retryDelay gets reset in connectionLost() for normal (long-lived) disconnects,
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// and in evaluateDialState() when the connection survives past FastFailureWindow.
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}
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func (self *routerDialState) connectionLost(cfg *config.CtrlDialerConfig) {
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if self.status == statusConnected && time.Since(self.connectedAt) < cfg.FastFailureWindow {
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// fast failure: connection died quickly, treat as a dial failure with backoff
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self.dialFailed(cfg)
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return
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}
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// normal disconnection: reset backoff and address index, retry immediately
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self.status = statusNeedsDial
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self.retryDelay = 0
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self.addrIndex = 0
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self.nextDial = time.Now()
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}
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