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| 1 | +package edge |
| 2 | + |
| 3 | +import ( |
| 4 | + "github.com/michaelquigley/pfxlog" |
| 5 | + "github.com/openziti/channel/v4" |
| 6 | + "io" |
| 7 | + "sync/atomic" |
| 8 | + "time" |
| 9 | +) |
| 10 | + |
| 11 | +const ( |
| 12 | + ChannelTypeControl string = "edge.control" |
| 13 | + ChannelTypeDefault string = "edge.default" |
| 14 | +) |
| 15 | + |
| 16 | +func NewBaseSdkChannel(underlay channel.Underlay) *BaseSdkChannel { |
| 17 | + senderContext := channel.NewSenderContext() |
| 18 | + |
| 19 | + defaultMsgChan := make(chan channel.Sendable, 4) |
| 20 | + controlMsgChan := make(chan channel.Sendable, 4) |
| 21 | + retryMsgChan := make(chan channel.Sendable, 4) |
| 22 | + |
| 23 | + result := &BaseSdkChannel{ |
| 24 | + SenderContext: senderContext, |
| 25 | + id: underlay.ConnectionId(), |
| 26 | + defaultSender: channel.NewSingleChSender(senderContext, defaultMsgChan), |
| 27 | + controlSender: channel.NewSingleChSender(senderContext, controlMsgChan), |
| 28 | + controlMsgChan: controlMsgChan, |
| 29 | + defaultMsgChan: defaultMsgChan, |
| 30 | + retryMsgChan: retryMsgChan, |
| 31 | + } |
| 32 | + return result |
| 33 | +} |
| 34 | + |
| 35 | +type BaseSdkChannel struct { |
| 36 | + id string |
| 37 | + ch channel.MultiChannel |
| 38 | + channel.SenderContext |
| 39 | + controlSender channel.Sender |
| 40 | + defaultSender channel.Sender |
| 41 | + |
| 42 | + controlChannelAvailable atomic.Bool |
| 43 | + controlMsgChan chan channel.Sendable |
| 44 | + defaultMsgChan chan channel.Sendable |
| 45 | + retryMsgChan chan channel.Sendable |
| 46 | +} |
| 47 | + |
| 48 | +func (self *BaseSdkChannel) InitChannel(ch channel.MultiChannel) { |
| 49 | + self.ch = ch |
| 50 | +} |
| 51 | + |
| 52 | +func (self *BaseSdkChannel) GetChannel() channel.Channel { |
| 53 | + return self.ch |
| 54 | +} |
| 55 | + |
| 56 | +func (self *BaseSdkChannel) GetDefaultSender() channel.Sender { |
| 57 | + return self.defaultSender |
| 58 | +} |
| 59 | + |
| 60 | +func (self *BaseSdkChannel) GetControlSender() channel.Sender { |
| 61 | + return self.controlSender |
| 62 | +} |
| 63 | + |
| 64 | +func (self *BaseSdkChannel) GetNextMsgDefault() (channel.Sendable, error) { |
| 65 | + if self.controlChannelAvailable.Load() { |
| 66 | + select { |
| 67 | + case msg := <-self.defaultMsgChan: |
| 68 | + return msg, nil |
| 69 | + case msg := <-self.retryMsgChan: |
| 70 | + return msg, nil |
| 71 | + case <-self.GetCloseNotify(): |
| 72 | + return nil, io.EOF |
| 73 | + } |
| 74 | + } else { |
| 75 | + select { |
| 76 | + case msg := <-self.defaultMsgChan: |
| 77 | + return msg, nil |
| 78 | + case msg := <-self.controlMsgChan: |
| 79 | + return msg, nil |
| 80 | + case msg := <-self.retryMsgChan: |
| 81 | + return msg, nil |
| 82 | + case <-self.GetCloseNotify(): |
| 83 | + return nil, io.EOF |
| 84 | + } |
| 85 | + } |
| 86 | +} |
| 87 | + |
| 88 | +func (self *BaseSdkChannel) GetNextControlMsg() (channel.Sendable, error) { |
| 89 | + select { |
| 90 | + case msg := <-self.controlMsgChan: |
| 91 | + return msg, nil |
| 92 | + case msg := <-self.retryMsgChan: |
| 93 | + return msg, nil |
| 94 | + case <-self.GetCloseNotify(): |
| 95 | + return nil, io.EOF |
| 96 | + } |
| 97 | +} |
| 98 | + |
| 99 | +func (self *BaseSdkChannel) GetMessageSource(underlay channel.Underlay) channel.MessageSourceF { |
| 100 | + if channel.GetUnderlayType(underlay) == ChannelTypeControl { |
| 101 | + return self.GetNextControlMsg |
| 102 | + } |
| 103 | + return self.GetNextMsgDefault |
| 104 | +} |
| 105 | + |
| 106 | +func (self *BaseSdkChannel) HandleTxFailed(_ channel.Underlay, sendable channel.Sendable) bool { |
| 107 | + select { |
| 108 | + case self.retryMsgChan <- sendable: |
| 109 | + return true |
| 110 | + case self.defaultMsgChan <- sendable: |
| 111 | + return true |
| 112 | + default: |
| 113 | + return false |
| 114 | + } |
| 115 | +} |
| 116 | + |
| 117 | +func (self *BaseSdkChannel) HandleUnderlayAccepted(ch channel.MultiChannel, underlay channel.Underlay) { |
| 118 | + self.UpdateCtrlChannelAvailable(ch) |
| 119 | + pfxlog.Logger(). |
| 120 | + WithField("id", ch.Label()). |
| 121 | + WithField("underlays", ch.GetUnderlayCountsByType()). |
| 122 | + WithField("underlayType", channel.GetUnderlayType(underlay)). |
| 123 | + WithField("controlAvailable", self.controlChannelAvailable.Load()). |
| 124 | + Info("underlay added") |
| 125 | +} |
| 126 | + |
| 127 | +func (self *BaseSdkChannel) UpdateCtrlChannelAvailable(ch channel.MultiChannel) { |
| 128 | + self.controlChannelAvailable.Store(ch.GetUnderlayCountsByType()[ChannelTypeControl] > 0) |
| 129 | +} |
| 130 | + |
| 131 | +func NewDialSdkChannel(dialer channel.DialUnderlayFactory, underlay channel.Underlay) UnderlayHandlerSdkChannel { |
| 132 | + result := &DialSdkChannel{ |
| 133 | + BaseSdkChannel: *NewBaseSdkChannel(underlay), |
| 134 | + dialer: dialer, |
| 135 | + } |
| 136 | + |
| 137 | + result.constraints.AddConstraint(ChannelTypeDefault, 1, 1) |
| 138 | + result.constraints.AddConstraint(ChannelTypeControl, 1, 0) |
| 139 | + |
| 140 | + return result |
| 141 | +} |
| 142 | + |
| 143 | +type UnderlayHandlerSdkChannel interface { |
| 144 | + SdkChannel |
| 145 | + channel.UnderlayHandler |
| 146 | +} |
| 147 | + |
| 148 | +type SdkChannel interface { |
| 149 | + InitChannel(channel.MultiChannel) |
| 150 | + GetChannel() channel.Channel |
| 151 | + GetDefaultSender() channel.Sender |
| 152 | + GetControlSender() channel.Sender |
| 153 | +} |
| 154 | + |
| 155 | +type DialSdkChannel struct { |
| 156 | + BaseSdkChannel |
| 157 | + dialer channel.DialUnderlayFactory |
| 158 | + constraints channel.UnderlayConstraints |
| 159 | +} |
| 160 | + |
| 161 | +func (self *DialSdkChannel) Start(channel channel.MultiChannel) { |
| 162 | + self.constraints.Apply(channel, self) |
| 163 | +} |
| 164 | + |
| 165 | +func (self *DialSdkChannel) HandleUnderlayClose(ch channel.MultiChannel, underlay channel.Underlay) { |
| 166 | + pfxlog.Logger(). |
| 167 | + WithField("id", ch.Label()). |
| 168 | + WithField("underlays", ch.GetUnderlayCountsByType()). |
| 169 | + WithField("underlayType", channel.GetUnderlayType(underlay)). |
| 170 | + Info("underlay closed") |
| 171 | + self.UpdateCtrlChannelAvailable(ch) |
| 172 | + self.constraints.Apply(ch, self) |
| 173 | +} |
| 174 | + |
| 175 | +func (self *DialSdkChannel) DialFailed(_ channel.MultiChannel, _ string, attempt int) { |
| 176 | + delay := 2 * time.Duration(attempt) * time.Second |
| 177 | + if delay > time.Minute { |
| 178 | + delay = time.Minute |
| 179 | + } |
| 180 | + time.Sleep(delay) |
| 181 | +} |
| 182 | + |
| 183 | +func (self *DialSdkChannel) CreateGroupedUnderlay(groupId string, underlayType string, timeout time.Duration) (channel.Underlay, error) { |
| 184 | + return self.dialer.CreateWithHeaders(timeout, map[int32][]byte{ |
| 185 | + channel.TypeHeader: []byte(underlayType), |
| 186 | + channel.ConnectionIdHeader: []byte(groupId), |
| 187 | + channel.IsGroupedHeader: {1}, |
| 188 | + }) |
| 189 | +} |
| 190 | + |
| 191 | +func NewSingleSdkChannel(ch channel.Channel) SdkChannel { |
| 192 | + return &SingleSdkChannel{ |
| 193 | + ch: ch, |
| 194 | + } |
| 195 | +} |
| 196 | + |
| 197 | +type SingleSdkChannel struct { |
| 198 | + ch channel.Channel |
| 199 | +} |
| 200 | + |
| 201 | +func (self *SingleSdkChannel) InitChannel(channel.MultiChannel) { |
| 202 | +} |
| 203 | + |
| 204 | +func (self *SingleSdkChannel) GetChannel() channel.Channel { |
| 205 | + return self.ch |
| 206 | +} |
| 207 | + |
| 208 | +func (self *SingleSdkChannel) GetDefaultSender() channel.Sender { |
| 209 | + return self.ch |
| 210 | +} |
| 211 | + |
| 212 | +func (self *SingleSdkChannel) GetControlSender() channel.Sender { |
| 213 | + return self.ch |
| 214 | +} |
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