|
| 1 | +package proxy |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "io" |
| 6 | + "sync" |
| 7 | + "sync/atomic" |
| 8 | + "time" |
| 9 | + |
| 10 | + "go.temporal.io/api/serviceerror" |
| 11 | + "go.temporal.io/server/api/adminservice/v1" |
| 12 | + "go.temporal.io/server/common/channel" |
| 13 | + "go.temporal.io/server/common/log" |
| 14 | + "go.temporal.io/server/common/log/tag" |
| 15 | + |
| 16 | + "github.com/temporalio/s2s-proxy/metrics" |
| 17 | +) |
| 18 | + |
| 19 | +type StreamRequestOrResponse interface { |
| 20 | + adminservice.StreamWorkflowReplicationMessagesRequest | adminservice.StreamWorkflowReplicationMessagesResponse |
| 21 | +} |
| 22 | +type ValueWithError[T StreamRequestOrResponse] struct { |
| 23 | + val *T |
| 24 | + err error |
| 25 | +} |
| 26 | +type recvable[T StreamRequestOrResponse] interface { |
| 27 | + Recv() (*T, error) |
| 28 | +} |
| 29 | + |
| 30 | +// startListener creates a channel of Recv() from the provided source. It is the job of the caller to cancel the context |
| 31 | +// that will stop Recv(), or the goroutine created by this will block forever |
| 32 | +func startListener[T StreamRequestOrResponse]( |
| 33 | + receiver recvable[T], |
| 34 | + shutdownChan channel.ShutdownOnce, |
| 35 | +) chan ValueWithError[T] { |
| 36 | + targetStreamServerData := make(chan ValueWithError[T]) |
| 37 | + go func() { |
| 38 | + for !shutdownChan.IsShutdown() { |
| 39 | + req, err := receiver.Recv() |
| 40 | + targetStreamServerData <- ValueWithError[T]{val: req, err: err} |
| 41 | + } |
| 42 | + }() |
| 43 | + return targetStreamServerData |
| 44 | +} |
| 45 | + |
| 46 | +func transferSourceToTarget( |
| 47 | + sourceStreamClient adminservice.AdminService_StreamWorkflowReplicationMessagesClient, |
| 48 | + targetStreamServer adminservice.AdminService_StreamWorkflowReplicationMessagesServer, |
| 49 | + wg *sync.WaitGroup, |
| 50 | + shutdownChan channel.ShutdownOnce, |
| 51 | + sendEOFToServer *atomic.Bool, |
| 52 | + directionLabel string, |
| 53 | + logger log.Logger, |
| 54 | +) { |
| 55 | + defer func() { |
| 56 | + logger.Debug("Shutdown sourceStreamClient.Recv loop.") |
| 57 | + shutdownChan.Shutdown() |
| 58 | + wg.Done() |
| 59 | + }() |
| 60 | + |
| 61 | + dataChan := startListener(sourceStreamClient, shutdownChan) |
| 62 | + |
| 63 | + for { |
| 64 | + var resp *adminservice.StreamWorkflowReplicationMessagesResponse |
| 65 | + var err error |
| 66 | + select { |
| 67 | + case <-shutdownChan.Channel(): |
| 68 | + return |
| 69 | + case dataWithError := <-dataChan: |
| 70 | + resp = dataWithError.val |
| 71 | + err = dataWithError.err |
| 72 | + } |
| 73 | + if err == io.EOF { |
| 74 | + logger.Debug("sourceStreamClient.Recv encountered EOF", tag.Error(err)) |
| 75 | + metrics.AdminServiceStreamTerminatedCount.WithLabelValues(directionLabel, "source").Inc() |
| 76 | + sendEOFToServer.Store(true) |
| 77 | + return |
| 78 | + } |
| 79 | + |
| 80 | + if err != nil { |
| 81 | + logger.Error("sourceStreamClient.Recv encountered error", tag.Error(err)) |
| 82 | + sendEOFToServer.Store(true) |
| 83 | + return |
| 84 | + } |
| 85 | + switch attr := resp.GetAttributes().(type) { |
| 86 | + case *adminservice.StreamWorkflowReplicationMessagesResponse_Messages: |
| 87 | + logger.Debug(fmt.Sprintf("forwarding ReplicationMessages: exclusive %v", attr.Messages.ExclusiveHighWatermark)) |
| 88 | + if err = targetStreamServer.Send(resp); err != nil { |
| 89 | + if err != io.EOF { |
| 90 | + logger.Error("targetStreamServer.Send encountered error", tag.Error(err)) |
| 91 | + } else { |
| 92 | + logger.Debug("targetStreamServer.Send encountered EOF", tag.Error(err)) |
| 93 | + metrics.AdminServiceStreamTerminatedCount.WithLabelValues(directionLabel, "target").Inc() |
| 94 | + } |
| 95 | + sendEOFToServer.Store(true) |
| 96 | + return |
| 97 | + } |
| 98 | + metrics.AdminServiceStreamReqCount.WithLabelValues(directionLabel).Inc() |
| 99 | + default: |
| 100 | + logger.Error("sourceStreamClient.Recv encountered error", tag.Error(serviceerror.NewInternal(fmt.Sprintf( |
| 101 | + "StreamWorkflowReplicationMessages encountered unknown type: %T %v", attr, attr, |
| 102 | + )))) |
| 103 | + sendEOFToServer.Store(true) |
| 104 | + return |
| 105 | + } |
| 106 | + } |
| 107 | +} |
| 108 | + |
| 109 | +func transferTargetToSource( |
| 110 | + sourceStreamClient adminservice.AdminService_StreamWorkflowReplicationMessagesClient, |
| 111 | + targetStreamServer adminservice.AdminService_StreamWorkflowReplicationMessagesServer, |
| 112 | + wg *sync.WaitGroup, |
| 113 | + shutdownChan channel.ShutdownOnce, |
| 114 | + sendEOFToServer *atomic.Bool, |
| 115 | + directionLabel string, |
| 116 | + logger log.Logger, |
| 117 | +) { |
| 118 | + defer func() { |
| 119 | + logger.Debug("Shutdown targetStreamServer.Recv loop.") |
| 120 | + shutdownChan.Shutdown() |
| 121 | + var err error |
| 122 | + closeSent := make(chan struct{}) |
| 123 | + go func() { |
| 124 | + err = sourceStreamClient.CloseSend() |
| 125 | + closeSent <- struct{}{} |
| 126 | + }() |
| 127 | + timeout := time.After(time.Second) |
| 128 | + select { |
| 129 | + case <-closeSent: |
| 130 | + break |
| 131 | + case <-timeout: |
| 132 | + err = fmt.Errorf("timed out waiting for source stream to close") |
| 133 | + } |
| 134 | + |
| 135 | + if err != nil { |
| 136 | + logger.Error("Failed to close sourceStreamClient", tag.Error(err)) |
| 137 | + } |
| 138 | + wg.Done() |
| 139 | + }() |
| 140 | + |
| 141 | + dataChan := startListener(targetStreamServer, shutdownChan) |
| 142 | + |
| 143 | + for { |
| 144 | + var req *adminservice.StreamWorkflowReplicationMessagesRequest |
| 145 | + var err error |
| 146 | + select { |
| 147 | + case <-shutdownChan.Channel(): |
| 148 | + return |
| 149 | + case valueWithError := <-dataChan: |
| 150 | + req = valueWithError.val |
| 151 | + err = valueWithError.err |
| 152 | + } |
| 153 | + if err == io.EOF { |
| 154 | + logger.Debug("targetStreamServer.Recv encountered EOF", tag.Error(err)) |
| 155 | + metrics.AdminServiceStreamTerminatedCount.WithLabelValues(directionLabel, "target").Inc() |
| 156 | + sendEOFToServer.Store(true) |
| 157 | + return |
| 158 | + } |
| 159 | + |
| 160 | + if err != nil { |
| 161 | + logger.Error("targetStreamServer.Recv encountered error", tag.Error(err)) |
| 162 | + return |
| 163 | + } |
| 164 | + |
| 165 | + switch attr := req.GetAttributes().(type) { |
| 166 | + case *adminservice.StreamWorkflowReplicationMessagesRequest_SyncReplicationState: |
| 167 | + logger.Debug(fmt.Sprintf("forwarding SyncReplicationState: inclusive %v", attr.SyncReplicationState.InclusiveLowWatermark)) |
| 168 | + if err = sourceStreamClient.Send(req); err != nil { |
| 169 | + if err != io.EOF { |
| 170 | + logger.Error("sourceStreamClient.Send encountered error", tag.Error(err)) |
| 171 | + } else { |
| 172 | + logger.Debug("sourceStreamClient.Send encountered EOF", tag.Error(err)) |
| 173 | + metrics.AdminServiceStreamTerminatedCount.WithLabelValues(directionLabel, "source").Inc() |
| 174 | + } |
| 175 | + sendEOFToServer.Store(true) |
| 176 | + return |
| 177 | + } |
| 178 | + metrics.AdminServiceStreamRespCount.WithLabelValues(directionLabel).Inc() |
| 179 | + default: |
| 180 | + logger.Error("targetStreamServer.Recv encountered error", tag.Error(serviceerror.NewInternal(fmt.Sprintf( |
| 181 | + "StreamWorkflowReplicationMessages encountered unknown type: %T %v", attr, attr, |
| 182 | + )))) |
| 183 | + sendEOFToServer.Store(true) |
| 184 | + return |
| 185 | + } |
| 186 | + } |
| 187 | +} |
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