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fix(coderd): ensure agent WebSocket conn is cleaned up#19711
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DanielleMaywood merged 4 commits intomainfromdanielle/devcontainers/handle-websocket-conn-cleanupSep 5, 2025
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35a7440 fix(coderd): ensure agent WebSocket conn is cleaned up
DanielleMaywood5997a47 chore: rename the cancel functions
DanielleMaywoodc881ccb chore: move `Heartbeat` back to original position
DanielleMaywood1c4204c chore: move `context.WithCancel` call later
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13 changes: 8 additions & 5 deletionscoderd/workspaceagents.go
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137 changes: 136 additions & 1 deletioncoderd/workspaceagents_internal_test.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -59,10 +59,145 @@ func (fakeAgentProvider) Close() error { | ||
| return nil | ||
| } | ||
| type channelCloser struct { | ||
| closeFn func() | ||
| } | ||
| func (c *channelCloser) Close() error { | ||
| c.closeFn() | ||
| return nil | ||
| } | ||
| func TestWatchAgentContainers(t *testing.T) { | ||
| t.Parallel() | ||
| t.Run("CoderdWebSocketCanHandleClientClosing", func(t *testing.T) { | ||
| t.Parallel() | ||
| // This test ensures that the agent containers `/watch` websocket can gracefully | ||
| // handle the client websocket closing. This test was created in | ||
| // response to this issue: https://github.com/coder/coder/issues/19449 | ||
| var ( | ||
| ctx = testutil.Context(t, testutil.WaitLong) | ||
There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others.Learn more. Unfortunately this test uses There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others.Learn more. That's unfortunate 😔. Perhaps we should have a There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others.Learn more. I definitely agree although I think that is out-of-scope for this PR. Should we create an issue to track that? There was a problem hiding this comment. Choose a reason for hiding this commentThe reason will be displayed to describe this comment to others.Learn more. We could do something like typeHeartbeatOptionfunc(...)funcWithHeartbeatInterval(d time.Duration)HeartbeatOptionfuncHeartbeat(ctx context.Context,conn*websocket.Conn,opts...HeartbeatOption) {...} It might be worthwhile also unexporting | ||
| logger = slogtest.Make(t, &slogtest.Options{IgnoreErrors: true}).Leveled(slog.LevelDebug).Named("coderd") | ||
| mCtrl = gomock.NewController(t) | ||
| mDB = dbmock.NewMockStore(mCtrl) | ||
| mCoordinator = tailnettest.NewMockCoordinator(mCtrl) | ||
| mAgentConn = agentconnmock.NewMockAgentConn(mCtrl) | ||
| fAgentProvider = fakeAgentProvider{ | ||
| agentConn: func(ctx context.Context, agentID uuid.UUID) (_ workspacesdk.AgentConn, release func(), _ error) { | ||
| return mAgentConn, func() {}, nil | ||
| }, | ||
| } | ||
| workspaceID = uuid.New() | ||
| agentID = uuid.New() | ||
| resourceID = uuid.New() | ||
| jobID = uuid.New() | ||
| buildID = uuid.New() | ||
| containersCh = make(chan codersdk.WorkspaceAgentListContainersResponse) | ||
| r = chi.NewMux() | ||
| api = API{ | ||
| ctx: ctx, | ||
| Options: &Options{ | ||
| AgentInactiveDisconnectTimeout: testutil.WaitShort, | ||
| Database: mDB, | ||
| Logger: logger, | ||
| DeploymentValues: &codersdk.DeploymentValues{}, | ||
| TailnetCoordinator: tailnettest.NewFakeCoordinator(), | ||
| }, | ||
| } | ||
| ) | ||
| var tailnetCoordinator tailnet.Coordinator = mCoordinator | ||
| api.TailnetCoordinator.Store(&tailnetCoordinator) | ||
| api.agentProvider = fAgentProvider | ||
| // Setup: Allow `ExtractWorkspaceAgentParams` to complete. | ||
| mDB.EXPECT().GetWorkspaceAgentByID(gomock.Any(), agentID).Return(database.WorkspaceAgent{ | ||
| ID: agentID, | ||
| ResourceID: resourceID, | ||
| LifecycleState: database.WorkspaceAgentLifecycleStateReady, | ||
| FirstConnectedAt: sql.NullTime{Valid: true, Time: dbtime.Now()}, | ||
| LastConnectedAt: sql.NullTime{Valid: true, Time: dbtime.Now()}, | ||
| }, nil) | ||
| mDB.EXPECT().GetWorkspaceResourceByID(gomock.Any(), resourceID).Return(database.WorkspaceResource{ | ||
| ID: resourceID, | ||
| JobID: jobID, | ||
| }, nil) | ||
| mDB.EXPECT().GetProvisionerJobByID(gomock.Any(), jobID).Return(database.ProvisionerJob{ | ||
| ID: jobID, | ||
| Type: database.ProvisionerJobTypeWorkspaceBuild, | ||
| }, nil) | ||
| mDB.EXPECT().GetWorkspaceBuildByJobID(gomock.Any(), jobID).Return(database.WorkspaceBuild{ | ||
| WorkspaceID: workspaceID, | ||
| ID: buildID, | ||
| }, nil) | ||
| // And: Allow `db2dsk.WorkspaceAgent` to complete. | ||
| mCoordinator.EXPECT().Node(gomock.Any()).Return(nil) | ||
| // And: Allow `WatchContainers` to be called, returing our `containersCh` channel. | ||
| mAgentConn.EXPECT().WatchContainers(gomock.Any(), gomock.Any()). | ||
| DoAndReturn(func(_ context.Context, _ slog.Logger) (<-chan codersdk.WorkspaceAgentListContainersResponse, io.Closer, error) { | ||
| return containersCh, &channelCloser{closeFn: func() { | ||
| close(containersCh) | ||
| }}, nil | ||
| }) | ||
| // And: We mount the HTTP Handler | ||
| r.With(httpmw.ExtractWorkspaceAgentParam(mDB)). | ||
| Get("/workspaceagents/{workspaceagent}/containers/watch", api.watchWorkspaceAgentContainers) | ||
| // Given: We create the HTTP server | ||
| srv := httptest.NewServer(r) | ||
| defer srv.Close() | ||
| // And: Dial the WebSocket | ||
| wsURL := strings.Replace(srv.URL, "http://", "ws://", 1) | ||
| conn, resp, err := websocket.Dial(ctx, fmt.Sprintf("%s/workspaceagents/%s/containers/watch", wsURL, agentID), nil) | ||
| require.NoError(t, err) | ||
| if resp.Body != nil { | ||
| defer resp.Body.Close() | ||
| } | ||
| // And: Create a streaming decoder | ||
| decoder := wsjson.NewDecoder[codersdk.WorkspaceAgentListContainersResponse](conn, websocket.MessageText, logger) | ||
| defer decoder.Close() | ||
| decodeCh := decoder.Chan() | ||
| // And: We can successfully send through the channel. | ||
| testutil.RequireSend(ctx, t, containersCh, codersdk.WorkspaceAgentListContainersResponse{ | ||
| Containers: []codersdk.WorkspaceAgentContainer{{ | ||
| ID: "test-container-id", | ||
| }}, | ||
| }) | ||
| // And: Receive the data. | ||
| containerResp := testutil.RequireReceive(ctx, t, decodeCh) | ||
| require.Len(t, containerResp.Containers, 1) | ||
| require.Equal(t, "test-container-id", containerResp.Containers[0].ID) | ||
| // When: We close the WebSocket | ||
| conn.Close(websocket.StatusNormalClosure, "test closing connection") | ||
| // Then: We expect `containersCh` to be closed. | ||
| select { | ||
| case <-ctx.Done(): | ||
| t.Fail() | ||
| case _, ok := <-containersCh: | ||
| require.False(t, ok, "channel is expected to be closed") | ||
| } | ||
| }) | ||
| t.Run("CoderdWebSocketCanHandleAgentClosing", func(t *testing.T) { | ||
| t.Parallel() | ||
| // This test ensures that the agent containers `/watch` websocket can gracefully | ||
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