expand container monitoring functionality (#928)

- Add new /containers route with virtualized table showing all containers across systems
- Implement container stats collection (CPU, memory, network usage) with health status tracking
- Add container logs and info API endpoints with syntax highlighting using Shiki
- Create detailed container views with fullscreen logs/info dialogs and refresh functionality
- Add container table to individual system pages with lazy loading
- Implement container record storage with automatic cleanup and historical averaging
- Update navbar with container navigation icon
- Extract reusable ActiveAlerts component from home page
- Add FooterRepoLink component for consistent GitHub/version display
- Enhance filtering and search capabilities across container tables

agent/client.go

@@ -271,6 +271,8 @@ func (client *WebSocketClient) sendResponse(data any, requestID *uint32) error {
 			response.SystemData = v
 		case *common.FingerprintResponse:
 			response.Fingerprint = v
+		case string:
+			response.String = &v
 		// case []byte:
 		// 	response.RawBytes = v
 		// case string:

agent/docker.go

@@ -3,8 +3,11 @@ package agent
 import (
 	"bytes"
 	"context"
+	"encoding/binary"
 	"encoding/json"
+	"errors"
 	"fmt"
+	"io"
 	"log/slog"
 	"net"
 	"net/http"
@@ -27,6 +30,8 @@ const (
 	maxNetworkSpeedBps uint64 = 5e9
 	// Maximum conceivable memory usage of a container (100TB) to detect bad memory stats
 	maxMemoryUsage uint64 = 100 * 1024 * 1024 * 1024 * 1024
+	// Number of log lines to request when fetching container logs
+	dockerLogsTail = 200
 )
 
 type dockerManager struct {
@@ -301,11 +306,46 @@ func updateContainerStatsValues(stats *container.Stats, cpuPct float64, usedMemo
 	stats.PrevReadTime = readTime
 }
 
+func parseDockerStatus(status string) (string, container.DockerHealth) {
+	trimmed := strings.TrimSpace(status)
+	if trimmed == "" {
+		return "", container.DockerHealthNone
+	}
+
+	// Remove "About " from status
+	trimmed = strings.Replace(trimmed, "About ", "", 1)
+
+	openIdx := strings.LastIndex(trimmed, "(")
+	if openIdx == -1 || !strings.HasSuffix(trimmed, ")") {
+		return trimmed, container.DockerHealthNone
+	}
+
+	statusText := strings.TrimSpace(trimmed[:openIdx])
+	if statusText == "" {
+		statusText = trimmed
+	}
+
+	healthText := strings.ToLower(strings.TrimSpace(strings.TrimSuffix(trimmed[openIdx+1:], ")")))
+	// Some Docker statuses include a "health:" prefix inside the parentheses.
+	// Strip it so it maps correctly to the known health states.
+	if colonIdx := strings.IndexRune(healthText, ':'); colonIdx != -1 {
+		prefix := strings.TrimSpace(healthText[:colonIdx])
+		if prefix == "health" || prefix == "health status" {
+			healthText = strings.TrimSpace(healthText[colonIdx+1:])
+		}
+	}
+	if health, ok := container.DockerHealthStrings[healthText]; ok {
+		return statusText, health
+	}
+
+	return trimmed, container.DockerHealthNone
+}
+
 // Updates stats for individual container with cache-time-aware delta tracking
 func (dm *dockerManager) updateContainerStats(ctr *container.ApiInfo, cacheTimeMs uint16) error {
 	name := ctr.Names[0][1:]
 
-	resp, err := dm.client.Get("http://localhost/containers/" + ctr.IdShort + "/stats?stream=0&one-shot=1")
+	resp, err := dm.client.Get(fmt.Sprintf("http://localhost/containers/%s/stats?stream=0&one-shot=1", ctr.IdShort))
 	if err != nil {
 		return err
 	}
@@ -316,10 +356,16 @@ func (dm *dockerManager) updateContainerStats(ctr *container.ApiInfo, cacheTimeM
 	// add empty values if they doesn't exist in map
 	stats, initialized := dm.containerStatsMap[ctr.IdShort]
 	if !initialized {
-		stats = &container.Stats{Name: name}
+		stats = &container.Stats{Name: name, Id: ctr.IdShort}
 		dm.containerStatsMap[ctr.IdShort] = stats
 	}
 
+	stats.Id = ctr.IdShort
+
+	statusText, health := parseDockerStatus(ctr.Status)
+	stats.Status = statusText
+	stats.Health = health
+
 	// reset current stats
 	stats.Cpu = 0
 	stats.Mem = 0
@@ -548,3 +594,103 @@ func getDockerHost() string {
 	}
 	return scheme + socks[0]
 }
+
+// getContainerInfo fetches the inspection data for a container
+func (dm *dockerManager) getContainerInfo(ctx context.Context, containerID string) (string, error) {
+	endpoint := fmt.Sprintf("http://localhost/containers/%s/json", containerID)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return "", err
+	}
+
+	resp, err := dm.client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+		return "", fmt.Errorf("container info request failed: %s: %s", resp.Status, strings.TrimSpace(string(body)))
+	}
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return "", err
+	}
+
+	return string(data), nil
+}
+
+// getLogs fetches the logs for a container
+func (dm *dockerManager) getLogs(ctx context.Context, containerID string) (string, error) {
+	endpoint := fmt.Sprintf("http://localhost/containers/%s/logs?stdout=1&stderr=1&tail=%d", containerID, dockerLogsTail)
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return "", err
+	}
+
+	resp, err := dm.client.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(io.LimitReader(resp.Body, 1024))
+		return "", fmt.Errorf("logs request failed: %s: %s", resp.Status, strings.TrimSpace(string(body)))
+	}
+
+	var builder strings.Builder
+	if err := decodeDockerLogStream(resp.Body, &builder); err != nil {
+		return "", err
+	}
+
+	return builder.String(), nil
+}
+
+func decodeDockerLogStream(reader io.Reader, builder *strings.Builder) error {
+	const headerSize = 8
+	var header [headerSize]byte
+	buf := make([]byte, 0, dockerLogsTail*200)
+
+	for {
+		if _, err := io.ReadFull(reader, header[:]); err != nil {
+			if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
+				return nil
+			}
+			return err
+		}
+
+		frameLen := binary.BigEndian.Uint32(header[4:])
+		if frameLen == 0 {
+			continue
+		}
+
+		buf = allocateBuffer(buf, int(frameLen))
+		if _, err := io.ReadFull(reader, buf[:frameLen]); err != nil {
+			if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) {
+				if len(buf) > 0 {
+					builder.Write(buf[:min(int(frameLen), len(buf))])
+				}
+				return nil
+			}
+			return err
+		}
+		builder.Write(buf[:frameLen])
+	}
+}
+
+func allocateBuffer(current []byte, needed int) []byte {
+	if cap(current) >= needed {
+		return current[:needed]
+	}
+	return make([]byte, needed)
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}

agent/docker_test.go

@@ -858,6 +858,54 @@ func TestDeltaTrackerCacheTimeIsolation(t *testing.T) {
 	assert.Equal(t, uint64(200000), recvTracker2.Delta(ctr.IdShort))
 }
 
+func TestParseDockerStatus(t *testing.T) {
+	tests := []struct {
+		name           string
+		input          string
+		expectedStatus string
+		expectedHealth container.DockerHealth
+	}{
+		{
+			name:           "status with About an removed",
+			input:          "Up About an hour (healthy)",
+			expectedStatus: "Up an hour",
+			expectedHealth: container.DockerHealthHealthy,
+		},
+		{
+			name:           "status without About an unchanged",
+			input:          "Up 2 hours (healthy)",
+			expectedStatus: "Up 2 hours",
+			expectedHealth: container.DockerHealthHealthy,
+		},
+		{
+			name:           "status with About and no parentheses",
+			input:          "Up About an hour",
+			expectedStatus: "Up an hour",
+			expectedHealth: container.DockerHealthNone,
+		},
+		{
+			name:           "status without parentheses",
+			input:          "Created",
+			expectedStatus: "Created",
+			expectedHealth: container.DockerHealthNone,
+		},
+		{
+			name:           "empty status",
+			input:          "",
+			expectedStatus: "",
+			expectedHealth: container.DockerHealthNone,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			status, health := parseDockerStatus(tt.input)
+			assert.Equal(t, tt.expectedStatus, status)
+			assert.Equal(t, tt.expectedHealth, health)
+		})
+	}
+}
+
 func TestConstantsAndUtilityFunctions(t *testing.T) {
 	// Test constants are properly defined
 	assert.Equal(t, uint16(60000), defaultCacheTimeMs)

agent/handlers.go

@@ -1,6 +1,7 @@
 package agent
 
 import (
+	"context"
 	"errors"
 	"fmt"
 
@@ -43,6 +44,8 @@ func NewHandlerRegistry() *HandlerRegistry {
 
 	registry.Register(common.GetData, &GetDataHandler{})
 	registry.Register(common.CheckFingerprint, &CheckFingerprintHandler{})
+	registry.Register(common.GetContainerLogs, &GetContainerLogsHandler{})
+	registry.Register(common.GetContainerInfo, &GetContainerInfoHandler{})
 
 	return registry
 }
@@ -99,3 +102,53 @@ type CheckFingerprintHandler struct{}
 func (h *CheckFingerprintHandler) Handle(hctx *HandlerContext) error {
 	return hctx.Client.handleAuthChallenge(hctx.Request, hctx.RequestID)
 }
+
+////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////
+
+// GetContainerLogsHandler handles container log requests
+type GetContainerLogsHandler struct{}
+
+func (h *GetContainerLogsHandler) Handle(hctx *HandlerContext) error {
+	if hctx.Agent.dockerManager == nil {
+		return hctx.SendResponse("", hctx.RequestID)
+	}
+
+	var req common.ContainerLogsRequest
+	if err := cbor.Unmarshal(hctx.Request.Data, &req); err != nil {
+		return err
+	}
+
+	ctx := context.Background()
+	logContent, err := hctx.Agent.dockerManager.getLogs(ctx, req.ContainerID)
+	if err != nil {
+		return err
+	}
+
+	return hctx.SendResponse(logContent, hctx.RequestID)
+}
+
+////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////
+
+// GetContainerInfoHandler handles container info requests
+type GetContainerInfoHandler struct{}
+
+func (h *GetContainerInfoHandler) Handle(hctx *HandlerContext) error {
+	if hctx.Agent.dockerManager == nil {
+		return hctx.SendResponse("", hctx.RequestID)
+	}
+
+	var req common.ContainerInfoRequest
+	if err := cbor.Unmarshal(hctx.Request.Data, &req); err != nil {
+		return err
+	}
+
+	ctx := context.Background()
+	info, err := hctx.Agent.dockerManager.getContainerInfo(ctx, req.ContainerID)
+	if err != nil {
+		return err
+	}
+
+	return hctx.SendResponse(info, hctx.RequestID)
+}

agent/server.go

@@ -168,6 +168,8 @@ func (a *Agent) handleSSHRequest(w io.Writer, req *common.HubRequest[cbor.RawMes
 		switch v := data.(type) {
 		case *system.CombinedData:
 			response.SystemData = v
+		case string:
+			response.String = &v
 		default:
 			response.Error = fmt.Sprintf("unsupported response type: %T", data)
 		}