|
| 1 | +package show |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "encoding/json" |
| 6 | + |
| 7 | + "io" |
| 8 | + "time" |
| 9 | + |
| 10 | + "github.com/spf13/cobra" |
| 11 | + |
| 12 | + "github.com/docker/cli/cli/command/container" |
| 13 | + "github.com/docker/docker/api/types" |
| 14 | + sdkClient "github.com/docker/docker/client" |
| 15 | + "github.com/pterm/pterm" |
| 16 | + "github.com/zakisk/dock-stats/pkg/logger" |
| 17 | + "github.com/zakisk/dock-stats/pkg/utils" |
| 18 | + "github.com/zakisk/drawille-go" |
| 19 | +) |
| 20 | + |
| 21 | +type Attribute int |
| 22 | + |
| 23 | +const escape = "\x1b" |
| 24 | + |
| 25 | +// rootCmd represents the base command when called without any subcommands |
| 26 | +var ShowCmd = &cobra.Command{ |
| 27 | + Use: "show", |
| 28 | + Short: "Shows containers stats", |
| 29 | + Long: `Command to render container real-time stats |
| 30 | +Usage: dock-stats show [CONTAINER] |
| 31 | +
|
| 32 | +Example: dock-stats show ubuntu |
| 33 | +`, |
| 34 | + Run: func(cmd *cobra.Command, args []string) { |
| 35 | + log := logger.NewLog() |
| 36 | + if len(args) == 0 { |
| 37 | + log.Fatal("Please specify container name", log.Args()) |
| 38 | + } |
| 39 | + |
| 40 | + confirm := pterm.DefaultInteractiveConfirm. |
| 41 | + WithDefaultText("Before showing stats, It will clear your terminal, Do you agree?") |
| 42 | + result, _ := confirm.Show() |
| 43 | + if !result { |
| 44 | + return |
| 45 | + } |
| 46 | + |
| 47 | + client, err := sdkClient.NewClientWithOpts(sdkClient.FromEnv, sdkClient.WithAPIVersionNegotiation()) |
| 48 | + if err != nil { |
| 49 | + log.Fatal("Error while creating docker client", log.Args("error", err)) |
| 50 | + } |
| 51 | + statsResponse, err := client.ContainerStats(context.Background(), args[0], true) |
| 52 | + if err != nil { |
| 53 | + log.Fatal("Error while getting container stats", log.Args("error", err)) |
| 54 | + } |
| 55 | + defer statsResponse.Body.Close() |
| 56 | + |
| 57 | + statChan, errChan := getStats(log, statsResponse) |
| 58 | + |
| 59 | + canvas := drawille.NewCanvas(103, 30) |
| 60 | + canvas.LineColors = []drawille.Color{ |
| 61 | + drawille.DarkCyan, // cpu |
| 62 | + drawille.Yellow, // memory |
| 63 | + } |
| 64 | + canvas.LabelColor = drawille.Crimson |
| 65 | + canvas.AxisColor = drawille.DarkOrchid |
| 66 | + canvas.NumDataPoints = 50 |
| 67 | + canvas.HorizontalLabels = []string{} |
| 68 | + formatter := NewFormatter(statsResponse.OSType) |
| 69 | + |
| 70 | + for { |
| 71 | + select { |
| 72 | + case stats := <-statChan: |
| 73 | + { |
| 74 | + formatter.setStats(stats) |
| 75 | + formatter.Plot(canvas) |
| 76 | + } |
| 77 | + case err := <-errChan: |
| 78 | + { |
| 79 | + if err != nil { |
| 80 | + log.Error(err.Error(), log.Args()) |
| 81 | + if err == io.EOF { |
| 82 | + break |
| 83 | + } |
| 84 | + } |
| 85 | + } |
| 86 | + } |
| 87 | + } |
| 88 | + }, |
| 89 | +} |
| 90 | + |
| 91 | +func getStats(log *logger.Log, statsResponse types.ContainerStats) (chan *StatsItem, chan error) { |
| 92 | + statChan := make(chan *StatsItem) |
| 93 | + errChan := make(chan error) |
| 94 | + var ( |
| 95 | + previousCPU uint64 |
| 96 | + previousSystem uint64 |
| 97 | + ) |
| 98 | + |
| 99 | + dec := json.NewDecoder(statsResponse.Body) |
| 100 | + go func() { |
| 101 | + for { |
| 102 | + var ( |
| 103 | + stats *types.StatsJSON |
| 104 | + memPercent, cpuPercent float64 |
| 105 | + blkRead, blkWrite uint64 |
| 106 | + mem, memLimit float64 |
| 107 | + pidsStatsCurrent uint64 |
| 108 | + ) |
| 109 | + if err := dec.Decode(&stats); err != nil { |
| 110 | + dec = json.NewDecoder(io.MultiReader(dec.Buffered(), statsResponse.Body)) |
| 111 | + errChan <- err |
| 112 | + if err == io.EOF { |
| 113 | + statsResponse.Body.Close() |
| 114 | + close(statChan) |
| 115 | + close(errChan) |
| 116 | + break |
| 117 | + } |
| 118 | + time.Sleep(100 * time.Millisecond) |
| 119 | + continue |
| 120 | + } |
| 121 | + |
| 122 | + daemonOSType := statsResponse.OSType |
| 123 | + |
| 124 | + // all these values are evaluated using copied code from docker's source |
| 125 | + // values showed in this app's output are exactly same as docker gives in `docker stats` command. |
| 126 | + if daemonOSType != "windows" { |
| 127 | + previousCPU = stats.PreCPUStats.CPUUsage.TotalUsage |
| 128 | + previousSystem = stats.PreCPUStats.SystemUsage |
| 129 | + cpuPercent = utils.CalculateCPUPercentUnix(previousCPU, previousSystem, stats) |
| 130 | + blkRead, blkWrite = utils.CalculateBlockIO(stats.BlkioStats) |
| 131 | + mem = utils.CalculateMemUsageUnixNoCache(stats.MemoryStats) |
| 132 | + memLimit = float64(stats.MemoryStats.Limit) |
| 133 | + memPercent = utils.CalculateMemPercentUnixNoCache(memLimit, mem) |
| 134 | + pidsStatsCurrent = stats.PidsStats.Current |
| 135 | + } else { |
| 136 | + cpuPercent = utils.CalculateCPUPercentWindows(stats) |
| 137 | + blkRead = stats.StorageStats.ReadSizeBytes |
| 138 | + blkWrite = stats.StorageStats.WriteSizeBytes |
| 139 | + mem = float64(stats.MemoryStats.PrivateWorkingSet) |
| 140 | + } |
| 141 | + netRx, netTx := utils.CalculateNetwork(stats.Networks) |
| 142 | + |
| 143 | + statsItem := &StatsItem{ |
| 144 | + StatsEntry: container.StatsEntry{ |
| 145 | + Name: stats.Name, |
| 146 | + ID: stats.ID, |
| 147 | + CPUPercentage: cpuPercent, |
| 148 | + Memory: mem, |
| 149 | + MemoryPercentage: memPercent, |
| 150 | + MemoryLimit: memLimit, |
| 151 | + NetworkRx: netRx, |
| 152 | + NetworkTx: netTx, |
| 153 | + BlockRead: float64(blkRead), |
| 154 | + BlockWrite: float64(blkWrite), |
| 155 | + PidsCurrent: pidsStatsCurrent, |
| 156 | + }, |
| 157 | + daemonOSType: daemonOSType, |
| 158 | + } |
| 159 | + statChan <- statsItem |
| 160 | + } |
| 161 | + }() |
| 162 | + return statChan, errChan |
| 163 | +} |
| 164 | + |
| 165 | +func addElement(arr []float64, el float64) []float64 { |
| 166 | + arr = append([]float64{el}, arr...) |
| 167 | + if len(arr) > 10 { |
| 168 | + arr = arr[:10] |
| 169 | + } |
| 170 | + return arr |
| 171 | +} |
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