allow setting maximum duration on the graph

pkg/commands/container.go

@@ -39,6 +39,7 @@ type Container struct {
 type RecordedStats struct {
 	ClientStats  ContainerStats
 	DerivedStats DerivedStats
+	RecordedAt   time.Time
 }
 
 type DerivedStats struct {
@@ -353,3 +354,18 @@ func (c *Container) Attach() (*exec.Cmd, error) {
 func (c *Container) Top() (types.ContainerProcessList, error) {
 	return c.Client.ContainerTop(context.Background(), c.ID, []string{})
 }
+
+// EraseOldHistory removes any history before the user-specified max duration
+func (c *Container) EraseOldHistory() {
+	c.Log.Warn(c.Config.UserConfig.Stats.MaxDuration)
+	if c.Config.UserConfig.Stats.MaxDuration == 0 {
+		return
+	}
+
+	for i, stat := range c.StatHistory {
+		if time.Since(stat.RecordedAt) < c.Config.UserConfig.Stats.MaxDuration {
+			c.StatHistory = c.StatHistory[i:]
+			return
+		}
+	}
+}

pkg/commands/container_stats.go

@@ -197,15 +197,38 @@ func (c *Container) RenderStats(viewWidth int) (string, error) {
 // PlotGraph returns the plotted graph based on the graph spec and the stat history
 func (c *Container) PlotGraph(spec config.GraphConfig, width int) (string, error) {
 	data := make([]float64, len(c.StatHistory))
+
+	max := spec.Max
+	min := spec.Min
 	for i, stats := range c.StatHistory {
 		value, err := lookup.LookupString(stats, spec.StatPath)
 		if err != nil {
-			return "", err
+			return "Could not find key: " + spec.StatPath, nil
 		}
 		floatValue, err := getFloat(value.Interface())
 		if err != nil {
 			return "", err
 		}
+		if spec.MinType == "" {
+			if i == 0 {
+				min = floatValue
+			} else {
+				if floatValue < min {
+					min = floatValue
+				}
+			}
+		}
+
+		if spec.MaxType == "" {
+			if i == 0 {
+				max = floatValue
+			} else {
+				if floatValue > max {
+					max = floatValue
+				}
+			}
+		}
+
 		data[i] = floatValue
 	}
 
@@ -213,8 +236,8 @@ func (c *Container) PlotGraph(spec config.GraphConfig, width int) (string, error
 		data,
 		asciigraph.Height(spec.Height),
 		asciigraph.Width(width),
-		asciigraph.Min(spec.Min),
-		asciigraph.Max(spec.Max),
+		asciigraph.Min(min),
+		asciigraph.Max(max),
 		asciigraph.Caption(spec.Caption),
 	), nil
 }

pkg/commands/docker.go

@@ -130,11 +130,12 @@ func (c *DockerCommand) createClientStatMonitor(container *Container) {
 				CPUPercentage:    stats.CalculateContainerCPUPercentage(),
 				MemoryPercentage: stats.CalculateContainerMemoryUsage(),
 			},
+			RecordedAt: time.Now(),
 		}
 
 		c.ContainerMutex.Lock()
-		// TODO: for now we never truncate the recorded stats, and we should
 		container.StatHistory = append(container.StatHistory, recordedStats)
+		container.EraseOldHistory()
 		c.ContainerMutex.Unlock()
 	}
 

pkg/config/app_config.go

@@ -3,6 +3,7 @@ package config
 import (
 	"io/ioutil"
 	"path/filepath"
+	"time"
 
 	"github.com/shibukawa/configdir"
 	yaml "gopkg.in/yaml.v2"
@@ -123,10 +124,14 @@ type GraphConfig struct {
 	Caption  string  `yaml:"caption,omitempty"`
 	StatPath string  `yaml:"statPath,omitempty"`
 	Color    string  `yaml:"color,omitempty"`
+	// MinType and MaxType are each one of "", "static". blank means the min/max of the data set will be used. "static" means the min/max specified will be used
+	MinType string `yaml:"minType,omitempty"`
+	MaxType string `yaml:"maxType,omitempty"`
 }
 
 type StatsConfig struct {
-	Graphs []GraphConfig
+	Graphs      []GraphConfig
+	MaxDuration time.Duration `yaml:"maxDuration,omitempty"`
 }
 
 // GetDefaultConfig returns the application default configuration

pkg/gui/containers_panel.go

@@ -122,6 +122,7 @@ func (gui *Gui) renderContainerConfig(mainView *gocui.View, container *commands.
 func (gui *Gui) renderContainerStats(mainView *gocui.View, container *commands.Container) error {
 	mainView.Autoscroll = false
 	mainView.Title = "Stats"
+	mainView.Wrap = false
 
 	return gui.T.NewTickerTask(time.Second, func() {
 		width, _ := mainView.Size()