added interactive shell multistep-init

README.md

@@ -388,7 +388,11 @@ textboxes:
 </details>
 
 ### JMX
+
+<details><summary>Java application uptime</summary>
+
 Prerequisite: download [jmxterm jar file](https://docs.cyclopsgroup.org/jmxterm)
+
 ```yml
 textboxes:
   - title: Java application uptime
@@ -399,3 +403,5 @@ textboxes:
     sample: get Uptime
     transform: echo $sample | tr -dc '0-9' | awk '{printf "%.1f min", $1/1000/60}'
 ```
+
+</details>

config/component.go

@@ -107,6 +107,7 @@ type Item struct {
 	Color               *ui.Color `yaml:"color,omitempty"`
 	Pty                 *bool     `yaml:"pty,omitempty"`
 	InitScript          *string   `yaml:"init,omitempty"`
+	MultiStepInitScript *[]string `yaml:"multistep-init,omitempty"`
 	SampleScript        *string   `yaml:"sample"`
 	TransformScript     *string   `yaml:"transform,omitempty"`
 }

config/validator.go

@@ -12,31 +12,53 @@ func (c *Config) validate() {
 	for _, c := range c.RunCharts {
 		components = append(components, c.ComponentConfig)
 		validateLabelsUniqueness(c.Title, c.Items)
+		validateItemsScripts(c.Title, c.Items)
 	}
 	for _, c := range c.BarCharts {
 		components = append(components, c.ComponentConfig)
 		validateLabelsUniqueness(c.Title, c.Items)
+		validateItemsScripts(c.Title, c.Items)
 	}
 	for _, c := range c.SparkLines {
 		components = append(components, c.ComponentConfig)
+		validateItemScripts(c.Title, c.Item)
 	}
 	for _, c := range c.Gauges {
 		components = append(components, c.ComponentConfig)
+		validateItemScripts(c.Title, c.Min)
+		validateItemScripts(c.Title, c.Max)
+		validateItemScripts(c.Title, c.Cur)
 	}
 	for _, c := range c.AsciiBoxes {
 		components = append(components, c.ComponentConfig)
+		validateItemScripts(c.Title, c.Item)
 	}
 	for _, c := range c.TextBoxes {
 		components = append(components, c.ComponentConfig)
+		validateItemScripts(c.Title, c.Item)
 	}
 
 	validateTitlesUniqueness(components)
 }
 
+func validateItemsScripts(title string, items []Item) {
+	for _, i := range items {
+		if i.InitScript != nil && i.MultiStepInitScript != nil {
+			validateItemScripts(title, i)
+		}
+	}
+}
+
+func validateItemScripts(title string, i Item) {
+	if i.InitScript != nil && i.MultiStepInitScript != nil {
+		console.Exit(fmt.Sprintf("Config validation error: both init and multistep-init scripts are not allowed in '%s'", title))
+	}
+}
+
 func validateLabelsUniqueness(title string, items []Item) {
 	labels := make(map[string]bool)
-	for _, c := range items {
+	for _, i := range items {
-		label := *c.Label
+		label := *i.Label
 		if _, contains := labels[label]; contains {
 			console.Exit(fmt.Sprintf("Config validation error: item labels should be unique. Please rename '%s' in '%s'", label, title))
 		}

data/int_pty.go

@@ -13,7 +13,7 @@ import (
 )
 
 const (
-	startupTimeout  = 100 * time.Millisecond
+	startupTimeout  = 200 * time.Millisecond
 	minAwaitTimeout = 100 * time.Millisecond
 	maxAwaitTimeout = 1 * time.Second
 )
@@ -33,7 +33,7 @@ type PtyInteractiveShell struct {
 
 func (s *PtyInteractiveShell) init() error {
 
-	cmd := exec.Command("sh", "-c", *s.item.initScript)
+	cmd := exec.Command("sh", "-c", s.item.initScripts[0])
 	enrichEnvVariables(cmd, s.variables)
 
 	file, err := pty.Start(cmd)
@@ -61,6 +61,14 @@ func (s *PtyInteractiveShell) init() error {
 
 	time.Sleep(startupTimeout)
 
+	for i := 1; i < len(s.item.initScripts); i++ {
+		_, err = io.WriteString(s.file, fmt.Sprintf(" %s\n", s.item.initScripts[i]))
+		if err != nil {
+			return err
+		}
+		time.Sleep(startupTimeout) // TODO wait until cmd complete
+	}
+
 	return nil
 }
 

data/int_shell.go

@@ -23,7 +23,7 @@ type BasicInteractiveShell struct {
 
 func (s *BasicInteractiveShell) init() error {
 
-	cmd := exec.Command("sh", "-c", *s.item.initScript)
+	cmd := exec.Command("sh", "-c", s.item.initScripts[0])
 	enrichEnvVariables(cmd, s.variables)
 	cmd.Wait()
 
@@ -65,12 +65,20 @@ func (s *BasicInteractiveShell) init() error {
 		return err
 	}
 
+	for i := 1; i < len(s.item.initScripts); i++ {
+		_, err := io.WriteString(s.stdin, fmt.Sprintf(" %s\n", s.item.initScripts[i]))
+		if err != nil {
+			return err
+		}
+		time.Sleep(startupTimeout) // TODO wait until cmd complete
+	}
+
 	return nil
 }
 
 func (s *BasicInteractiveShell) execute() (string, error) {
 
-	_, err := io.WriteString(s.stdin, s.item.sampleScript+"\n")
+	_, err := io.WriteString(s.stdin, fmt.Sprintf(" %s\n", s.item.sampleScript))
 	if err != nil {
 		s.errCount++
 		if s.errCount > errorThreshold {

data/item.go

@@ -12,8 +12,8 @@ const errorThreshold = 10
 
 type Item struct {
 	label           string
+	initScripts     []string
 	sampleScript    string
-	initScript      *string
 	transformScript *string
 	color           *ui.Color
 	rateMs          int
@@ -30,7 +30,7 @@ func NewItems(cfgs []config.Item, rateMs int) []*Item {
 		item := &Item{
 			label:           *i.Label,
 			sampleScript:    *i.SampleScript,
-			initScript:      i.InitScript,
+			initScripts:     getInitScripts(i),
 			transformScript: i.TransformScript,
 			color:           i.Color,
 			rateMs:          rateMs,
@@ -43,7 +43,7 @@ func NewItems(cfgs []config.Item, rateMs int) []*Item {
 
 func (i *Item) nextValue(variables []string) (string, error) {
 
-	if i.initScript != nil && i.basicShell == nil && i.ptyShell == nil {
+	if len(i.initScripts) > 0 && i.basicShell == nil && i.ptyShell == nil {
 		err := i.initInteractiveShell(variables)
 		if err != nil {
 			return "", err
@@ -99,3 +99,13 @@ func enrichEnvVariables(cmd *exec.Cmd, variables []string) {
 		cmd.Env = append(cmd.Env, variable)
 	}
 }
+
+func getInitScripts(item config.Item) []string {
+	if item.MultiStepInitScript != nil {
+		return *item.MultiStepInitScript
+	} else if item.InitScript != nil {
+		return []string{*item.InitScript}
+	} else {
+		return []string{}
+	}
+}