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app_instance_table.go
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/
app_instance_table.go
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package helpers
import (
"regexp"
"strings"
)
// AppInstanceRow represents an instance of a V3 app's process,
// as displayed in the 'cf app' output.
type AppInstanceRow struct {
Index string
State string
Since string
CPU string
Memory string
Disk string
Details string
}
// AppProcessTable represents a process of a V3 app, as displayed in the 'cf
// app' output.
type AppProcessTable struct {
Type string
Sidecars string
InstanceCount string
MemUsage string
Instances []AppInstanceRow
}
// AppTable represents a V3 app as a collection of processes,
// as displayed in the 'cf app' output.
type AppTable struct {
Processes []AppProcessTable
}
// ParseV3AppProcessTable parses bytes from 'cf app' stdout into an AppTable.
func ParseV3AppProcessTable(input []byte) AppTable {
appTable := AppTable{}
rows := strings.Split(string(input), "\n")
foundFirstProcess := false
for _, row := range rows {
if !foundFirstProcess {
ok := regexp.MustCompile(`\Atype:([^:]+)\z`).Match([]byte(row))
if ok {
foundFirstProcess = true
} else {
continue
}
}
if row == "" {
continue
}
switch {
case strings.HasPrefix(row, "#"):
// instance row
columns := splitColumns(row)
details := ""
if len(columns) >= 7 {
details = columns[6]
}
instanceRow := AppInstanceRow{
Index: columns[0],
State: columns[1],
Since: columns[2],
CPU: columns[3],
Memory: columns[4],
Disk: columns[5],
Details: details,
}
lastProcessIndex := len(appTable.Processes) - 1
appTable.Processes[lastProcessIndex].Instances = append(
appTable.Processes[lastProcessIndex].Instances,
instanceRow,
)
case strings.HasPrefix(row, "type:"):
appTable.Processes = append(appTable.Processes, AppProcessTable{
Type: strings.TrimSpace(strings.TrimPrefix(row, "type:")),
})
case strings.HasPrefix(row, "instances:"):
lpi := len(appTable.Processes) - 1
iVal := strings.TrimSpace(strings.TrimPrefix(row, "instances:"))
appTable.Processes[lpi].InstanceCount = iVal
case strings.HasPrefix(row, "memory usage:"):
lpi := len(appTable.Processes) - 1
mVal := strings.TrimSpace(strings.TrimPrefix(row, "memory usage:"))
appTable.Processes[lpi].MemUsage = mVal
default:
// column headers
continue
}
}
return appTable
}
func splitColumns(row string) []string {
// uses 3 spaces between columns
return regexp.MustCompile(`\s{3,}`).Split(strings.TrimSpace(row), -1)
}