Ben Vin
016f93ab4f
Add a monorepo for small single-purpose CLI tools that share a common library, so tools reuse TUI primitives and Kubernetes client bootstrapping instead of duplicating them. - common/tui: direction markers, style palette, width-aware padding/layout - common/kube: in-cluster→kubeconfig client loading + core/metrics clients - podgap: live TUI comparing pod requests/limits vs actual usage, with up/down markers showing per-pod change since the last refresh - Makefile auto-discovers tool directories: make <tool> | all | install
74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
// Command podgap shows the gap between what Kubernetes pods reserve
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// (requests/limits) and what they actually use, live in a terminal UI.
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//
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// The default mode opens an interactive TUI that refreshes in place and marks
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// whether each pod's usage rose or fell since the last refresh. The json/csv
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// output modes are one-shot dumps for scripting.
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package main
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import (
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"context"
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"fmt"
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"os"
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"time"
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"git.unkin.net/unkin/benvin-utils/common/kube"
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"github.com/spf13/pflag"
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)
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type options struct {
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namespace string
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sortKey string
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top int
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interval time.Duration
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output string
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kubeconfig string
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overOnly bool
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underOnly bool
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threshold float64
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}
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func main() {
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opts := options{}
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pflag.StringVarP(&opts.namespace, "namespace", "n", "", "namespace to inspect (default: all namespaces)")
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pflag.StringVarP(&opts.sortKey, "sort", "s", "cpu-waste", "sort by: cpu-waste, mem-waste, cpu-util, mem-util, cpu-use, mem-use, name")
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pflag.IntVar(&opts.top, "top", 0, "show only the top N rows after sorting (0 = all)")
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pflag.DurationVarP(&opts.interval, "interval", "i", 0, "TUI refresh interval (e.g. 5s); 0 = default 3s")
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pflag.StringVarP(&opts.output, "output", "o", "tui", "output: tui (interactive), json, csv")
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pflag.StringVar(&opts.kubeconfig, "kubeconfig", "", "path to kubeconfig (default: $KUBECONFIG or ~/.kube/config)")
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pflag.BoolVar(&opts.overOnly, "over", false, "show only over-provisioned pods (util below --threshold)")
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pflag.BoolVar(&opts.underOnly, "under", false, "show only under-provisioned pods (usage above request or limit)")
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pflag.Float64Var(&opts.threshold, "threshold", 0.5, "utilization fraction below which a pod is 'over-provisioned' (with --over)")
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pflag.Parse()
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if err := run(opts); err != nil {
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fmt.Fprintln(os.Stderr, "error:", err)
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os.Exit(1)
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}
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}
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func run(opts options) error {
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core, mc, err := kube.Clients(opts.kubeconfig)
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if err != nil {
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return err
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}
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// json/csv are one-shot, script-friendly dumps; anything else opens the TUI.
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switch opts.output {
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case "json", "csv":
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rows, err := collect(context.Background(), core, mc, opts.namespace)
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if err != nil {
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return err
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}
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rows = filterRows(rows, opts)
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sortRows(rows, opts.sortKey)
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if opts.top > 0 && len(rows) > opts.top {
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rows = rows[:opts.top]
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}
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return render(os.Stdout, rows, opts.output)
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default:
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return runTUI(core, mc, opts)
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}
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}
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