nmon/testdata/gen/main.go

// Command gen writes the synthetic fixtures into testdata/snmprec: one
// <profile>.snmprec per shipped profile (generated from the profile's own
// metric list), the behaviour fixtures and their <name>.agent.yaml sidecars.
// Run it from the repository root: go run ./testdata/gen
//
// With -expect it also writes a <name>.expect.yaml, for fixtures that have
// none, from a profiletest run against the fixture (-force replaces existing
// ones). Those are DRAFTS: review each one before committing (the PDU counts
// and series lists are the contract a profile change must keep).
package main

import (
	"context"
	"flag"
	"fmt"
	"os"
	"path/filepath"

	"github.com/v10networks/nmon/internal/fixturegen"
	"github.com/v10networks/nmon/internal/fixtures"
	"github.com/v10networks/nmon/internal/profile"
	"github.com/v10networks/nmon/internal/snmprec"
)

func main() {
	out := flag.String("out", "testdata/snmprec", "output directory")
	expect := flag.Bool("expect", false, "also rewrite draft <name>.expect.yaml files by running profiletest against each fixture")
	force := flag.Bool("force", false,
		"with -expect: overwrite expect.yaml files that already exist (they are reviewed; this discards the review)")
	flag.Parse()
	if err := run(*out); err != nil {
		fmt.Fprintln(os.Stderr, "gen:", err)
		os.Exit(1)
	}
	if *expect {
		if err := fixtures.WriteDrafts(context.Background(), *out, *force); err != nil {
			fmt.Fprintln(os.Stderr, "gen -expect:", err)
			os.Exit(1)
		}
	}
}

func run(dir string) error {
	set, err := profile.Load("")
	if err != nil {
		return err
	}
	all, err := fixturegen.All(set)
	if err != nil {
		return err
	}
	for _, f := range all {
		for _, r := range f.Recordings {
			if err := write(filepath.Join(dir, r.Stem+".snmprec"), r.Rec); err != nil {
				return err
			}
		}
		y, err := f.AgentYAML()
		if err != nil {
			return err
		}
		if y != nil {
			if err := os.WriteFile(filepath.Join(dir, f.Name+".agent.yaml"), y, 0o644); err != nil {
				return err
			}
		}
	}
	return nil
}

func write(path string, rec *snmprec.Recording) error {
	f, err := os.Create(path)
	if err != nil {
		return err
	}
	if err := snmprec.Write(f, rec); err != nil {
		_ = f.Close() // best-effort: the write error is the one to report
		return err
	}
	return f.Close()
}