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main.go
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main.go
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package main
import (
"context"
"errors"
"fmt"
"net/http"
"os"
"os/exec"
"time"
"github.com/alecthomas/kong"
"github.com/efficientgo/core/runutil"
"github.com/go-kit/log/level"
"github.com/metalmatze/signal/healthcheck"
"github.com/metalmatze/signal/internalserver"
"github.com/oklog/run"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/kakkoyun/subshells/pkg/logger"
)
var (
version string
commit string
date string
builtBy string
)
type Flags struct {
LogLevel string `default:"info" enum:"error,warn,info,debug" help:"log level."`
Address string `default:":8080" help:"Address string for internal server"`
Interval time.Duration `default:"1s" help:"Interval between each shell execution"`
}
func main() {
flags := &Flags{}
_ = kong.Parse(flags)
logger := logger.NewLogger(flags.LogLevel, logger.LogFormatLogfmt, "subshells")
level.Debug(logger).Log("msg", "subshells initialized",
"version", version,
"commit", commit,
"date", date,
"builtBy", builtBy,
)
registry := prometheus.NewRegistry()
registry.MustRegister(
collectors.NewBuildInfoCollector(),
collectors.NewGoCollector(),
collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
)
healthchecks := healthcheck.NewMetricsHandler(healthcheck.NewHandler(), registry)
h := internalserver.NewHandler(
internalserver.WithHealthchecks(healthchecks),
internalserver.WithPrometheusRegistry(registry),
internalserver.WithPProf(),
)
s := http.Server{
Addr: flags.Address,
Handler: h,
}
var g run.Group
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
g.Add(func() error {
level.Info(logger).Log("msg", "running the loop in a shell")
repeatInterval := flags.Interval
return runutil.Repeat(repeatInterval, ctx.Done(), func() error {
level.Info(logger).Log("msg", "new shell")
ctx, cancel := context.WithTimeout(ctx, repeatInterval-(10*time.Millisecond))
defer cancel()
if err := runShell(ctx, fmt.Sprintf("./bin/infiniteloop --log-level=%s", flags.LogLevel)); err != nil {
level.Debug(logger).Log("msg", "shell failed", "err", err)
}
level.Info(logger).Log("msg", "shell finished")
return nil
})
}, func(_ error) {
cancel()
})
g.Add(func() error {
level.Info(logger).Log("msg", "starting internal HTTP server", "address", s.Addr)
return s.ListenAndServe()
}, func(err error) {
_ = s.Shutdown(context.Background())
})
g.Add(run.SignalHandler(ctx, os.Interrupt, os.Kill))
if err := g.Run(); err != nil {
var e run.SignalError
if errors.As(err, &e) {
level.Error(logger).Log("msg", "program exited with signal", "err", err, "signal", e.Signal)
} else {
level.Error(logger).Log("msg", "program exited with error", "err", err)
}
os.Exit(1)
}
level.Info(logger).Log("msg", "exited")
}
func runShell(ctx context.Context, command string) error {
cmd := exec.CommandContext(ctx, "sh", "-c", command)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
return cmd.Run()
}