57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
// Package m is the glue which holds all the other packages in this project
|
|
// together. While other packages in this project are intended to be able to be
|
|
// used separately and largely independently, this package combines them in ways
|
|
// which I specifically like.
|
|
package m
|
|
|
|
import (
|
|
"os"
|
|
"os/signal"
|
|
|
|
"github.com/mediocregopher/mediocre-go-lib/mcfg"
|
|
"github.com/mediocregopher/mediocre-go-lib/mctx"
|
|
"github.com/mediocregopher/mediocre-go-lib/merr"
|
|
"github.com/mediocregopher/mediocre-go-lib/mlog"
|
|
"github.com/mediocregopher/mediocre-go-lib/mrun"
|
|
)
|
|
|
|
// CfgSource returns an mcfg.Source which takes in configuration info from the
|
|
// environment and from the CLI.
|
|
func CfgSource() mcfg.Source {
|
|
return mcfg.Sources{
|
|
mcfg.SourceEnv{},
|
|
mcfg.SourceCLI{},
|
|
}
|
|
}
|
|
|
|
// TODO Create a function, `NewService() mctx.Context` which preloads the
|
|
// context with log-level param. Will one day also add debug server. Problem
|
|
// comes because mlog isn't quite designed right and setting log-level from
|
|
// config won't propagate changes to child contexts which have already called
|
|
// mlog.From.
|
|
|
|
// Run performs the work of populating configuration parameters, triggering the
|
|
// start event, waiting for an interrupt, and then triggering the stop event.
|
|
// Run will block until the stop event is done. If any errors are encountered a
|
|
// fatal is thrown.
|
|
func Run(ctx mctx.Context) {
|
|
log := mlog.From(ctx)
|
|
if err := mcfg.Populate(ctx, CfgSource()); err != nil {
|
|
log.Fatal("error populating configuration", merr.KV(err))
|
|
} else if err := mrun.Start(ctx); err != nil {
|
|
log.Fatal("error triggering start event", merr.KV(err))
|
|
}
|
|
|
|
{
|
|
ch := make(chan os.Signal, 1)
|
|
signal.Notify(ch, os.Interrupt)
|
|
s := <-ch
|
|
log.Info("signal received, stopping", mlog.KV{"signal": s})
|
|
}
|
|
|
|
if err := mrun.Stop(ctx); err != nil {
|
|
log.Fatal("error triggering stop event", merr.KV(err))
|
|
}
|
|
log.Info("exiting process")
|
|
}
|