66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
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package main
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import (
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"errors"
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"log/slog"
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"net/http"
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"os"
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"time"
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"github.com/caarlos0/env/v10"
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"github.com/lmittmann/tint"
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"go.xsfx.dev/glucose_exporter/httpslog"
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"go.xsfx.dev/glucose_exporter/internal/cache"
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"go.xsfx.dev/glucose_exporter/internal/config"
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"go.xsfx.dev/glucose_exporter/internal/metrics"
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)
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const addr = ":2112"
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func main() {
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logOpts := &tint.Options{Level: slog.LevelInfo, TimeFormat: time.Kitchen}
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initLogging(logOpts)
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if err := env.Parse(&config.Cfg); err != nil {
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slog.Error("parsing env config", "err", err)
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os.Exit(1)
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}
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if config.Cfg.Debug {
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initLogging(&tint.Options{Level: slog.LevelDebug, TimeFormat: time.Kitchen})
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}
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cacheFileLogger := slog.With("file", cache.FullPath())
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// Check if cache files needs to be created.
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_, err := os.Stat(cache.FullPath())
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if err != nil {
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if errors.Is(err, os.ErrNotExist) {
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if err := os.WriteFile(cache.FullPath(), []byte("{}"), 0o600); err != nil {
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cacheFileLogger.Error("init cache file", "err", err)
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os.Exit(1)
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} else {
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cacheFileLogger.Debug("init cache file")
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}
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} else {
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cacheFileLogger.Error("getting cache file stat", "err", err)
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os.Exit(1)
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}
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}
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mux := http.NewServeMux()
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mux.HandleFunc("/metrics", metrics.Handler)
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slog.Info("listening", "addr", addr)
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if err := http.ListenAndServe(addr, httpslog.Handler()(mux)); err != nil {
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slog.Error("listen and serve", "err", err)
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os.Exit(1)
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}
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}
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func initLogging(opts *tint.Options) {
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slog.SetDefault(slog.New(tint.NewHandler(os.Stderr, opts)))
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}
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