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package main
import (
"flag"
"log/slog"
"os"
"os/signal"
"sync"
"syscall"
"github.com/SayaAndy/saya-today-thumbnail-generator/config"
"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/input"
"github.com/SayaAndy/saya-today-thumbnail-generator/internal/client/output"
"github.com/SayaAndy/saya-today-thumbnail-generator/internal/converter"
)
var (
configPath = flag.String("c", "config.json", "Path to the configuration file")
sigTermChan = make(chan os.Signal, 1)
)
func main() {
signal.Notify(sigTermChan, os.Interrupt, syscall.SIGTERM)
flag.Parse()
cfg := &config.Config{}
if err := config.LoadConfig(*configPath, cfg); err != nil {
slog.Error("fail to load configuration", slog.String("error", err.Error()))
os.Exit(1)
}
slog.SetLogLoggerLevel(cfg.LogLevel)
slog.Info("starting thumbnail generator...")
select {
case <-sigTermChan:
slog.Info("exiting due to termination signal")
os.Exit(130)
default:
}
inputClient, err := input.NewInputClientMap[cfg.Input.Storage.Type](&cfg.Input)
if err != nil {
slog.Error("fail to initialize input client", slog.String("error", err.Error()))
os.Exit(1)
}
outputClient, err := output.NewOutputClientMap[cfg.Output.Storage.Type](&cfg.Output)
if err != nil {
slog.Error("fail to initialize output client", slog.String("error", err.Error()))
os.Exit(1)
}
conv, err := converter.NewConverterMap[cfg.Converter.Type](&cfg.Converter)
if err != nil {
slog.Error("fail to initialize converter", slog.String("error", err.Error()))
os.Exit(1)
}
generalLogger := slog.With(
slog.String("input_storage", cfg.Input.Storage.Type),
slog.String("converter_type", cfg.Converter.Type),
slog.String("output_storage", cfg.Output.Storage.Type),
)
generalLogger.Info("initialized clients and converter")
select {
case <-sigTermChan:
generalLogger.Info("exiting due to termination signal")
os.Exit(130)
default:
}
files, err := inputClient.Scan()
if err != nil {
generalLogger.Error("fail to scan input files", slog.String("error", err.Error()))
os.Exit(1)
}
generalLogger.Info("scanned files", slog.Int("file_count", len(files)))
select {
case <-sigTermChan:
generalLogger.Info("exiting due to termination signal")
os.Exit(130)
default:
}
semaphore := make(chan struct{}, cfg.MaxConcurrentJobs)
var wg sync.WaitGroup
wg.Add(len(files))
for i, file := range files {
go func(index int, inputName string) {
outputName := conv.DeductOutputPath(inputName)
fileLogger := generalLogger.With(slog.String("input_path", inputName), slog.String("output_path", outputName), slog.Int("file_index", index))
threadSigTermChannel := make(chan os.Signal, 1)
signal.Notify(threadSigTermChannel, os.Interrupt, syscall.SIGTERM)
defer func() { <-semaphore }()
defer wg.Done()
semaphore <- struct{}{}
select {
case <-threadSigTermChannel:
fileLogger.Info("exiting due to termination signal")
return
default:
}
inputMetadata, err := inputClient.ReadMetadata(inputName)
if err != nil {
fileLogger.Warn("fail to read metadata of (supposedly existing) input file", slog.String("error", err.Error()))
return
}
originalInputHash := ""
if !cfg.ForceRewrite && !outputClient.IsMissing(outputName) {
outputMetadata, err := outputClient.ReadMetadata(outputName)
if err != nil {
fileLogger.Warn("fail to read metadata of (supposedly existing) output file", slog.String("error", err.Error()))
return
}
originalInputHash = outputMetadata.HashOriginal
if inputMetadata.Hash == originalInputHash {
fileLogger.Info("skip already processed file (based on equal hash)", slog.String("input_hash", inputMetadata.Hash))
return
}
}
fileLogger.Info("start to process file", slog.String("input_hash", inputMetadata.Hash), slog.String("original_input_hash", originalInputHash))
reader, err := inputClient.GetReader(inputName)
if err != nil {
fileLogger.Warn("fail to get reader for input file", slog.String("error", err.Error()))
return
}
writer, err := outputClient.GetWriter(outputName, inputMetadata)
if err != nil {
fileLogger.Warn("fail to get writer for output file", slog.String("error", err.Error()))
return
}
if err := conv.Process(inputMetadata.ContentType, reader, writer); err != nil {
fileLogger.Warn("fail to convert file", slog.String("error", err.Error()))
return
}
fileLogger.Info("successfully processed file", slog.String("input_hash", inputMetadata.Hash))
}(i, file)
}
wg.Wait()
select {
case <-sigTermChan:
generalLogger.Info("exiting due to termination signal")
os.Exit(130)
default:
generalLogger.Info("all files processed successfully, exiting")
os.Exit(0)
}
}
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