Diffstat (limited to 'main.go')
| -rw-r--r-- | main.go | 286 |
1 files changed, 284 insertions, 2 deletions
@@ -1,20 +1,302 @@ package main import ( + "bytes" + "encoding/csv" + "encoding/json" "flag" + "hash/crc32" + "io" + "log/slog" + "os" + "os/signal" + "strconv" + "strings" + "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/converter" ) var ( - configPath = flag.String("c", "config.json", "Path to the configuration file") + configPath = flag.String("c", "config.json", "Path to the configuration file") + sigTermChan = make(chan os.Signal, 1) + cacheMapMutex = &sync.RWMutex{} + cacheMap = make(map[string]map[uint32]struct{}) ) func main() { + signal.Notify(sigTermChan, os.Interrupt, syscall.SIGTERM) + flag.Parse() cfg := &config.Config{} if err := config.LoadConfig(*configPath, cfg); err != nil { - panic(err) + 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) + } + + converters := make([]converter.Converter, 0, len(cfg.Converters)) + converterTypes := make([]string, 0, len(cfg.Converters)) + converterHashes := make([]uint32, 0, len(cfg.Converters)) + for _, converterCfg := range cfg.Converters { + converterBytes, _ := json.Marshal(converterCfg) + conv, err := converter.NewConverterMap[converterCfg.Type](&converterCfg) + if err != nil { + slog.Error("fail to initialize converter", slog.String("error", err.Error())) + os.Exit(1) + } + converters = append(converters, conv) + converterTypes = append(converterTypes, converterCfg.Type) + converterHashes = append(converterHashes, crc32.ChecksumIEEE(converterBytes)) + } + + generalLogger := slog.With(slog.String("input_storage", cfg.Input.Storage.Type)) + generalLogger.Info("initialized input client and converters", slog.String("converter_types", strings.Join(converterTypes, " "))) + + 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) + } + fileCount := len(files) + generalLogger.Info("scanned files", slog.Int("file_count", fileCount)) + + select { + case <-sigTermChan: + generalLogger.Info("exiting due to termination signal") + os.Exit(130) + default: + } + + if cfg.Input.CacheProcessed { + cacheFile, err := os.OpenFile(cfg.Input.CacheProcessedCsvPath, os.O_CREATE|os.O_RDONLY, 0644) + if err != nil { + generalLogger.Error("fail to initialize cache file", slog.String("cache_path", cfg.Input.CacheProcessedCsvPath), slog.String("error", err.Error())) + os.Exit(1) + } + defer cacheFile.Close() + + csvReader := csv.NewReader(cacheFile) + for { + rec, err := csvReader.Read() + if err == io.EOF { + break + } + if err != nil { + generalLogger.Error("fail to initialize cache while reading file", slog.String("cache_path", cfg.Input.CacheProcessedCsvPath), slog.String("error", err.Error())) + os.Exit(1) + } + if len(rec) != 2 { + generalLogger.Error("fail to initialize cache while reading file", slog.Int("record_length", len(rec)), slog.String("error", "incorrect format: expected '{image-name},{semicolon-separated-processor-hashes}'")) + os.Exit(1) + } + hashes := strings.Split(rec[1], ";") + cacheMap[rec[0]] = make(map[uint32]struct{}) + for _, hash := range hashes { + hashUint, err := strconv.ParseUint(hash, 10, 32) + if err != nil { + generalLogger.Error("fail to initialize cache while reading file", slog.Int("record_length", len(rec)), slog.String("error", err.Error())) + } + cacheMap[rec[0]][uint32(hashUint)] = struct{}{} + } + } + } + + select { + case <-sigTermChan: + generalLogger.Info("exiting due to termination signal") + os.Exit(130) + default: + } + + processSemaphore := make(chan struct{}, cfg.MaxProcessThreads) + queueSemaphore := make(chan struct{}, cfg.MaxPreProcessThreads) + var wg sync.WaitGroup + wg.Add(fileCount) + + processTerminating := false + + for i, file := range files { + queueSemaphore <- struct{}{} + + select { + case <-sigTermChan: + generalLogger.Info("exiting due to termination signal") + processTerminating = true + default: + } + + go func(index int, inputName string, earlyTerminate bool) { + defer func() { <-queueSemaphore; wg.Done() }() + + fileLogger := generalLogger.With(slog.String("input_path", inputName), slog.Int("file_index", index)) + + if earlyTerminate { + fileLogger.Info("skip processing file (process is terminating)") + return + } + + var inputMetadata *input.MetadataStruct + + id := inputClient.ID(file) + cacheMapMutex.Lock() + if _, ok := cacheMap[id]; !ok { + cacheMap[id] = make(map[uint32]struct{}) + } + cacheMapMutex.Unlock() + + convertersToLaunch := []int{} + for j, conv := range converters { + if cfg.Input.CacheProcessed { + cacheMapMutex.RLock() + if _, ok := cacheMap[id][converterHashes[j]]; ok { + cacheMapMutex.RUnlock() + fileLogger.Info("skip already processed file (based on cache file containing it and processor)", + slog.String("file_id", id), + slog.Uint64("conv_hash", uint64(converterHashes[j])), + slog.Int("conv_index", j)) + continue + } + cacheMapMutex.RUnlock() + } + outputName := conv.DeductOutputPath(inputName) + originalInputHash := "" + convLogger := fileLogger.With(slog.String("output_path", outputName), slog.Int("conv_index", j)) + + if inputMetadata == nil { + 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 + } + } + + switch cfg.Converters[j].Output.RewriteOn { + case "Never": + if !conv.IsMissing(outputName) { + convLogger.Info("skip already existing file") + continue + } + case "UnequalHashInCache": + if !conv.IsMissing(outputName) { + outputMetadata, err := conv.ReadMetadata(outputName) + if err != nil { + convLogger.Warn("fail to read metadata of (supposedly existing) output file", slog.String("error", err.Error())) + continue + } + originalInputHash = outputMetadata.HashOriginal + if inputMetadata.Hash == originalInputHash { + convLogger.Info("skip already processed file (based on equal hash)", slog.String("input_hash", inputMetadata.Hash)) + cacheMapMutex.Lock() + cacheMap[id][converterHashes[j]] = struct{}{} + cacheMapMutex.Unlock() + continue + } + } + case "Always": + } + + convertersToLaunch = append(convertersToLaunch, j) + } + + if len(convertersToLaunch) == 0 { + return + } + + processSemaphore <- struct{}{} + defer func() { <-processSemaphore }() + + fileLogger.Info("start to process file", slog.String("input_hash", inputMetadata.Hash)) + reader, err := inputClient.GetReader(inputName) + if err != nil { + fileLogger.Warn("fail to get reader for input file", slog.String("error", err.Error())) + return + } + + fileContent, err := io.ReadAll(reader) + if err != nil { + fileLogger.Warn("fail to read content of input file", slog.String("error", err.Error())) + return + } else if int64(len(fileContent)) != inputMetadata.Size { + fileLogger.Warn("the downloaded file seems to be missing some of its content", + slog.Int("actual_size_bytes", len(fileContent)), + slog.Int64("expected_size_bytes", inputMetadata.Size)) + } + reader.Close() + + for _, convIndex := range convertersToLaunch { + conv := converters[convIndex] + outputName := conv.DeductOutputPath(inputName) + convLogger := fileLogger.With(slog.String("output_path", outputName), slog.Int("conv_index", convIndex)) + + if err := conv.Process(inputMetadata, bytes.NewReader(fileContent), outputName); err != nil { + convLogger.Warn("fail to convert file", slog.String("error", err.Error())) + return + } + + convLogger.Info("successfully processed file", slog.String("input_hash", inputMetadata.Hash)) + cacheMapMutex.Lock() + cacheMap[id][converterHashes[convIndex]] = struct{}{} + cacheMapMutex.Unlock() + } + }(i, file, processTerminating) + } + + wg.Wait() + + select { + case <-sigTermChan: + generalLogger.Info("exiting due to termination signal") + os.Exit(130) + default: + } + + generalLogger.Info("all files processed successfully") + + if cfg.Input.CacheProcessed { + generalLogger.Info("writing cache file") + cacheFile, err := os.OpenFile(cfg.Input.CacheProcessedCsvPath, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644) + if err != nil { + generalLogger.Error("error writing cache into file") + } else { + for id, hashes := range cacheMap { + var hashStrings = make([]string, 0, len(hashes)) + for hash := range hashes { + hashStrings = append(hashStrings, strconv.FormatUint(uint64(hash), 10)) + } + cacheFile.Write([]byte(id)) + cacheFile.Write([]byte{','}) + cacheFile.WriteString(strings.Join(hashStrings, ";")) + cacheFile.Write([]byte{'\n'}) + } + } } + + os.Exit(0) } |