positions

type Config struct {
	SyncPeriod        time.Duration `mapstructure:"sync_period" yaml:"sync_period"`
	PositionsFile     string        `mapstructure:"filename" yaml:"filename"`
	IgnoreInvalidYaml bool          `mapstructure:"ignore_invalid_yaml" yaml:"ignore_invalid_yaml"`
	ReadOnly          bool          `mapstructure:"-" yaml:"-"`
}

type Entry struct {
	Path   string `yaml:"path"`
	Labels string `yaml:"labels"`
}

type File struct {
	Positions map[Entry]string `yaml:"positions"`
}

type LegacyFile struct {
	Positions map[string]string `yaml:"positions"`
}

type Positions interface {
	// GetString returns how far we've through a file as a string.
	// JournalTarget writes a journal cursor to the positions file, while
	// FileTarget writes an integer offset. Use Get to read the integer
	// offset.
	GetString(path, labels string) string
	// Get returns how far we've read through a file. Returns an error
	// if the value stored for the file is not an integer.
	Get(path, labels string) (int64, error)
	// PutString records (asynchronously) how far we've read through a file.
	// Unlike Put, it records a string offset and is only useful for
	// JournalTargets which doesn't have integer offsets.
	PutString(path, labels string, pos string)
	// Put records (asynchronously) how far we've read through a file.
	Put(path, labels string, pos int64)
	// Remove removes the position tracking for a filepath
	Remove(path, labels string)
	// SyncPeriod returns how often the positions file gets resynced
	SyncPeriod() time.Duration
	// Stop the Position tracker.
	Stop()
}