Rename daemon to litestreamd

cmd/litestreamd/config.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/user"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v2"
+)
+
+// Config represents a configuration file for the litestream daemon.
+type Config struct {
+	DBs []*DBConfig `yaml:"databases"`
+}
+
+// DefaultConfig returns a new instance of Config with defaults set.
+func DefaultConfig() Config {
+	return Config{}
+}
+
+// ReadConfigFile unmarshals config from filename. Expands path if needed.
+func ReadConfigFile(filename string) (Config, error) {
+	config := DefaultConfig()
+
+	// Expand filename, if necessary.
+	if prefix := "~" + string(os.PathSeparator); strings.HasPrefix(filename, prefix) {
+		u, err := user.Current()
+		if err != nil {
+			return config, err
+		} else if u.HomeDir == "" {
+			return config, fmt.Errorf("home directory unset")
+		}
+		filename = filepath.Join(u.HomeDir, strings.TrimPrefix(filename, prefix))
+	}
+
+	// Read & deserialize configuration.
+	if buf, err := ioutil.ReadFile(filename); os.IsNotExist(err) {
+		return config, fmt.Errorf("config file not found: %s", filename)
+	} else if err != nil {
+		return config, err
+	} else if err := yaml.Unmarshal(buf, &config); err != nil {
+		return config, err
+	}
+	return config, nil
+}
+
+type DBConfig struct {
+	Path        string              `yaml:"path"`
+	Replicators []*ReplicatorConfig `yaml:"replicators`
+}
+
+type ReplicatorConfig struct {
+	Type string `yaml:"type"` // "file", "s3"
+	Name string `yaml:"name"` // name of replicator, optional.
+	Path string `yaml:"path"` // used for file replicators
+}