Remove server configurations files and add shared state file

server/state.go

@@ -0,0 +1,95 @@
+package server
+
+import (
+	"encoding/json"
+	"github.com/pkg/errors"
+	"os"
+)
+
+var statesFile = "data/states.json"
+
+// DoesStatesFileExist .
+func DoesStatesFileExist() (bool, error) {
+	if _, err := os.Stat(statesFile); err != nil {
+		if !os.IsNotExist(err) {
+			return false, errors.WithStack(err)
+		}
+
+		return false, nil
+	}
+
+	return true, nil
+}
+
+// FetchServerStates .
+func FetchServerStates() (map[string]string, error) {
+	// Check if the states file exists.
+	exists, err := DoesStatesFileExist()
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	// Return an empty map if the file does not exist.
+	if !exists {
+		return map[string]string{}, nil
+	}
+
+	// Open the states file.
+	f, err := os.Open(statesFile)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+	defer f.Close()
+
+	// Convert the json object to a map.
+	states := map[string]string{}
+	if err := json.NewDecoder(f).Decode(states); err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	return states, nil
+}
+
+// SaveServerStates .
+func SaveServerStates() error {
+	// Get the states of all servers on the daemon.
+	states := map[string]string{}
+	for _, s := range GetServers().All() {
+		states[s.Uuid] = s.State
+	}
+
+	// Convert the map to a json object.
+	data, err := json.Marshal(states)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	// Check if the states file exists.
+	exists, err := DoesStatesFileExist()
+	if err != nil {
+		return errors.WithStack(err)
+	}
+
+	// Create the file if it doesn't exist or open it if it already does.
+	var f *os.File
+	if !exists {
+		f, err = os.Create(statesFile)
+		if err != nil {
+			return errors.WithStack(err)
+		}
+	} else {
+		f, err = os.Open(statesFile)
+		if err != nil {
+			return errors.WithStack(err)
+		}
+	}
+	defer f.Close()
+
+	// Write the data to the file
+	if _, err := f.Write(data); err != nil {
+		return errors.WithStack(err)
+	}
+
+	// Save the file basically.
+	return f.Sync()
+}