added possibility to add a new container group

client/GroupTrackContainer.go

@@ -0,0 +1,111 @@
+package client
+
+import (
+	"encoding/json"
+	"git.sr.ht/~akilan1999/p2p-rendering-computation/config"
+	"github.com/google/uuid"
+	"io/ioutil"
+	"os"
+)
+
+// Groups Data Structure type
+type Groups struct {
+	GroupList []*Group `json:"Groups"`
+}
+
+// Group Information about a single group
+type Group struct {
+	ID string `json:"ID"`
+	TrackContainerList []*TrackContainer `json:"TrackContainer"`
+}
+
+// CreateGroup Creates a new group to add a set of trackcontainers
+func CreateGroup() (*Group, error){
+	// Creating variable of type new group
+	var NewGroup Group
+	// Generate new UUID for group ID
+	id := uuid.New()
+	// Add new group id and prepend with the string "grp"
+	// The reason this is done is to differentiate between a
+	// group ID and docker container ID
+	NewGroup.ID = "grp" + id.String()
+	// Adding the new group to the
+	// GroupTrackContainer File
+	err := NewGroup.AddGroupToFile()
+	if err != nil {
+		return nil, err
+	}
+
+	return &NewGroup,nil
+}
+
+// AddGroupToFile Adds Group struct to the GroupTrackContainer File
+func (grp *Group) AddGroupToFile() error {
+	// Gets all group information from the
+	// GroupTrackContainer JSON file
+    groups, err := ReadGroup()
+    if err != nil {
+    	return err
+	}
+	// Appending the newly created group
+	groups.GroupList = append(groups.GroupList, grp)
+	// Writing Group information to the GroupTrackContainer
+	// JSON file
+	err = groups.WriteGroup()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// ReadGroup Function reads grouptrackcontainers.json and converts
+// result to Groups
+func ReadGroup() (*Groups,error) {
+	// Get Path from config
+	config, err := config.ConfigInit()
+	if err != nil {
+		return nil,err
+	}
+	jsonFile, err := os.Open(config.GroupTrackContainersPath)
+	// if we os.Open returns an error then handle it
+	if err != nil {
+		return nil,err
+	}
+
+	// defer the closing of our jsonFile so that we can parse it later on
+	defer jsonFile.Close()
+
+	// read our opened xmlFile as a byte array.
+	byteValue, _ := ioutil.ReadAll(jsonFile)
+
+	// we initialize our Users array
+	var groups Groups
+
+	// we unmarshal our byteArray which contains our
+	// jsonFile's content into 'users' which we defined above
+	json.Unmarshal(byteValue, &groups)
+	return &groups, nil
+}
+
+
+// WriteGroup Function to write type Groups to the grouptrackcontainers.json file
+func (grp *Groups)WriteGroup() error {
+	file, err := json.MarshalIndent(grp, "", " ")
+	if err != nil {
+		return err
+	}
+
+	// Get Path from config
+	config, err := config.ConfigInit()
+	if err != nil {
+		return err
+	}
+    // Writes to the appropriate file
+	err = ioutil.WriteFile(config.GroupTrackContainersPath, file, 0644)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}