part of group messages history

get.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+)
+
+func GetUserById(ctx context.Context, userId uuid.UUID) (*User, error) {
+	user, err := CacheGetUserById(userId)
+	if err != nil {
+		user = &User{Id: userId}
+		err = DbGetWholeUser(ctx, user)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return user, nil
+}
+
+func GetUserByToken(ctx context.Context, token string) (*User, error) {
+	userId, err := TokenValidateGetId(token)
+	if err != nil {
+		return nil, err
+	}
+	return GetUserById(ctx, userId)
+}
+
+func GetGroup(ctx context.Context, groupId uuid.UUID) (*Group, error) {
+	group, err := CacheGetGroup(groupId)
+	if err != nil {
+		group = &Group{Id: groupId}
+		if err = DbGroupGetById(ctx, group); err != nil {
+			return nil, err
+		}
+		if err = DbGroupGetMembers(ctx, group); err != nil {
+			return nil, err
+		}
+		CacheSaveGroup(group)
+	}
+	return group, nil
+}