public async Task <Group> CreateGroup(string newGroupName)
{
Guid newGroupId = Guid.NewGuid();
var groupTable = _tableClient.GetTableReference(newGroupId.ToTableString());
await groupTable.CreateAsync();
var metadata = new GroupMetadata {
Name = newGroupName, CreationTime = DateTime.UtcNow
};
TableOperation addMetadataOp = TableOperation.Insert(new TableEntityAdapter <GroupMetadata>(metadata, PartitionNames.Metadata, PartitionNames.Metadata));
TableResult addMetadataResult = await groupTable.ExecuteAsync(addMetadataOp);
if (addMetadataResult.Result is TableEntityAdapter <GroupMetadata> groupMetaData)
{
await AddOrUpdateToGroupsList(groupMetaData.OriginalEntity, newGroupId, 0);
_logger.LogInformation($"Group with ID {newGroupId} and name {groupMetaData.OriginalEntity.Name} added.");
return(new Group
{
Count = 0,
CreationTime = groupMetaData.OriginalEntity.CreationTime,
Id = newGroupId,
Name = groupMetaData.OriginalEntity.Name
});
}
else
{
await groupTable.DeleteAsync();
_logger.LogError($"Unable to add table named {newGroupName} to database.");
return(null);
}
}
public async Task <ServiceResult> AddUserToGroup(User user, Guid groupId)
{
var groupTable = _tableClient.GetTableReference(groupId.ToTableString());
if (!await groupTable.ExistsAsync())
{
_logger.LogError($"Could not find any group with ID {groupId}.");
return(ServiceResult.NotFound);
}
TableOperation getExistingUser = TableOperation.Retrieve <TableEntityAdapter <UserEntity> >(PartitionNames.User, user.Id.ToIdString());
TableResult existsResult = await groupTable.ExecuteAsync(getExistingUser);
if (existsResult.Result is TableEntityAdapter <UserEntity> )
{
// User already exists. We're done!
return(ServiceResult.Success);
}
// Verify group isn't currently full.
int groupCount = await GetGroupCount(groupId);
if (groupCount >= MaxGroupSize)
{
_logger.LogInformation($"Unable to add user {user.Name}-{user.Id} to group ID {groupId}. Group already has {groupCount} users.");
return(ServiceResult.InvalidArguments);
}
var userEntity = new TableEntityAdapter <UserEntity>(
new UserEntity
{
Name = user.Name,
LastSeen = DateTime.UtcNow
}, PartitionNames.User, user.Id.ToIdString());
TableOperation addUser = TableOperation.Insert(userEntity);
TableResult addResult = await groupTable.ExecuteAsync(addUser);
if (addResult.HttpStatusCode != StatusCodes.Status204NoContent)
{
_logger.LogError($"Unable to add user {user.Name}-{user.Id} to group {groupId}. Result code: {addResult.HttpStatusCode}");
return(ServiceResult.ServerError);
}
// User added. Do bookkeeping
GroupMetadata metadata = await GetGroupMetadata(groupId);
await AddOrUpdateToGroupsList(metadata, groupId, groupCount + 1);
await AddToUserGroups(user.Id, groupId, DateTime.UtcNow);
return(ServiceResult.Success);
}
private async Task AddOrUpdateToGroupsList(GroupMetadata group, Guid groupId, int count)
{
var allGroupsTable = _tableClient.GetTableReference(TableNames.AllGroups);
await allGroupsTable.CreateIfNotExistsAsync();
var groupEntry = new AllGroupsGroupEntry
{
Name = group.Name,
Count = count,
CreationTime = group.CreationTime
};
var addOrUpdateOperation = TableOperation.InsertOrReplace(
new TableEntityAdapter <AllGroupsGroupEntry>(groupEntry, PartitionNames.Group, groupId.ToIdString()));
TableResult result = await allGroupsTable.ExecuteAsync(addOrUpdateOperation);
if (!(result.Result is TableEntityAdapter <AllGroupsGroupEntry>))
{
// This isn't fatal. We'll catch it next time we do a group update.
_logger.LogWarning($"Failed to update group list metadata table with new group: ID - {groupId}, Name - {group.Name}. Status code: {result.HttpStatusCode}");
}
}