Heroic Labs Documentation

Collections #

Every app or game has data which is specific to the project.

This information must be stored for users, updated, retrieved, and displayed within various parts of a UI. For this purpose the server incorporates a storage engine with a design optimized for object ownership, access permissions, and batch operations.

Data is stored in collections with one or more objects which contain a unique key with JSON content. A collection is created without any configuration required. This creates a simple nested namespace which represents the location of a object.

Collection
+---------------------------------------------------------------------+
|  Object                                                             |
|  +----------+------------+-------------+-----+-------------------+  |
|  | ?UserId? | Identifier | Permissions | ... |       Value       |  |
|  +---------------------------------------------------------------+  |
+---------------------------------------------------------------------+

This design gives great flexibility for developers to group sets of information which belong together within a game or app.

Writing custom SQL is discouraged in favor of using the built-in features of the Storage Engine. If custom SQL is needed for your use case, please contact Heroic Labs before proceeding.
The creation of custom tables is strongly discouraged.

Write objects #

A user can write one or more objects which will be stored in the database server. These objects will be written in a single transaction which guarantees the writes succeed together.

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curl -X PUT "http://127.0.0.1:7350/v2/storage" \
  -H 'Authorization: Bearer <session token>' \
  -d '{"objects":
    [
      {
        "collection": "saves",
        "key": "savegame",
        "value": "{\"progress\": \"50\"}"
      },
      {
        "collection": "stats",
        "key": "skill",
        "value": "{\"progress\": \"24\"}"
      }
    ]
  }'
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var save_game = { "progress": 50 };
var my_stats = { "skill": 24 };

const object_ids = await client.writeStorageObjects(session, [
  {
    "collection": "saves",
    "key": "savegame",
    "value": save_game
  }, {
    "collection": "stats",
    "key": "skills",
    "value": my_stats
  }
]);

console.info("Successfully stored objects: ", object_ids);
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var saveGame = "{ \"progress\": 50 }";
var myStats = "{ \"skill\": 24 }";

var writeObjects = new [] {
    new WriteStorageObject
    {
        Collection = "saves",
        Key = "savegame",
        Value = saveGame
    },
    new WriteStorageObject
    {
        Collection = "stats",
        Key = "skills",
        Value = myStats
    }
};

await client.WriteStorageObjectsAsync(session, writeObjects);
Console.WriteLine("Successfully stored objects: [{0}]", string.Join(",\n  ", objectIds));
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auto successCallback = [](const NStorageObjectAcks& acks)
{
    std::cout << "Successfully stored objects " << acks.size() << std::endl;
};

std::vector<NStorageObjectWrite> objects;
NStorageObjectWrite savesObject, statsObject;
savesObject.collection = "saves";
savesObject.key = "savegame";
savesObject.value = "{ \"progress\": 50 }";
objects.push_back(savesObject);

statsObject.collection = "stats";
statsObject.key = "skills";
statsObject.value = "{ \"skill\": 24 }";
objects.push_back(statsObject);
client->writeStorageObjects(session, objects, successCallback);
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String saveGame = "{ \"progress\": 50 }";
String myStats = "{ \"skill\": 24 }";
StorageObjectWrite saveGameObject = new StorageObjectWrite("saves", "savegame", saveGame, PermissionRead.OWNER_READ, PermissionWrite.OWNER_WRITE);
StorageObjectWrite statsObject = new StorageObjectWrite("stats", "skills", myStats, PermissionRead.OWNER_READ, PermissionWrite.OWNER_WRITE);
StorageObjectAcks acks = client.writeStorageObjects(session, saveGameObject, statsObject).get();
System.out.format("Stored objects %s", acks.getAcksList());
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var save_game = "{ \"progress\": 50 }"
var my_stats = "{ \"skill\": 24 }"
var can_read = 1
var can_write = 1
var version = ""

var acks : NakamaAPI.ApiStorageObjectAcks = yield(client.write_storage_objects_async(session, [
    NakamaWriteStorageObject.new("saves", "savegame", can_read, can_write, save_game, version),
    NakamaWriteStorageObject.new("stats", "skills", can_read, can_write, my_stats, version)
]), "completed")

if acks.is_exception():
    print("An error occurred: %s" % acks)
    return

print("Successfully stored objects:")

for a in acks.acks:
    print("%s" % a)
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PUT /v2/storage
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
{
  "objects": [
    {
      "collection": "saves",
      "key": "key",
      "value": "{\"hello\": \"world\"}"
    },
    {
      "collection": "stats",
      "key": "skill",
      "value": "{\"progress\": \"24\"}"
    }
  ]
}
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local save_game = json.encode({ progress = 50 })
local my_stats = json.encode({ skill = 24 })
local can_read = 1
local can_write = 1
local version = ""

local objects = {
  {
				collection = "saves",
				key = "savegame",
				permissionRead = can_read,
				permissionWrite = can_write,
				value = save_game,
				version = version,
  },
  {
				collection = "stats",
				key = "skills",
				permissionRead = can_read,
				permissionWrite = can_write,
				value = my_stats,
				version = version,
  }
}

local result = client.write_storage_objects(objects)

if result.error then
  print(result.message)
  return
end

for _,ack in ipairs(result.acks) do
  pprint(ack)
end

Conditional writes #

When objects are successfully stored a version is returned which can be used with further updates to perform concurrent modification checks with the next write. This is known as a conditional write.

A conditional write ensures a client can only update the object if they’ve seen the previous version of the object. The purpose is to prevent a change to the object if another client has changed the value between the first client’s read and its next write.

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curl -X PUT "http://127.0.0.1:7350/v2/storage" \
  -H 'Authorization: Bearer <session token>' \
  -d '{
    "objects": [
      {
        "collection": "saves",
        "key": "savegame",
        "value": "{\"progress\": \"50\"}",
        "version": "some-previous-version"
      }
    ]
  }'
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var save_game = { "progress": 50 };

const object_ids = await client.writeStorageObjects(session, [
  {
    "collection": "saves",
    "key": "savegame",
    "value": save_game,
    "version": "<version>"
  }
]);

console.info("Stored objects: %o", object_ids);
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var saveGame = "{ \"progress\": 50 }";

var objectIds = await client.WriteStorageObjectsAsync(session, new [] { 
  new WriteStorageObject
  {
      Collection = "saves",
      Key = "savegame",
      Value = saveGame,
      Version = "<version>"
  }
});

Console.WriteLine("Stored objects: [{0}]", string.Join(",\n  ", objectIds));
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auto successCallback = [](const NStorageObjectAcks& acks)
{
    std::cout << "Successfully stored objects " << acks.size() << std::endl;
};

std::vector<NStorageObjectWrite> objects;
NStorageObjectWrite savesObject;
savesObject.collection = "saves";
savesObject.key = "savegame";
savesObject.value = "{ \"progress\": 50 }";
savesObject.version = "<version>";
objects.push_back(savesObject);
client->writeStorageObjects(session, objects, successCallback);
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String saveGame = "{ \"progress\": 50 }";
StorageObjectWrite object = new StorageObjectWrite("saves", "savegame", saveGame, PermissionRead.OWNER_READ, PermissionWrite.OWNER_WRITE);
object.setVersion("<version>");
StorageObjectAcks acks = client.writeStorageObjects(session, object).get();
System.out.format("Stored objects %s", acks.getAcksList());
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var save_game = "{ \"progress\": 50 }"
var can_read = 1
var can_write = 1
var version = "<version>"

var acks : NakamaAPI.ApiStorageObjectAcks = yield(client.write_storage_objects_async(session, [
    NakamaWriteStorageObject.new("saves", "savegame", can_read, can_write, save_game, version)
]), "completed")

if acks.is_exception():
    print("An error occurred: %s" % acks)
    return

print("Successfully stored objects:")

for a in acks.acks:
    print("%s" % a)
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PUT /v2/storage
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
{
  "objects": [
    {
      "collection": "saves",
      "key": "key",
      "value": "{\"hello\": \"world\"}",
      "version": "<version>"
    }
  ]
}
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local save_game = json.encode({ progress = 50 })
local can_read = 1
local can_write = 1
local version = "some previous version"

local objects = {
  {
				collection = "saves",
				key = "savegame",
				permissionRead = can_read,
				permissionWrite = can_write,
				value = save_game,
				version = version,
  }
}

local result = client.write_storage_objects(objects)

if result.error then
  print(result.message)
  return
end

for _,ack in ipairs(result.acks) do
  pprint(ack)
end

We support another kind of conditional write which is used to write an object only if none already exists for that object’s collection and key.

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curl -X PUT "http://127.0.0.1:7350/v2/storage" \
  -H 'Authorization: Bearer <session token>' \
  -d '{
    "objects": [
      {
        "collection": "saves",
        "key": "savegame",
        "value": "{\"progress\": \"50\"}",
        "version": "*"
      }
    ]
  }'
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var save_game = { "progress": 50 };
const object_ids = await client.writeStorageObjects(session, [
  {
    "collection": "saves",
    "key": "savegame",
    "value": save_game,
    "version": "*"
  }
]);
console.info("Stored objects: %o", object_ids);
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var saveGame = "{ \"progress\": 50 }";

var objectIds = await client.WriteStorageObjectsAsync(session, new [] {
  new WriteStorageObject
  {
      Collection = "saves",
      Key = "savegame",
      Value = saveGame,
      Version = "*"
  }
});

Console.WriteLine("Stored objects: [{0}]", string.Join(",\n  ", objectIds));
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auto successCallback = [](const NStorageObjectAcks& acks)
{
    std::cout << "Successfully stored objects " << acks.size() << std::endl;
};

std::vector<NStorageObjectWrite> objects;
NStorageObjectWrite savesObject;
savesObject.collection = "saves";
savesObject.key = "savegame";
savesObject.value = "{ \"progress\": 50 }";
savesObject.version = *";
objects.push_back(savesObject);
client->writeStorageObjects(session, objects, successCallback);
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String saveGame = "{ \"progress\": 50 }";
StorageObjectWrite object = new StorageObjectWrite("saves", "savegame", saveGame, PermissionRead.OWNER_READ, PermissionWrite.OWNER_WRITE);
object.setVersion("*");
StorageObjectAcks acks = client.writeStorageObjects(session, object).get();
System.out.format("Stored objects %s", acks.getAcksList());
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// Requires Nakama 1.x

String saveGame = "{\"progress\": 1}";
String version = "*"; // represents "no version".

CollatedMessage<ResultSet<RecordId>> message = StorageWriteMessage.Builder.newBuilder()
    .record("myapp", "saves", "savegame", saveGame, version)
    .build();

Deferred<ResultSet<RecordId>> deferred = client.send(message);

deferred.addCallback(new Callback<ResultSet<RecordId>, ResultSet<RecordId>>() {
    @Override
    public ResultSet<RecordId> call(ResultSet<RecordId> list) throws Exception {
        // Cache updated version for next write.
        version = list.getResults().get(0).getVersion();
        return list;
    }
}).addErrback(new Callback<Error, Error>() {
    @Override
    public Error call(Error err) throws Exception {
        System.err.format("Error('%s', '%s')", err.getCode(), err.getMessage());
        return err;
    }
});
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var save_game = "{ \"progress\": 50 }"
var can_read = 1
var can_write = 1
var version = "*" # represents "no version".

var acks : NakamaAPI.ApiStorageObjectAcks = yield(client.write_storage_objects_async(session, [
    NakamaWriteStorageObject.new("saves", "savegame", can_read, can_write, save_game, version)
]), "completed")

if acks.is_exception():
    print("An error occurred: %s" % acks)
    return

print("Successfully stored objects:")

for a in acks.acks:
    print("%s" % a)
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PUT /v2/storage
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
{
  "objects": [
    {
      "collection": "saves",
      "key": "key",
      "value": "{\"hello\": \"world\"}",
      "version": "*"
    }
  ]
}
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local save_game = json.encode({ progress = 50 })
local can_read = 1
local can_write = 1
local version = "*"   -- no version


local objects = {
  {
				collection = "saves",
				key = "savegame",
				permissionRead = can_read,
				permissionWrite = can_write,
				value = save_game,
				version = version,
  }
}

local result = client.write_storage_objects(objects)

if result.error then
  print(result.message)
  return
end

for _,ack in ipairs(result.acks) do
  pprint(ack)
end

Read objects #

Just like with writing objects you can read one or more objects from the database server.

Each object has an owner and permissions. An object can only be read if the permissions allow it. An object which has no owner can be fetched with "null" and is useful for global objects which all users should be able to read.

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curl -X POST "http://127.0.0.1:7350/v2/storage" \
  -H 'Authorization: Bearer <session token>' \
  -d '{
    "object_ids": [
      {
        "collection": "saves",
        "key": "savegame",
        "user_id": "some-user-id"
      }
    ]
  }'
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const objects = await client.readStorageObjects(session, {
  "object_ids": [{
    "collection": "saves",
    "key": "savegame",
    "user_id": session.user_id
  }]
});
console.info("Read objects: %o", objects);
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var result = await client.ReadStorageObjectsAsync(session, new [] {
  new StorageObjectId {
    Collection = "saves",
    Key = "savegame",
    UserId = session.UserId
  }
});

Console.WriteLine("Read objects: [{0}]", string.Join(",\n  ", result.Objects));
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auto successCallback = [](const NStorageObjects& objects)
{
  for (auto& object : objects)
    {
        std::cout << "Object key: " << object.key << ", value: " << object.value << std::endl;
    }
};

std::vector<NReadStorageObjectId> objectIds;
NReadStorageObjectId objectId;
objectId.collection = "saves";
objectId.key = "savegame";
objectId.userId = session->getUserId();
objectIds.push_back(objectId);
client->readStorageObjects(session, objectIds, successCallback);
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StorageObjectId objectId = new StorageObjectId("saves");
objectId.setKey("savegame");
objectId.setUserId(session.getUserId());
StorageObjects objects = client.readStorageObjects(session, objectId).get();
System.out.format("Read objects %s", objects.getObjectsList().toString());
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var result : NakamaAPI.ApiStorageObjects = yield(client.read_storage_objects_async(session, [
    NakamaStorageObjectId.new("saves", "savegame", session.user_id)
]), "completed")

if result.is_exception():
    print("An error occurred: %s" % result)
    return

print("Read objects:")

for o in result.objects:
    print("%s" % o)
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POST /v2/storage
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
{
  "object_ids": [
    {
      "collection": "saves",
      "key": "savegame",
      "user_id": "some-user-id"
    }
  ]
}
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local user_id = "some user id"

local objects_ids = {
  {
				collection = "saves",
				key = "savegame",
        userId = user_id
  }
}

local result = client.read_storage_objects(objects_ids)

if result.error then
  print(result.message)
  return
end

for _,object in ipairs(result.objects) do
  pprint(object)
end

List objects #

You can list objects in a collection and page through results. The objects returned can be filter to those owned by the user or "null" for public records which aren’t owned by a user.

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curl -X GET "http://127.0.0.1:7350/v2/storage/saves?user_id=some-user-id&limit=10" \
  -H 'Authorization: Bearer <session token>'
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const limit = 100; // default is 10.
const objects = await client.listStorageObjects(session, "saves", session.user_id, limit);
console.info("List objects: %o", objects);
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const int limit = 100; // default is 10.
var result = await client.ListUsersStorageObjectsAsync(session, "saves", session.UserId, limit);
Console.WriteLine("List objects: {0}", result);
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auto successCallback = [](NStorageObjectListPtr list)
{
    for (auto& object : list->objects)
    {
        std::cout << "Object key: " << object.key << ", value: " << object.value << std::endl;
    }
};
client->listUsersStorageObjects(session, "saves", session->getUserId(), opt::nullopt, opt::nullopt, successCallback);
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StorageObjectList objects = client.listUsersStorageObjects(session, "saves", session.getUserId()).get();
System.out.format("List objects %s", objects);
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var limit = 100 # default is 10.
var objects : NakamaAPI.ApiStorageObjectList = yield(client.list_storage_objects_async(session, "saves", session.user_id, limit), "completed")

if objects.is_exception():
  print("An error occurred: %s" % objects)
  return

print("List objects: %s" % objects)
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GET /v2/storage/<collection>?user_id=<user_id>&limit=<limit>&cursor=<cursor>
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
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local user_id = "some user id"
local limit = 10
local result = client.list_storage_objects("saves", user_id, limit)

if result.error then
  print(result.message)
  return
end

for _,object in ipairs(result.objects) do
  pprint(object)
end

Remove objects #

A user can remove an object if it has the correct permissions and they own it.

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curl -X PUT "http://127.0.0.1:7350/v2/storage/delete" \
  -H 'Authorization: Bearer <session token>' \
  -d '{
    "object_ids": [
      {
        "collection": "saves",
        "key": "savegame"
      }
    ]
  }'
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await client.deleteStorageObjects(session, {
  "object_ids": [{
    "collection": "saves",
    "key": "savegame"
  }]
});
console.info("Deleted objects.");
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var result = await client.DeleteStorageObjectsAsync(session, new [] {
  new StorageObjectId {
    Collection = "saves",
    Key = "savegame"
  }
});

Console.WriteLine("Deleted objects.");
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auto successCallback = []()
{
    std::cout << "Deleted objects." << std::endl;
};

std::vector<NDeleteStorageObjectId> objectIds;
NDeleteStorageObjectId objectId;
objectId.collection = "saves";
objectId.key = "savegame";
objectIds.push_back(objectId);
client->deleteStorageObjects(session, objectIds, successCallback);
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StorageObjectId objectId = new StorageObjectId("saves");
objectId.setKey("savegame");
client.deleteStorageObjects(session, objectId).get();
System.out.format("Deleted objects.");
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var del : NakamaAsyncResult = yield(client.delete_storage_objects_async(session, [
  NakamaStorageObjectId.new("saves", "savegame")
]), "completed")

if del.is_exception():
  print("An error occurred: %s" % del)
  return

print("Deleted objects.")
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PUT /v2/storage/delete
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
{
  "object_ids": [
    {
      "collection": "saves",
      "key": "savegame"
    }
  ]
}
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local objects_ids = {
  {
				collection = "saves",
				key = "savegame"
  }
}

local result = client.delete_storage_objects(object_ids)

if result.error then
  print(result.message)
  return
end

You can also conditionally remove an object if the object version matches the version sent by the client.

Client
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curl -X PUT \
  http://127.0.0.1:7350/v2/storage/delete \
  -H 'Authorization: Bearer <session token>' \
  -d '{
    "object_ids": [
      {
        "collection": "saves",
        "key": "savegame",
        "version": "<version>"
      }
    ]
  }'
Client
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await client.deleteStorageObjects(session, {
  "object_ids": [{
    "collection": "saves",
    "key": "savegame",
    "version": "<version>"
  }]
});
console.info("Deleted objects.");
Client
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var result = await client.DeleteStorageObjectsAsync(session, new [] {
  new StorageObjectId {
    Collection = "saves",
    Key = "savegame",
    UserId = session.UserId,
    Version = "<version>"
  }
});

Console.WriteLine("Deleted objects.");
Client
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auto successCallback = []()
{
    std::cout << "Deleted objects." << std::endl;
};

std::vector<NDeleteStorageObjectId> objectIds;
NDeleteStorageObjectId objectId;
objectId.collection = "saves";
objectId.key = "savegame";
objectId.version = "<version>";
objectIds.push_back(objectId);
client->deleteStorageObjects(session, objectIds, successCallback);
Client
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StorageObjectId objectId = new StorageObjectId("saves");
objectId.setKey("savegame");
objectId.setVersion("<version>");
client.deleteStorageObjects(session, objectId).get();
System.out.format("Deleted objects.");
Client
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var del = yield(client.delete_storage_objects_async(session, [
  NakamaStorageObjectId.new("saves", "savegame", session.user_id, "<version>")
]), "completed")

if del.is_exception():
  print("An error occurred: %s" % del)
  return

print("Deleted objects.")
Client
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PUT /v2/storage/delete
Host: 127.0.0.1:7350
Accept: application/json
Content-Type: application/json
Authorization: Bearer <session token>
{
  "object_ids": [
    {
      "collection": "saves",
      "key": "savegame",
      "version": "<version>"
    }
  ]
}
Client
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local objects_ids = {
  {
				collection = "saves",
				key = "savegame",
        version = "some version"
  }
}

local result = nakama.delete_storage_objects(object_ids)

if result.error then
  print(result.message)
  return
end

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