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Edgegap's integration for Nakama using the Fleet Manager

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# Nakama <> Edgegap Integration

Deploy Dedicated Game Servers for popular engines (e.g., Unity, Unreal, etc.) or custom engine servers, fully integrated with Nakama's open-source player data and game services for a convenient turnkey solution.

## Edgegap Setup

To prepare your dedicated game server build for deployment on Edgegap, see:
- [Getting Started with Servers (Unity)](https://docs.edgegap.com/learn/unity-games/getting-started-with-servers)
- [Getting Started with Servers (Unreal Engine)](https://docs.edgegap.com/learn/unreal-engine-games/getting-started-with-servers)

## Installation

To add the Edgegap Fleet Manager to your Nakama go plugin project, use the following command:
```shell
go get github.com/edgegap/nakama-edgegap
```

This will add it to your project's `go.mod` dependencies.

## Nakama Setup

You must set up the following Environment Variable inside your Nakama's cluster:
```shell
EDGEGAP_API_URL=https://api.edgegap.com
EDGEGAP_API_TOKEN=<The Edgegap's API Token (keep the 'token' in the API Token)>
EDGEGAP_APPLICATION=<The Edgegap's Application Name to use to deploy>
INITIAL_EDGEGAP_VERSION=<Initial version to use when no version exists in storage>
EDGEGAP_PORT_NAME=<The Edgegap's Application Port Name to send to game client>
NAKAMA_ACCESS_URL=<Nakama API Url, for Heroic Cloud, it will be provided when you create your instance>
```

You can copy the `local.yml.example` to `local.yml` and fill it out to start with your local cluster

Make sure the `NAKAMA_ACCESS_URL` is prefixed with `https://`.

Optional Values with default
```shell
EDGEGAP_POLLING_INTERVAL=<Interval where Nakama will sync with Edgegap API in case of mistmach (default:15m ) >
NAKAMA_CLEANUP_INTERVAL=<Interval where Nakama will check reservations expiration (default:1m )
NAKAMA_RESERVATION_MAX_DURATION=<Max Duration of a reservations before it expires (default:30s )
```

If `EDGEGAP_POLLING_INTERVAL` or `NAKAMA_CLEANUP_INTERVAL` are set to empty values or 0, the corresponding background workers are disabled entirely. This can be useful for testing purposes but is not recommended for production setting.

### Version Management

The plugin stores deployment versions in Nakama's storage, allowing you to update the Edgegap deployment version at runtime without restarting services. The version can be updated via Server-to-Server (S2S) RPCs.

On startup, if no version exists in storage and `INITIAL_EDGEGAP_VERSION` is set, the plugin will automatically store this initial version for immediate use

#### Update Version (S2S only)
Updates the Edgegap deployment version after validating it exists in the Edgegap application.

```bash
curl -X POST http://localhost:7350/v2/rpc/update_edgegap_version?http_key=<http-key>&unwrap \
  -H "Content-Type: application/json" \
  -d '{"version": "your-version-here"}'
```

Success Response:
```json
{
  "success": true,
  "version": "your-version-here",
  "message": "Edgegap version updated successfully. Will be used for new deployments immediately."
}
```

Error Response (invalid version):
```json
{
  "code": 5,
  "message": "version 'invalid-version' does not exist for application 'YourApp'"
}
```

#### Get Current Version (S2S only)
```bash
curl -X POST http://localhost:7350/v2/rpc/get_edgegap_version?http_key=<http-key>&unwrap \
  -H "Content-Type: application/json" \
  -d '{}'
```

Response:
```json
{
  "version": "your-version-here",
  "source": "dynamic",
  "updated_at": 1735844393
}
```

Response (no version set):
```json
{
  "error": "No Edgegap version configured",
  "message": "Please set version using update_edgegap_version RPC"
}
```

**Note**: Both RPCs require HTTP key authentication and cannot be called by game clients.

Using the Nakama's Storage Index and basic struct Instance Info,
we store extra information in the metadata for Edgegap using 2 list.
1 list to holds seats reservations
1 list to holds active connections

Using Max Players field we can now create the field `AvailableSeats` that will be in sync with that (
MaxPlayers-Reservations-Connections=AvailableSeats)

## Usage

From your `main.go` where the `InitModule` global function is, you need to register the Fleet Manager

```go
// Register the Fleet Manager
efm, err := fleetmanager.NewEdgegapFleetManager(ctx, logger, db, nk, initializer)
if err != nil {
    return err
}

if err = initializer.RegisterFleetManager(efm); err != nil {
    logger.WithField("error", err).Error("failed to register Edgegap fleet manager")
    return err
}
```

You can use the `main.go` from this project and also copy the `local.yml.example` to start a local Nakama using docker compose.

copy `docker-compose.yml` and `Dockerfile` to the root of your project and run the following command to start a local cluster:
```shell
docker compose up --build -d
```

Run the following command to stop it
```shell
docker compose down
```

## Server Placement

Game clients only interact with Edgegap APIs through Nakama RPCs, defaulting to [Nakama authentication method of your choice](https://heroiclabs.com/docs/nakama/concepts/authentication/). [Edgegap's Server Placement utilizing Server Score strategy](https://docs.edgegap.com/learn/advanced-features/deployments#1-server-score-strategy-best-practice) uses public IP addresses of participating players to choose the optimal server location. To store the player IP address and pass it to Edgegap when looking for server, store player's public IP in their Profile's Metadata as `PlayerIP`.

In your `main.go`, during the Init you can add the Registration of the Authentication of the type you implemented

```go
    // Register Authentication Methods
    if err := initializer.RegisterAfterAuthenticateCustom(fleetmanager.OnAuthenticateUpdateCustom); err != nil {
        return err
    }
```

This will automatically store in Profile's Metadata the `PlayerIP`

## Dedicated Game Server -> Nakama Instance

When using this integration, every Deployment (Dedicated Game Server) made through Edgegap's platform will have many Environment Variables
injected.

It's the responsibility of the Dedicated Game Server to fire lifecycle events when specific actions are triggered to communicate
back to Nakama's cluster changes regarding the Instance (Nakama's reference to an Edgegap Deployment) and facilitate Player connections to
the Dedicated Game Server.

### Unity Server Plugin

Automate all server responsibilities (instance and connection event reporting) by using our
[Edgegap Server Nakama Plugin for Unity](https://github.com/edgegap/edgegap-server-nakama-plugin-unity).

### Injected Environment Variables

The following Environment Variables will be available in the Dedicated Game Server:

- `NAKAMA_CONNECTION_EVENT_URL` (url to send connection events of the players)
- `NAKAMA_INSTANCE_EVENT_URL` (url to send instance event actions)
- `NAKAMA_INSTANCE_METADATA` (contains create metadata JSON)

### Connection Events

Using `NAKAMA_CONNECTION_EVENT_URL` you must send Player Connection events to the Nakama Instance with the following body:

```json
{
  "instance_id": "<instance_id>",
  "connections": [
    "<user_id>"
  ]
}
```

`connections` is the list of active user IDs connected to the Dedicated Game Server. We recommend collecting updates
over a short period of time (~5 seconds) and updating the full list of connections in a batch request. Contents of
this request will overwrite any existing list of connections for the specified instance.

### Instance Events

Using `NAKAMA_INSTANCE_EVENT_URL` you must send Instance events to the Nakama Instance with the following body:

```json
{
  "instance_id": "<instance_id>",
  "action": "[READY|ERROR|STOP]",
  "message": "",
  "metadata": {}
}
```

`action` must be one of the following:

- `READY` will mark the instance as ready and trigger Nakama callback event to notify players,
- `ERROR` will mark the instance in error and trigger Nakama callback event to notify players,
- `STOP` will call Edgegap's API to stop the running deployment, which will be removed from Nakama once Edgegap confirms termination.

`message` can be used optionally to provide extra Instance status information (e.g. to communicate Errors).

`metadata` can be used optionally to merge additional custom key-value information available in Dedicated Game Server to the metadata of the Instance.

## Game Client -> Nakama (optional rpc)

We included a Client RPC route to do basic operations on Instance - listing, creating, and joining. Consider this an optional starter code sample.
For production/live use cases, we recommend using a matchmaker for added security and flexibility.

### Create Instance

RPC - instance_create

```json
{
  "max_players": 2,
  "user_ids": [],
  "metadata": {}
}
```

`max_players` to -1 for unlimited. Use with caution, we recommend performing a benchmark for server resource usage impact.

If `user_ids` is empty, the requesting user's ID will be used.

### Get Instance

RPC - instance_get

```json
{
  "instance_id": "<instance_id>"
}
```

### List Instance

RPC - instance_list

```json
{
  "query": "",
  "limit": 100,
  "cursor": ""
}
```

`query` can be used to search instance with available seats.

Example to list all instances READY with at least 1 seat available.

```json
{
  "query": "+value.metadata.edgegap.available_seats:>=1 +value.status:READY",
  "limit": 100,
  "cursor": ""
}

```

### Join Instance

RPC - instance_join

```json
{
  "instance_id": "<instance_id>",
  "user_ids": []
}
```

If `user_ids` is empty, the requesting user's ID will be used.

## Matchmaker

You can create your own integration using Nakama's Matchmaker, see our starter code sample:

```go
// OnMatchmakerMatched When a match is created via matchmaker, collect the Users and create a instance
func OnMatchmakerMatched(ctx context.Context, logger runtime.Logger, db *sql.DB, nk runtime.NakamaModule, entries []runtime.MatchmakerEntry) (string, error) {
	maxPlayers := len(entries)
	userIds := make([]string, 0, len(entries))
	for _, entry := range entries {
		userIds = append(userIds, entry.GetPresence().GetUserId())
	}
	
	var callback runtime.FmCreateCallbackFn = func(status runtime.FmCreateStatus, instanceInfo *runtime.InstanceInfo, sessionInfo []*runtime.SessionInfo, metadata map[string]any, createErr error) {
		switch status {
		case runtime.CreateSuccess:
			logger.Info("Edgegap instance created: %s", instanceInfo.Id)

content := map[string]interface{}{
				"IpAddress":  instanceInfo.ConnectionInfo.IpAddress,
				"DnsName":    instanceInfo.ConnectionInfo.DnsName,
				"Port":       instanceInfo.ConnectionInfo.Port,
				"InstanceId": instanceInfo.Id,
			}
			// Send connection details notifications to players
			for _, userId := range userIds {
				subject := "connection-info"

code := notificationConnectionInfo
				err := nk.NotificationSend(ctx, userId, subject, content, code, "", false)
				if err != nil {
					logger.WithField("error", err.Error()).Error("Failed to send notification")
				}
			}
			return
		case runtime.CreateTimeout:
			logger.WithField("error", createErr.Error()).Error("Failed to create Edgegap instance, timed out")

// Send notification to client that instance session creation timed out
			for _, userId := range userIds {
				subject := "create-timeout"
				content := map[string]interface{}{}
				code := notificationCreateTimeout
				err := nk.NotificationSend(ctx, userId, subject, content, code, "", false)
				if err != nil {
					logger.WithField("error", err.Error()).Error("Failed to send notification")
				}
			}
		default:
			logger.WithField("error", createErr.Error()).Error("Failed to create Edgegap instance")

// Send notification to client that instance session couldn't be created
			for _, userId := range userIds {
				subject := "create-failed"
				content := map[string]interface{}{}
				code := notificationCreateFailed
				err := nk.NotificationSend(ctx, userId, subject, content, code, "", false)
				if err != nil {
					logger.WithField("error", err.Error()).Error("Failed to send notification")
				}
			}
			return
		}
	}
	
	efm := nk.GetFleetManager()
	err := efm.Create(ctx, maxPlayers, userIds, nil, nil, callback)

reply := instanceCreateReply{
		Message: "Instance Created",
		Ok:      true,
	}

replyString, err := json.Marshal(reply)
	if err != nil {
		logger.WithField("error", err.Error()).Error("failed to marshal instance create reply")
		return "", ErrInternalError
	}

return string(replyString), err
}
```

Register `OnMatchmakerMatched` callback like this in the `InitModule` function in your `main.go`:

```go
err = initializer.RegisterMatchmakerMatched(OnMatchmakerMatched)
if err != nil {
    logger.WithField("error", err).Error("failed to register Matchmaker matched with fleet manager")
    return err
}
```

## Testing

### Test Scripts
The `scripts/windows/` directory contains Windows batch scripts for testing the version management feature locally.

Quick start:
```bash
# Start the environment
docker compose up -d

# Get current version
./scripts/windows/test_get_version.bat

# Update version
./scripts/windows/test_update_version.bat "v1.0.0"
```

See [scripts/README.md](scripts/README.md) for detailed usage instructions.

## Support and Troubleshooting

For Edgegap-related questions and reports, please reach out to us over our [Community Discord](http://discord.gg/MmJf8fWjnt) and include your deployment ID if possible.

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