Slots server

Slots games server. Releases functionality for Megajack, Novomatic, NetEnt, BetSoft, and some others providers of slot games. Has built-in reels scanner and the sets of reels on different RTP for each game.

Server provides HTTP-based API for popular slots and have well-optimized performance for thousands requests per second. Can be deployed on dedicated server or as portable application for Linux or Windows.

total: 121 games, 60 algorithms, 9 providers
AGT: 39 games
Aristocrat: 4 games
BetSoft: 3 games
Megajack: 3 games
NetEnt: 20 games
Novomatic: 38 games
Play'n GO: 3 games
Playtech: 7 games
Slotopol: 4 games

How to build from sources

Note: you can download the compiled binaries for Windows at release section, or build docker image by dockerfile.

1. Install Golang of last version.
2. Clone project and download dependencies.
3. Build project with script at task directory.

For Windows command prompt:

git clone https://github.com/slotopol/server.git
cd server
go mod download && go mod verify
task\build-win-x64.cmd

or for Linux shell or git bash:

git clone https://github.com/slotopol/server.git
cd server
go mod download && go mod verify
sudo chmod +x ./task/*.sh
./task/build-linux-x64.sh

Then web-service can be started:

slot_win_x64 web

The list of all provided games can be obtained by command:

slot_win_x64 list --all

How to test workflow

Build bot as it described, and run some scripts at script folder of project. See readme for details.

Architecture and logic

Database. Service instance oriented on monopoly usage of it's database. It reads necessary database tables on start and avoids any select requests at all. Then it stores to database only changes and new data (update & insert). Those queries are buffered across API endpoints calls to increase performance with database conversations.

It can be used embedded sqlite database engine or MySQL database, its configured at slot-app.yaml settings file, and by default sqlite is used. Embedded sqlite engine useful for instance started on portable storage, same as flash drive or external SSD, and can serve small sets of players, 50-500 players at the same time. For big number of players it should be used dedicated server with MySQL.

Clubs. There is can be served several clubs. Each club have its own undepended bank, jackpot fund with rate to this fund from spins, and deposit. Bank of club is current balance of club to which arrives coins from users spins, and from which they gets a wins. There is exist linkage of users wins to bank: if bank have not enough coins to pay the win during users spins, this win combination will be skipped. Deposit of club does not used in games, it can be useful to transfer the coins from bank to fix the yield.

Users accounts. Accounts have registrations data only. Each account can be associated with several clubs. Each user can have properties for each club with individual balance to gamble, individual access rights, and individual master RTP to choose reels at games.

Each user can play several games at the same time. Each started game have game ID related to user ID and club ID. Any game actions ties to game ID.

How to use HTTP API

Any API endpoints can receive data in JSON, XML, YAML, or TOML format, depended by Content-Type header. If Content-Type header not given, JSON will be used to decode as default. Accept header if it given, defines response data format. If it absent, same format as at request will be used.

In most cases used POST-method of HTTP.

If any response have HTTP status >= 400, body in this case contains error object with what field with message and unique source point error code.

Without authorization

First of all you can get a list of games supported by server. This call can be without authorization.

curl -X GET localhost:8080/gamelist

Response has array with available algorithms descriptions. Each structure has a list of games aliases, that shares one algorithm. Field rtp has the list of reels with predefined RTP. There is example of structure with info:

{"aliases":[{"prov":"NetEnt","name":"Trolls"},{"prov":"NetEnt","name":"Excalibur"},{"prov":"NetEnt","name":"Pandora's Box"},{"prov":"NetEnt","name":"Wild Witches"}],"gp":865,"sx":5,"sy":3,"sn":14,"ln":20,"rtp":[87.788791,89.230191,91.925079,93.061471,93.903358,95.183523,96.6485,98.193276,101.929305,110.298257]}

/ping, /servinfo and /memusage, /signis, /sendcode, /activate, /signup and /signin endpoints also does not expects authorization.

Authorization

There is supported basic authorization and bearer authorization (with JWT-tokens). Authorization data can be provided by 4 ways: in header Authorization, at query parameters, at cookies, and at post form.

Basic expects credentials pair email:password encoded in unpadded base64 encoding for URL (see RFC 4648).

Bearer works with two HS256 JWT tokens - access token and refresh token. Access token should be provided in all cases except refresh call. When access-token expires, it should be replaced to refresh-token for refresh-call.

In /signin call password can be given by two ways:

1. Explicitly at field secret as is.
2. By HMAC SHA256 hash and temporary public key (without send opened secret).

In second case it should be string in field sigtime with current time formatted in RFC3339 (can be with nanoseconds). And at field hs256 it should be hexadecimal HMAC formed with algorithm SHA256 with this current time as a key, and password, i.e. sha256.hmac(sigtime, password). Allowed timeout for public key is 2m 30s.

• Sign-in, and use token from response with any followed calls.

curl -H "Content-Type: application/json" -d '{"email":"[email protected]","secret":"iVI05M"}' -X POST localhost:8080/signin

You can use token eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzbG90b3BvbCIsImV4cCI6NDg2NzQ0NzYxNywibmJmIjoxNzA2NjQ3NjE3LCJ1aWQiOjN9.6g2Hig9ErG8IbvzkPppry5F8HJsMunZPwuQzmetGh4c for test purpose, it given for user with UID=3 on 100 years. Replace {{token}} at samples below to this value.

• When your access token expires (you can get response with 401 status code), use refresh-call with refresh-token to get new tokens pair.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -X GET localhost:8080/refresh

Join and play the game

• Join to game. GID received at response will be used at all calls for access to this game instance. Also you will get initial game state, and user balance at this club.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"cid":1,"uid":3,"alias":"Novomatic/Joker Dolphin"}' -X POST localhost:8080/game/join

Endpoint receives alias identifier to game that represents as concatenation of provider name and game name with slash. For example, NetEnt/Tiki Wonders. Whole list of all supported games can be obtained by list command. Identifier turns to lowercase without spaces.

• Change number of selected bet lines.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"gid":1,"sel":5}' -X POST localhost:8080/slot/sel/set

• Make a spin. Spin returns sid - spin ID, by this ID it can be found at the log; screen with new symbols after spin; wins with list of win on each line if it was; fs - free spins remained; gain - total gain after spin, that can be gambled on double up; wallet - user balance after spin with won coins.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"gid":1}' -X POST localhost:8080/slot/spin

• Double-up. If presents gain after spin, it can be multiplied by gamble. mult at argument is multiplier, and it will be 2 for red-black cards game. Returned gain will be multiplied on win, and zero on lose. wallet represents new balance of user.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"gid":1,"mult":2}' -X POST localhost:8080/slot/doubleup

• Collect the gain. After win on spin, or after double-up gain can be collected. In most cases it will be collected automatically on new spin.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"gid":1}' -X POST localhost:8080/slot/collect

• Get information about current game scene.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"gid":1}' -X POST localhost:8080/game/info

• Part game.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"gid":1}' -X POST localhost:8080/game/part

Work with user account

• Check up user account existence. It can be done by email or user identifier (uid parameter). Call returns true uid and email if account is found, or zero user identifier if account does not registered.

curl -X GET localhost:8080/signis?[email protected]

• Register new user. E-mail and secret key (password) are expected, name can be omitted. Receives user ID on success.

curl -H "Content-Type: application/json" -d '{"email":"[email protected]","secret":"LtpkAr","name":"rob"}' -X POST localhost:8080/signup

After registration new user account expects account activation by code sent to user email. Activation can be done by /activate endpoint call. If registration of new user was done with admin token, this new user account does not expects activation.

• Activate new user account. It can be done by code sent to user account email. Activation should be done in 15 minutes timeout after registration. If timeout expired activation can be done with new code, sent to email by /sendcode endpoint call.

curl -X GET localhost:8080/activate?uid=3&code=048814

Instead uid parameter with user identifier can be used user email. If activation endpoint was called with admin token, activation code have no matter.

• Send new activation code to user email.

curl -X GET localhost:8080/sendcode?uid=3

Instead uid parameter with user identifier can be used user email.

• Rename user.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"uid":3,"name":"erigone"}' -X POST localhost:8080/user/rename

• Change secret key.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"uid":3,"oldsecret":"iVI05M","newsecret":"pGjKsd"}' -X POST localhost:8080/user/secret

• Delete user. Delete-call removes account from database, move all remained user's coins to deposit, and removes all users games from database.

curl -H "Content-Type: application/json" -H "Authorization: Bearer {{token}}" -d '{"uid":3,"secret":"iVI05M"}' -X POST localhost:8080/user/delete

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