docs/Flowchart

[kadoshita]

graph TD
    Start --> STUN_MESSAGE_CHECK{Is STUN Message?};
    STUN_MESSAGE_CHECK --> |No| CHANNEL_NUMBER_CHECK{Has Channel Number?};
    CHANNEL_NUMBER_CHECK --> |Yes| SEND_APP_DATA_TO_PEER[Send Application Data to peer];
    CHANNEL_NUMBER_CHECK --> |No| FROM_PEER_CHECK{Receive From Peer?};
    FROM_PEER_CHECK --> |Yes| HAS_CHANNEL_NUMBER_CHECK{Has Channel Number?};
    HAS_CHANNEL_NUMBER_CHECK --> |Yes| SEND_CHANNEL_DATA_TO_CLIENT[Send Channel Data to client];
    HAS_CHANNEL_NUMBER_CHECK --> |No| SEND_DATA_INDICATE_TO_CLIENT[Send Data Indication to client];
    FROM_PEER_CHECK --> |No| UNKNOWN_DATA[Unknown Data];
    STUN_MESSAGE_CHECK --> |Binding Request| SEND_BIDING_RESPONSE[Send Binding Success/Error Response];
    STUN_MESSAGE_CHECK --> |Allocate Request| IS_CORRECT_USER_CHECK{Is Correct User?};
    IS_CORRECT_USER_CHECK --> |Yes| STORE_CLIENT_ENDPOINT[Store client endpoint];
    IS_CORRECT_USER_CHECK --> |No| SEND_ALLOCATE_ERROR_RESPONSE[Send Allocate Error Respoinse];
    STORE_CLIENT_ENDPOINT --> SEND_ALLOCATE_SUCCESS_RESPONSE[Send Allocate Success Response];
    STUN_MESSAGE_CHECK --> |Create Permission Request| IS_CLIENT_ENDPOINT_STORED_CHECK{Is client endpoint stored?};
    IS_CLIENT_ENDPOINT_STORED_CHECK --> |YES| STORE_PEER_ENDPOINT[Store peer endpoint];
    IS_CLIENT_ENDPOINT_STORED_CHECK --> |No| SEND_CREATE_PERMISSION_ERROR_RESPONSE[Send Create Permission Error Response];
    STORE_PEER_ENDPOINT --> SEND_CREATE_PERMISSION_SUCCESS_RESPONSE[Send Create Permission Success Response];
    STUN_MESSAGE_CHECK --> |Refresh Request| LIFETIME_ZERO_CHECK{Lifetime is 0?};
    LIFETIME_ZERO_CHECK --> |Yes| TERMINATE_CONNECTION[Terminate Connection];
    LIFETIME_ZERO_CHECK --> |No| SEND_REFRESH_RESPONSE[Send Refresh Success/Error Response];
    STUN_MESSAGE_CHECK --> |Channel Bind Request| STORE_CHANNEL_NUMBER_AND_PEER_ENDPOINT[Store Channel Number and Peer endpoint];
    STORE_CHANNEL_NUMBER_AND_PEER_ENDPOINT --> SEND_CHANEL_BIND_RESPONSE[Send Channel Bind Success/Error Response];
    STUN_MESSAGE_CHECK --> |Send Indicate| HAS_PERMISSION_CHECK{Has Permission?};
    HAS_PERMISSION_CHECK --> |Yes| P[Send Application Data to peer];
    HAS_PERMISSION_CHECK --> |No| UNKNOWN_DATA[Unknown Data];

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[kadoshita]

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graph TD
    Start --> HAS_STORED_CHANNEL_NUMBER_CHECK{Has stored Channel Number?};
    HAS_STORED_CHANNEL_NUMBER_CHECK --> |Yes| SEND_APP_DATA_TO_PEER[Send Application Data to peer];
    HAS_STORED_CHANNEL_NUMBER_CHECK --> |No| IS_RECEIVED_FROM_PEER{Is received from peer?};
    IS_RECEIVED_FROM_PEER --> |Yes| IS_CHANNEL_NUMBER_STORED_CHECK{Is channel number stored?};
    IS_CHANNEL_NUMBER_STORED_CHECK --> |Yes| SEND_CHANNEL_DATA_TO_CLIENT[Send Channel Data to client];
    IS_CHANNEL_NUMBER_STORED_CHECK --> |NO| SEND_DATA_INDICATE_TO_CLIENT[Send Data Indication to client];
    IS_RECEIVED_FROM_PEER --> |No| STUN_MESSAGE_CHECK{Is STUN Message?};    
    STUN_MESSAGE_CHECK --> |Send Indicate| IS_CLIENT_AND_PEER_STORED_CHECK{Is client and peer stored?};
    IS_CLIENT_AND_PEER_STORED_CHECK --> |Yes| SEND_APP_DATA_TO_PEER[Send Application Data to peer];
    IS_CLIENT_AND_PEER_STORED_CHECK --> |No| UNKNOWN_DATA[Unknown Data];
    STUN_MESSAGE_CHECK --> |Binding Request| SEND_BIDING_RESPONSE[Send Binding Success/Error Response];
    STUN_MESSAGE_CHECK --> |Allocate Request| IS_CORRECT_USER_CHECK{Is Correct User?};
    IS_CORRECT_USER_CHECK --> |Yes| STORE_CLIENT[Store client];
    STORE_CLIENT --> SEND_ALLOCATE_SUCCESS_RESPONSE[Send Allocate Success Response];
    IS_CORRECT_USER_CHECK --> |No| SEND_ALLOCATE_ERROR_RESPONSE[Send Allocate Error Respoinse];
    STUN_MESSAGE_CHECK --> |Create Permission Request| IS_CLIENT_STORED_CHECK1{Is client stored?};
    IS_CLIENT_STORED_CHECK1 --> |YES| STORE_PEER[Store peer];
    STORE_PEER --> SEND_CREATE_PERMISSION_SUCCESS_RESPONSE[Send Create Permission Success Response];
    IS_CLIENT_STORED_CHECK1 --> |No| SEND_CREATE_PERMISSION_ERROR_RESPONSE[Send Create Permission Error Response];
    STUN_MESSAGE_CHECK --> |Refresh Request| LIFETIME_ZERO_CHECK{Lifetime is 0?};
    LIFETIME_ZERO_CHECK --> |Yes| TERMINATE_CONNECTION[Terminate Connection];
    LIFETIME_ZERO_CHECK --> |No| SEND_REFRESH_RESPONSE[Send Refresh Success/Error Response];
    STUN_MESSAGE_CHECK --> |Channel Bind Request| IS_CLIENT_STORED_CHECK2{Is client stored?};
    IS_CLIENT_STORED_CHECK2 --> |Yes| STORE_CHANNEL_NUMBER_AND_PEER[Store Channel Number and Peer];
    STORE_CHANNEL_NUMBER_AND_PEER --> SEND_CHANEL_BIND_SUCCESS_RESPONSE[Send Channel Bind Success Response];
    IS_CLIENT_STORED_CHECK2 --> |No| SEND_CHANNEL_BIND_ERROR_RESPONSE[Send Channel Bind Error Response];

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