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extensions.md

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Extensions

Extensions mechanism allows creating complex user scenarios, especially in case of customized setups or permissioned networks.

Extension developer's guide:

  • Create new NetCore 3.1 library project in VisualStudio.
  • Add references to Centaurus.Domain and Centaurus.Common projects.
  • Implement IExtension interface from Centaurus.Domain project.
  • Subscribe to one or more events of Global.ExtensionsManager instance.
  • Create an extension configuration file and place the extension dll file to the same folder.
  • Specify the path to the extension config file using --extensions_config_file_path path-to-config param while starting Alpha and auditors.

Config file

Config is a json file with only one (for now) property:

  • extensions (Array<ExtensionItem>) - Array of extension items.

Each extension item consists of:

  • name (string) - This is dll name without dll extension. The extension engine will look for a library with this name.
  • isDisabled (bool) - You can disable extension by setting this property to true. Default value is false.
  • extensionConfig (object) - Config for the extension – plain string key-value pairs. This object will be deserialized as Dictionary<string, string> and passed to IExtension.Init method.

Extension points

All events are executed synchronously within client connection (not blocking other connections or affecting quantum processing), except OnBeforeQuantumHandle and OnAfterQuantumHandle – these two events are executed synchronously in the context of the entire quantum processing pipeline.

Events Arguments
OnNewConnection WebSocket webSocket, string ip
OnConnectionValidated BaseWebSocketConnection connection
OnBeforeValidateMessage BaseWebSocketConnection connection, MessageEnvelope message
OnAfterValidateMessage BaseWebSocketConnection connection, MessageEnvelope message
OnBeforeHandleMessage BaseWebSocketConnection connection, MessageEnvelope message
OnAfterHandleMessage BaseWebSocketConnection connection, MessageEnvelope message
OnHandleMessageFailed BaseWebSocketConnection connection, MessageEnvelope message, Exception exception
OnBeforeSendMessage BaseWebSocketConnection connection, MessageEnvelope message
OnAfterSendMessage BaseWebSocketConnection connection, MessageEnvelope message
OnSendMessageFailed BaseWebSocketConnection connection, MessageEnvelope message, Exception exception
OnBeforeConnectionClose BaseWebSocketConnection connection
OnBeforeNotify RawPubKey pubKey, MessageEnvelope envelope
OnBeforeNotifyAuditors MessageEnvelope envelope
OnBeforeQuantumHandle MessageEnvelope quantum
OnAfterQuantumHandle ResultMessage resultMessage