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NeoGo Oracle service

NeoGo node can act as an oracle service node for https and neofs protocols. It has to have a wallet with a key belonging to one of the network's designated oracle nodes (stored in RoleManagement native contract).

It needs RPC service to be enabled and configured properly because RPC is used by oracle nodes to exchange signatures of the resulting transaction.

Configuration

To enable oracle service, add Oracle subsection to ApplicationConfiguration section of your node config.

Parameters:

  • Enabled: boolean value, enables/disables the service, true for service to be enabled
  • AllowPrivateHost: boolean value, enables/disables private IPs (like 127.0.0.1 or 192.168.0.1) for https requests, it defaults to false and it's false on public networks, but you can enable it for private ones.
  • AllowedContentTypes: a list of allowed MIME types. Only application/json is allowed by default. Can be left empty to allow everything.
  • Nodes: a list of oracle node RPC endpoints, it's used for oracle node communication. All oracle nodes should be specified there.
  • NeoFS: a subsection of its own for NeoFS configuration with two parameters:
    • Timeout: request timeout, like "5s"
    • Nodes: a list of NeoFS nodes (their gRPC interfaces) to get data from, one node is enough to operate, but they're used in round-robin fashion, so you can spread the load by specifying multiple nodes
  • MaxTaskTimeout: maximum time a request can be active (retried to process), defaults to 1 hour if not specified.
  • RefreshInterval: retry period for requests that aren't yet processed, defaults to 3 minutes.
  • MaxConcurrentRequests: maximum number of requests processed in parallel, defaults to 10.
  • RequestTimeout: https request timeout, default is 5 seconds.
  • ResponseTimeout: RPC communication timeout for inter-oracle exchange, default is 4 seconds.
  • UnlockWallet: oracle wallet configuration:
    • Path: path to NEP-6 wallet.
    • Password: password for the account to be used by oracle node.

Example

  Oracle:
    Enabled: true
    AllowPrivateHost: false
    MaxTaskTimeout: 432000000s
    Nodes:
      - http://oracle1.example.com:20332
      - http://oracle2.example.com:20332
      - http://oracle3.example.com:20332
      - http://oracle4.example.com:20332
    NeoFS:
      Nodes:
        - st1.storage.fs.neo.org:8080
        - st2.storage.fs.neo.org:8080
        - st3.storage.fs.neo.org:8080
        - st4.storage.fs.neo.org:8080
    UnlockWallet:
      Path: "/path/to/oracle-wallet.json"
      Password: "dontworryaboutthevase"

Operation

To run oracle service on your network, you need to:

  • set oracle node keys in RoleManagement contract
  • configure and run an appropriate number of oracle nodes with keys specified in RoleManagement contract