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Context Dependency Map

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Roles​

  • Context: Tezos RPC - API interface to Tezos Blockchain. Tezos Blockchain is the system of record for blockchain data. See documentation for the RPC.
  • Context: Tezos Indexer - stores the full history of Tezos blockchain data and optimizes the storage of it for fast data retrieval by applications that leverage Tezos blockchain data. See Tezos Indexer repository.
  • Context: TezGraph - Provides public API for a Client to:
    • retrieve in near real-time, new operations that are inserted into Tezos Blockchain
    • queries for historical blockchain data are optimized for fast data retrieval

Components

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The TezGraph Context is made up of two components.

  • Subscribe API - A public interface used by a Client to subscribe to new operations.
  • Query API - A public interface used by a Client to query the Index Store for blockchain data.

Responsibilities​

Component: Subscribe API​

  • Accepts a request from a Client for near real-time subscription to
    • new operations of a given kind on a particular account
    • new operations of a given kind on a particular set of accounts
    • life-cycle progress a particular operation (operation position in mempool, on the blockchain, its status, etc.)
  • Opens a connection with Tezos RPC to discover
    • new head blocks
    • new mempool operations
  • Receives from Tezos RPC
    • new head block header
    • new mempool operation
  • Immediately fetches block from Tezos RPC when new head block header is received
  • Parses a new head block for
    • operations on a particular account
    • operations for a particular set of accounts
    • a particular operation
  • Determines when a new mempool operation is a particular operation
  • Transforms new operation from Tezos RPC schema to TezGraph schema
  • Immediately provides a subscribed Client a new operation
  • Cancels a particular subscription from a Client when requested

Context: Tezos RPC​

  • Immediately returns new head block header via a connection established by Subscribe API
  • Immediately returns new mempool operation via a connection established by Subscribe API
  • Gives a particular block to Subscribe API when requested

Component: Query API​

  • Accepts request to execute query from a Client
  • Executes query for blockchain data against the Tezos Indexer
  • Transforms query results from Tezos Indexer from Tezos RPC schema to TezGraph schema
  • Returns query results to a Client

Context: Tezos Indexer​

  • Executes query for blockchain data when requested by Query API