Definition and usage
As a part of the Relation Protocol, the main function of the Graph Indexer is to construct a social graph:
Events are the atomic units in the Relation social graph. The general technical specification of the Relation Protocol defines three events:
CreateRDF: Triggered when a SBT containing RDF semantics is created.
UpdateRDF: Triggered when a SBT containing RDF semantics is updated.
RemoveRDF: Triggered when a SBT containing RDF semantics is removed.
The Graph Indexer parses these three events by listening to transactions on the blockchain. Users' social interactions are then stored in a graph database, thus constructing a social graph(see Figure: 7-1). This helps individual developers and companies to build a more meaningful user relationship in Dapps and other decentralized projects. It can foster a more user-friendly social network experience.
This chapter will show you how to construct a Graph Indexer:
Listen to events on the blockchain.: Listens to all events conforming to the EIP6239 specification on the blockchain.
Parse RDF data: Parse the RDF from the event conforming to the Schema specification and construct it into data structure in a graph.
Build the social graph: Store the data into the graph database.
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