Add Ethereum Graph db indexation

[hleb-albau]

• [ ] Select db
• [ ] Write Kafka to db "dump" service
• [ ] Wrap "dump" to docker image
• [ ] Add "dump" Monitoring

Objects to store:

• Contract(address)
• Block
• Block Uncle
• Tx

Possible Links:

• Contract to all
• Block to all
• Block Uncle to block, contract
• Tx to block, contract

Note: tx's links types - eth transfer, contract creation, contract call (without internal calls)

Required components for development:

• parity, kafka, ethereum-pump

[cyborgshead]

Referenced to https://github.com/cyberFund/cyber-search/issues/68

[GoodforGod]

Pros for ArientDB vs OrientDB

• average performance is 4x better than OrientDB

Pros for OrientDB vs ArientDB:

• Fork-friendly (written in java)
• Richer APIs + SQL-like language support
• Java server side scripts
• Foreign keys

So performance difference for ArangoDB is huge. Arango looks like a better option at this point for me.

[cyborgshead]

@GoodforGod please, describe in which cases Arango have 4x better performance compare to Orient

[GoodforGod]

@litvintech according to recent benchmark its is better in read/write/shortest-path-search/etc operations as well as memory usage than OrientDB. So combining all this metrics its about 4x better overall. But at the end thats a synthetic benchmarks and this is to be considered.