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contractor.md

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Introduction

Contractor is the service responsible for downloading SmartWeave contracts from Arweave and saving them to a Postgres database. It constantly monitors the Arweave network for new blocks, downloads transactions, parses contracts and saves them to the database.

Run

# Start from the latest saved block
./syncer contract

# Overwrite contracts within a block range and stop
./syncer contract --start=1237269 --stop=1237269 --DANGEROUS_replace_existing_data

Internals

Here are some details about how the Contractor works internally. Each box in the diagram is a separate Task that may spawn multiple goroutines, everything is set up in src/contract/controller.go.

flowchart TD
    NetworkMonitor --> |L1 block info| BlockDownloader
    BlockDownloader --> |Arweave blocks| TransactionDownloader
    TransactionDownloader --> |L1 transactions| Loader
    Loader -->|Contract| Store
    Arweave <--> |Load contract src, init state| Loader
    Store --> Database
    Store --> |Contract| RedisMapper
    RedisMapper --> |Redis Message| RedisPublishers
    RedisPublishers --> |Redis Message| Redis
    Store --> |Contract| AppSyncMapper
    AppSyncMapper --> |AppSync Message| AppSyncPublisher
    AppSyncPublisher --> |AppSync Message| AppSync