https://github.com/maoueh/substreams-eth-absrel

Showcase how one can solve two series of events, one emitting relative values the other absolute
https://github.com/maoueh/substreams-eth-absrel

Last synced: 2 days ago
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Showcase how one can solve two series of events, one emitting relative values the other absolute

• Host: GitHub
• URL: https://github.com/maoueh/substreams-eth-absrel
• Owner: maoueh
• Created: 2024-05-07T01:04:21.000Z (5 months ago)
• Default Branch: master
• Last Pushed: 2024-05-07T01:08:41.000Z (5 months ago)
• Last Synced: 2024-05-07T02:27:50.552Z (5 months ago)
• Language: Rust
• Size: 19.5 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Substreams Ethereum - Absolute/Relative Problem

It happens that some contracts specifies events to report delta values and on other event using absolute values to represent a single entity.

Uniswap V3 Pool contract is an example of this. The `Mint` and `Burn` events are emitting relative values while `Swap` event emits absolute values for the same entity, one of the pool's token.

### Solution

To achieve that in Substreams, accumulate all the relative values in one store, accumulate all the "latest" value in another store. Then in a mapper/store that depends on those 2 stores, reconcile both values by adding the summed up relative values against the latest value.

- See [store_mint_burn_liquidity](./src/lib.rs#L41-L69) for accumulation of Mint/Burn relative values.

- See [store_swap_liquidity](./src/lib.rs#L72-86) for accumulation of Swap absolute values.

- See [map_output](./src/lib.rs#L89-103) for merging of relative values with absolute values to from a single store value.