Moonstream: Basic functionality about api HOT 8 CLOSED

Launch ready by: August 2, 2021

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Ethereum blockchain crawl can use the rubric set by our ethereum-exploration repo.

Spire API must allow callers to specify created_at when they create an entry.

Spire issue: bugout-dev/spire#6

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When a user creates a subscription for a new contract, the state of the subscription should be "populating". When we crawl all the data for that contract up to the current transaction block, we can set the state of the subscription to "active".

The frontend should distinguish between these states to manage user expectations.

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Something we should think about for post-alpha: How should we handle contracts that are only part of inactive subscriptions?

Should we stop collecting information about them from mined transaction blocks?

Most likely we wouldn't collect information about them from transaction pool.

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When we are crawling blockchain data, we will start at the current transaction block and work our way back to genesis block so that we can show live events to users.

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Riskiest feature is smart contract context. We will need information about the smart contract on which operations are being executed in order to display the context correctly. There are a few different ways we can get the smart contract code:

1. Crawl public smart contracts from GitHub
2. Ask the user to paste the smart contract code in the frontend.

When Moonstream is more mature, we should allow all of these. For now, we will probably set up a crawl or at least crawl Open Zeppelin contracts. The context will have to be generated by the API, and the frontend will only handle display logic (React component).

It may take us some time to decide the right architecture for crawling the data and caching it/storing it. This may not make it into Alpha.

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Crawling blockchain data:

We should probably store all transaction information inside a database so that we don't have to repeat crawls over and over again.

This will require some infrastructure work - we should set up a Postgres instance with a LOT of storage (~10TB?) but with cheap storage class - HDD should be okay.

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Moonstream discord server is up. Invitation link

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