| Report Date | 2025-04-16 |
| Submitted by | Timothy Wu |
As technical lead of the Gossamer project I am comitted to delivering an alternative validator node written in Go for the Polkadot ecosystem. I have continued working on the integration of our version of TrieDB into the Gossamer codebase, which has resulted in us trying to create a Substrate like Client type that incorporates TrieDB through it's own dependencies.
I started worked on recreating the StateDb type first found in sc_state_db by first implementing the pruning maintenance in PR #3956, and implementing the non-canonical overlays in PR #3951. The work in these two PRs were used to create our own StateDB componenent in PR #3967.
After that I moved onto another dependency of the Client which is the BlockchainDb type found in the sc_client_db crate. This type is the persisted database for block headers and the PR #4015 also introduces a number of primitives that are Substrate compatible.
Further work was required to our TrieDB component to support the iteration use cases that would be needed by the future work related to the Client, as well as introducing a memory backed version of HashDB. This work can be found in PR #4315.
We ended up creating our own version of TrieBackend from sp_state_machine in PR #4318 which utilizes TrieDB now backed by HashDB. In substrate the TrieBackend is utlized by sc_client_db::Backend which is the chief dependency of the Substrate Client.
The work to incorporate TrieBackend and BlockchainDB into our version of sc_client_db::Backend can be found in PR #4405. We also introduced a public api.Backend interface which is analagous to sc_client_api::Backend.
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