2018-01-20 20:58:34 -08:00
|
|
|
## Design philosphy
|
|
|
|
|
|
|
|
|
|
The design of the Cosmos SDK is based on the principles of "cababilities systems".
|
|
|
|
|
|
|
|
|
|
TODO If you see this on the sdk2 branch, it's because I'm still expanding this high-level section.
|
|
|
|
|
|
|
|
|
|
Sections:
|
|
|
|
|
|
|
|
|
|
* Introduction
|
|
|
|
|
- Note to skip to Basecoin example to dive into code.
|
|
|
|
|
* Capabilities systems
|
|
|
|
|
- http://www.erights.org/elib/capability/ode/ode.pdf
|
|
|
|
|
* Tx & Msg
|
|
|
|
|
* MultiStore
|
|
|
|
|
* Context & Handler
|
|
|
|
|
* AnteHandler
|
|
|
|
|
- Fees
|
|
|
|
|
- Authentication
|
|
|
|
|
* Accounts and x/auth
|
|
|
|
|
* AccountStore
|
|
|
|
|
* Wire codec
|
|
|
|
|
- vs encoding/json
|
|
|
|
|
- vs protobuf
|
|
|
|
|
* Dummy example
|
|
|
|
|
* Basecoin example
|
|
|
|
|
* Conclusion
|
|
|
|
|
|
|
|
|
|
## ######################################
|
|
|
|
|
## TODO bring the below up.
|
2018-01-14 14:20:13 -08:00
|
|
|
|
|
|
|
|
### Store
|
|
|
|
|
|
|
|
|
|
- Fast balanced dynamic Merkle tree for storing application state
|
|
|
|
|
- Support multiple Merkle tree backends in a single store
|
|
|
|
|
- allows using Ethereum Patricia Trie and Tendermint IAVL in same app
|
|
|
|
|
- Support iteration
|
|
|
|
|
- Provide caching for intermediate state during execution of blocks and transactions (including for iteration)
|
|
|
|
|
- Retain some amount of recent historical state
|
|
|
|
|
- Allow many kinds of proofs (exists, absent, range, etc.) on current and retained historical state
|
|
|
|
|
|
|
|
|
|
### ABCI Application
|
|
|
|
|
|
|
|
|
|
- Simple connector between developer's application logic and the ABCI protocol
|
|
|
|
|
- Simplify discrepancy between DeliverTx and CheckTx
|
|
|
|
|
- Handles ABCI handshake logic and historical state
|
|
|
|
|
- Provide simple hooks to BeginBlock and EndBlock
|
|
|
|
|
|
|
|
|
|
### Transaction Processing
|
|
|
|
|
|
|
|
|
|
- Transactions consist of composeable messages
|
|
|
|
|
- Processing via series of handlers that handle authenticate, deduct fees, transfer coins, etc.
|
|
|
|
|
- Developers control tx encoding
|
|
|
|
|
- Default go-wire
|
|
|
|
|
- Must be able to write eg. Ethermint using the SDK with Ethereum-native transaction encoding
|
|
|
|
|
- Handler access to the store is restricted via capabilities and interfaces
|
|
|
|
|
- Context object holds
|
|
|
|
|
|
|
|
|
|
### Data Types
|
|
|
|
|
|
|
|
|
|
- Default Ethereum-style Account
|
|
|
|
|
- Default multi-asset Coins
|
|
|
|
|
|
