Event Sourcing Schema Definition Language
Schema definition language for defining aggregates, commands, events & custom types.
Heavily inspired by GraphQL syntax, you can describe aggregates which can be used for codegen in different languages.
``` aggregate BankAccount { openaccount(initialbalance: Float!) OpenedAccount! depositfunds(amount: Float!): ReceivedFunds! withdrawfunds(amount: Float!): SentFunds! transact(amount: Float!, user: User!) (SentFunds | ReceivedFunds) }
event OpenedAccount { initial_balance: Float! }
event SentFunds { amount: Float! user: User }
event ReceivedFunds { amount: Float! user: User }
type User { id: String! name: String } ```
| Scalar | Rust Type |
| ----------- | ---------------------------------------------------------------------------------------------------- |
| String | String |
| Int | i64 |
| Float | f64 |
| Bool | bool |
| Timestamp | chrono::DateTime<chrono::FixedOffset> |
Types can be marked as required by adding the ! suffix.
| Type | Syntax | Example |
| -------- | -------- | --------- |
| Optional | (none) | String |
| Required | ! | String! |
Types can be repeated by wrapping them in [].
| Type | Syntax | Example |
| ------ | --------- | ---------- |
| Single | (none) | String |
| Array | [...] | [String] |
Remember, we can mark types as required, even in arrays.
| Type | Syntax | Example |
| -------------------- | ---------- | ----------- |
| Optional Array | [...] | [String] |
| Required Array | [...]! | [String]! |
| Required Array Items | [...!] | [String!] |
Integrates with Thalo to generate Rust code.