> For the complete documentation index, see [llms.txt](https://haiko-docs.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://haiko-docs.gitbook.io/docs/developers/events/solvercomponent.md).

# SolverComponent

The following events are shared across all Solver implementations, which inherit from `SolverComponent`.

## `CreateMarket`

This event is emitted when a new pool / market is created. Markets are identified by `market_id`.`CreateMarket` events should be indexed to track the active markets in a solver.

```rust
pub struct CreateMarket {
    #[key]
    pub market_id: felt252,
    pub base_token: ContractAddress,
    pub quote_token: ContractAddress,
    pub owner: ContractAddress,
    pub is_public: bool,
    pub vault_token: ContractAddress,
}
```

* `market_id` is the Poseidon chain hash of the market parameters below (`base_token`, `quote_token`, `owner`, `is_public`, `vault_token`)
* `base_token` is the address of the base token for the market
* `quote_token` is the address of the quote token for the market
* `owner` is the address of the market owner
* `is_public` is a boolean indicating if the market is open to third party LPs / depositors
* `vault_token` is the address of the token used to track LP shares in the market

## `Swap`

This event is emitted when a swap is executed through a solver market. These events can be indexed along with `Deposit` and `Withdraw` events to track the total liquidity in a solver market.

```rust
pub struct Swap {
  #[key]
  pub market_id: felt252,
  #[key]
  pub caller: ContractAddress,
  pub is_buy: bool,
  pub exact_input: bool,
  pub amount_in: u256,
  pub amount_out: u256,
}
```

* `market_id` is the unique id of the market (see `CreateMarket` above)
* `caller` is the address of the user executing the swap
* `is_buy` is a boolean indicating if the swap is a buy or sell
* `exact_input` is a boolean indicating if the swap amount was specified as input or output
* `amount_in` is the amount of the input token swapped in
* `amount_out` is the amount of the output token swapped out

## `Deposit` / `Withdraw`

These events are emitted whenever a user / LP deposits or withdraws liquidity from a solver market. These events can be indexed along with `Swap` events to track the total liquidity in a solver market.

```rust
pub struct Deposit {
    #[key]
    pub caller: ContractAddress,
    #[key]
    pub market_id: felt252,
    pub base_amount: u256,
    pub quote_amount: u256,
    pub shares: u256,
}

pub struct Withdraw {
    #[key]
    pub caller: ContractAddress,
    #[key]
    pub market_id: felt252,
    pub base_amount: u256,
    pub quote_amount: u256,
    pub shares: u256,
}
```

* `caller` is the address of the user / LP depositing liquidity
* `market_id` is the unique id of the market (see `CreateMarket` above)
* `base_amount` is the amount of base tokens deposited
* `quote_amount` is the amount of quote tokens deposited
* `shares` is the amount of LP shares minted or burned

## `Pause` / `Unpause`

These events are emitted when a market is paused and unpaused. Paused markets should not accrue rewards as they will reject incoming swaps. These events can be indexed to track the paused state of solver markets.

```rust
pub struct Pause {
    #[key]
    pub market_id: felt252,
}

pub struct Unpause {
    #[key]
    pub market_id: felt252,
}
```