penumbra_dex/component/action_handler/position/
open.rs

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use anyhow::{ensure, Result};
use async_trait::async_trait;
use cnidarium::StateWrite;
use cnidarium_component::ActionHandler;

use crate::{
    component::{PositionManager, StateReadExt},
    lp::{action::PositionOpen, position},
};

#[async_trait]
/// Debits the initial reserves and credits an opened position NFT.
impl ActionHandler for PositionOpen {
    type CheckStatelessContext = ();
    async fn check_stateless(&self, _context: ()) -> Result<()> {
        // Check:
        //  + reserves are at most 80 bits wide,
        //  + the trading function coefficients are at most 80 bits wide.
        //  + at least some assets are provisioned.
        //  + the trading function coefficients are non-zero,
        //  + the trading function doesn't specify a cyclic pair,
        //  + the fee is <=50%.
        self.position.check_stateless()?;
        if self.position.state != position::State::Opened {
            anyhow::bail!("attempted to open a position with a state besides `Opened`");
        }
        Ok(())
    }

    async fn check_and_execute<S: StateWrite>(&self, mut state: S) -> Result<()> {
        // Only open the position if the dex is enabled in the dex params.
        let dex_params = state.get_dex_params().await?;

        ensure!(
            dex_params.is_enabled,
            "Dex MUST be enabled to open positions."
        );

        state.open_position(self.position.clone()).await?;
        Ok(())
    }
}