phoenix-common 0.4.0

On-chain order book that atomically settles trades
Documentation 
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use crate::program::error::assert_with_msg;
use solana_program::{
    account_info::AccountInfo, program_error::ProgramError, pubkey::Pubkey, system_program,
};
use std::ops::Deref;

pub mod phoenix_checkers;
pub mod token_checkers;

pub use token_checkers::*;

#[derive(Clone)]
pub struct PDA<'a, 'info> {
    info: &'a AccountInfo<'info>,
}

impl<'a, 'info> PDA<'a, 'info> {
    pub fn new(
        info: &'a AccountInfo<'info>,
        known_address: &Pubkey,
    ) -> Result<PDA<'a, 'info>, ProgramError> {
        assert_with_msg(
            info.key == known_address,
            ProgramError::InvalidInstructionData,
            "Incorrect account key",
        )?;
        Ok(Self { info })
    }
}

impl<'a, 'info> AsRef<AccountInfo<'info>> for PDA<'a, 'info> {
    fn as_ref(&self) -> &AccountInfo<'info> {
        self.info
    }
}

impl<'a, 'info> Deref for PDA<'a, 'info> {
    type Target = AccountInfo<'info>;

    fn deref(&self) -> &Self::Target {
        self.info
    }
}

#[derive(Clone)]
pub struct Program<'a, 'info> {
    info: &'a AccountInfo<'info>,
}

impl<'a, 'info> Program<'a, 'info> {
    pub fn new(
        info: &'a AccountInfo<'info>,
        expected_program_id: &Pubkey,
    ) -> Result<Program<'a, 'info>, ProgramError> {
        assert_with_msg(
            info.key == expected_program_id,
            ProgramError::IncorrectProgramId,
            "Incorrect program id",
        )?;
        Ok(Self { info })
    }
}

impl<'a, 'info> AsRef<AccountInfo<'info>> for Program<'a, 'info> {
    fn as_ref(&self) -> &AccountInfo<'info> {
        self.info
    }
}

impl<'a, 'info> Deref for Program<'a, 'info> {
    type Target = AccountInfo<'info>;

    fn deref(&self) -> &Self::Target {
        self.info
    }
}

#[derive(Clone)]
pub struct Signer<'a, 'info> {
    info: &'a AccountInfo<'info>,
}

impl<'a, 'info> Signer<'a, 'info> {
    pub fn new(info: &'a AccountInfo<'info>) -> Result<Signer<'a, 'info>, ProgramError> {
        assert_with_msg(
            info.is_signer,
            ProgramError::MissingRequiredSignature,
            "Missing required signature",
        )?;
        Ok(Self { info })
    }

    pub fn new_with_key(
        info: &'a AccountInfo<'info>,
        key: &Pubkey,
    ) -> Result<Signer<'a, 'info>, ProgramError> {
        let signer = Self::new(info)?;
        assert_with_msg(
            signer.key == key,
            ProgramError::MissingRequiredSignature,
            "Incorrect key for signer",
        )?;
        Ok(signer)
    }

    pub fn new_payer(info: &'a AccountInfo<'info>) -> Result<Signer<'a, 'info>, ProgramError> {
        assert_with_msg(
            info.is_writable,
            ProgramError::InvalidInstructionData,
            "Payer is not writable",
        )?;
        assert_with_msg(
            info.is_signer,
            ProgramError::MissingRequiredSignature,
            "Missing required signature for payer",
        )?;
        Ok(Self { info })
    }
}

impl<'a, 'info> AsRef<AccountInfo<'info>> for Signer<'a, 'info> {
    fn as_ref(&self) -> &AccountInfo<'info> {
        self.info
    }
}

impl<'a, 'info> Deref for Signer<'a, 'info> {
    type Target = AccountInfo<'info>;

    fn deref(&self) -> &Self::Target {
        self.info
    }
}

#[derive(Clone)]
pub struct EmptyAccount<'a, 'info> {
    info: &'a AccountInfo<'info>,
}

impl<'a, 'info> EmptyAccount<'a, 'info> {
    pub fn new(info: &'a AccountInfo<'info>) -> Result<EmptyAccount<'a, 'info>, ProgramError> {
        assert_with_msg(
            info.data_is_empty(),
            ProgramError::InvalidAccountData,
            "Account must be uninitialized",
        )?;
        assert_with_msg(
            info.owner == &system_program::id(),
            ProgramError::IllegalOwner,
            "Empty accounts must be owned by the system program",
        )?;
        Ok(Self { info })
    }
}

impl<'a, 'info> AsRef<AccountInfo<'info>> for EmptyAccount<'a, 'info> {
    fn as_ref(&self) -> &AccountInfo<'info> {
        self.info
    }
}

impl<'a, 'info> Deref for EmptyAccount<'a, 'info> {
    type Target = AccountInfo<'info>;

    fn deref(&self) -> &Self::Target {
        self.info
    }
}