openpit 0.4.0

Embeddable pre-trade risk SDK
Documentation 
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// Copyright The Pit Project Owners. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Please see https://github.com/openpitkit and the OWNERS file for details.

use crate::core::{AccountGroups, AccountGroupsHandle, GroupLookup};
use crate::param::{AccountGroupId, AccountId};
use crate::storage::{self, StorageBuilder};

/// Context of the current post-trade (execution-report) operation.
///
/// Exposes lazy account-group accessors for the report's account. Unlike
/// [`PreTradeContext`](crate::pretrade::PreTradeContext) and
/// [`AccountAdjustmentContext`](crate::AccountAdjustmentContext) it carries no
/// `account_control`: post-trade processing reports account blocks through the
/// [`PostTradeResult`](crate::pretrade::PostTradeResult) return value instead.
///
/// The bound account is the report's account; it is `None` when the report
/// carries no recognizable account identifier, in which case
/// [`account_group`](Self::account_group) returns `None`.
pub struct PostTradeContext<StorageFactory>
where
    StorageFactory: storage::LockingPolicyFactory + storage::CreateStorageFor<AccountId> + 'static,
{
    group_lookup: GroupLookup<StorageFactory>,
}

impl<StorageFactory> PostTradeContext<StorageFactory>
where
    StorageFactory: storage::LockingPolicyFactory + storage::CreateStorageFor<AccountId> + 'static,
{
    pub(crate) fn with_groups(
        account_groups: AccountGroupsHandle<StorageFactory>,
        account: Option<AccountId>,
    ) -> Self {
        Self {
            group_lookup: GroupLookup::new(account_groups, account),
        }
    }

    /// Creates a standalone context for testing a [`PreTradePolicy`]'s
    /// post-trade hook outside an engine.
    ///
    /// The context is backed by an empty, private account-group registry and no
    /// bound account, so [`account_group`](Self::account_group) returns `None`.
    /// Inside the engine the registry is the engine's shared one; this
    /// constructor exists so policy authors can drive a policy's hook directly
    /// in unit tests.
    ///
    /// [`PreTradePolicy`]: crate::pretrade::PreTradePolicy
    pub fn new() -> Self
    where
        StorageFactory: Default,
    {
        let builder = StorageBuilder::new(StorageFactory::default());
        let handle = AccountGroupsHandle::from_inner(StorageFactory::new_shared(
            AccountGroups::new(&builder),
        ));
        Self::with_groups(handle, None)
    }

    /// Returns the group of the report's account, or `None` when the account is
    /// absent or unregistered.
    ///
    /// The lookup is performed once and cached for the lifetime of this context.
    pub fn account_group(&self) -> Option<AccountGroupId> {
        self.group_lookup.group()
    }
}

impl<StorageFactory> Default for PostTradeContext<StorageFactory>
where
    StorageFactory:
        storage::LockingPolicyFactory + storage::CreateStorageFor<AccountId> + Default + 'static,
{
    fn default() -> Self {
        Self::new()
    }
}