grid-sdk 0.3.5

Hyperledger Grid is a platform for building supply chain solutions that include distributed ledger components. It provides a growing set of tools that accelerate development for supply chain smart contractsand client interfaces.
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// Copyright 2018-2020 Cargill Incorporated
//
// 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.

use super::CommitStoreOperations;
use crate::commits::store::diesel::{models::CommitModel, schema::commits, CommitStoreError};
use crate::error::InternalError;

use diesel::prelude::*;

pub(in crate::commits) trait CommitStoreGetCurrentCommitIdOperation {
    fn get_current_commit_id(&self) -> Result<Option<String>, CommitStoreError>;
}

#[cfg(feature = "postgres")]
impl<'a> CommitStoreGetCurrentCommitIdOperation
    for CommitStoreOperations<'a, diesel::pg::PgConnection>
{
    fn get_current_commit_id(&self) -> Result<Option<String>, CommitStoreError> {
        self.conn.transaction::<_, CommitStoreError, _>(|| {
            commits::table
                .select(commits::all_columns)
                .order_by(commits::commit_num.desc())
                .limit(1)
                .first::<CommitModel>(self.conn)
                .map(|commit| commit.commit_id)
                .optional()
                .map_err(|err| {
                    CommitStoreError::InternalError(InternalError::from_source(Box::new(err)))
                })
        })
    }
}

#[cfg(feature = "sqlite")]
impl<'a> CommitStoreGetCurrentCommitIdOperation
    for CommitStoreOperations<'a, diesel::sqlite::SqliteConnection>
{
    fn get_current_commit_id(&self) -> Result<Option<String>, CommitStoreError> {
        self.conn.transaction::<_, CommitStoreError, _>(|| {
            commits::table
                .select(commits::all_columns)
                .order_by(commits::commit_num.desc())
                .limit(1)
                .first::<CommitModel>(self.conn)
                .map(|commit| commit.commit_id)
                .optional()
                .map_err(|err| {
                    CommitStoreError::InternalError(InternalError::from_source(Box::new(err)))
                })
        })
    }
}