client-rust/examples/transaction.rs

112 lines
3.2 KiB
Rust

// Copyright 2018 The TiKV Project Authors
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
mod common;
use crate::common::parse_args;
use futures::{future, Future, Stream};
use std::ops::RangeBounds;
use tikv_client::{
transaction::{Client, IsolationLevel},
Config, Key, KvPair, Value,
};
fn puts(client: &Client, pairs: impl IntoIterator<Item = impl Into<KvPair>>) {
let mut txn = client.begin();
let _: Vec<()> = future::join_all(
pairs
.into_iter()
.map(Into::into)
.map(|p| txn.set(p.key().clone(), p.value().clone())),
)
.wait()
.expect("Could not set key value pairs");
txn.commit().wait().expect("Could not commit transaction");
}
fn get(client: &Client, key: Key) -> Value {
let txn = client.begin();
txn.get(key).wait().expect("Could not get value")
}
fn scan(client: &Client, range: impl RangeBounds<Key>, mut limit: usize) {
client
.begin()
.scan(range)
.take_while(move |_| {
Ok(if limit == 0 {
false
} else {
limit -= 1;
true
})
})
.for_each(|pair| {
println!("{:?}", pair);
Ok(())
})
.wait()
.expect("Could not scan keys");
}
fn dels(client: &Client, keys: impl IntoIterator<Item = Key>) {
let mut txn = client.begin();
txn.set_isolation_level(IsolationLevel::ReadCommitted);
let _: Vec<()> = keys
.into_iter()
.map(|p| {
txn.delete(p).wait().expect("Could not delete key");
})
.collect();
txn.commit().wait().expect("Could not commit transaction");
}
fn main() {
// You can try running this example by passing your pd endpoints
// (and SSL options if necessary) through command line arguments.
let args = parse_args("txn");
// Create a configuration to use for the example.
// Optionally encrypt the traffic.
let config = if let (Some(ca), Some(cert), Some(key)) = (args.ca, args.cert, args.key) {
Config::new(args.pd).with_security(ca, cert, key)
} else {
Config::new(args.pd)
};
let txn = Client::new(config)
.wait()
.expect("Could not connect to tikv");
// set
let key1: Key = b"key1".to_vec().into();
let value1: Value = b"value1".to_vec().into();
let key2: Key = b"key2".to_vec().into();
let value2: Value = b"value2".to_vec().into();
puts(&txn, vec![(key1, value1), (key2, value2)]);
// get
let key1: Key = b"key1".to_vec().into();
let value1 = get(&txn, key1.clone());
println!("{:?}", (key1, value1));
// scan
let key1: Key = b"key1".to_vec().into();
scan(&txn, key1.., 10);
// delete
let key1: Key = b"key1".to_vec().into();
let key2: Key = b"key2".to_vec().into();
dels(&txn, vec![key1, key2]);
}