First steps of tutorial

This commit is contained in:
Timothy Warren 2019-08-07 14:02:31 -04:00
commit edbb0dcf38
13 changed files with 1146 additions and 0 deletions

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26
Cargo.toml Normal file
View File

@ -0,0 +1,26 @@
[package]
name = "kvs"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
description = "A key-value store"
edition = "2018"
[dependencies]
[dependencies.clap]
version = "2.33.0"
default-features = false
features = ["color"]
[dev-dependencies]
assert_cmd = "0.11.0"
predicates = "1.0.0"
[lib]
test = false
doctest = false
[[bin]]
name = "kvs"
test = false
doctest = false

56
src/bin/kvs.rs Normal file
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@ -0,0 +1,56 @@
#[macro_use]
extern crate clap;
use std::process::{abort, exit};
fn parse_args() -> Result<(), &'static str> {
let matches = clap_app!(myapp =>
(version: env!("CARGO_PKG_VERSION"))
(author: env!("CARGO_PKG_AUTHORS"))
(about: env!("CARGO_PKG_DESCRIPTION"))
(@arg version: -V "Print the version")
(@subcommand get =>
(about: "Get the string value of a given string key")
(@arg key: +required "The key to lookup")
)
(@subcommand set =>
(about: "Set the value of a string key to a string")
(@arg key: +required "The key to set")
(@arg value: +required "The value to set")
)
(@subcommand rm =>
(about: "Remove a given key")
(@arg key: +required "The key to remove")
)
).get_matches();
match matches.subcommand_name() {
Some("get") => {
Err("unimplemented")
},
Some("set") => {
Err("unimplemented")
},
Some("rm") => {
Err("unimplemented")
},
_ => {
if matches.is_present("version") {
println!(env!("CARGO_PKG_VERSION"));
return Ok(());
}
Err("")
}
}
}
fn main() {
match parse_args() {
Ok(_) => exit(0),
Err(err) => {
eprintln!("{}", err);
abort()
},
}
}

36
src/lib.rs Normal file
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@ -0,0 +1,36 @@
#![deny(missing_docs)]
//! An implementation of a key/value store
use std::collections::HashMap;
#[derive(Debug, Default)]
/// A key/value store
pub struct KvStore {
store: HashMap<String, String>
}
impl KvStore {
/// Create a new store
pub fn new() -> Self {
KvStore {
store: HashMap::new(),
}
}
/// Set a key/value pair
pub fn set(&mut self, key: String, value: String) {
self.store.insert(key, value);
}
/// Get the value at the specified key
pub fn get(&mut self, key: String) -> Option<String> {
match self.store.get(&key) {
Some(s) => Some(s.to_owned()),
None => None,
}
}
/// Remove the value at the specified key
pub fn remove(&mut self, key: String) {
self.store.remove(&key);
}
}

155
tests/tests.rs Normal file
View File

@ -0,0 +1,155 @@
use assert_cmd::prelude::*;
use kvs::KvStore;
use predicates::str::contains;
use std::process::Command;
// `kvs` with no args should exit with a non-zero code.
#[test]
fn cli_no_args() {
Command::cargo_bin("kvs").unwrap().assert().failure();
}
// `kvs -V` should print the version
#[test]
fn cli_version() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["-V"])
.assert()
.stdout(contains(env!("CARGO_PKG_VERSION")));
}
// `kvs get <KEY>` should print "unimplemented" to stderr and exit with non-zero code
#[test]
fn cli_get() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["get", "key1"])
.assert()
.failure()
.stderr(contains("unimplemented"));
}
// `kvs set <KEY> <VALUE>` should print "unimplemented" to stderr and exit with non-zero code
#[test]
fn cli_set() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["set", "key1", "value1"])
.assert()
.failure()
.stderr(contains("unimplemented"));
}
// `kvs rm <KEY>` should print "unimplemented" to stderr and exit with non-zero code
#[test]
fn cli_rm() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["rm", "key1"])
.assert()
.failure()
.stderr(contains("unimplemented"));
}
#[test]
fn cli_invalid_get() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["get"])
.assert()
.failure();
Command::cargo_bin("kvs")
.unwrap()
.args(&["get", "extra", "field"])
.assert()
.failure();
}
#[test]
fn cli_invalid_set() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["set"])
.assert()
.failure();
Command::cargo_bin("kvs")
.unwrap()
.args(&["set", "missing_field"])
.assert()
.failure();
Command::cargo_bin("kvs")
.unwrap()
.args(&["set", "extra", "extra", "field"])
.assert()
.failure();
}
#[test]
fn cli_invalid_rm() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["rm"])
.assert()
.failure();
Command::cargo_bin("kvs")
.unwrap()
.args(&["rm", "extra", "field"])
.assert()
.failure();
}
#[test]
fn cli_invalid_subcommand() {
Command::cargo_bin("kvs")
.unwrap()
.args(&["unknown", "subcommand"])
.assert()
.failure();
}
// Should get previously stored value
#[test]
fn get_stored_value() {
let mut store = KvStore::new();
store.set("key1".to_owned(), "value1".to_owned());
store.set("key2".to_owned(), "value2".to_owned());
assert_eq!(store.get("key1".to_owned()), Some("value1".to_owned()));
assert_eq!(store.get("key2".to_owned()), Some("value2".to_owned()));
}
// Should overwrite existent value
#[test]
fn overwrite_value() {
let mut store = KvStore::new();
store.set("key1".to_owned(), "value1".to_owned());
assert_eq!(store.get("key1".to_owned()), Some("value1".to_owned()));
store.set("key1".to_owned(), "value2".to_owned());
assert_eq!(store.get("key1".to_owned()), Some("value2".to_owned()));
}
// Should get `None` when getting a non-existent key
#[test]
fn get_non_existent_value() {
let mut store = KvStore::new();
store.set("key1".to_owned(), "value1".to_owned());
assert_eq!(store.get("key2".to_owned()), None);
}
#[test]
fn remove_key() {
let mut store = KvStore::new();
store.set("key1".to_owned(), "value1".to_owned());
store.remove("key1".to_owned());
assert_eq!(store.get("key1".to_owned()), None);
}