mirror of
https://github.com/GothenburgBitFactory/taskwarrior.git
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add taskdb
This commit is contained in:
Dustin J. Mitchell
parent
10c7dd28b9
commit
e5a92826f6
7 changed files with 481 additions and 7 deletions
323
Cargo.lock
generated
323
Cargo.lock
generated
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@ -1,6 +1,329 @@
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|
||||
"checksum serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)" = "48c575e0cc52bdd09b47f330f646cf59afc586e9c4e3ccd6fc1f625b8ea1dad7"
|
||||
"checksum syn 1.0.11 (registry+https://github.com/rust-lang/crates.io-index)" = "dff0acdb207ae2fe6d5976617f887eb1e35a2ba52c13c7234c790960cdad9238"
|
||||
"checksum synstructure 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "67656ea1dc1b41b1451851562ea232ec2e5a80242139f7e679ceccfb5d61f545"
|
||||
"checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
|
||||
"checksum unicode-xid 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
|
||||
"checksum uuid 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9fde2f6a4bea1d6e007c4ad38c6839fa71cbb63b6dbf5b595aa38dc9b1093c11"
|
||||
"checksum wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b89c3ce4ce14bdc6fb6beaf9ec7928ca331de5df7e5ea278375642a2f478570d"
|
||||
"checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
|
||||
"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
|
|
|||
|
|
@ -7,3 +7,7 @@ edition = "2018"
|
|||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
uuid = { version = "0.8.1", features = ["serde", "v4"] }
|
||||
serde_json = "1.0"
|
||||
chrono = "0.4.10"
|
||||
failure = {version = "0.1.5", features = ["derive"] }
|
||||
|
|
|
|||
|
|
@ -29,6 +29,8 @@ Each operation has one of the forms
|
|||
* `Update(uuid, property, value, timestamp)`
|
||||
|
||||
The former form creates a new task.
|
||||
It is invalid to create a task that already exists.
|
||||
|
||||
The latter form updates the given property of the given task.
|
||||
It is invalid to update a task that does not exist.
|
||||
The timestamp on updates serves as additional metadata and is used to resolve conflicts.
|
||||
|
|
|
|||
7
src/errors.rs
Normal file
7
src/errors.rs
Normal file
|
|
@ -0,0 +1,7 @@
|
|||
use failure::Fail;
|
||||
|
||||
#[derive(Debug, Fail, Eq, PartialEq, Clone)]
|
||||
pub enum Error {
|
||||
#[fail(display = "Task Database Error: {}", _0)]
|
||||
DBError(String),
|
||||
}
|
||||
3
src/lib.rs
Normal file
3
src/lib.rs
Normal file
|
|
@ -0,0 +1,3 @@
|
|||
mod errors;
|
||||
mod operation;
|
||||
mod taskdb;
|
||||
|
|
@ -1,7 +0,0 @@
|
|||
mod operation;
|
||||
|
||||
// see https://raw.githubusercontent.com/Operational-Transformation/ot.js/master/dist/ot.js
|
||||
|
||||
fn main() {
|
||||
println!("Hello, world!");
|
||||
}
|
||||
142
src/taskdb.rs
Normal file
142
src/taskdb.rs
Normal file
|
|
@ -0,0 +1,142 @@
|
|||
use crate::errors::Error;
|
||||
use chrono::{DateTime, Utc};
|
||||
use serde_json::Value;
|
||||
use std::collections::hash_map::Entry;
|
||||
use std::collections::HashMap;
|
||||
use uuid::Uuid;
|
||||
|
||||
#[derive(PartialEq, Clone, Debug)]
|
||||
enum Operation {
|
||||
Create {
|
||||
uuid: Uuid,
|
||||
},
|
||||
Update {
|
||||
uuid: Uuid,
|
||||
property: String,
|
||||
value: Value,
|
||||
timestamp: DateTime<Utc>,
|
||||
},
|
||||
}
|
||||
|
||||
struct DB {
|
||||
// The current state, with all pending operations applied
|
||||
tasks: HashMap<Uuid, HashMap<String, Value>>,
|
||||
|
||||
// The version at which `operations` begins
|
||||
base_version: u64,
|
||||
|
||||
// Operations applied since `base_version`, in order.
|
||||
//
|
||||
// INVARIANT: Given a snapshot at `base_version`, applying these operations produces `tasks`.
|
||||
operations: Vec<Operation>,
|
||||
}
|
||||
|
||||
impl DB {
|
||||
fn new() -> DB {
|
||||
DB {
|
||||
tasks: HashMap::new(),
|
||||
base_version: 0,
|
||||
operations: vec![],
|
||||
}
|
||||
}
|
||||
|
||||
fn apply(&mut self, op: Operation) -> Result<(), Error> {
|
||||
match op {
|
||||
Operation::Create { uuid } => {
|
||||
match self.tasks.entry(uuid) {
|
||||
Entry::Occupied(_) => {
|
||||
return Err(Error::DBError(format!("Task {} already exists", uuid)));
|
||||
}
|
||||
ent @ Entry::Vacant(_) => {
|
||||
ent.or_insert(HashMap::new());
|
||||
}
|
||||
};
|
||||
}
|
||||
Operation::Update {
|
||||
ref uuid,
|
||||
ref property,
|
||||
ref value,
|
||||
timestamp: _,
|
||||
} => {
|
||||
match self.tasks.get_mut(uuid) {
|
||||
Some(task) => {
|
||||
task.insert(property.clone(), value.clone());
|
||||
}
|
||||
None => {
|
||||
return Err(Error::DBError(format!("Task {} does not exist", uuid)));
|
||||
}
|
||||
};
|
||||
}
|
||||
};
|
||||
self.operations.push(op);
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
use uuid::Uuid;
|
||||
|
||||
#[test]
|
||||
fn test_apply_create() {
|
||||
let mut db = DB::new();
|
||||
let uuid = Uuid::new_v4();
|
||||
let op = Operation::Create { uuid };
|
||||
db.apply(op.clone()).unwrap();
|
||||
|
||||
let mut exp = HashMap::new();
|
||||
exp.insert(uuid, HashMap::new());
|
||||
assert_eq!(db.tasks, exp);
|
||||
assert_eq!(db.operations, vec![op]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_apply_create_exists() {
|
||||
let mut db = DB::new();
|
||||
let uuid = Uuid::new_v4();
|
||||
db.apply(Operation::Create { uuid }).unwrap();
|
||||
assert_eq!(
|
||||
db.apply(Operation::Create { uuid }),
|
||||
Err(Error::DBError(format!("Task {} already exists", uuid)))
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_apply_create_update() {
|
||||
let mut db = DB::new();
|
||||
let uuid = Uuid::new_v4();
|
||||
let op1 = Operation::Create { uuid };
|
||||
db.apply(op1.clone()).unwrap();
|
||||
let op2 = Operation::Update {
|
||||
uuid,
|
||||
property: String::from("title"),
|
||||
value: Value::from("\"my task\""),
|
||||
timestamp: Utc::now(),
|
||||
};
|
||||
db.apply(op2.clone()).unwrap();
|
||||
|
||||
let mut exp = HashMap::new();
|
||||
let mut task = HashMap::new();
|
||||
task.insert(String::from("title"), Value::from("\"my task\""));
|
||||
exp.insert(uuid, task);
|
||||
assert_eq!(db.tasks, exp);
|
||||
assert_eq!(db.operations, vec![op1, op2]);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn test_apply_update_does_not_exist() {
|
||||
let mut db = DB::new();
|
||||
let uuid = Uuid::new_v4();
|
||||
assert_eq!(
|
||||
db.apply(Operation::Update {
|
||||
uuid,
|
||||
property: String::from("title"),
|
||||
value: Value::from("\"my task\""),
|
||||
timestamp: Utc::now(),
|
||||
}),
|
||||
Err(Error::DBError(format!("Task {} does not exist", uuid)))
|
||||
);
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue