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MightyPork
2021-02-02 22:48:36 +01:00
commit b4dbb94e27
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.gitignore
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/target
.idea/
Cargo.lock
Generated
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Cargo.toml
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[package]
name = "yopa"
version = "0.1.0"
authors = ["Ondřej Hruška <ondra@ondrovo.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
log = "0.4.13"
simple-logging = "2.0.2"
uuid = { version = "0.8", features = ["serde", "v4"] }
serde_json = "1.0.61"
serde = { version = "1.0.120", features = ["derive"] }
#parking_lot = "0.11.1"
anyhow = "1.0.38"
thiserror = "1.0.23"
src/main.rs
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#[macro_use] extern crate log;
use log::LevelFilter;
mod yopa;
use yopa::model;
use yopa::model::DataType;
use crate::yopa::model::TypedValue;
use anyhow::Error;
fn main() {
simple_logging::log_to_stderr(LevelFilter::Debug);
if let Err(e) = _main() {
error!("{:?}", e);
}
}
fn _main() -> anyhow::Result<()> {
simple_logging::log_to_stderr(LevelFilter::Debug);
let mut store = yopa::InMemoryStorage::new();
let recipe_tid = store.insert_object_template(model::ObjectTemplate {
id: Default::default(),
name: "recipe".to_string(),
parent_tpl_id: None
})?;
store.insert_property_template(model::PropertyTemplate {
id: Default::default(),
parent_tpl_id: recipe_tid,
name: "title".to_string(),
optional: false,
multiple: false,
data_type: DataType::String,
default: None
})?;
store.insert_property_template(model::PropertyTemplate {
id: Default::default(),
parent_tpl_id: recipe_tid,
name: "prep_hours".to_string(),
optional: true,
multiple: false,
data_type: DataType::Decimal,
default: None
})?;
let book_tid = store.insert_object_template(model::ObjectTemplate {
id: Default::default(),
name: "book".to_string(),
parent_tpl_id: None
})?;
let br_rid = store.insert_relation_template(model::RelationTemplate {
id: Default::default(),
object_tpl_id: recipe_tid,
name: "book reference".to_string(),
optional: false,
multiple: false,
related_tpl_id: book_tid
})?;
store.insert_property_template(model::PropertyTemplate {
id: Default::default(),
parent_tpl_id: br_rid,
name: "page".to_string(),
optional: true,
multiple: false,
data_type: DataType::Integer,
default: None
})?;
debug!("{:#?}", store);
Ok(())
}
src/yopa.rs
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use std::collections::{HashMap};
use std::iter::Extend;
use crate::yopa::model::{ObjectTemplate, ID};
use thiserror::Error;
use std::hash::Hash;
/// Data model structs and enums
pub mod model {
use serde::{Serialize, Deserialize};
use std::borrow::Cow;
/// Common identifier type
#[allow(non_camel_case_types)]
pub type ID = uuid::Uuid;
/// Object template
#[derive(Debug,Clone,Serialize,Deserialize)]
pub struct ObjectTemplate {
/// PK
pub id : ID,
/// Template name, unique within the database
pub name: String,
/// Parent object template ID
pub parent_tpl_id: Option<ID>,
}
/// Relation between templates
#[derive(Debug,Clone,Serialize,Deserialize)]
pub struct RelationTemplate {
/// PK
pub id: ID,
/// Object template ID
pub object_tpl_id: ID,
/// Relation name, unique within the parent object
pub name: String,
/// Relation is optional
pub optional: bool,
/// Relation can be multiple
pub multiple: bool,
/// Related object template ID
pub related_tpl_id: ID,
}
/// Property definition
#[derive(Debug,Clone,Serialize,Deserialize)]
pub struct PropertyTemplate {
/// PK
pub id: ID,
/// Object or Reference template ID
pub parent_tpl_id: ID,
/// Property name, unique within the parent object or reference
pub name: String,
/// Property is optional
pub optional: bool,
/// Property can be multiple
pub multiple: bool,
/// Property data type
pub data_type: DataType,
/// Default value, used for newly created objects
pub default: Option<TypedValue>,
}
/// Value data type
#[derive(Debug,Clone,Serialize,Deserialize)]
pub enum DataType {
/// Text
String,
/// Integer
Integer,
/// Floating point number
Decimal,
/// Boolean yes/no
Boolean,
}
/// Value of a particular type
#[derive(Debug,Clone,Serialize,Deserialize)]
pub enum TypedValue {
/// Text
String(Cow<'static, str>),
/// Integer
Integer(i64),
/// Floating point number
Decimal(f64),
/// Boolean yes/no
Boolean(bool),
}
}
/// Data value structs
pub mod data {
use serde::{Serialize, Deserialize};
use crate::yopa::model::{ID, TypedValue};
/// Instance of an object
#[derive(Debug,Clone,Serialize,Deserialize)]
pub struct Object {
/// PK
pub id : ID,
/// Object template ID
pub object_tpl_id: ID,
}
/// Relation between two objects
#[derive(Debug,Clone,Serialize,Deserialize)]
pub struct Relation {
/// PK
pub id : ID,
/// Source object ID
pub object_id : ID,
/// Relation template ID
pub rel_tpl_id: ID,
/// Related object ID
pub related_id : ID,
}
/// Value attached to an object
#[derive(Debug,Clone,Serialize,Deserialize)]
pub struct Value {
/// PK
pub id : ID,
/// Owning object ID
pub object_id : ID,
/// Property template ID
pub prop_tpl_id: ID,
/// Property value
pub value : TypedValue,
}
}
#[derive(Debug, Default)]
pub struct InMemoryStorage {
tpl_objects: HashMap<ID, model::ObjectTemplate>,
tpl_relations: HashMap<ID, model::RelationTemplate>,
tpl_properties: HashMap<ID, model::PropertyTemplate>,
data_objects: HashMap<ID, data::Object>,
data_relations: HashMap<ID, data::Relation>,
data_properties: HashMap<ID, data::Value>,
}
fn next_id() -> ID {
uuid::Uuid::new_v4()
}
pub fn zero_id() -> ID {
uuid::Uuid::nil()
}
#[derive(Debug,Error)]
pub enum StorageError {
#[error("Referenced {0} does not exist")]
NotExist(&'static str),
#[error("Schema constraint violation: {0}")]
ConstraintViolation(&'static str),
}
impl InMemoryStorage {
pub fn new() -> Self {
Self::default()
}
pub fn insert_object_template(&mut self, mut tpl : model::ObjectTemplate) -> Result<ID, StorageError> {
if let Some(pid) = tpl.parent_tpl_id {
if !self.tpl_objects.contains_key(&pid) {
return Err(StorageError::NotExist("parent object template"));
}
}
if self.tpl_objects.iter().find(|(_, t)| t.name == tpl.name).is_some() {
return Err(StorageError::ConstraintViolation("object template with this name already exists"));
}
let id = next_id();
tpl.id = id;
self.tpl_objects.insert(id, tpl);
Ok(id)
}
pub fn insert_relation_template(&mut self, mut rel: model::RelationTemplate) -> Result<ID, StorageError> {
if !self.tpl_objects.contains_key(&rel.object_tpl_id) {
return Err(StorageError::NotExist("origin object template"));
}
if !self.tpl_objects.contains_key(&rel.related_tpl_id) {
return Err(StorageError::NotExist("related object template"));
}
if self.tpl_relations.iter().find(|(_, t)| t.name == rel.name && t.object_tpl_id == rel.object_tpl_id).is_some() {
return Err(StorageError::ConstraintViolation("relation with this name and parent already exists"));
}
let id = next_id();
rel.id = id;
self.tpl_relations.insert(id, rel);
Ok(id)
}
pub fn insert_property_template(&mut self, mut prop: model::PropertyTemplate) -> Result<ID, StorageError> {
if !self.tpl_objects.contains_key(&prop.parent_tpl_id) {
// Maybe it's attached to a relation?
if !self.tpl_relations.contains_key(&prop.parent_tpl_id) {
return Err(StorageError::NotExist("object or reference template"));
}
}
if self.tpl_properties.iter().find(|(_, t)| t.parent_tpl_id == prop.parent_tpl_id && t.name == prop.name).is_some() {
return Err(StorageError::ConstraintViolation("property with this name and parent already exists"));
}
let id = next_id();
prop.id = id;
self.tpl_properties.insert(id, prop);
Ok(id)
}
pub fn delete_object_template(&mut self, id : ID) -> Result<ObjectTemplate, StorageError> {
return if let Some(t) = self.tpl_objects.remove(&id) {
// Remove relation templates
let removed_relation_ids = map_drain_filter(&mut self.tpl_relations, |_k, v| v.object_tpl_id == id || v.related_tpl_id == id)
.keys();
// Remove related property templates
let removed_prop_ids = map_drain_filter(&mut self.tpl_properties, |_k, v| v.parent_tpl_id == id || removed_relation_ids.contains(&v.parent_tpl_id))
.keys();
// Remove objects
let _ = map_drain_filter(&mut self.data_objects, |_k, v| v.object_tpl_id == id);
// Remove property values
let _ = map_drain_filter(&mut self.data_properties, |_k, v| removed_prop_ids.contains(&v.prop_tpl_id));
// Remove relations
let _ = map_drain_filter(&mut self.data_relations, |_k, v| removed_relation_ids.contains(&v.rel_tpl_id));
// Related object remain untouched, so there can be a problem with orphans. This is up to the application to deal with.
Ok(t)
} else {
Err(StorageError::NotExist("object template"))
}
}
pub fn delete_relation_template(&mut self, id : ID) -> Result<model::RelationTemplate, StorageError> {
return if let Some(t) = self.tpl_relations.remove(&id) {
// Remove relations
let _ = map_drain_filter(&mut self.data_relations, |_k, v| v.rel_tpl_id == id).keys();
// Remove related property templates
let removed_prop_tpl_ids = map_drain_filter(&mut self.tpl_properties, |_k, v| v.parent_tpl_id == id).keys();
let _ = map_drain_filter(&mut self.data_properties, |_k, v| removed_prop_tpl_ids.contains(&v.prop_tpl_id));
// Related object remain untouched, so there can be a problem with orphans. This is up to the application to deal with.
Ok(t)
} else {
Err(StorageError::NotExist("relation template"))
}
}
pub fn delete_property_template(&mut self, id : ID) -> Result<model::PropertyTemplate, StorageError> {
return if let Some(t) = self.tpl_properties.remove(&id) {
// Remove relations
let _ = map_drain_filter(&mut self.data_properties, |_k, v| v.prop_tpl_id == id);
Ok(t)
} else {
Err(StorageError::NotExist("property template"))
}
}
}
fn map_drain_filter<K : Eq + Hash, V>(map : &mut HashMap<K, V>, filter : impl Fn(&K, &V) -> bool) -> Vec<(K, V)> {
let mut removed = vec![];
let mut retain = vec![];
for (k, v) in map.drain() {
if filter(&k, &v) {
removed.push((k, v));
} else {
retain.push((k, v));
}
}
map.extend(retain);
removed
}
trait KVVecToKeysOrValues<K, V> {
fn keys(self) -> Vec<K>;
fn values(self) -> Vec<V>;
}
impl<K, V> KVVecToKeysOrValues<K, V> for Vec<(K,V)> {
fn keys(self) -> Vec<K> {
self.into_iter().map(|(k, _v)| k).collect()
}
fn values(self) -> Vec<V> {
self.into_iter().map(|(_k, v)| v).collect()
}
}