190 lines
8.8 KiB
Rust
190 lines
8.8 KiB
Rust
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use super::entry::EntryValue;
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use super::inner::models::Entry;
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use super::inner::schema::data;
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use super::lang::{Query, QueryComponent, QueryPart, QueryQualifier};
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use crate::database::inner::models;
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use crate::diesel::IntoSql;
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use crate::diesel::RunQueryDsl;
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use crate::diesel::{ExpressionMethods, TextExpressionMethods};
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use anyhow::Result;
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use diesel::expression::grouped::Grouped;
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use diesel::expression::operators::{And, Not, Or};
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use diesel::sql_types::Bool;
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use diesel::sqlite::Sqlite;
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use diesel::{debug_query, BoxableExpression, QueryDsl};
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use diesel::{
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r2d2::{ConnectionManager, PooledConnection},
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SqliteConnection,
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};
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use log::trace;
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#[derive(Debug, Clone)]
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pub struct QueryExecutionError(String);
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impl std::fmt::Display for QueryExecutionError {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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write!(f, "{}", self.0)
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}
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}
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impl std::error::Error for QueryExecutionError {}
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pub fn execute(
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connection: &PooledConnection<ConnectionManager<SqliteConnection>>,
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query: Query,
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) -> Result<Vec<Entry>> {
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use crate::database::inner::schema::data::dsl::*;
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let db_query = data.filter(to_sqlite_predicates(query)?);
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trace!("DB query: {}", debug_query(&db_query));
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db_query.load::<models::Entry>(connection).map_err(anyhow::Error::from)
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}
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type Predicate = dyn BoxableExpression<data::table, Sqlite, SqlType = Bool>;
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fn to_sqlite_predicates(query: Query) -> Result<Box<Predicate>, QueryExecutionError> {
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match query {
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Query::SingleQuery(qp) => match qp {
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QueryPart::Matches(eq) => {
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let mut subqueries: Vec<Box<Predicate>> = vec![];
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match &eq.entity {
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QueryComponent::Exact(q_entity) => {
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subqueries.push(Box::new(data::entity.eq(q_entity.encode().map_err(
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|e| QueryExecutionError(format!("failed producing sql: {e}")),
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)?)))
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}
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QueryComponent::In(q_entities) => {
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let entities: Result<Vec<_>, _> =
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q_entities.iter().map(|t| t.encode()).collect();
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subqueries.push(Box::new(data::entity.eq_any(entities.map_err(|e| {
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QueryExecutionError(format!("failed producing sql: {e}"))
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})?)))
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}
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QueryComponent::Contains(q_entity) => subqueries.push(Box::new(
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data::entity_searchable.like(format!("%{}%", q_entity)),
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)),
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QueryComponent::Any => {}
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};
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match &eq.attribute {
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QueryComponent::Exact(q_attribute) => {
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subqueries.push(Box::new(data::attribute.eq(q_attribute.0.clone())))
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}
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QueryComponent::In(q_attributes) => subqueries.push(Box::new(
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data::attribute.eq_any(q_attributes.iter().map(|a| &a.0).cloned()),
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)),
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QueryComponent::Contains(q_attribute) => subqueries
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.push(Box::new(data::attribute.like(format!("%{}%", q_attribute)))),
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QueryComponent::Any => {}
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};
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match &eq.value {
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QueryComponent::Exact(q_value) => match q_value {
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EntryValue::Number(n) => subqueries.push(Box::new(data::value_num.eq(*n))),
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_ => subqueries.push(Box::new(data::value_str.eq(
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q_value.to_string().map_err(|e| {
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QueryExecutionError(format!("failed producing sql: {e}"))
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})?,
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))),
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},
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QueryComponent::In(q_values) => {
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let first = q_values.first().ok_or_else(|| {
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QueryExecutionError(
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"Malformed expression: Inner value cannot be empty.".into(),
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)
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})?;
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match first {
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EntryValue::Number(_) => subqueries.push(Box::new(
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data::value_num.eq_any(
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q_values
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.iter()
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.map(|v| {
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if let EntryValue::Number(n) = v {
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Ok(*n)
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} else {
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Err(QueryExecutionError(format!("IN queries must not combine numeric and string values! ({v} is not a number)")))
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}
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})
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.collect::<Result<Vec<f64>, QueryExecutionError>>()?,
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),
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)),
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_ => subqueries.push(Box::new(
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data::value_str.eq_any(
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q_values
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.iter()
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.map(|v| {
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if let EntryValue::Number(_) = v {
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Err(QueryExecutionError(format!("IN queries must not combine numeric and string values! (Found {v})")))
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} else {
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v.to_string().map_err(|e| QueryExecutionError(format!("failed producing sql: {e}")))
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}
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})
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.collect::<Result<Vec<String>, QueryExecutionError>>()?,
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),
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)),
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}
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}
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QueryComponent::Contains(q_value) => {
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subqueries.push(Box::new(data::value_str.like(format!("S%{}%", q_value))))
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}
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QueryComponent::Any => {}
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};
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match subqueries.len() {
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0 => Ok(Box::new(true.into_sql::<Bool>())),
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1 => Ok(subqueries.remove(0)),
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_ => {
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let mut result: Box<And<Box<Predicate>, Box<Predicate>>> =
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Box::new(And::new(subqueries.remove(0), subqueries.remove(0)));
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while !subqueries.is_empty() {
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result = Box::new(And::new(result, subqueries.remove(0)));
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}
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Ok(Box::new(result))
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}
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}
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}
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QueryPart::Type(_) => unimplemented!("Type queries are not yet implemented."),
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},
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Query::MultiQuery(mq) => {
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let subqueries: Result<Vec<Box<Predicate>>, QueryExecutionError> = mq
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.queries
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.into_iter()
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.map(|sq| to_sqlite_predicates(*sq))
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.collect();
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let mut subqueries: Vec<Box<Predicate>> = subqueries?;
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match subqueries.len() {
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0 => Ok(Box::new(true.into_sql::<Bool>())),
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1 => {
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if let QueryQualifier::Not = mq.qualifier {
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Ok(Box::new(Not::new(subqueries.remove(0))))
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} else {
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Ok(subqueries.remove(0))
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}
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}
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_ => match mq.qualifier {
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QueryQualifier::And => {
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let mut result: Box<And<Box<Predicate>, Box<Predicate>>> =
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Box::new(And::new(subqueries.remove(0), subqueries.remove(0)));
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while !subqueries.is_empty() {
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result = Box::new(And::new(result, subqueries.remove(0)));
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}
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Ok(Box::new(Grouped(result)))
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}
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QueryQualifier::Or => {
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let mut result =
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Box::new(Or::new(subqueries.remove(0), subqueries.remove(0)));
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while !subqueries.is_empty() {
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result = Box::new(Or::new(result, subqueries.remove(0)));
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}
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Ok(Box::new(Grouped(result)))
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}
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QueryQualifier::Not => {
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Err(QueryExecutionError("NOT only takes one subquery.".into()))
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}
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},
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}
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}
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}
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}
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