333 lines
9.7 KiB
Rust
333 lines
9.7 KiB
Rust
use crate::db::errors::DataError;
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use crate::db::schema::convert_i32;
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use byteorder::LittleEndian;
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use sled::transaction::abort;
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use sled::transaction::TransactionalTree;
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use sled::Tree;
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use std::collections::HashMap;
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use std::str;
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use zerocopy::byteorder::I32;
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use zerocopy::AsBytes;
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const METADATA_KEY: &'static str = "metadata";
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const VARIABLE_COUNT_KEY: &'static str = "variable_count";
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#[derive(Clone)]
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pub struct Variables(pub(crate) Tree);
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fn to_key(room_id: &str, username: &str, variable_name: &str) -> Vec<u8> {
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let mut key = vec![];
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key.extend_from_slice(room_id.as_bytes());
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key.extend_from_slice(username.as_bytes());
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key.extend_from_slice(variable_name.as_bytes());
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key
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}
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fn metadata_key(room_id: &str, username: &str, metadata_key: &str) -> Vec<u8> {
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let mut key = vec![];
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key.extend_from_slice(room_id.as_bytes());
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key.extend_from_slice(METADATA_KEY.as_bytes());
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key.extend_from_slice(username.as_bytes());
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key.extend_from_slice(metadata_key.as_bytes());
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key
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}
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fn room_variable_count_key(room_id: &str, username: &str) -> Vec<u8> {
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metadata_key(room_id, username, VARIABLE_COUNT_KEY)
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}
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fn to_prefix(room_id: &str, username: &str) -> Vec<u8> {
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let mut prefix = vec![];
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prefix.extend_from_slice(room_id.as_bytes());
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prefix.extend_from_slice(username.as_bytes());
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prefix
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}
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/// Use a transaction to atomically alter the count of variables in
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/// the database by the given amount. Count cannot go below 0.
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fn alter_room_variable_count(
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variables: &TransactionalTree,
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room_id: &str,
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username: &str,
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amount: i32,
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) -> Result<i32, DataError> {
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let key = room_variable_count_key(room_id, username);
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let mut new_count = match variables.get(&key)? {
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Some(bytes) => convert_i32(&bytes)? + amount,
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None => amount,
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};
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if new_count < 0 {
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new_count = 0;
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}
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let db_value: I32<LittleEndian> = I32::new(new_count);
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variables.insert(key, db_value.as_bytes())?;
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Ok(new_count)
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}
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impl Variables {
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pub fn get_user_variables(
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&self,
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room_id: &str,
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username: &str,
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) -> Result<HashMap<String, i32>, DataError> {
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let prefix = to_prefix(&room_id, &username);
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let prefix_len: usize = prefix.len();
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let variables: Result<Vec<_>, DataError> = self
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.0
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.scan_prefix(prefix)
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.map(|entry| match entry {
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Ok((key, raw_value)) => {
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//Strips room and username from key, leaving behind name.
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let variable_name = str::from_utf8(&key[prefix_len..])?;
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Ok((variable_name.to_owned(), convert_i32(&raw_value)?))
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}
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Err(e) => Err(e.into()),
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})
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.collect();
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//Convert I32 to hash map. Can we do this in the first mapping
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//step instead? For some reason this is faster.
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variables.map(|entries| entries.into_iter().collect())
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}
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pub fn get_variable_count(&self, room_id: &str, username: &str) -> Result<i32, DataError> {
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let key = room_variable_count_key(room_id, username);
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if let Some(raw_value) = self.0.get(&key)? {
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convert_i32(&raw_value)
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} else {
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Ok(0)
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}
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}
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pub fn get_user_variable(
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&self,
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room_id: &str,
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username: &str,
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variable_name: &str,
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) -> Result<i32, DataError> {
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let key = to_key(room_id, username, variable_name);
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if let Some(raw_value) = self.0.get(&key)? {
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convert_i32(&raw_value)
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} else {
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Err(DataError::KeyDoesNotExist(String::from_utf8(key).unwrap()))
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}
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}
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pub fn set_user_variable(
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&self,
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room_id: &str,
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username: &str,
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variable_name: &str,
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value: i32,
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) -> Result<(), DataError> {
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self.0
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.transaction(|tx| {
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let key = to_key(room_id, username, variable_name);
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let db_value: I32<LittleEndian> = I32::new(value);
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let old_value = tx.insert(key, db_value.as_bytes())?;
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//Only increment variable count on new keys.
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if let None = old_value {
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match alter_room_variable_count(&tx, room_id, username, 1) {
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Err(e) => abort(e),
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_ => Ok(()),
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}
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} else {
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Ok(())
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}
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})
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.map_err(|e| e.into())
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}
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pub fn delete_user_variable(
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&self,
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room_id: &str,
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username: &str,
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variable_name: &str,
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) -> Result<(), DataError> {
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self.0
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.transaction(|tx| {
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let key = to_key(room_id, username, variable_name);
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if let Some(_) = tx.remove(key.clone())? {
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match alter_room_variable_count(&tx, room_id, username, -1) {
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Err(e) => abort(e),
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_ => Ok(()),
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}
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} else {
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abort(DataError::KeyDoesNotExist(String::from_utf8(key).unwrap()))
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}
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})
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.map_err(|e| e.into())
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use tempfile::tempdir;
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fn create_test_instance() -> Variables {
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Variables(
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sled::open(&tempdir().unwrap())
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.unwrap()
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.open_tree("variables")
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.unwrap(),
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)
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}
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//Room Variable count tests
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#[test]
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fn alter_room_variable_count_test() {
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let variables = create_test_instance();
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let alter_count = |amount: i32| {
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variables
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.0
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.transaction(|tx| {
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match alter_room_variable_count(&tx, "room", "username", amount) {
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Err(e) => abort(e),
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_ => Ok(()),
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}
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})
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.expect("got transaction failure");
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};
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fn get_count(variables: &Variables) -> i32 {
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variables
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.get_variable_count("room", "username")
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.expect("could not get variable count")
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}
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//addition
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alter_count(5);
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assert_eq!(5, get_count(&variables));
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//subtraction
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alter_count(-3);
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assert_eq!(2, get_count(&variables));
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}
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#[test]
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fn alter_room_variable_count_cannot_go_below_0_test() {
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let variables = create_test_instance();
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variables
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.0
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.transaction(
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|tx| match alter_room_variable_count(&tx, "room", "username", -1000) {
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Err(e) => abort(e),
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_ => Ok(()),
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},
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)
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.expect("got transaction failure");
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let count = variables
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.get_variable_count("room", "username")
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.expect("could not get variable count");
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assert_eq!(0, count);
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}
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#[test]
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fn empty_db_reports_0_room_variable_count_test() {
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let variables = create_test_instance();
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let count = variables
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.get_variable_count("room", "username")
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.expect("could not get variable count");
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assert_eq!(0, count);
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}
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#[test]
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fn set_user_variable_increments_count() {
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let variables = create_test_instance();
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variables
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.set_user_variable("room", "username", "myvariable", 5)
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.expect("could not insert variable");
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let count = variables
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.get_variable_count("room", "username")
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.expect("could not get variable count");
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assert_eq!(1, count);
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}
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#[test]
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fn update_user_variable_does_not_increment_count() {
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let variables = create_test_instance();
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variables
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.set_user_variable("room", "username", "myvariable", 5)
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.expect("could not insert variable");
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variables
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.set_user_variable("room", "username", "myvariable", 10)
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.expect("could not update variable");
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let count = variables
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.get_variable_count("room", "username")
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.expect("could not get variable count");
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assert_eq!(1, count);
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}
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// Set/get/delete variable tests
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#[test]
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fn set_and_get_variable_test() {
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let variables = create_test_instance();
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variables
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.set_user_variable("room", "username", "myvariable", 5)
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.expect("could not insert variable");
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let value = variables
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.get_user_variable("room", "username", "myvariable")
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.expect("could not get value");
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assert_eq!(5, value);
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}
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#[test]
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fn delete_variable_test() {
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let variables = create_test_instance();
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variables
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.set_user_variable("room", "username", "myvariable", 5)
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.expect("could not insert variable");
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variables
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.delete_user_variable("room", "username", "myvariable")
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.expect("could not delete value");
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let result = variables.get_user_variable("room", "username", "myvariable");
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assert!(result.is_err());
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assert!(matches!(result, Err(DataError::KeyDoesNotExist(_))));
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}
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#[test]
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fn get_missing_variable_returns_key_does_not_exist() {
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let variables = create_test_instance();
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let result = variables.get_user_variable("room", "username", "myvariable");
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assert!(result.is_err());
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assert!(matches!(result, Err(DataError::KeyDoesNotExist(_))));
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}
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#[test]
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fn remove_missing_variable_returns_key_does_not_exist() {
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let variables = create_test_instance();
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let result = variables.delete_user_variable("room", "username", "myvariable");
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assert!(result.is_err());
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assert!(matches!(result, Err(DataError::KeyDoesNotExist(_))));
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}
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}
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