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use {
super::{CSVDatabase, CSVDatabaseError},
crate::{Cast, DBMut, Result, Row, Schema, WIPError},
async_trait::async_trait,
csv::WriterBuilder,
std::{fs::OpenOptions, io::Write},
};
#[async_trait(?Send)]
impl DBMut for CSVDatabase {
async fn insert_schema(&mut self, schema: &Schema) -> Result<()> {
if self.schema.is_some() {
return Err(CSVDatabaseError::OnlyOneTableAllowed.into());
}
let mut writer = WriterBuilder::new()
.delimiter(self.csv_settings.delimiter)
.from_writer(vec![]);
let header: Vec<String> = schema
.column_defs
.iter()
.map(|column_def| column_def.name.clone())
.collect();
writer
.write_record(header)
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
writer
.flush()
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
let csv_bytes = writer
.into_inner()
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
let mut file = OpenOptions::new()
.truncate(true)
.write(true)
.open(self.path.as_str())
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
file.write_all(&csv_bytes)
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
file.flush()
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
self.schema = Some(schema.clone());
Ok(())
}
async fn delete_schema(&mut self, _table_name: &str) -> Result<()> {
self.schema = None;
Ok(())
}
async fn insert_data(&mut self, _table_name: &str, rows: Vec<Row>) -> Result<()> {
let mut writer = WriterBuilder::new()
.delimiter(self.csv_settings.delimiter)
.from_writer(vec![]);
for row in rows.into_iter() {
let string_row = row
.0
.into_iter()
.map(|cell| cell.cast())
.collect::<Result<Vec<String>>>()?;
writer
.write_record(string_row)
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
}
writer
.flush()
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
let csv_bytes = writer
.into_inner()
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
let mut file = OpenOptions::new()
.append(true)
.open(self.path.as_str())
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
file.write_all(&csv_bytes)
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
file.flush()
.map_err(|error| WIPError::Debug(format!("{:?}", error)))?;
Ok(())
}
}