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#![feature(specialization, try_from)] use std::convert::TryFrom; use std::fs::File; use std::io; use std::io::{ErrorKind, Write, Seek}; use memmap::Mmap; use pyo3::prelude::*; use pyo3::{IntoPyTuple, PyRawObject}; use pyo3::{PyIterProtocol, PyMappingProtocol, PyContextProtocol}; use pyo3::{PyGCProtocol, PyVisit, PyTraverseError}; use pyo3::types::{PyBytes, PyType, PyObjectRef}; use pyo3::types::exceptions as exc; use cordoba::{CDBReader, CDBWriter, IterState, LookupState}; #[pyclass] pub struct Reader { inner: CDBReader<Mmap>, } #[pymethods] impl Reader { #[new] fn __new__(obj: &PyRawObject, fname: PyObject, py: Python) -> PyResult<()> { let path : &str = py.import("os")?.call1("fsdecode", (fname,))?.extract()?; let file = File::open(path)?; let map = unsafe { Mmap::map(&file) }?; let reader = CDBReader::new(map)?; obj.init(|| Reader { inner: reader }) } fn get_all(&self, key: &PyBytes) -> LookupIter { LookupIter{reader: self.into(), key: key.into(), state: LookupState::new(&self.inner, key.as_bytes())} } } #[pyproto] impl PyMappingProtocol for Reader { fn __getitem__(&self, key: &PyBytes) -> PyResult<PyObject> { let gil = Python::acquire_gil(); let py = gil.python(); match self.inner.get(key.as_bytes()) { Some(Ok(r)) => Ok(PyBytes::new(py, &r).into()), Some(Err(e)) => Err(e.into()), None => Err(exc::KeyError::py_err(key.to_object(py))), } } } #[pyclass] pub struct FileIter { reader: Py<Reader>, state: IterState, } #[pyproto] impl PyIterProtocol for FileIter { fn __iter__(&mut self) -> PyResult<PyObject> { Ok(self.into()) } fn __next__(&mut self) -> PyResult<Option<PyObject>> { let gil = Python::acquire_gil(); let py = gil.python(); match self.state.next(&self.reader.as_ref(py).inner) { Some(Ok((k, v))) => { Ok(Some((PyBytes::new(py, k), PyBytes::new(py, v)).into_tuple(py).into())) } Some(Err(e)) => Err(e.into()), None => Ok(None), } } } #[pyclass] struct LookupIter { reader: Py<Reader>, key: Py<PyBytes>, state: LookupState, } #[pyproto] impl PyIterProtocol for LookupIter { fn __iter__(&mut self) -> PyResult<PyObject> { Ok(self.into()) } fn __next__(&mut self) -> PyResult<Option<PyObject>> { let gil = Python::acquire_gil(); let py = gil.python(); match self.state.next(&self.reader.as_ref(py).inner, self.key.as_ref(py).as_bytes()) { Some(Ok(v)) => { Ok(Some(PyBytes::new(py, v).into())) } Some(Err(e)) => Err(e.into()), None => Ok(None), } } } #[pyproto] impl PyIterProtocol for Reader { fn __iter__(&mut self) -> PyResult<FileIter> { Ok(FileIter{reader: self.into(), state: Default::default() }) } } #[pyclass(gc)] pub struct Writer { inner: Option<CDBWriter<PyFile>>, } struct PyFile(PyObject); impl Write for PyFile { fn write(&mut self, data: &[u8]) -> io::Result<usize> { let gil = Python::acquire_gil(); let py = gil.python(); let written = self.0.call_method1(py, "write", (PyBytes::new(py, data),))?; let res: usize = written.extract(py).map_err(|_| ErrorKind::InvalidData)?; Ok(res) } fn flush(&mut self) -> io::Result<()> { let gil = Python::acquire_gil(); let py = gil.python(); self.0.call_method0(py, "flush")?; Ok(()) } } impl Seek for PyFile { fn seek(&mut self, from: io::SeekFrom) -> io::Result<u64> { let seek_args = match from { io::SeekFrom::Start(pos) => { (i64::try_from(pos).map_err(|_| ErrorKind::InvalidData)?, 0) } io::SeekFrom::Current(pos) => (pos, 1), io::SeekFrom::End(pos) => (pos, 2), }; let gil = Python::acquire_gil(); let py = gil.python(); let cur_pos = self.0.call_method1(py, "seek", seek_args)?; let res : u64 = cur_pos.extract(py).map_err(|_| ErrorKind::InvalidData)?; Ok(res) } } #[pymethods] impl Writer { #[new] fn __new__(obj: &PyRawObject, file: PyObject) -> PyResult<()> { let writer = CDBWriter::new(PyFile(file))?; obj.init(|| Writer { inner: Some(writer) }) } fn close(&mut self) -> PyResult<()> { let writer = self.inner.take() .ok_or_else(|| Self::closed_exc())?; writer.finish()?; Ok(()) } } impl Writer { #[inline] fn closed_exc() -> PyErr { exc::ValueError::py_err("Writer is closed") } } #[pyproto] impl PyMappingProtocol for Writer { fn __setitem__(&mut self, key: &PyBytes, value: &PyBytes) -> PyResult<()> { match &mut self.inner { Some(ref mut w) => w.write(key.as_bytes(), value.as_bytes()).map_err(|e| e.into()), None => Err(Self::closed_exc()) } } } #[pyproto] impl PyGCProtocol for Writer { fn __traverse__(&self, visit: PyVisit) -> Result<(), PyTraverseError> { if let Some(ref writer) = self.inner { visit.call(&writer.get_file().0)? } Ok(()) } fn __clear__(&mut self) { self.inner.take(); } } #[pyproto] impl<'p> PyContextProtocol<'p> for Writer { fn __enter__(&mut self) -> PyResult<PyObject> { Ok(self.into()) } fn __exit__(&mut self, ty: Option<&'p PyType>, _value: Option<&'p PyObjectRef>, _traceback: Option<&'p PyObjectRef>, ) -> PyResult<bool> { if ty.is_none() { self.close()?; } Ok(false) } } #[pymodule] fn cordoba(_py: Python, m: &PyModule) -> PyResult<()> { m.add_class::<Reader>()?; m.add_class::<Writer>()?; m.add_class::<FileIter>()?; m.add_class::<LookupIter>()?; Ok(()) }