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extern crate rmp; extern crate theban_interval_tree; extern crate memrange; use std::collections::BTreeMap; use std::u64; use std::u32; use std::io::prelude::*; use std::io::Cursor; use std::fs::File; use db::DB; use content::Bitmap; use content::Object; use dberror::DBError; use memrange::Range; use self::theban_interval_tree::IntervalTree; use std::fmt::Debug; trait Serialized where Self:Sized{ fn write<'a>(&self, mut w: &mut Write) -> Result<(), DBError<'a>>; fn read<'a>(mut r: &mut Read) -> Result<Self, DBError<'a>>; } fn write_vec<'a>(vec: &Vec<u8>, mut w: &mut Write) -> Result<(), DBError<'a>> { try!(rmp::encode::write_str_len(&mut w, vec.len() as u32)); try!(w.write_all(vec)); return Ok(()); } fn parse_string<'a>(stream: &mut Read) -> Result<String, DBError<'a>> { let strref = try!(parse_bindata(stream)); let strval = try!(String::from_utf8(strref)); return Ok(strval); } fn parse_bindata<'a>(mut stream: &mut Read) -> Result<Vec<u8>, DBError<'a>> { let len = try!(rmp::decode::read_str_len(&mut stream)); let ulen = len as usize; let mut buf: Vec<u8> = vec![0;ulen]; let n = try!(rmp::decode::read_full(&mut stream, &mut buf[0..ulen])); if n != ulen { return Err(DBError::FileFormatError("unexpected EOF".into())); } return Ok(buf); } fn parse_range<'a>(mut r: &mut Read) -> Result<Range, DBError<'a>> { let min = try!(rmp::decode::read_u64_loosely(&mut r)); let max = try!(rmp::decode::read_u64_loosely(&mut r)); return Ok(Range::new(min, max)); } impl Serialized for Bitmap { fn write<'a>(&self, mut w: &mut Write) -> Result<(), DBError<'a>> { try!(rmp::encode::write_array_len(&mut w, 2)); try!(rmp::encode::write_uint(&mut w, self.entry_size)); try!(write_vec(&self.data, &mut w)); return Ok(()) } fn read<'a>(mut r: &mut Read) -> Result<Self, DBError<'a>> { let len = try!(rmp::decode::read_array_size(&mut r)); if len != 2 { return Err(DBError::FileFormatError("BitMap should have length 2".into())); } let ds = try!(rmp::decode::read_u64_loosely(&mut r)); let vec = try!(parse_bindata(&mut r)); let data = Bitmap{entry_size: ds, data:vec}; return Ok( data ); } } impl Serialized for Object { fn write<'a>(&self, mut w: &mut Write) -> Result<(), DBError<'a>> { try!(write_vec(&self.data, &mut w)); return Ok(()) } fn read<'a>(mut r: &mut Read) -> Result<Self, DBError<'a>> { let vec = try!(parse_bindata(&mut r)); let data = Object{data: vec}; return Ok( data ); } } impl<T: Serialized> Serialized for IntervalTree<T> { fn write<'a>(&self, mut w: &mut Write) -> Result<(), DBError<'a>> { let len = self.range(0, u64::MAX).count() as u64; assert!(3*len < u32::MAX as u64); try!(rmp::encode::write_array_len(&mut w, 3*len as u32)); for (range, data) in self.range(0, u64::MAX) { try!(rmp::encode::write_uint(&mut w, range.min)); try!(rmp::encode::write_uint(&mut w, range.max)); try!(data.write(&mut w)); } return Ok(()) } fn read<'a>(mut r: &mut Read) -> Result<Self, DBError<'a>> { let len = try!(rmp::decode::read_array_size(&mut r)); let mut tree = IntervalTree::new(); for _ in 0..(len/3) { let rng = try!(parse_range(&mut r)); let data = try!(T::read(&mut r)); tree.insert(rng, data); } return Ok( tree ); } } impl<T: Serialized+Debug> Serialized for BTreeMap<String, IntervalTree<T>> { fn write<'a>(&self, mut w: &mut Write) -> Result<(), DBError<'a>> { try!(rmp::encode::write_map_len(&mut w, self.len() as u32)); for (name, tree) in self { try!(rmp::encode::write_str_len(&mut w, name.len() as u32)); try!(w.write_all(&name.as_ref())); try!(tree.write(&mut w)) } return Ok(()) } fn read<'a>(mut r: &mut Read) -> Result<Self, DBError<'a>> { let len = try!(rmp::decode::read_map_size(&mut r)); let mut res = BTreeMap::new(); for _ in 0..len { let tbl_name = try!(parse_string(&mut r)); let tree = try!(IntervalTree::<T>::read(&mut r)); res.insert(tbl_name, tree); } return Ok( res ); } } impl Serialized for DB { fn write<'a>(&self, mut w: &mut Write) -> Result<(), DBError<'a>> { try!(rmp::encode::write_array_len(&mut w, 2 as u32)); try!(self.obj_map.write(&mut w)); try!(self.bit_map.write(&mut w)); return Ok(()); } fn read<'a>(mut r: &mut Read) -> Result<Self, DBError<'a>> { let len = try!(rmp::decode::read_array_size(&mut r)); if len != 2 { return Err(DBError::FileFormatError("DB should have length 2".into())); } let objects = try!(BTreeMap::<String, IntervalTree<Object>>::read(r)); let bitmaps = try!(BTreeMap::<String, IntervalTree<Bitmap>>::read(r)); return Ok( DB::new_from_data(objects,bitmaps) ); } } impl DB { #[must_use] pub fn serialize<'a>(&self) -> Result<Vec<u8>, DBError<'a>> { let mut buf = Vec::new(); try!(self.write(&mut buf)); return Ok(buf); } #[must_use] pub fn deserialize<'a>(buf: Vec<u8>) -> Result<DB, DBError<'a>> { let db = try!(DB::read(&mut Cursor::new(buf))); return Ok(db); } #[must_use] pub fn save_to_file<'a>(&self, filename: &String) -> Result<(), DBError<'a>> { let mut f = try!(File::create(filename)); try!(self.write(&mut f)); return Ok(()); } #[must_use] pub fn new_from_file<'a>(filename: &String) -> Result<DB, DBError<'a>> { let mut f = try!(File::open(filename)); let db = try!(DB::read(&mut f)); return Ok(db); } } #[test] pub fn test_serialize_objects() { let mut db = DB::new(); let tbl = "foo".to_string(); db.insert_object(&tbl, Range::new(3, 4), Object{data: "foo".into()}); db.insert_object(&tbl, Range::new(4, 5), Object{data: "foo".into()}); db.insert_object(&tbl, Range::new(5, 6), Object{data: "foo".into()}); let bin = db.serialize().unwrap(); let db2 = DB::deserialize(bin).unwrap(); let db2_keys = db2.query_object(&tbl, Range::new(0, 100)) .unwrap() .map(|(r, _)| r.clone()) .collect::<Vec<Range>>(); let db1_keys = db.query_object(&tbl, Range::new(0, 100)) .unwrap() .map(|(r, _)| r.clone()) .collect::<Vec<Range>>(); assert_eq!(db1_keys, db2_keys); } #[test] pub fn test_serialize_bitmaps() { let mut db = DB::new(); let tbl = "too".to_string(); db.insert_bitmap(&tbl, Range::new(5, 7), Bitmap::new(1, "goo".into())); db.insert_bitmap(&tbl, Range::new(6, 8), Bitmap::new(1, "bar".into())); let bin = db.serialize().unwrap(); let db2 = DB::deserialize(bin).unwrap(); let db2_values = db2.query_bitmap(&tbl, Range::new(6, 7)) .unwrap() .map(|(_, b)| b.data.to_vec()) .collect::<Vec<Vec<u8>>>(); let db1_values = db.query_bitmap(&tbl, Range::new(6, 7)) .unwrap() .map(|(_, b)| b.data.to_vec()) .collect::<Vec<Vec<u8>>>(); assert_eq!(db1_values, db2_values); }