ejdb 0.4.1

Bindings for EJDB, and embedded JSON database
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161

//! Contains low-level utilities for conversion between Rust and EJDB BSON representations.
//!
//! This module is only public to facilitate direct usage of `ejdb-sys` library, if such
//! need arises. The types provided here are useful for converting Rust BSON values
//! to EJDB ones and vice versa.
//!
//! Types from this module should not be used unless absolutely necessary.

use std::slice;

use bson::oid;
use bson::{self, DecoderResult, Document, EncoderResult};
use ejdb_sys;

pub struct EjdbBsonDocument(*mut ejdb_sys::bson);

impl EjdbBsonDocument {
    pub fn empty() -> EjdbBsonDocument {
        unsafe {
            // TODO: check for alloc errors properly
            let bson_ptr = ejdb_sys::bson_create();
            if bson_ptr.is_null() {
                panic!("Cannot allocate new BSON document");
            }
            ejdb_sys::bson_init(bson_ptr);
            EjdbBsonDocument::from_ptr(bson_ptr)
        }
    }

    #[inline]
    pub unsafe fn from_ptr(ptr: *mut ejdb_sys::bson) -> EjdbBsonDocument {
        EjdbBsonDocument(ptr)
    }

    #[inline]
    pub fn from_buffer(buf: &[u8]) -> EjdbBsonDocument {
        unsafe {
            EjdbBsonDocument(ejdb_sys::bson_create_from_buffer(
                buf.as_ptr() as *const _,
                buf.len() as i32,
            ))
        }
    }

    pub fn from_bson(bson: &Document) -> EncoderResult<EjdbBsonDocument> {
        let mut buffer = Vec::new();
        bson::encode_document(&mut buffer, bson).map(|_| EjdbBsonDocument::from_buffer(&buffer))
    }

    pub fn to_bson(&self) -> DecoderResult<Document> {
        let buf_ptr = unsafe { ejdb_sys::bson_data(self.0 as *const _) as *const u8 };
        let buf_size = unsafe { ejdb_sys::bson_size(self.0 as *const _) };

        let mut buf = unsafe { slice::from_raw_parts(buf_ptr, buf_size as usize) };
        bson::decode_document(&mut buf)
    }

    #[inline]
    pub fn as_raw(&self) -> *const ejdb_sys::bson {
        self.0 as *const _
    }

    #[inline]
    pub fn as_raw_mut(&mut self) -> *mut ejdb_sys::bson {
        self.0 as *mut _
    }
}

impl Drop for EjdbBsonDocument {
    fn drop(&mut self) {
        unsafe {
            ejdb_sys::bson_del(self.0);
        }
    }
}

#[derive(Copy, Clone)]
pub struct EjdbObjectId(ejdb_sys::bson_oid_t);

impl EjdbObjectId {
    #[inline]
    pub fn empty() -> EjdbObjectId {
        let empty_arr: [i8; 12] = [0; 12];
        EjdbObjectId(ejdb_sys::bson_oid_t { bytes: empty_arr })
    }

    #[inline]
    pub fn to_rust(self) -> oid::ObjectId {
        let bytes: [i8; 12];
        unsafe {
            bytes = (self.0).bytes;
        }
        oid::ObjectId::with_bytes(to_u(bytes))
    }

    #[inline]
    pub fn from_rust(oid: oid::ObjectId) -> EjdbObjectId {
        EjdbObjectId(ejdb_sys::bson_oid_t {
            bytes: to_i(oid.bytes()),
        })
    }

    #[inline]
    pub fn to_ejdb(self) -> ejdb_sys::bson_oid_t {
        self.0
    }

    #[inline]
    pub fn as_raw(&self) -> *const ejdb_sys::bson_oid_t {
        &self.0
    }

    #[inline]
    pub fn as_raw_mut(&mut self) -> *mut ejdb_sys::bson_oid_t {
        &mut self.0
    }
}

impl From<ejdb_sys::bson_oid_t> for EjdbObjectId {
    #[inline]
    fn from(oid: ejdb_sys::bson_oid_t) -> EjdbObjectId {
        EjdbObjectId(oid)
    }
}

impl From<oid::ObjectId> for EjdbObjectId {
    #[inline]
    fn from(oid: oid::ObjectId) -> EjdbObjectId {
        EjdbObjectId::from_rust(oid)
    }
}

impl Into<ejdb_sys::bson_oid_t> for EjdbObjectId {
    #[inline]
    fn into(self) -> ejdb_sys::bson_oid_t {
        self.to_ejdb()
    }
}

impl Into<oid::ObjectId> for EjdbObjectId {
    #[inline]
    fn into(self) -> oid::ObjectId {
        self.to_rust()
    }
}

fn to_i(arr: [u8; 12]) -> [i8; 12] {
    let mut result: [i8; 12] = [0; 12];
    for i in 0..arr.len() {
        result[i] = arr[i] as i8;
    }
    return result;
}

fn to_u(arr: [i8; 12]) -> [u8; 12] {
    let mut result: [u8; 12] = [0; 12];
    for i in 0..arr.len() {
        result[i] = arr[i] as u8;
    }
    return result;
}