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
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
use bigdecimal::BigDecimal;
use bson::{decode_document, spec::BinarySubtype, Bson};
use nu_errors::{ExpectedRange, ShellError};
use nu_protocol::{Primitive, ReturnSuccess, ReturnValue, TaggedDictBuilder, UntaggedValue, Value};
use nu_source::{SpannedItem, Tag};
use std::str::FromStr;
#[derive(Default)]
pub struct FromBSON {
pub state: Vec<u8>,
pub name_tag: Tag,
}
impl FromBSON {
pub fn new() -> FromBSON {
FromBSON {
state: vec![],
name_tag: Tag::unknown(),
}
}
}
fn bson_array(input: &[Bson], tag: Tag) -> Result<Vec<Value>, ShellError> {
let mut out = vec![];
for value in input {
out.push(convert_bson_value_to_nu_value(value, &tag)?);
}
Ok(out)
}
fn convert_bson_value_to_nu_value(v: &Bson, tag: impl Into<Tag>) -> Result<Value, ShellError> {
let tag = tag.into();
let span = tag.span;
Ok(match v {
Bson::FloatingPoint(n) => UntaggedValue::Primitive(Primitive::from(*n)).into_value(&tag),
Bson::String(s) => {
UntaggedValue::Primitive(Primitive::String(String::from(s))).into_value(&tag)
}
Bson::Array(a) => UntaggedValue::Table(bson_array(a, tag.clone())?).into_value(&tag),
Bson::Document(doc) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
for (k, v) in doc.iter() {
collected.insert_value(k.clone(), convert_bson_value_to_nu_value(v, &tag)?);
}
collected.into_value()
}
Bson::Boolean(b) => UntaggedValue::Primitive(Primitive::Boolean(*b)).into_value(&tag),
Bson::Null => UntaggedValue::Primitive(Primitive::Nothing).into_value(&tag),
Bson::RegExp(r, opts) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$regex".to_string(),
UntaggedValue::Primitive(Primitive::String(String::from(r))).into_value(&tag),
);
collected.insert_value(
"$options".to_string(),
UntaggedValue::Primitive(Primitive::String(String::from(opts))).into_value(&tag),
);
collected.into_value()
}
Bson::I32(n) => UntaggedValue::int(*n).into_value(&tag),
Bson::I64(n) => UntaggedValue::int(*n).into_value(&tag),
Bson::Decimal128(n) => {
let decimal = BigDecimal::from_str(&format!("{}", n)).map_err(|_| {
ShellError::range_error(
ExpectedRange::BigDecimal,
&n.spanned(span),
"converting BSON Decimal128 to BigDecimal".to_owned(),
)
})?;
UntaggedValue::Primitive(Primitive::Decimal(decimal)).into_value(&tag)
}
Bson::JavaScriptCode(js) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$javascript".to_string(),
UntaggedValue::Primitive(Primitive::String(String::from(js))).into_value(&tag),
);
collected.into_value()
}
Bson::JavaScriptCodeWithScope(js, doc) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$javascript".to_string(),
UntaggedValue::Primitive(Primitive::String(String::from(js))).into_value(&tag),
);
collected.insert_value(
"$scope".to_string(),
convert_bson_value_to_nu_value(&Bson::Document(doc.to_owned()), tag)?,
);
collected.into_value()
}
Bson::TimeStamp(ts) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$timestamp".to_string(),
UntaggedValue::int(*ts).into_value(&tag),
);
collected.into_value()
}
Bson::Binary(bst, bytes) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$binary_subtype".to_string(),
match bst {
BinarySubtype::UserDefined(u) => UntaggedValue::int(*u),
_ => {
UntaggedValue::Primitive(Primitive::String(binary_subtype_to_string(*bst)))
}
}
.into_value(&tag),
);
collected.insert_value(
"$binary".to_string(),
UntaggedValue::Primitive(Primitive::Binary(bytes.to_owned())).into_value(&tag),
);
collected.into_value()
}
Bson::ObjectId(obj_id) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$object_id".to_string(),
UntaggedValue::Primitive(Primitive::String(obj_id.to_hex())).into_value(&tag),
);
collected.into_value()
}
Bson::UtcDatetime(dt) => UntaggedValue::Primitive(Primitive::Date(*dt)).into_value(&tag),
Bson::Symbol(s) => {
let mut collected = TaggedDictBuilder::new(tag.clone());
collected.insert_value(
"$symbol".to_string(),
UntaggedValue::Primitive(Primitive::String(String::from(s))).into_value(&tag),
);
collected.into_value()
}
})
}
fn binary_subtype_to_string(bst: BinarySubtype) -> String {
match bst {
BinarySubtype::Generic => "generic",
BinarySubtype::Function => "function",
BinarySubtype::BinaryOld => "binary_old",
BinarySubtype::UuidOld => "uuid_old",
BinarySubtype::Uuid => "uuid",
BinarySubtype::Md5 => "md5",
_ => unreachable!(),
}
.to_string()
}
#[derive(Debug)]
struct BytesReader {
pos: usize,
inner: Vec<u8>,
}
impl BytesReader {
fn new(bytes: Vec<u8>) -> BytesReader {
BytesReader {
pos: 0,
inner: bytes,
}
}
}
impl std::io::Read for BytesReader {
fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
let src: &mut &[u8] = &mut self.inner[self.pos..].as_ref();
let diff = src.read(buf)?;
self.pos += diff;
Ok(diff)
}
}
pub fn from_bson_bytes_to_value(bytes: Vec<u8>, tag: impl Into<Tag>) -> Result<Value, ShellError> {
let mut docs = Vec::new();
let mut b_reader = BytesReader::new(bytes);
while let Ok(v) = decode_document(&mut b_reader) {
docs.push(Bson::Document(v));
}
convert_bson_value_to_nu_value(&Bson::Array(docs), tag)
}
pub fn from_bson(bytes: Vec<u8>, name_tag: Tag) -> Result<Vec<ReturnValue>, ShellError> {
match from_bson_bytes_to_value(bytes, name_tag.clone()) {
Ok(x) => Ok(vec![ReturnSuccess::value(x)]),
Err(_) => Err(ShellError::labeled_error(
"Could not parse as BSON",
"input cannot be parsed as BSON",
name_tag,
)),
}
}