multisql 0.4.3

MultiSQL
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
162

use {
	crate::{Column, Glue, NullOrd, Result, Row, ValidateError, Value},
	std::cmp::Ordering,
};

macro_rules! some_or_continue {
	($option: expr) => {
		match $option {
			Some(value) => value,
			None => return Some(Ok(())),
		}
	};
}
macro_rules! some_or {
	($option: expr, $or: block) => {
		match $option {
			Some(value) => value,
			None => $or,
		}
	};
}

impl Glue {
	pub(crate) async fn validate_unique(
		&self,
		database: &Option<String>,
		table_name: &str,
		column_defs: &[Column],
		rows: &[Row],
		ignore_keys: Option<&[Value]>,
	) -> Result<()> {
		let unique_columns: Vec<usize> = column_defs
			.iter()
			.enumerate()
			.filter_map(|(index, column_def)| {
				if column_def.is_unique {
					Some(index)
				} else {
					None
				}
			})
			.collect();
		let mut existing_values: Vec<Vec<Value>> = vec![vec![]; unique_columns.len()];
		self.get_database(database)?
			.scan_data(table_name)
			.await?
			.into_iter()
			.try_for_each::<_, Result<_>>(|(key, row)| {
				if let Some(ignore_keys) = ignore_keys {
					if ignore_keys.iter().any(|ignore_key| ignore_key == &key) {
						return Ok(());
					}
				}
				let row = row.0;
				unique_columns
					.iter()
					.enumerate()
					.map(|(index, row_index)| {
						existing_values
							.get_mut(index)?
							.push(row.get(*row_index)?.clone());
						Some(())
					})
					.collect::<Option<()>>()
					.ok_or_else(|| ValidateError::UnreachableUniqueValues.into())
			})?;

		let mut new_values: Vec<Vec<Value>> = vec![vec![]; unique_columns.len()];
		rows.iter().try_for_each::<_, Result<_>>(|row| {
			unique_columns
				.iter()
				.enumerate()
				.map(|(index, row_index)| {
					new_values
						.get_mut(index)?
						.push(row.0.get(*row_index)?.clone());
					Some(())
				})
				.collect::<Option<()>>()
				.ok_or_else(|| ValidateError::UnreachableUniqueValues.into())
		})?;
		let mut existing_values_iter = existing_values.into_iter();
		new_values
			.into_iter()
			.map(|mut new_values| {
				let mut existing_values = existing_values_iter.next()?;

				existing_values.sort_unstable_by(|value_l, value_r| {
					value_l.partial_cmp(value_r).unwrap_or(Ordering::Equal)
				});
				new_values.sort_unstable_by(|value_l, value_r| {
					value_l.partial_cmp(value_r).unwrap_or(Ordering::Equal)
				});

				let mut existing_values = existing_values.into_iter();
				let mut new_values = new_values.into_iter();

				let mut new_value = some_or_continue!(new_values.next());
				let mut existing_value = some_or!(existing_values.next(), {
					loop {
						let new_new = some_or_continue!(new_values.next());
						if new_new == new_value {
							return Some(Err(ValidateError::DuplicateEntryOnUniqueField.into()));
						}
						new_value = new_new;
					}
				});

				loop {
					match existing_value.null_cmp(&new_value) {
						Some(Ordering::Equal) => {
							return Some(Err(ValidateError::DuplicateEntryOnUniqueField.into()))
						}
						Some(Ordering::Greater) => {
							let new_new = some_or_continue!(new_values.next());
							if new_new == new_value {
								return Some(
									Err(ValidateError::DuplicateEntryOnUniqueField.into()),
								);
							}
							new_value = new_new;
						}
						Some(Ordering::Less) => {
							existing_value = some_or!(existing_values.next(), {
								loop {
									let new_new = some_or_continue!(new_values.next());
									if new_new == new_value {
										return Some(Err(
											ValidateError::DuplicateEntryOnUniqueField.into(),
										));
									}
									new_value = new_new;
								}
							});
						}
						None => {
							let new_new = some_or_continue!(new_values.next());
							if new_new == new_value {
								return Some(
									Err(ValidateError::DuplicateEntryOnUniqueField.into()),
								);
							}
							new_value = new_new;
							existing_value = some_or!(existing_values.next(), {
								loop {
									let new_new = some_or_continue!(new_values.next());
									if new_new == new_value {
										return Some(Err(
											ValidateError::DuplicateEntryOnUniqueField.into(),
										));
									}
									new_value = new_new;
								}
							});
						}
					}
				}
			})
			.collect::<Option<Result<()>>>()
			.ok_or(ValidateError::UnreachableUniqueValues)?
	}
}