wtx 0.43.1

A collection of different transport implementations and related tools focused primarily on web technologies.
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179

use crate::misc::{FilledBuffer, Lease, LeaseMut};
use core::ops::Range;

// ```
// [=================All=================]
//
// [===========Buffer===========|        ]
//
// [          |=======Current rest=======]
//
// [                  |==Following rest==]
//
// [Antecedent|Current|Following|Trailing]
//            |       |         |        |
//            |       |         |        |-> buffer.capacity()
//            |       |         |
//            |       |         |----------> following_end_idx (buffer.len())
//            |       |
//            |       |--------------------> current_end_idx
//            |
//            |----------------------------> antecedent_end_idx
// ```
#[derive(Debug)]
pub(crate) struct PartitionedFilledBuffer {
  antecedent_end_idx: usize,
  buffer: FilledBuffer,
  current_end_idx: usize,
}

impl PartitionedFilledBuffer {
  pub(crate) fn new() -> Self {
    Self { antecedent_end_idx: 0, buffer: FilledBuffer::default(), current_end_idx: 0 }
  }

  pub(crate) const fn antecedent_end_idx(&self) -> usize {
    self.antecedent_end_idx
  }

  pub(crate) fn all(&self) -> &[u8] {
    self.buffer.all()
  }

  pub(crate) fn clear(&mut self) {
    let Self { antecedent_end_idx, buffer, current_end_idx } = self;
    *antecedent_end_idx = 0;
    buffer.clear();
    *current_end_idx = 0;
  }

  pub(crate) fn clear_if_following_is_empty(&mut self) {
    if !self.has_following() {
      self.clear();
    }
  }

  pub(crate) fn current(&self) -> &[u8] {
    let range = self.current_range();
    self.all().get(range).unwrap_or_default()
  }

  pub(crate) const fn current_end_idx(&self) -> usize {
    self.current_end_idx
  }

  pub(crate) const fn current_range(&self) -> Range<usize> {
    self.antecedent_end_idx()..self.current_end_idx()
  }

  pub(crate) fn following_end_idx(&self) -> usize {
    self.buffer.len()
  }

  pub(crate) fn following_len(&self) -> usize {
    self.following_end_idx().wrapping_sub(self.current_end_idx())
  }

  pub(crate) fn following_rest_mut(&mut self) -> &mut [u8] {
    let idx = self.current_end_idx();
    self.buffer.all_mut().get_mut(idx..).unwrap_or_default()
  }

  pub(crate) fn has_following(&self) -> bool {
    self.following_end_idx() > self.current_end_idx()
  }

  pub(crate) fn reserve(&mut self, additional: usize) -> crate::Result<()> {
    self.buffer.reserve(additional)
  }

  pub(crate) fn set_indices(
    &mut self,
    antecedent_len: usize,
    current_len: usize,
    following_len: usize,
  ) -> crate::Result<()> {
    let [ant, cur, fol] = Self::indcs_from_lengths(antecedent_len, current_len, following_len);
    if fol > self.buffer.capacity() {
      return Err(crate::Error::InvalidPartitionedBufferBounds);
    }
    self.antecedent_end_idx = ant;
    self.current_end_idx = cur;
    self.buffer.set_len(fol);
    Ok(())
  }

  const fn indcs_from_lengths(
    antecedent_len: usize,
    current_len: usize,
    following_len: usize,
  ) -> [usize; 3] {
    let current_end_idx = antecedent_len.saturating_add(current_len);
    let following_end_idx = current_end_idx.saturating_add(following_len);
    [antecedent_len, current_end_idx, following_end_idx]
  }
}

#[cfg(any(feature = "mysql", feature = "postgres", feature = "web-socket"))]
impl PartitionedFilledBuffer {
  pub(crate) fn with_capacity(capacity: usize) -> crate::Result<Self> {
    Ok(Self {
      antecedent_end_idx: 0,
      buffer: FilledBuffer::with_capacity(capacity)?,
      current_end_idx: 0,
    })
  }
}

#[cfg(any(feature = "postgres", feature = "web-socket-handshake"))]
impl PartitionedFilledBuffer {
  pub(crate) fn suffix_writer(&mut self) -> crate::misc::SuffixWriterFbvm<'_> {
    crate::misc::SuffixWriterFbvm::new(self.following_end_idx(), self.buffer.vector_mut())
  }
}

#[cfg(feature = "web-socket")]
impl PartitionedFilledBuffer {
  pub(crate) fn current_mut(&mut self) -> &mut [u8] {
    let range = self.current_range();
    self.buffer.get_mut(range).unwrap_or_default()
  }

  pub(crate) fn current_rest_mut(&mut self) -> &mut [u8] {
    let idx = self.antecedent_end_idx();
    self.buffer.all_mut().get_mut(idx..).unwrap_or_default()
  }
}

#[cfg(feature = "web-socket-handshake")]
impl PartitionedFilledBuffer {
  pub(crate) fn all_mut(&mut self) -> &mut [u8] {
    self.buffer.all_mut()
  }

  pub(crate) fn following(&self) -> &[u8] {
    let idx = self.current_end_idx();
    self.all().get(idx..).unwrap_or_default()
  }
}

impl Lease<PartitionedFilledBuffer> for PartitionedFilledBuffer {
  #[inline]
  fn lease(&self) -> &PartitionedFilledBuffer {
    self
  }
}

impl LeaseMut<PartitionedFilledBuffer> for PartitionedFilledBuffer {
  #[inline]
  fn lease_mut(&mut self) -> &mut PartitionedFilledBuffer {
    self
  }
}

impl Default for PartitionedFilledBuffer {
  #[inline]
  fn default() -> Self {
    Self::new()
  }
}