prosody
58083329903d
util/dbuffer.lua

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util/dbuffer.lua @ 13227:58083329903d

mod_muc_mam: Use period option method
author Kim Alvefur <zash@zash.se>
date Tue, 18 Jul 2023 12:33:51 +0200
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
12975
d10957394a3c util: Prefix module imports with prosody namespace
Kim Alvefur <zash@zash.se>
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1 local queue = require "prosody.util.queue";
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2
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3 local s_byte, s_sub = string.byte, string.sub;
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4 local dbuffer_methods = {};
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5 local dynamic_buffer_mt = { __name = "dbuffer", __index = dbuffer_methods };
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6
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7 function dbuffer_methods:write(data)
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8 if self.max_size and #data + self._length > self.max_size then
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9 return nil;
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10 end
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11 local ok = self.items:push(data);
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12 if not ok then
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13 self:collapse();
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14 ok = self.items:push(data);
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15 end
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16 if not ok then
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17 return nil;
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18 end
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19 self._length = self._length + #data;
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20 return true;
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21 end
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22
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23 function dbuffer_methods:read_chunk(requested_bytes)
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24 local chunk, consumed = self.items:peek(), self.front_consumed;
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25 if not chunk then return; end
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26 local chunk_length = #chunk;
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27 local remaining_chunk_length = chunk_length - consumed;
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28 if not requested_bytes then
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29 requested_bytes = remaining_chunk_length;
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30 end
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31 if remaining_chunk_length <= requested_bytes then
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32 self.front_consumed = 0;
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33 self._length = self._length - remaining_chunk_length;
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34 self.items:pop();
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35 assert(#chunk:sub(consumed + 1, -1) == remaining_chunk_length);
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36 return chunk:sub(consumed + 1, -1), remaining_chunk_length;
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37 end
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38 local end_pos = consumed + requested_bytes;
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39 self.front_consumed = end_pos;
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40 self._length = self._length - requested_bytes;
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41 assert(#chunk:sub(consumed + 1, end_pos) == requested_bytes);
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42 return chunk:sub(consumed + 1, end_pos), requested_bytes;
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43 end
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44
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45 function dbuffer_methods:read(requested_bytes)
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46 local chunks;
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47
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48 if requested_bytes and requested_bytes > self._length then
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49 return nil;
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50 end
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51
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52 local chunk, read_bytes = self:read_chunk(requested_bytes);
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53 if not requested_bytes then
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54 return chunk;
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55 elseif chunk then
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56 requested_bytes = requested_bytes - read_bytes;
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57 if requested_bytes == 0 then -- Already read everything we need
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58 return chunk;
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59 end
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60 chunks = {};
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61 else
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62 return nil;
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63 end
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64
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65 -- Need to keep reading more chunks
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66 while chunk do
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67 table.insert(chunks, chunk);
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68 if requested_bytes > 0 then
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69 chunk, read_bytes = self:read_chunk(requested_bytes);
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70 requested_bytes = requested_bytes - read_bytes;
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71 else
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72 break;
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73 end
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74 end
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75
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76 return table.concat(chunks);
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77 end
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78
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79 -- Read to, and including, the specified character sequence (return nil if not found)
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80 function dbuffer_methods:read_until(char)
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81 local buffer_pos = 0;
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82 for i, chunk in self.items:items() do
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83 local start = 1 + ((i == 1) and self.front_consumed or 0);
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84 local char_pos = chunk:find(char, start, true);
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85 if char_pos then
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86 return self:read(1 + buffer_pos + char_pos - start);
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87 end
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88 buffer_pos = buffer_pos + #chunk - (start - 1);
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89 end
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90 return nil;
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91 end
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92
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93 function dbuffer_methods:discard(requested_bytes)
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94 if self._length == 0 then return true; end
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95 if not requested_bytes or requested_bytes >= self._length then
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96 self.front_consumed = 0;
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97 self._length = 0;
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98 for _ in self.items:consume() do end
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99 return true;
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100 end
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101
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102 local chunk, read_bytes = self:read_chunk(requested_bytes);
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103 requested_bytes = requested_bytes - read_bytes;
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104 if requested_bytes == 0 then -- Already read everything we need
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105 return true;
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106 end
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107
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108 while chunk do
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109 if requested_bytes > 0 then
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110 chunk, read_bytes = self:read_chunk(requested_bytes);
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111 requested_bytes = requested_bytes - read_bytes;
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112 else
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113 break;
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114 end
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115 end
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116 return true;
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117 end
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118
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119 -- Normalize i, j into absolute offsets within the
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120 -- front chunk (accounting for front_consumed), and
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121 -- ensure there is enough data in the first chunk
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122 -- to cover any subsequent :sub() or :byte() operation
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123 function dbuffer_methods:_prep_sub(i, j)
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124 if j == nil then
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125 j = -1;
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126 end
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127 if j < 0 then
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128 j = self._length + (j+1);
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129 end
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130 if i < 0 then
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131 i = self._length + (i+1);
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132 end
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133 if i < 1 then
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134 i = 1;
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135 end
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136 if j > self._length then
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137 j = self._length;
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138 end
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139 if i > j then
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140 return nil;
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141 end
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142
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143 self:collapse(j);
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144
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145 if self.front_consumed > 0 then
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146 i = i + self.front_consumed;
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147 j = j + self.front_consumed;
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148 end
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149
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150 return i, j;
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151 end
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152
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153 function dbuffer_methods:sub(i, j)
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154 i, j = self:_prep_sub(i, j);
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155 if not i then
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156 return "";
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157 end
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158 return s_sub(self.items:peek(), i, j);
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159 end
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160
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161 function dbuffer_methods:byte(i, j)
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162 i = i or 1;
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163 j = j or i;
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164 i, j = self:_prep_sub(i, j);
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165 if not i then
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166 return;
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167 end
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168 return s_byte(self.items:peek(), i, j);
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169 end
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170
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171 function dbuffer_methods:length()
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172 return self._length;
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173 end
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174 dbuffer_methods.len = dbuffer_methods.length; -- strings have :len()
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175 dynamic_buffer_mt.__len = dbuffer_methods.length; -- support # operator
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176
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177 function dbuffer_methods:collapse(bytes)
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178 bytes = bytes or self._length;
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179
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180 local front_chunk = self.items:peek();
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181
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182 if not front_chunk or #front_chunk - self.front_consumed >= bytes then
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183 return;
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184 end
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185
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186 local front_chunks = { front_chunk:sub(self.front_consumed+1) };
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187 local front_bytes = #front_chunks[1];
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188
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189 while front_bytes < bytes do
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190 self.items:pop();
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191 local chunk = self.items:peek();
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192 front_bytes = front_bytes + #chunk;
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193 table.insert(front_chunks, chunk);
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194 end
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195 self.items:replace(table.concat(front_chunks));
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196 self.front_consumed = 0;
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197 end
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198
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199 local function new(max_size, max_chunks)
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200 if max_size and max_size <= 0 then
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201 return nil;
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202 end
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203 return setmetatable({
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204 front_consumed = 0;
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205 _length = 0;
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206 max_size = max_size;
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207 items = queue.new(max_chunks or 32);
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208 }, dynamic_buffer_mt);
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209 end
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210
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211 return {
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212 new = new;
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213 };