author | Kim Alvefur <zash@zash.se> |
Sun, 22 Jan 2023 15:43:44 +0100 | |
changeset 12868 | 9f9633364044 |
parent 12128 | 7d985e5bc1fb |
child 12979 | d10957394a3c |
permissions | -rw-r--r-- |
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util.statistics,statsd,throttle,timer: Replace dependency on LuaSockect with util.time for precision time
Kim Alvefur <zash@zash.se>
parents:
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1 |
local time = require "util.time".now; |
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local new_metric_registry = require "util.openmetrics".new_metric_registry; |
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local render_histogram_le = require "util.openmetrics".render_histogram_le; |
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util.statistics: New library for gathering various kinds of statistics
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parents:
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-- BEGIN of Metric implementations |
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|
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parents:
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-- Gauges |
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local gauge_metric_mt = {} |
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parents:
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gauge_metric_mt.__index = gauge_metric_mt |
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parents:
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local function new_gauge_metric() |
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local metric = { value = 0 } |
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setmetatable(metric, gauge_metric_mt) |
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parents:
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return metric |
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parents:
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15 |
end |
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parents:
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function gauge_metric_mt:set(value) |
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self.value = value |
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end |
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parents:
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function gauge_metric_mt:add(delta) |
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parents:
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self.value = self.value + delta |
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end |
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parents:
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function gauge_metric_mt:reset() |
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self.value = 0 |
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parents:
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end |
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parents:
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function gauge_metric_mt:iter_samples() |
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local done = false |
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return function(_s) |
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if done then |
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return nil, true |
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end |
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parents:
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done = true |
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parents:
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return "", nil, _s.value |
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end, self |
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end |
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parents:
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-- Counters |
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local counter_metric_mt = {} |
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counter_metric_mt.__index = counter_metric_mt |
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parents:
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local function new_counter_metric() |
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local metric = { |
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_created = time(), |
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value = 0, |
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} |
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setmetatable(metric, counter_metric_mt) |
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return metric |
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parents:
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end |
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function counter_metric_mt:set(value) |
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self.value = value |
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end |
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function counter_metric_mt:add(value) |
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self.value = (self.value or 0) + value |
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end |
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|
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function counter_metric_mt:iter_samples() |
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local step = 0 |
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return function(_s) |
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step = step + 1 |
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if step == 1 then |
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return "_created", nil, _s._created |
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elseif step == 2 then |
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return "_total", nil, _s.value |
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else |
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return nil, nil, true |
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end |
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end, self |
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end |
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|
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function counter_metric_mt:reset() |
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self.value = 0 |
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parents:
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end |
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parents:
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|
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-- Histograms |
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local histogram_metric_mt = {} |
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histogram_metric_mt.__index = histogram_metric_mt |
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|
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local function new_histogram_metric(buckets) |
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local metric = { |
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_created = time(), |
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_sum = 0, |
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_count = 0, |
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} |
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-- the order of buckets matters unfortunately, so we cannot directly use |
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-- the thresholds as table keys |
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for i, threshold in ipairs(buckets) do |
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metric[i] = { |
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threshold = threshold, |
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threshold_s = render_histogram_le(threshold), |
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count = 0 |
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96 |
} |
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97 |
end |
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setmetatable(metric, histogram_metric_mt) |
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return metric |
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100 |
end |
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101 |
|
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function histogram_metric_mt:sample(value) |
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103 |
-- According to the I-D, values must be part of all buckets |
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for i, bucket in pairs(self) do |
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if "number" == type(i) and value <= bucket.threshold then |
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bucket.count = bucket.count + 1 |
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107 |
end |
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108 |
end |
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self._sum = self._sum + value |
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self._count = self._count + 1 |
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111 |
end |
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|
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function histogram_metric_mt:iter_samples() |
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local key = nil |
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return function (_s) |
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116 |
local data |
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key, data = next(_s, key) |
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if key == "_created" or key == "_sum" or key == "_count" then |
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return key, nil, data |
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elseif key ~= nil then |
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return "_bucket", {["le"] = data.threshold_s}, data.count |
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122 |
else |
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return nil, nil, nil |
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124 |
end |
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125 |
end, self |
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126 |
end |
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127 |
|
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function histogram_metric_mt:reset() |
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self._created = time() |
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self._count = 0 |
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self._sum = 0 |
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for i, bucket in pairs(self) do |
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if "number" == type(i) then |
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bucket.count = 0 |
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135 |
end |
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136 |
end |
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137 |
end |
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138 |
|
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139 |
-- Summary |
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local summary_metric_mt = {} |
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summary_metric_mt.__index = summary_metric_mt |
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142 |
|
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143 |
local function new_summary_metric() |
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144 |
-- quantiles are not supported yet |
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local metric = { |
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_created = time(), |
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_sum = 0, |
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148 |
_count = 0, |
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149 |
} |
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150 |
setmetatable(metric, summary_metric_mt) |
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151 |
return metric |
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152 |
end |
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153 |
|
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154 |
function summary_metric_mt:sample(value) |
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self._sum = self._sum + value |
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self._count = self._count + 1 |
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157 |
end |
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158 |
|
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159 |
function summary_metric_mt:iter_samples() |
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160 |
local key = nil |
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161 |
return function (_s) |
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162 |
local data |
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163 |
key, data = next(_s, key) |
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164 |
return key, nil, data |
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165 |
end, self |
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166 |
end |
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167 |
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168 |
function summary_metric_mt:reset() |
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169 |
self._created = time() |
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170 |
self._count = 0 |
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171 |
self._sum = 0 |
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172 |
end |
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173 |
|
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174 |
local pull_backend = { |
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175 |
gauge = new_gauge_metric, |
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176 |
counter = new_counter_metric, |
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177 |
histogram = new_histogram_metric, |
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summary = new_summary_metric, |
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179 |
} |
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180 |
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181 |
-- END of Metric implementations |
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182 |
|
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183 |
local function new() |
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184 |
return { |
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185 |
metric_registry = new_metric_registry(pull_backend), |
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186 |
} |
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187 |
end |
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188 |
|
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189 |
return { |
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190 |
new = new; |
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191 |
} |