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https://github.com/mailscope/kumomta.git
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Wez Furlong
c085e368b2
Use the managed accessor for thundering herd protection. May help with a situation as discussed in https://github.com/KumoCorp/kumomta/pull/438
33 lines
1.1 KiB
Lua
33 lines
1.1 KiB
Lua
local kumo = require 'kumo'
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local signer = kumo.dkim.rsa_sha256_signer {
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domain = 'example.com',
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selector = 's1',
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headers = { 'From', 'To' },
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key = 'example-private-dkim-key.pem',
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}
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local function new_msg(content)
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return kumo.make_message('sender@example.com', 'recip@example.com', content)
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end
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-- Sign 100 times
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for i = 1, 100 do
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local msg = new_msg 'Subject: hello\r\n\r\nHello'
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msg:dkim_sign(signer)
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end
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-- And observe that we only loaded the key once
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local metrics = kumo.prometheus_metrics()
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-- print(kumo.serde.json_encode_pretty(metrics))
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assert(metrics.lruttl_lookup_count.value.cache_name.dkim_key_cache == 1)
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assert(metrics.lruttl_lookup_count.value.cache_name.dkim_signer_cache == 1)
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assert(metrics.lruttl_populated_count.value.cache_name.dkim_key_cache == 1)
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assert(metrics.lruttl_populated_count.value.cache_name.dkim_signer_cache == 1)
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assert(metrics.lruttl_evict_count.value.cache_name.dkim_key_cache == 0)
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assert(metrics.lruttl_evict_count.value.cache_name.dkim_signer_cache == 0)
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assert(metrics.dkim_signer_cache_lookup_count.value == 1)
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