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The rendering code checks whether endpoint IPs are part of cluster-local networks. Due to the prevalence of endpoints - medium sized reports can contain many thousands of endpoints - this is performance critical. Alas the existing code performs the check via a linear scan of a list of networks. That is slow when there are more than a few, which will be the case in the context of k8s, since there the probes register service IPs as local /32 networks. Here we change representation of the set of networks to a prefix tree (aka trie), which is well-suited for IP network membership checks since networks are in fact a bitstring prefixes. The specific representation is a crit-bit tree, but that choice was purely based on implementation convenience - the chosen library is the only one I could find that directly supports IP networks.
23 lines
1.1 KiB
Plaintext
23 lines
1.1 KiB
Plaintext
The MIT License (MIT)
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Copyright (c) 2015 Keita Sone
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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