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README.md
24
README.md
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@ -17,27 +17,3 @@ My maxim is _"Your freedom ends when it starts to confine the freedom of others"
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Looking at how Russian government [distorts TV](https://therussianreader.wordpress.com/2015/11/22/russian-truckers-strike-dagestan/) and blocks [critics of Putin](http://www.reuters.com/article/2014/03/13/us-russia-internet-idUSBREA2C21L20140313),
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I decided to write an anti-censorship extension for Chromium before they strike me first.
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## PAC-Script Performance Analysis
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```javascript
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if (Is_subdomain_of( host, blocked_hosts ))
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return 'use proxy';
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```
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You have to make `Is_subdomain_of` very fast.
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This check is executed on each request. You should watch memeory consumption too.
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The naive solution is to keep array of blocked ips and check if the host resolves to one of the ips.
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You may do it with `indexOf`, binary search, etc.
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The shortcoming of every ip solution is that __some providers resolve blocked hosts to wrong ips__, so we eventually need list of hosts.
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I have tested different solutions, and depicted [results](./benchmark/Output.txt) in the following chart:
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![Host Lookup Chart: Time-Memory, Hits-Misses](./chart/host-lookup-chart.png)
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* __IPs indexOf__ – Blocked IP is searched by `indexOf`
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* __IPs binary__ – Blocked IP is searched by binary search. For some reason miss time slightly increased.
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* __IPs switch__ – Simply `switch(Blocked_IP) { case1: ... caseN: return true }`. Works even better than binary search. Magic.
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* __Hosts switch__ – Radix trie built on `switch`. Comparable to __IPs switch__.
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25
pac-script-performance-analyses/README.md
Executable file
25
pac-script-performance-analyses/README.md
Executable file
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@ -0,0 +1,25 @@
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## PAC-Script Performance Analysis
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Somewhere in PAC-script you may want:
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```javascript
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if (Is_subdomain_of( host, blocked_hosts ))
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return 'use proxy';
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```
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You have to make `Is_subdomain_of` very fast.
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This check is executed on each request. You should watch memeory consumption too.
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The naive solution is to keep array of blocked ips and check if the host resolves to one of the ips.
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You may do it with `indexOf`, binary search, etc.
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The shortcoming of every ip solution is that __some providers resolve blocked hosts to wrong ips__, so we eventually need list of hosts.
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I have tested different solutions, and depicted [results](./benchmark/Output.txt) in the following chart:
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![Host Lookup Chart: Time-Memory, Hits-Misses](./chart/host-lookup-chart.png)
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* __IPs indexOf__ – Blocked IP is searched by `indexOf`
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* __IPs binary__ – Blocked IP is searched by binary search. For some reason miss time slightly increased.
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* __IPs switch__ – Simply `switch(Blocked_IP) { case1: ... caseN: return true }`. Works even better than binary search. Magic.
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* __Hosts switch__ – Radix trie built on `switch`. Comparable to __IPs switch__.
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Before Width: | Height: | Size: 14 KiB After Width: | Height: | Size: 14 KiB |
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@ -7,7 +7,7 @@
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"generate": "cd pac-generator && npm start",
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"prestart": "npm run generate",
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"start": "npm run bench",
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"bench": "cd Benchmark && dnx run ../pac-generator/generated-PACs",
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"bench": "cd ./pac-script-performance-analyses/benchmark && dnx run ../../pac-generator/generated-PACs",
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"test": "rm -r pac-generator/generated-PACs"
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},
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"author": "ilyaigpetrov",
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