mirror of
https://github.com/anticensority/runet-censorship-bypass.git
synced 2024-11-28 04:13:43 +03:00
26 lines
1.1 KiB
Markdown
26 lines
1.1 KiB
Markdown
|
## PAC-Script Performance Analysis
|
|||
|
|
|
|||
|
|
Somewhere in PAC-script you may want:
|
|||
|
|
|
|||
|
|
```javascript
|
|||
|
|
if (Is_subdomain_of( host, blocked_hosts ))
|
|||
|
|
return 'use proxy';
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
You have to make `Is_subdomain_of` very fast.
|
|||
|
|
This check is executed on each request. You should watch memeory consumption too.
|
|||
|
|
|
|||
|
|
The naive solution is to keep array of blocked ips and check if the host resolves to one of the ips.
|
|||
|
|
You may do it with `indexOf`, binary search, etc.
|
|||
|
|
The shortcoming of every ip solution is that __some providers resolve blocked hosts to wrong ips__, so we eventually need list of hosts.
|
|||
|
|
|
|||
|
|
I have tested different solutions, and depicted [results](./benchmark/Output.txt) in the following chart:
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
* __IPs indexOf__ <20> Blocked IP is searched by `indexOf`
|
|||
|
|
* __IPs binary__ <20> Blocked IP is searched by binary search. For some reason miss time slightly increased.
|
|||
|
|
* __IPs switch__ <20> Simply `switch(Blocked_IP) { case1: ... caseN: return true }`. Works even better than binary search. Magic.
|
|||
|
|
* __Hosts switch__ <20> Radix trie built on `switch`. Comparable to __IPs switch__.
|
|||
|
|
|