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45 lines
1.3 KiB
Rust
45 lines
1.3 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use parse_hosts::HostsFile;
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use std::borrow::Cow;
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use std::collections::HashMap;
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use std::env;
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use std::fs::File;
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use std::io::{BufReader, Read};
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use std::net::IpAddr;
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use std::sync::Mutex;
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lazy_static! {
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static ref HOST_TABLE: Mutex<Option<HashMap<String, IpAddr>>> = Mutex::new(create_host_table());
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}
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fn create_host_table() -> Option<HashMap<String, IpAddr>> {
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let path = env::var_os("HOST_FILE")?;
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let file = File::open(&path).ok()?;
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let mut reader = BufReader::new(file);
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let mut lines = String::new();
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reader.read_to_string(&mut lines).ok()?;
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Some(parse_hostsfile(&lines))
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}
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pub fn replace_host_table(table: HashMap<String, IpAddr>) {
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*HOST_TABLE.lock().unwrap() = Some(table);
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}
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pub fn parse_hostsfile(hostsfile_content: &str) -> HashMap<String, IpAddr> {
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HostsFile::read_buffered(hostsfile_content.as_bytes())
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.pairs()
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.filter_map(Result::ok)
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.collect()
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}
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pub fn replace_host(host: &str) -> Cow<str> {
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HOST_TABLE.lock().unwrap().as_ref()
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.and_then(|table| table.get(host))
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.map_or(host.into(), |replaced_host| replaced_host.to_string().into())
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}
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