add: rewriter logic and tests
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/target
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Cargo.lock
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Cargo.lock
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||||
[[package]]
|
||||
name = "tempdir"
|
||||
version = "0.3.7"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
|
||||
dependencies = [
|
||||
"rand",
|
||||
"remove_dir_all",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "unicase"
|
||||
version = "2.8.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "75b844d17643ee918803943289730bec8aac480150456169e647ed0b576ba539"
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.18"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5a5f39404a5da50712a4c1eecf25e90dd62b613502b7e925fd4e4d19b5c96512"
|
||||
|
||||
[[package]]
|
||||
name = "utf8parse"
|
||||
version = "0.2.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
|
||||
|
||||
[[package]]
|
||||
name = "walkdir"
|
||||
version = "2.5.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "29790946404f91d9c5d06f9874efddea1dc06c5efe94541a7d6863108e3a5e4b"
|
||||
dependencies = [
|
||||
"same-file",
|
||||
"winapi-util",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-util"
|
||||
version = "0.1.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
|
||||
dependencies = [
|
||||
"windows-sys",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.59.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
|
||||
dependencies = [
|
||||
"windows-targets",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows-targets"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
|
||||
dependencies = [
|
||||
"windows_aarch64_gnullvm",
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_gnullvm",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_gnullvm",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnullvm"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.52.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
|
||||
13
Cargo.toml
Normal file
13
Cargo.toml
Normal file
@@ -0,0 +1,13 @@
|
||||
[package]
|
||||
name = "skubelb"
|
||||
version = "0.1.0"
|
||||
edition = "2024"
|
||||
|
||||
[dependencies]
|
||||
anyhow = "1.0.97"
|
||||
clap = { version = "4.5.34", features = ["derive"] }
|
||||
dir-diff = "0.3.3"
|
||||
env_logger = "0.11.7"
|
||||
include_directory = "0.1.1"
|
||||
log = "0.4.27"
|
||||
tempdir = "0.3.7"
|
||||
19
README.md
19
README.md
@@ -0,0 +1,19 @@
|
||||
# A simple Kubernetes load balancer
|
||||
|
||||
Configures nginx to forward connections to your node IPs.
|
||||
Services should be declared as NodePort, which means that they
|
||||
open a port on all nodes. When the request lands on any node,
|
||||
it is forwarded to the correct pod via the network mesh kubernetes
|
||||
is using. In theory, there is one a hop penalty.
|
||||
|
||||
But lets be honest. You're running with a single LB, probably a GCE free
|
||||
tier N1 VM. That extra hop doesn't matter.
|
||||
|
||||
## Config
|
||||
|
||||
Configure nginx to do what you want, test it. Use any Node IP for your testing.
|
||||
This tool accepts an argument (rewrite_string) which will be replaced using these rules:
|
||||
|
||||
1. For each line that contains rewrite string:
|
||||
2. Copy the line once per node IP, replacing the string with host IPs
|
||||
|
||||
|
||||
51
src/main.rs
Normal file
51
src/main.rs
Normal file
@@ -0,0 +1,51 @@
|
||||
use clap::Parser;
|
||||
|
||||
mod rewriter;
|
||||
|
||||
use env_logger::Env;
|
||||
use log::info;
|
||||
use rewriter::Rewriter;
|
||||
|
||||
/// Implements a HTTP server which allows clients to 'register'
|
||||
/// themselves. Their IP address will be used to replace a
|
||||
/// needle in a set of config files. This is intended to be
|
||||
/// used as a low-cost way of enabling Kubernetes ingress
|
||||
/// using nginx running on a machine that has a public port.
|
||||
///
|
||||
/// The needle is expected to be a dummy IP address; something
|
||||
/// fairly unique. The goal is to replace nginx files, where
|
||||
/// we often repeat lines if we want nginx to load balance between
|
||||
/// multiple destination IPs.
|
||||
#[derive(Parser, Debug)]
|
||||
#[command(version, about, long_about = None)]
|
||||
struct Args {
|
||||
/// The needle that will be replaced. Anytime a line
|
||||
/// is encountered with this needle, the line is dropped
|
||||
/// and instead N lines (one per replacement) is added to
|
||||
/// the output.
|
||||
#[arg(short, long)]
|
||||
rewrite_string: String,
|
||||
|
||||
/// The folder which contains the templates that
|
||||
/// will be be searched for the needle.
|
||||
#[arg(short, long)]
|
||||
source_folder: String,
|
||||
|
||||
/// Where to write the replaced lines.
|
||||
#[arg(short, long)]
|
||||
dest_folder: String,
|
||||
}
|
||||
|
||||
fn main() {
|
||||
// Log info and above by default
|
||||
env_logger::Builder::from_env(Env::default().default_filter_or("info")).init();
|
||||
let args = Args::parse();
|
||||
|
||||
let mut rewriter = Rewriter::new(args.rewrite_string);
|
||||
|
||||
rewriter.add_replacement(String::from("abc"));
|
||||
rewriter
|
||||
.rewrite_folder(&args.source_folder, &args.dest_folder)
|
||||
.unwrap();
|
||||
info!("Finished writing new config to {}", args.dest_folder);
|
||||
}
|
||||
117
src/rewriter.rs
Normal file
117
src/rewriter.rs
Normal file
@@ -0,0 +1,117 @@
|
||||
use anyhow::Result;
|
||||
use std::collections::HashSet;
|
||||
use std::path::Path;
|
||||
use std::{
|
||||
fs::{self, File},
|
||||
io::{BufReader, prelude::*},
|
||||
};
|
||||
|
||||
pub struct Rewriter {
|
||||
source: String,
|
||||
replacements: HashSet<String>,
|
||||
}
|
||||
|
||||
impl Rewriter {
|
||||
pub fn new(source: String) -> Self {
|
||||
Self {
|
||||
source,
|
||||
replacements: HashSet::new(),
|
||||
}
|
||||
}
|
||||
|
||||
pub fn add_replacement(&mut self, replacement: String) {
|
||||
self.replacements.insert(replacement);
|
||||
}
|
||||
|
||||
pub fn remove_replacement(&mut self, replacement: &str) {
|
||||
self.replacements.remove(replacement);
|
||||
}
|
||||
|
||||
pub fn rewrite_folder(&self, src: &str, dst: &str) -> Result<()> {
|
||||
// Make sure we are deterministic; construct a list of strings and sort
|
||||
// them
|
||||
let mut replacements: Vec<String> = self.replacements.iter().map(|s| s.clone()).collect();
|
||||
replacements.sort();
|
||||
let dst_base = Path::new(dst);
|
||||
let mut to_visit = vec![String::from(src)];
|
||||
while to_visit.len() > 0 {
|
||||
let dir = to_visit.pop().unwrap();
|
||||
for entry in fs::read_dir(&dir)? {
|
||||
let entry = entry?;
|
||||
let metadata = entry.metadata()?;
|
||||
|
||||
// We need to find the destination this should be written into
|
||||
// First, calculate the 'relative' path after we trim the
|
||||
// the src prefix, then join that with the dst prefix
|
||||
let src_path = entry.path();
|
||||
let src_part_path = src_path.strip_prefix(&src)?;
|
||||
let dst_path = dst_base.join(src_part_path);
|
||||
|
||||
if metadata.is_dir() {
|
||||
// Create the directory, then carry on. Note that we explore the
|
||||
// src_path after creating dst_path.
|
||||
fs::create_dir(&dst_path)?;
|
||||
to_visit.push(src_path.into_os_string().into_string().unwrap());
|
||||
continue;
|
||||
}
|
||||
|
||||
// Open 2 files; one to read and translate, and one to write.
|
||||
let source_file = File::open(&src_path)?;
|
||||
let mut dest_file = File::create(&dst_path)?;
|
||||
let reader = BufReader::new(source_file);
|
||||
|
||||
for line in reader.lines() {
|
||||
let line = line?;
|
||||
// If the line is not subject to replacement, copy it and
|
||||
// carry on.
|
||||
if !line.contains(&self.source) {
|
||||
writeln!(dest_file, "{}", line)?;
|
||||
continue;
|
||||
}
|
||||
|
||||
// Else, repeat the line multiple times, replacing the string
|
||||
// in question
|
||||
for replacement in &replacements {
|
||||
let new_line = line.replace(&self.source, &replacement);
|
||||
writeln!(dest_file, "{}", new_line)?;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use include_directory::{Dir, include_directory};
|
||||
use tempdir::TempDir;
|
||||
|
||||
use super::Rewriter;
|
||||
|
||||
static TEST_FILES: Dir<'_> = include_directory!("$CARGO_MANIFEST_DIR/src/testdata");
|
||||
#[test]
|
||||
fn basic_test() {
|
||||
let testdata = TempDir::new("").unwrap();
|
||||
TEST_FILES.extract(testdata.path()).unwrap();
|
||||
let src = testdata.path().join("testsrc");
|
||||
let dst = TempDir::new("").unwrap();
|
||||
|
||||
let mut rewriter = Rewriter::new("to_be_replaced".into());
|
||||
rewriter.add_replacement("abc".into());
|
||||
rewriter.add_replacement("def".into());
|
||||
rewriter.add_replacement("zyx".into());
|
||||
rewriter.remove_replacement("zyx");
|
||||
rewriter
|
||||
.rewrite_folder(
|
||||
src.as_os_str().to_str().unwrap(),
|
||||
dst.path().as_os_str().to_str().unwrap(),
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
// Validate that everything matches
|
||||
assert!(
|
||||
dir_diff::is_different(testdata.path().join("testdst"), dst.path()).unwrap() == false
|
||||
);
|
||||
}
|
||||
}
|
||||
5
src/testdata/testdst/hello.txt
vendored
Normal file
5
src/testdata/testdst/hello.txt
vendored
Normal file
@@ -0,0 +1,5 @@
|
||||
This is a line
|
||||
This is abc line
|
||||
This is def line
|
||||
|
||||
This is another line
|
||||
4
src/testdata/testdst/recursive/world.txt
vendored
Normal file
4
src/testdata/testdst/recursive/world.txt
vendored
Normal file
@@ -0,0 +1,4 @@
|
||||
This is a abc line.
|
||||
This is a def line.
|
||||
|
||||
In a nested directory.
|
||||
4
src/testdata/testsrc/hello.txt
vendored
Normal file
4
src/testdata/testsrc/hello.txt
vendored
Normal file
@@ -0,0 +1,4 @@
|
||||
This is a line
|
||||
This is to_be_replaced line
|
||||
|
||||
This is another line
|
||||
3
src/testdata/testsrc/recursive/world.txt
vendored
Normal file
3
src/testdata/testsrc/recursive/world.txt
vendored
Normal file
@@ -0,0 +1,3 @@
|
||||
This is a to_be_replaced line.
|
||||
|
||||
In a nested directory.
|
||||
Reference in New Issue
Block a user