implement random url generator

Cargo.lock

@@ -17,6 +17,15 @@ version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "320119579fcad9c21884f5c4861d16174d0e06250625266f50fe6898340abefa"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "async-compression"
 version = "0.4.30"
@@ -81,6 +90,15 @@ version = "1.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d71b6127be86fdcfddb610f7182ac57211d4b18a3e9c82eb2d17662f2227ad6a"
 
+[[package]]
+name = "castaway"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dec551ab6e7578819132c713a93c022a05d60159dc86e7a7050223577484c55a"
+dependencies = [
+ "rustversion",
+]
+
 [[package]]
 name = "cc"
 version = "1.2.34"
@@ -96,6 +114,21 @@ version = "1.0.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2fd1289c04a9ea8cb22300a459a72a385d7c73d3259e2ed7dcb2af674838cfa9"
 
+[[package]]
+name = "compact_str"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3fdb1325a1cece981e8a296ab8f0f9b63ae357bd0784a9faaf548cc7b480707a"
+dependencies = [
+ "bytes",
+ "castaway",
+ "cfg-if",
+ "itoa",
+ "rustversion",
+ "ryu",
+ "static_assertions",
+]
+
 [[package]]
 name = "compression-codecs"
 version = "0.4.30"
@@ -976,6 +1009,35 @@ dependencies = [
  "bitflags",
 ]
 
+[[package]]
+name = "regex"
+version = "1.11.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23d7fd106d8c02486a8d64e778353d1cffe08ce79ac2e82f540c86d0facf6912"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6b9458fa0bfeeac22b5ca447c63aaf45f28439a709ccd244698632f9aa6394d6"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "caf4aa5b0f434c91fe5c7f1ecb6a5ece2130b02ad2a590589dda5146df959001"
+
 [[package]]
 name = "reqwest"
 version = "0.12.23"
@@ -1226,6 +1288,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
 
+[[package]]
+name = "static_assertions"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+
 [[package]]
 name = "subtle"
 version = "2.6.1"
@@ -1297,6 +1365,26 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "thiserror"
+version = "2.0.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3467d614147380f2e4e374161426ff399c91084acd2363eaf549172b3d5e60c0"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "2.0.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c5e1be1c48b9172ee610da68fd9cd2770e7a4056cb3fc98710ee6906f0c7960"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "time"
 version = "0.3.42"
@@ -1476,8 +1564,11 @@ name = "ubw-sward"
 version = "0.1.0"
 dependencies = [
  "bytes",
+ "compact_str",
  "rand",
+ "regex",
  "reqwest",
+ "thiserror",
  "tokio",
  "tower",
  "url",

Cargo.toml

@@ -22,5 +22,6 @@ rand = "0.9"
 thiserror = "2.0"
 anyhow = "1.0"
 url = "2.5"
+compact_str = { version = "0.9.0", features = ["bytes"] }
 time = "0.3"
 bytes = "1.10"

ubw-sward/Cargo.toml

@@ -9,4 +9,7 @@ tower = { workspace = true }
 reqwest = {workspace = true}
 url = {workspace = true}
 rand = {workspace = true}
+thiserror = {workspace = true}
+compact_str = {workspace = true}
 bytes = {workspace = true}
+regex = "1.11"

ubw-sward/src/http/mod.rs

@@ -0,0 +1,4 @@
+pub mod simple;
+pub mod random;
+
+pub use simple::{SimpleHttpRequest, SimpleHttpSward};

ubw-sward/src/http/random.rs

@@ -0,0 +1,107 @@
+use compact_str::CompactString;
+use rand::seq::IteratorRandom;
+use regex::Regex;
+
+#[derive(Clone)]
+pub struct RandomUrlGenerator<Rng: rand::Rng> {
+    random_engine: Rng,
+    random_parts: Box<[RegexPart]>,
+}
+
+impl<Rng: rand::Rng> RandomUrlGenerator<Rng> {
+    pub fn new(random_engine: Rng, template: &str) -> Result<Self, RandomUrlGeneratorBuildError> {
+        let re = Regex::new(r"\[([^\]]+)\](?:\{(\d+)\})?")?;
+        let mut parts: Vec<RegexPart> = Vec::new();
+        let mut last_end = 0;
+
+        for caps in re.captures_iter(template) {
+            let m = caps
+                .get(0)
+                .ok_or(RandomUrlGeneratorBuildError::SyntaxError)?;
+            if m.start() > last_end {
+                parts.push(RegexPart::Literal(template[last_end..m.start()].into()));
+            }
+            let expr = caps
+                .get(1)
+                .ok_or(RandomUrlGeneratorBuildError::SyntaxError)?
+                .as_str();
+            let count = caps
+                .get(2)
+                .map(|m| {
+                    m.as_str()
+                        .parse::<usize>()
+                        .map_err(|_| RandomUrlGeneratorBuildError::SyntaxError)
+                })
+                .transpose()?
+                .unwrap_or(1);
+            let mut chars = Vec::new();
+            let mut chars_iter = expr.chars().peekable();
+            while let Some(c) = chars_iter.next() {
+                if let Some(&dash) = chars_iter.peek()
+                    && dash == '-'
+                {
+                    chars_iter.next();
+                    if let Some(end) = chars_iter.next() {
+                        for ch in c..=end {
+                            chars.push(ch);
+                        }
+                        continue;
+                    }
+                }
+                chars.push(c);
+            }
+            let chars = chars.into_boxed_slice();
+            parts.push(RegexPart::RandomChars { chars, count });
+            last_end = m.end();
+        }
+        if last_end < template.len() {
+            parts.push(RegexPart::Literal(template[last_end..].into()));
+        }
+        Ok(Self {
+            random_engine,
+            random_parts: parts.into_boxed_slice(),
+        })
+    }
+
+    fn expected_length(&self) -> usize {
+        self.random_parts.iter().fold(0, |acc, part| match part {
+            RegexPart::Literal(s) => acc + s.len(),
+            RegexPart::RandomChars { count, .. } => acc + *count,
+        })
+    }
+
+    pub fn generate(&mut self) -> CompactString {
+        self.random_parts.iter().fold(
+            CompactString::with_capacity(self.expected_length()),
+            |mut acc, part| {
+                match &part {
+                    RegexPart::Literal(s) => {
+                        acc.push_str(s);
+                    }
+                    RegexPart::RandomChars { chars, count } => {
+                        let next = (0..*count)
+                            .filter_map(|_| chars.iter().choose(&mut self.random_engine))
+                            .collect::<CompactString>();
+                        acc.push_str(&next);
+                    }
+                };
+                acc
+            },
+        )
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum RandomUrlGeneratorBuildError {
+    #[error("Invalid regex: {0}")]
+    InvalidRegex(#[from] regex::Error),
+
+    #[error("Syntax error in template.")]
+    SyntaxError,
+}
+
+#[derive(Clone)]
+enum RegexPart {
+    Literal(CompactString),
+    RandomChars { chars: Box<[char]>, count: usize },
+}

ubw-sward/src/http/simple.rs

@@ -7,6 +7,7 @@ use tower::Service;
 use url::Url;
 
 #[derive(Clone)]
+/// A simple http sward that sends one request per call.
 pub struct SimpleHttpSward {
     client: Client,
     method: Method,

ubw-sward/src/lib.rs

@@ -1 +1,6 @@
+#![deny(clippy::unwrap_used)]
+#![deny(clippy::panic)]
+#![deny(clippy::expect_used)]
+
 pub mod http;
+pub mod utils;