rover-fetch 0.1.0

An MCP server for fetching and prepping web content for LLM agents.
Documentation 
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//! End-to-end cache lifecycle test for M2.
//!
//! Exercises the full PRD §14 acceptance criterion: repeated fetches hit
//! cache, force-refresh bypasses, expired entries re-fetch with conditional
//! headers, and `cache purge` removes entries.

use assert_cmd::Command;
use predicates::prelude::*;
use std::sync::Arc;
use std::sync::atomic::{AtomicUsize, Ordering};
use wiremock::matchers::{method, path};
use wiremock::{Mock, MockServer, Request, ResponseTemplate};

const ARTICLE_HTML: &str = r#"
<!doctype html>
<html lang="en">
<head><title>Sample article about caching behavior</title></head>
<body>
  <article>
    <h2>How to do the thing</h2>
    <meta http-equiv="Content-Language" content="en" />
    <p>Body paragraph one with enough text to clear readabilityrs's character threshold of 500 characters by default. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.</p>
  </article>
</body>
</html>
"#;

fn rover() -> Command {
    Command::cargo_bin("rover").unwrap()
}

/// Custom matcher: request *has* the given header.
struct HasHeader(&'static str);

impl wiremock::Match for HasHeader {
    fn matches(&self, request: &Request) -> bool {
        request.headers.get(self.0).is_some()
    }
}

/// Custom matcher: request does *not* have the given header.
struct MissingHeader(&'static str);

impl wiremock::Match for MissingHeader {
    fn matches(&self, request: &Request) -> bool {
        request.headers.get(self.0).is_none()
    }
}

#[tokio::test]
async fn cache_hit_then_force_refresh_and_purge() {
    let server = MockServer::start().await;
    let hits = Arc::new(AtomicUsize::new(0));
    let hits_clone = hits.clone();

    Mock::given(method("GET"))
        .and(path("/article"))
        .respond_with(move |_req: &Request| {
            hits_clone.fetch_add(1, Ordering::SeqCst);
            ResponseTemplate::new(200)
                .set_body_string(ARTICLE_HTML)
                .insert_header("content-type", "text/html; charset=utf-8")
                .insert_header("cache-control", "max-age=3600")
        })
        .mount(&server)
        .await;

    let url = format!("{}/article", server.uri());
    let tmp = tempfile::tempdir().unwrap();
    let cfg_path = tmp.path().join("rover.toml");
    std::fs::write(&cfg_path, "[ssrf]\nlevel = \"loopback\"\n").unwrap();

    // First fetch -- miss, hits the network.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args([
            "--config",
            cfg_path.to_str().unwrap(),
            "fetch",
            &url,
            "--ignore-robots",
        ])
        .assert()
        .success()
        .stdout(predicate::str::contains("How to do the thing"));
    assert_eq!(
        hits.load(Ordering::SeqCst),
        1,
        "first fetch should hit network"
    );

    // Second fetch -- hit, no network.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args([
            "--config",
            cfg_path.to_str().unwrap(),
            "fetch",
            &url,
            "--ignore-robots",
        ])
        .assert()
        .success()
        .stdout(predicate::str::contains("How to do the thing"));
    assert_eq!(
        hits.load(Ordering::SeqCst),
        1,
        "second fetch should hit cache"
    );

    // Force refresh -- bypass cache, hit network again.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args([
            "--config",
            cfg_path.to_str().unwrap(),
            "fetch",
            &url,
            "--force-refresh",
            "--ignore-robots",
        ])
        .assert()
        .success();
    assert_eq!(
        hits.load(Ordering::SeqCst),
        2,
        "force-refresh should hit network"
    );

    // Stats: 1 entry.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args(["cache", "stats"])
        .assert()
        .success()
        .stdout(predicate::str::contains("entries:       1"));

    // Purge.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args(["cache", "purge", &format!("{}/*", server.uri())])
        .assert()
        .success()
        .stdout(predicate::str::contains("purged 1 entry"));

    // Stats after purge: 0.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args(["cache", "stats"])
        .assert()
        .success()
        .stdout(predicate::str::contains("entries:       0"));
}

#[tokio::test]
async fn cli_revalidates_synchronously_on_expired_entry() {
    // The one-shot CLI has no background scheduler that can process a
    // queued `revalidate` task, so it must hit the network inline for an
    // expired entry — otherwise the row would stay at its old fetched_at
    // indefinitely and the user would see "the cache age never updates".
    //
    // Expected sequence:
    //   1. First fetch: GET /news (no If-None-Match) → 200 + populate cache
    //      with ETag and max-age=1.
    //   2. Wait > 1s so the entry expires.
    //   3. Second fetch: GET /news with If-None-Match: "abc-123" → 304
    //      Not Modified → `pages::touch` extends the freshness in place.
    //
    // Total requests to the server: 2.
    let server = MockServer::start().await;
    let etag = "\"abc-123\"";

    // 304 path for conditional GETs after the initial population.
    Mock::given(method("GET"))
        .and(path("/news"))
        .and(HasHeader("if-none-match"))
        .respond_with(
            ResponseTemplate::new(304)
                .insert_header("cache-control", "max-age=60")
                .insert_header("etag", etag),
        )
        .with_priority(1)
        .mount(&server)
        .await;

    // Initial 200 with a short max-age and an ETag.
    Mock::given(method("GET"))
        .and(path("/news"))
        .and(MissingHeader("if-none-match"))
        .respond_with(
            ResponseTemplate::new(200)
                .set_body_string(ARTICLE_HTML)
                .insert_header("content-type", "text/html; charset=utf-8")
                .insert_header("cache-control", "max-age=1")
                .insert_header("etag", etag),
        )
        .with_priority(2)
        .mount(&server)
        .await;

    let url = format!("{}/news", server.uri());
    let tmp = tempfile::tempdir().unwrap();

    // Drop the cache TTL floor below the server's max-age=1 so the entry
    // actually expires within the test.
    let cfg_path = tmp.path().join("rover.toml");
    std::fs::write(
        &cfg_path,
        "[cache]\nmin_ttl = \"1s\"\ndefault_ttl = \"1s\"\n\n[ssrf]\nlevel = \"loopback\"\n",
    )
    .unwrap();

    // First fetch -- miss + populate.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args([
            "--config",
            cfg_path.to_str().unwrap(),
            "fetch",
            &url,
            "--ignore-robots",
        ])
        .assert()
        .success()
        .stdout(predicate::str::contains("How to do the thing"));

    // Let the entry expire.
    std::thread::sleep(std::time::Duration::from_secs(2));

    // Second fetch -- expired entry; CLI revalidates synchronously and
    // gets a 304 (because the entry has a fresh ETag), so the row's
    // freshness is extended in place.
    rover()
        .env("ROVER_DATA_DIR", tmp.path())
        .args([
            "--config",
            cfg_path.to_str().unwrap(),
            "fetch",
            &url,
            "--ignore-robots",
        ])
        .assert()
        .success()
        .stdout(predicate::str::contains("How to do the thing"));

    let received = server
        .received_requests()
        .await
        .expect("request recording is enabled by default");
    assert_eq!(
        received.len(),
        2,
        "expected 2 requests: the initial 200 + a conditional GET on expiry",
    );
    assert!(
        received[0].headers.get("if-none-match").is_none(),
        "first request should not include If-None-Match"
    );
    assert_eq!(
        received[1]
            .headers
            .get("if-none-match")
            .and_then(|v| v.to_str().ok()),
        Some(etag),
        "second request should be conditional on the stored ETag"
    );
}