feat: Add refresh config to prevent hammering servers

Adds CI configuration that builds the Rust package, and exports the package back
to Github after submits to canon.

Change-Id: I2f8dcff2a614898c55115f44510543ff25d46b55
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12996
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: thk <thomas@koch.ro>

.gitignore

@@ -1,2 +1,4 @@
 /target
 /mars.toml
+/out
+/feeds

Cargo.lock

@@ -128,9 +128,9 @@ checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
 [[package]]
 name = "bitflags"
-version = "2.6.0"
+version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
+checksum = "1be3f42a67d6d345ecd59f675f3f012d6974981560836e938c22b424b85ce1be"
 dependencies = [
  "serde",
 ]
@@ -183,10 +183,19 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "325918d6fe32f23b19878fe4b34794ae41fc19ddbe53b10571a4874d44ffd39b"
 
 [[package]]
-name = "cc"
-version = "1.2.7"
+name = "camino"
+version = "1.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a012a0df96dd6d06ba9a1b29d6402d1a5d77c6befd2566afdc26e10603dc93d7"
+checksum = "8b96ec4966b5813e2c0507c1f86115c8c5abaadc3980879c3424042a02fd1ad3"
+dependencies = [
+ "serde",
+]
+
+[[package]]
+name = "cc"
+version = "1.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8293772165d9345bdaaa39b45b2109591e63fe5e6fbc23c6ff930a048aa310b"
 dependencies = [
  "shlex",
 ]
@@ -199,9 +208,9 @@ checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
 [[package]]
 name = "chrono"
-version = "0.4.39"
+version = "0.4.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7e36cc9d416881d2e24f9a963be5fb1cd90966419ac844274161d10488b3e825"
+checksum = "1a7964611d71df112cb1730f2ee67324fcf4d0fc6606acbbe9bfe06df124637c"
 dependencies = [
  "android-tzdata",
  "iana-time-zone",
@@ -209,7 +218,7 @@ dependencies = [
  "num-traits",
  "serde",
  "wasm-bindgen",
- "windows-targets",
+ "windows-link",
 ]
 
 [[package]]
@@ -236,9 +245,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.25"
+version = "4.5.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b95dca1b68188a08ca6af9d96a6576150f598824bdb528c1190460c2940a0b48"
+checksum = "a8eb5e908ef3a6efbe1ed62520fb7287959888c88485abe072543190ecc66783"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -246,9 +255,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.25"
+version = "4.5.26"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9ab52925392148efd3f7562f2136a81ffb778076bcc85727c6e020d6dd57cf15"
+checksum = "96b01801b5fc6a0a232407abc821660c9c6d25a1cafc0d4f85f29fb8d9afc121"
 dependencies = [
  "anstream",
  "anstyle",
@@ -1106,14 +1115,15 @@ checksum = "953ec861398dccce10c670dfeaf3ec4911ca479e9c02154b3a215178c5f566f2"
 
 [[package]]
 name = "planet-mars"
-version = "0.1.0"
+version = "0.1.1"
 dependencies = [
  "anyhow",
+ "camino",
+ "chrono",
  "clap",
  "env_logger",
  "feed-rs",
  "log",
- "quick-xml",
  "ron",
  "serde",
  "slug",
@@ -1140,9 +1150,9 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.92"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "37d3544b3f2748c54e147655edb5025752e2303145b5aefb3c3ea2c78b973bb0"
+checksum = "60946a68e5f9d28b0dc1c21bb8a97ee7d018a8b322fa57838ba31cc878e22d99"
 dependencies = [
  "unicode-ident",
 ]
@@ -1155,7 +1165,6 @@ checksum = "165859e9e55f79d67b96c5d96f4e88b6f2695a1972849c15a6a3f5c59fc2c003"
 dependencies = [
  "encoding_rs",
  "memchr",
- "serde",
 ]
 
 [[package]]
@@ -1268,9 +1277,9 @@ dependencies = [
 
 [[package]]
 name = "rustls"
-version = "0.23.20"
+version = "0.23.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5065c3f250cbd332cd894be57c40fa52387247659b14a2d6041d121547903b1b"
+checksum = "8f287924602bf649d949c63dc8ac8b235fa5387d394020705b80c4eb597ce5b8"
 dependencies = [
  "log",
  "once_cell",
@@ -1460,9 +1469,9 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 
 [[package]]
 name = "syn"
-version = "2.0.95"
+version = "2.0.96"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46f71c0377baf4ef1cc3e3402ded576dccc315800fbc62dfc7fe04b009773b4a"
+checksum = "d5d0adab1ae378d7f53bdebc67a39f1f151407ef230f0ce2883572f5d8985c80"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1518,18 +1527,18 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "2.0.10"
+version = "2.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a3ac7f54ca534db81081ef1c1e7f6ea8a3ef428d2fc069097c079443d24124d3"
+checksum = "d452f284b73e6d76dd36758a0c8684b1d5be31f92b89d07fd5822175732206fc"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "2.0.10"
+version = "2.0.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9e9465d30713b56a37ede7185763c3492a91be2f5fa68d958c44e41ab9248beb"
+checksum = "26afc1baea8a989337eeb52b6e72a039780ce45c3edfcc9c5b9d112feeb173c2"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1889,6 +1898,12 @@ dependencies = [
  "windows-targets",
 ]
 
+[[package]]
+name = "windows-link"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76840935b766e1b0a05c0066835fb9ec80071d4c09a16f6bd5f7e655e3c14c38"
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"
@@ -1973,9 +1988,9 @@ checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
 
 [[package]]
 name = "winnow"
-version = "0.6.22"
+version = "0.6.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "39281189af81c07ec09db316b302a3e67bf9bd7cbf6c820b50e35fee9c2fa980"
+checksum = "c8d71a593cc5c42ad7876e2c1fda56f314f3754c084128833e64f1345ff8a03a"
 dependencies = [
  "memchr",
 ]

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "planet-mars"
-version = "0.1.0"
+version = "0.1.1"
 edition = "2021"
 authors = ["Thomas Koch <thomas@koch.ro>"]
 description = "Feed aggregation planet like Planet Venus, produces static HTML and ATOM feed from fetched feeds."
@@ -10,16 +10,18 @@ keywords = ["atom", "rss", "planet", "feed", "blogging"]
 categories = ["web-programming"]
 
 [dependencies]
-anyhow = "*"
-clap = { version = "*", features = ["derive"] }
-env_logger = "*"
-feed-rs = "*"
-log = "*"
-ron = "*" # todo for development, to check atom-rs internal representation of feeds
-serde = { version = "*", features = ["derive"] }
-slug = "*"
-tera = "*"
-toml = "*"
+anyhow = "1"
+camino = { version = "1.1.9", features = ["serde", "serde1"] }
+chrono = { version = "0.4.40", features = ["now", "serde"] }
+clap = { version = "4", features = ["derive"] }
+env_logger = "0"
+feed-rs = "2"
+log = "0"
+ron = "0"
+serde = { version = "1", features = ["derive"] }
+slug = "0"
+tera = "1"
+toml = "0"
 ureq = { version = "3.0.0-rc5", features = ["brotli", "charset", "gzip", "native-tls"]}
-url = "*"
-quick-xml = { version = "*", features = ["serialize"] }
+url = "2"
+

OWNERS

@@ -0,0 +1 @@
+thk

README.md

@@ -1,13 +1,24 @@
-Simple planet like planet venus but in rust and maintained.
+Simple successor to Planet Venus but in Rust and maintained.
 
 Please see the rustdoc of main.rs for further information.
 
-## todo
+## Todo
 
-* use a nice lib to process the config file
+* find and use a nice lib to process the config file
   * should check whether dirs exists and are writeable
   * should check whether feed urls can be parsed
 
+## Planet Venus
+
+Planet Venus is used by many planets on the internet. However its code has not
+been maintained since ~2011 and it uses Python 2.
+
+Planet Mars should be a lightweight successor to Planet Venus.
+
+Still the Planet Venus documentation contains some useful information on
+[Etiquette](https://intertwingly.net/code/venus/docs/etiquette.html) for
+Planet hosters.
+
 ## Credits
 
 While writing this, I read and also copied code from:

default.nix

@@ -0,0 +1,17 @@
+{ depot, pkgs, ... }:
+
+pkgs.rustPlatform.buildRustPackage {
+  name = "planet-mars";
+  src = depot.third_party.gitignoreSource ./.;
+  cargoLock.lockFile = ./Cargo.lock;
+
+  nativeBuildInputs = [ pkgs.pkg-config ];
+  buildInputs = [ pkgs.openssl ];
+
+  # planet-mars is mirrored to Github.
+  passthru.meta.ci.extraSteps.github = depot.tools.releases.filteredGitPush {
+    filter = ":/web/planet-mars";
+    remote = "git@github.com:thkoch2001/planet-mars.git";
+    ref = "refs/heads/master";
+  };
+}

mars.toml.example

@@ -3,6 +3,7 @@ feed_dir = "/var/lib/planet-mars/feeds"
 from = "thomas@koch.ro"
 out_dir = "/var/lib/planet-mars/out"
 templates_dir = "/var/lib/planet-mars/templates"
+max_entries = 50
 
 [[feeds]]
 url = "https://blog.fefe.de/rss.xml"

src/feed_store.rs

@@ -1,85 +1,214 @@
-use anyhow::bail;
 use anyhow::Result;
+use camino::{Utf8Path, Utf8PathBuf};
+use chrono::{DateTime, Duration, Utc};
 use feed_rs::model::Entry;
 use feed_rs::model::Feed;
 use ron::ser::{to_string_pretty, PrettyConfig};
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
+use std::collections::{BTreeMap, HashMap};
 use std::convert::AsRef;
 use std::fs;
-use std::io::BufReader;
-use std::path::PathBuf;
+use std::time::Instant;
 use ureq::http::HeaderMap;
 use ureq::http::Response;
 use ureq::Body;
 use url::Url;
 
-#[derive(Deserialize, Serialize, Default)]
-pub struct FetchData {
-    pub etag: String,
-    pub last_modified: String,
-}
-
-pub struct FeedStore {
-    pub dir: PathBuf,
-}
-
-impl FeedStore {
-    pub fn new(dir: &str) -> Self {
-        Self {
-            dir: super::to_checked_pathbuf(dir),
-        }
-    }
-
-    fn slugify_url(url: &Url) -> Result<String> {
-        let Some(domain) = url.domain() else {
-            bail!("Url has no domain: '{url}'.")
-        };
+pub fn slugify_url(url: &Url) -> String {
+    let domain = url.domain().unwrap();
     let query = url.query().unwrap_or("");
-        Ok(slug::slugify(format!("{domain}{}{query}", url.path())))
+    slug::slugify(format!("{domain}{}{query}", url.path()))
 }
 
-    fn generic_path(&self, url: &Url, ext: &str) -> Result<String> {
-        Ok(format!(
-            "{}/{}{ext}",
-            self.dir.display(),
-            Self::slugify_url(url)?
-        ))
+/// Stored settings/info about a feed.
+#[derive(Debug, Deserialize, Serialize)]
+pub struct FeedStoreFeedInfo {
+    /// First time we added this feed.
+    ///
+    /// Used for historical purposes only.
+    pub added: DateTime<Utc>,
+    /// Last known cached entry, if any.
+    ///
+    /// Used to let the server know whether we need a new entry or not.
+    pub fetch_data: Option<FetchData>,
 }
 
-    fn feed_path(&self, url: &Url) -> Result<String> {
-        self.generic_path(url, "")
+impl FeedStoreFeedInfo {
+    pub fn new() -> Self {
+        Self {
+            added: Utc::now(),
+            fetch_data: None,
+        }
+    }
 }
 
-    fn fetchdata_path(&self, url: &Url) -> Result<String> {
-        self.generic_path(url, ".toml")
+/// Storage for a single feed.
+///
+/// Contains one [FeedStoreVersion] for every time the feed has been successfully fetched,
+/// and one [FeedStoreEntry] for each article referenced throughout the entries.
+#[derive(Debug, Deserialize, Serialize)]
+pub struct FeedStoreFeed {
+    /// The feed URL
+    pub url: Url,
+    /// Where it's stored, should be inside the [FeedStore::dir].
+    pub dir: Utf8PathBuf,
+    /// Raw feed path
+    pub path_feed: Utf8PathBuf,
+    /// Raw feed RON path
+    pub path_feed_ron: Utf8PathBuf,
+    /// Settings path
+    pub path_settings: Utf8PathBuf,
+    /// Detailed settings/info about a feed.
+    pub info: FeedStoreFeedInfo,
+    /// Stored copy of the raw XML feed (if any)
+    pub raw_feed: Option<String>,
 }
 
-    pub fn load_fetchdata(&self, url: &Url) -> Result<FetchData> {
-        let path = self.fetchdata_path(url)?;
-        if !fs::exists(path.clone())? {
-            return Ok(FetchData::default());
-        }
-        Ok(toml::from_str(&fs::read_to_string(path)?)?)
+impl FeedStoreFeed {
+    pub fn new(basedir: &Utf8Path, url: &Url) -> Self {
+        let dir = basedir.join(slugify_url(url));
+        if !dir.is_dir() {
+            std::fs::create_dir_all(&dir).unwrap();
         }
 
-    fn has_changed(&self, url: &Url, new_feed: &Feed) -> Result<bool> {
-        let Some(old_feed) = self.load_feed(url, false)? else {
-            return Ok(true);
+        let path_settings = dir.join("settings.toml");
+        let info: FeedStoreFeedInfo = match std::fs::read_to_string(&path_settings) {
+            Ok(s) => toml::from_str(&s).unwrap(),
+            Err(_e) => {
+                // Assume file has not been created yet. Initialize
+                let info = FeedStoreFeedInfo::new();
+                std::fs::write(&path_settings, toml::to_string(&info).unwrap()).unwrap();
+                info
+            }
+        };
+
+        let raw_feed: Option<String> = std::fs::read_to_string(dir.join("feed.xml")).ok();
+
+        Self {
+            dir: dir.clone(),
+            path_feed: dir.join("feed.xml"),
+            path_feed_ron: dir.join("feed.ron"),
+            path_settings: dir.join("settings.toml"),
+            url: url.clone(),
+            info,
+            raw_feed,
+        }
+    }
+
+    pub fn load_fetchdata(&self) -> Option<&FetchData> {
+        self.info.fetch_data.as_ref()
+    }
+
+    pub fn load_feed(&self, sanitize: bool) -> Option<Feed> {
+        if let Some(raw_feed) = &self.raw_feed {
+            let parser = feed_rs::parser::Builder::new()
+                .sanitize_content(sanitize)
+                .build();
+            Some(parser.parse(raw_feed.as_bytes()).unwrap())
+        } else {
+            None
+        }
+    }
+
+    pub fn has_changed(&self, new_feed: &Feed) -> bool {
+        let Some(old_feed) = self.load_feed(false) else {
+            return true;
         };
 
         let mut old_iter = old_feed.entries.iter();
         for new in &new_feed.entries {
             let Some(old) = old_iter.next() else {
-                return Ok(true);
+                return true;
             };
             if old != new {
-                return Ok(true);
+                return true;
             }
         }
         // ignoring any entries left in old_iter
+        false
+    }
+
+    pub fn store(&mut self, mut response: Response<Body>) -> Result<bool> {
+        let headers = response.headers();
+        let fetchdata = FetchData {
+            etag: hv(headers, "etag"),
+            last_modified: hv(headers, "last_modified"),
+            when: Utc::now(),
+        };
+
+        let body = response.body_mut().with_config().read_to_vec()?;
+        let feed = match feed_rs::parser::parse(body.as_slice()) {
+            Ok(f) => f,
+            Err(e) => {
+                warn!("Error when parsing feed for {}: {e:?}", self.url);
+                return Ok(false);
+            }
+        };
+
+        debug!("Storing fetchdata for {}", self.url);
+        self.info.fetch_data = Some(fetchdata);
+        Self::write(&self.path_settings, toml::to_string(&self.info)?)?;
+
+        if !self.has_changed(&feed) {
+            return Ok(false);
+        }
+        debug!("Storing feed for {}.", self.url);
+        // todo don't serialize to string but to writer
+        Self::write(
+            &self.path_feed_ron,
+            to_string_pretty(&feed, PrettyConfig::default())?,
+        )?;
+        Self::write(&self.path_feed, body)?;
+        Ok(true)
+    }
+
+    /// refresh in hours
+    pub fn fetch(&mut self, fetcher: &super::Fetcher, refresh: usize) -> Result<bool> {
+        let mut builder = fetcher
+            .agent
+            .get(self.url.to_string())
+            .header("FROM", fetcher.from.clone());
+
+        if let Some(fetchdata) = self.load_fetchdata() {
+            if !fetchdata.etag.is_empty() {
+                builder = builder.header("If-None-Match", fetchdata.etag.clone());
+            }
+            if !fetchdata.last_modified.is_empty() {
+                builder = builder.header("If-Modified-Since", fetchdata.last_modified.clone());
+            }
+
+            // Check if we have hit time for refresh
+            if fetchdata.when + Duration::try_hours(refresh as i64).unwrap() >= Utc::now() {
+                // No need to rebuild, check again later
+                return Ok(false);
+            }
+        }
+
+        let start_instant = Instant::now();
+        let result = builder.call();
+        let duration = start_instant.elapsed();
+
+        let response = result?;
+        debug!(
+            "fetched with status {} in {} ms: {}",
+            response.status(),
+            duration.as_millis(),
+            self.url,
+        );
+        let status = response.status();
+        match status.as_u16() {
+            304 => Ok(false), // Not Modified -> nothing to do
+            200 => self.store(response),
+            _ => {
+                warn!(
+                    "HTTP Status {} not implemented for {}",
+                    response.status(),
+                    self.url,
+                );
                 Ok(false)
             }
+        }
+    }
 
     fn write<P: AsRef<std::path::Path> + std::fmt::Display, C: AsRef<[u8]>>(
         path: P,
@@ -90,85 +219,66 @@ impl FeedStore {
         }
         fs::write(path, contents)
     }
-
-    pub fn store(&self, url: &Url, mut response: Response<Body>) -> Result<bool> {
-        let headers = response.headers();
-        let fetchdata = FetchData {
-            etag: hv(headers, "etag"),
-            last_modified: hv(headers, "last_modified"),
-        };
-
-        let body = response.body_mut().with_config().read_to_vec()?;
-        let feed = match feed_rs::parser::parse(body.as_slice()) {
-            Ok(f) => f,
-            Err(e) => {
-                warn!("Error when parsing feed for {url}: {e:?}");
-                return Ok(false);
-            }
-        };
-        if !self.has_changed(url, &feed)? {
-            return Ok(false);
-        }
-        debug!("Storing feed for {url}.");
-        // todo don't serialize to string but to writer
-        Self::write(
-            self.generic_path(url, ".ron")?,
-            to_string_pretty(&feed, PrettyConfig::default())?,
-        )?;
-        Self::write(self.feed_path(url)?, body)?;
-        Self::write(self.fetchdata_path(url)?, toml::to_string(&fetchdata)?)?;
-        Ok(true)
 }
 
-    fn load_feed(&self, url: &Url, sanitize: bool) -> Result<Option<Feed>> {
-        let parser = feed_rs::parser::Builder::new()
-            .sanitize_content(sanitize)
-            .build();
-
-        let path = self.feed_path(url)?;
-        if !fs::exists(path.clone())? {
-            return Ok(None);
-        }
-        let file = fs::File::open(path)?;
-        Ok(Some(parser.parse(BufReader::new(file))?))
+#[derive(Clone, Debug, Deserialize, Serialize, Default)]
+pub struct FetchData {
+    pub when: DateTime<Utc>,
+    pub etag: String,
+    pub last_modified: String,
 }
 
-    pub fn collect(
-        &self,
-        feed_configs: &Vec<super::FeedConfig>,
-        max_entries: usize,
-    ) -> (HashMap<String, Feed>, Vec<Entry>) {
+#[derive(Debug)]
+pub struct FeedStore {
+    pub _dir: Utf8PathBuf,
+    pub feeds: BTreeMap<Url, FeedStoreFeed>,
+}
+
+impl FeedStore {
+    pub fn new(dir: &str, feedlist: &Vec<super::FeedConfig>) -> Self {
+        let dir = super::to_checked_pathbuf(dir);
+        let mut feeds: BTreeMap<Url, FeedStoreFeed> = BTreeMap::new();
+
+        for feed_config in feedlist {
+            let feed_url = Url::parse(&feed_config.url).unwrap();
+            feeds.insert(feed_url.clone(), FeedStoreFeed::new(&dir, &feed_url));
+        }
+
+        Self { _dir: dir, feeds }
+    }
+
+    pub fn collect(&mut self, max_entries: usize) -> (HashMap<String, Feed>, Vec<Entry>) {
         let mut feeds = HashMap::new();
         let mut entries = Vec::new();
 
-        for feed_config in feed_configs {
-            let mut feed = match (|| {
-                let url = Url::parse(&feed_config.url)?;
-                self.load_feed(&url, true)
-            })() {
-                Err(e) => {
-                    warn!(
-                        "Problem parsing feed file for feed {}: {e:?}",
-                        feed_config.url
-                    );
+        for (feed_url, feed_store_feed) in self.feeds.iter_mut() {
+            let Some(mut feed) = feed_store_feed.load_feed(true) else {
+                warn!("Problem parsing feed file for feed {}", feed_url);
                 continue;
-                }
-                Ok(None) => continue,
-                Ok(Some(f)) => f,
             };
+
             for entry in &mut feed.entries {
-                entry.source = Some(feed_config.url.clone());
+                entry.source = Some(feed_url.to_string());
             }
 
             entries.append(&mut std::mem::take(&mut feed.entries));
-            feeds.insert(feed_config.url.clone(), feed);
-            // optimization to reduce memory usage
             if entries.len() > 4 * max_entries {
                 entries = trim_entries(entries, max_entries);
             }
+
+            feeds.insert(feed_url.to_string(), feed.clone());
         }
         (feeds, trim_entries(entries, max_entries))
     }
+
+    pub fn fetch(&mut self, fetcher: &super::Fetcher, refresh: usize) -> Result<bool> {
+        let mut rebuild = false;
+        for (_url, feed) in self.feeds.iter_mut() {
+            rebuild |= feed.fetch(fetcher, refresh)?;
+        }
+
+        Ok(rebuild)
+    }
 }
 
 fn trim_entries(mut entries: Vec<Entry>, max_entries: usize) -> Vec<Entry> {

src/fetcher.rs

@@ -1,15 +1,10 @@
-use anyhow::Result;
-use std::time::Instant;
 use ureq::tls::{TlsConfig, TlsProvider};
 use ureq::Agent;
-use url::Url;
-
-use crate::FeedStore;
 
 pub struct Fetcher {
-    agent: Agent,
+    pub agent: Agent,
     /// FROM header for requests
-    from: String,
+    pub from: String,
 }
 
 impl Fetcher {
@@ -36,41 +31,4 @@ impl Fetcher {
             from: from.to_string(),
         }
     }
-
-    pub fn fetch(&self, url: Url, feed_store: &FeedStore) -> Result<bool> {
-        let fetchdata = feed_store.load_fetchdata(&url)?;
-        let mut builder = self
-            .agent
-            .get(url.to_string())
-            .header("FROM", self.from.clone());
-        if !fetchdata.etag.is_empty() {
-            builder = builder.header("If-None-Match", fetchdata.etag);
-        }
-        if !fetchdata.last_modified.is_empty() {
-            builder = builder.header("If-Modified-Since", fetchdata.last_modified);
-        }
-
-        let start_instant = Instant::now();
-        let result = builder.call();
-        let duration = start_instant.elapsed();
-
-        let response = result?;
-        debug!(
-            "fetched with status {} in {} ms: {url}",
-            response.status(),
-            duration.as_millis()
-        );
-        let status = response.status();
-        match status.as_u16() {
-            304 => Ok(false), // Not Modified -> nothing to do
-            200 => feed_store.store(&url, response),
-            _ => {
-                warn!(
-                    "HTTP Status {} not implemented for {url}",
-                    response.status()
-                );
-                Ok(false)
-            }
-        }
-    }
 }

src/main.rs

@@ -26,11 +26,10 @@ extern crate log;
 use crate::feed_store::FeedStore;
 use crate::fetcher::Fetcher;
 use anyhow::Result;
+use camino::Utf8PathBuf;
 use clap::Parser;
 use serde::Deserialize;
 use std::fs;
-use std::path::PathBuf;
-use url::Url;
 
 //mod atom_serializer;
 mod feed_store;
@@ -68,15 +67,17 @@ struct Config {
     templates_dir: String,
     /// How many feed entries should be included in the planet
     max_entries: usize,
+    /// How soon to refresh, in hours
+    refresh: usize,
 }
 
-pub fn to_checked_pathbuf(dir: &str) -> PathBuf {
-    let dir: PathBuf = PathBuf::from(dir);
+pub fn to_checked_pathbuf(dir: &str) -> Utf8PathBuf {
+    let dir = Utf8PathBuf::from(dir);
 
     let m = dir
         .metadata()
-        .unwrap_or_else(|_| panic!("Could not get metadata of dir: {}", dir.display()));
-    assert!(m.is_dir(), "Not a dir: {}", dir.display());
+        .unwrap_or_else(|_| panic!("Could not get metadata of dir: {dir}"));
+    assert!(m.is_dir(), "Not a dir: {dir}");
     dir
 }
 
@@ -90,20 +91,9 @@ struct FeedConfig {
     url: String,
 }
 
-fn fetch(config: &Config, feed_store: &FeedStore) -> Result<bool> {
+fn fetch(config: &Config, feed_store: &mut FeedStore) -> Result<bool> {
     let fetcher = Fetcher::new(&config.bot_name, &config.from);
-    let mut rebuild = false;
-    for feed in &config.feeds {
-        let url = match Url::parse(&feed.url) {
-            Ok(x) => x,
-            Err(e) => {
-                error!("Error parsing url '{}': {e:?}", feed.url);
-                continue;
-            }
-        };
-        rebuild |= fetcher.fetch(url, feed_store)?;
-    }
-    info!("Done fetching. Rebuild needed: {rebuild}");
+    let rebuild = feed_store.fetch(&fetcher, config.refresh)?;
     Ok(rebuild)
 }
 
@@ -122,15 +112,15 @@ fn main() -> Result<()> {
     let _ = to_checked_pathbuf(&config.templates_dir);
     let _ = to_checked_pathbuf(&config.out_dir);
 
-    let feed_store = FeedStore::new(&config.feed_dir);
+    let mut feed_store = FeedStore::new(&config.feed_dir, &config.feeds);
     let should_build = if args.no_fetch {
         true
     } else {
-        fetch(&config, &feed_store)?
+        fetch(&config, &mut feed_store)?
     };
 
     if should_build {
-        template_engine::build(&config, &feed_store)?;
+        template_engine::build(&config, &mut feed_store)?;
     }
     Ok(())
 }

src/template_engine.rs

@@ -7,13 +7,12 @@ use std::collections::HashMap;
 use std::fs::File;
 use tera::{from_value, Tera};
 
-pub fn build(config: &Config, feed_store: &FeedStore) -> Result<()> {
+pub fn build(config: &Config, feed_store: &mut FeedStore) -> Result<()> {
     let mut tera = create_tera(&config.templates_dir)?;
     let out_dir = to_checked_pathbuf(&config.out_dir);
 
     let mut context = tera::Context::new();
-    let (feeds, entries): (HashMap<String, Feed>, _) =
-        feed_store.collect(&config.feeds, config.max_entries);
+    let (feeds, entries): (HashMap<String, Feed>, _) = feed_store.collect(config.max_entries);
     context.insert("feeds", &feeds);
     context.insert("entries", &entries);
     context.insert("PKG_AUTHORS", env!("CARGO_PKG_AUTHORS"));
@@ -24,7 +23,7 @@ pub fn build(config: &Config, feed_store: &FeedStore) -> Result<()> {
 
     for name in tera.get_template_names() {
         debug!("Processing template {name}");
-        let file = File::create(format!("{}/{name}", out_dir.display()))?;
+        let file = File::create(format!("{out_dir}/{name}"))?;
         tera.render_to(name, &context, file)?;
     }
     Ok(())
@@ -32,7 +31,7 @@ pub fn build(config: &Config, feed_store: &FeedStore) -> Result<()> {
 
 fn create_tera(templates_dir: &str) -> Result<Tera> {
     let dir = to_checked_pathbuf(templates_dir);
-    let mut tera = tera::Tera::new(&format!("{}/*", &dir.display()))?;
+    let mut tera = tera::Tera::new(&format!("{dir}/*"))?;
     // disable autoescape as this would corrupt urls or the entriy contents. todo check this!
     tera.autoescape_on(vec![]);
     Ok(tera)