Clarify and handle 'No domain for URL' error in a better way

quickpeep_indexer/src/bin/qp-indexer.rs

@@ -318,7 +318,8 @@ pub async fn build_seed_lookup_table(
         match &seed.url {
             UrlOrUrlPattern::Url(url_str) => {
                 let url = Url::parse(url_str)?;
-                let reduced_domain = get_reduced_domain(&url)?;
+                let reduced_domain = get_reduced_domain(&url)
+                    .with_context(|| format!("No domain in seed: '{url}'!"))?;
                 seed_lookup
                     .by_reduced_domain
                     .insert(reduced_domain.into(), seed);
@@ -338,7 +339,8 @@ impl SeedLookupTable {
             return Ok(Some(seed));
         }
 
-        let domain = get_reduced_domain(url)?;
+        let domain = get_reduced_domain(url)
+            .with_context(|| format!("No domain in looked up URL: '{url}'"))?;
         if let Some(seed) = self.by_reduced_domain.get(domain.as_ref()) {
             return Ok(Some(seed));
         }

quickpeep_raker/src/bin/qp-seedrake.rs

@@ -169,7 +169,8 @@ async fn import_and_flush_batch_seeds(
     for seed in buf.drain(..) {
         let as_url = Url::parse(seed.url.as_str())
             .with_context(|| format!("Failed to parse {:?} as URL", seed.url))?;
-        let domain = get_reduced_domain(&as_url)?;
+        let domain = get_reduced_domain(&as_url)
+            .with_context(|| format!("No domain in seed URL '{as_url}'!"))?;
 
         let allowed_domain_record = txn.get_allowed_domain_record(domain.borrow())?;
 
@@ -244,7 +245,8 @@ async fn import_and_flush_batch_weeds(
     for seed in buf.drain(..) {
         let as_url = Url::parse(seed.url.as_str())
             .with_context(|| format!("Failed to parse {:?} as URL", seed.url))?;
-        let domain = get_reduced_domain(&as_url)?;
+        let domain = get_reduced_domain(&as_url)
+            .with_context(|| format!("No domain in weed URL '{as_url}'!"))?;
 
         let weed_domain_record = txn.get_weed_domain_record(domain.borrow())?;
 

quickpeep_raker/src/raking/references.rs

@@ -45,6 +45,12 @@ pub fn find_references(
                 } => {
                     if !nofollow {
                         if let Ok(full_url) = page_url.join(&href) {
+                            if full_url.domain().is_none() {
+                                // Skip URLs that don't have a domain after being made absolute.
+                                // This also skips IP addresses: we probably don't want to bother
+                                // indexing content from explicit IP addresses.
+                                continue;
+                            }
                             if SUPPORTED_SCHEMES.contains(&full_url.scheme()) {
                                 refs.insert(RakedReference {
                                     target: clean_url(&full_url).to_string(),
@@ -72,6 +78,10 @@ pub fn find_references(
     add_link_refs(&doc, &mut refs, &page_url);
 
     for feed in feeds {
+        if feed.domain().is_none() {
+            // same rationale as above.
+            continue;
+        }
         refs.insert(RakedReference {
             target: clean_url(feed).as_str().to_owned(),
             kind: ReferenceKind::HeaderLinkedFeed,

quickpeep_raker/src/raking/task.rs

@@ -454,7 +454,9 @@ impl TaskContext {
                 // TODO(future) do we want to log this somewhere?
                 // or at least a metric
 
-                let domain = get_reduced_domain(url)?;
+                let domain = get_reduced_domain(url).with_context(|| {
+                    format!("No domain in URL '{url}' for which we are processing the outcome!")
+                })?;
                 let url = url.clone();
 
                 // TODO(feature) add 1.1× the previous backoff, if there was one.
@@ -518,7 +520,9 @@ impl EventProcessor<'_> {
         self.store
             .as_ref()
             .async_rw_txn(move |txn| {
-                let domain = get_reduced_domain(&url)?;
+                let domain = get_reduced_domain(&url).with_context(|| {
+                    format!("No domain for URL '{url}' for which we are processing the page!")
+                })?;
                 txn.mark_url_as_visited(
                     domain.as_ref(),
                     url.as_ref(),
@@ -546,7 +550,9 @@ impl EventProcessor<'_> {
         self.store
             .as_ref()
             .async_rw_txn(move |txn| {
-                let domain = get_reduced_domain(&url)?;
+                let domain = get_reduced_domain(&url).with_context(|| {
+                    format!("No domain for URL '{url}' for which we are processing an icon!")
+                })?;
                 txn.mark_url_as_visited(
                     domain.as_ref(),
                     url.as_ref(),
@@ -577,7 +583,9 @@ impl EventProcessor<'_> {
         self.store
             .as_ref()
             .async_rw_txn(move |txn| {
-                let domain = get_reduced_domain(&url)?;
+                let domain = get_reduced_domain(&url).with_context(|| {
+                    format!("No domain for URL '{url}' for which we are processing refs!")
+                })?;
                 txn.mark_url_as_visited(
                     domain.as_ref(),
                     url.as_ref(),
@@ -638,7 +646,9 @@ impl EventProcessor<'_> {
         self.store
             .as_ref()
             .async_rw_txn(move |txn| {
-                let domain = get_reduced_domain(&url)?;
+                let domain = get_reduced_domain(&url).with_context(|| {
+                    format!("No domain for URL '{url}' for which we are processing a rejection!")
+                })?;
                 txn.mark_url_as_visited(
                     domain.as_ref(),
                     url.as_ref(),

quickpeep_raker/src/storage.rs

@@ -516,7 +516,8 @@ impl<'a> RakerTxn<'a, RW> {
         let visited_urls = &self.mdbx.borrow_dbs().visited_urls;
 
         let url = Url::parse(url_str)?;
-        let url_domain = get_reduced_domain(&url)?;
+        let url_domain = get_reduced_domain(&url)
+            .with_context(|| format!("No domain for to-be-enqueued URL: '{url}'!"))?;
 
         let queue_key = format!("{}\n{}", url_domain, url);
 
@@ -568,7 +569,8 @@ impl<'a> RakerTxn<'a, RW> {
         let urls_on_hold = &self.mdbx.borrow_dbs().urls_on_hold;
 
         let url = Url::parse(url_str)?;
-        let url_domain = get_reduced_domain(&url)?;
+        let url_domain = get_reduced_domain(&url)
+            .with_context(|| format!("No domain for to-be-put-on-hold URL: '{url}'!"))?;
 
         let queue_key = format!("{}\n{}", url_domain, url);
 

quickpeep_utils/src/urls.rs

@@ -1,11 +1,11 @@
-use anyhow::Context;
 use std::borrow::Cow;
 use url::Url;
 
-pub fn get_reduced_domain(url: &Url) -> anyhow::Result<Cow<'_, str>> {
-    let domain = url.domain().context("URLs must have domains")?;
+pub fn get_reduced_domain(url: &Url) -> Option<Cow<'_, str>> {
+    // If the URL does not have a host or not a domain (e.g. IP address) then exits with None here.
+    let domain = url.domain()?;
 
-    Ok(Cow::Borrowed(match domain.strip_prefix("www.") {
+    Some(Cow::Borrowed(match domain.strip_prefix("www.") {
         Some(stripped) => stripped,
         None => domain,
     }))