Add facility to qp-indexer that lets it download rakepacks from a feed

Cargo.lock

@@ -3766,11 +3766,13 @@ dependencies = [
  "quickpeep_seed_parser",
  "quickpeep_structs",
  "quickpeep_utils",
+ "reqwest",
  "ron",
  "serde",
  "serde_bare",
  "serde_json",
  "smartstring",
+ "tempfile",
  "tokio",
  "url",
  "zstd",

quickpeep_indexer/Cargo.toml

@@ -30,6 +30,11 @@ patricia_tree = "0.3.1"
 # For decompression of emitted packs. 0.11.1+zstd.1.5.2
 zstd = "0.11.1"
 
+# HTTP Requests
+reqwest = { version = "0.11.9", features = ["blocking"] }
+
+tempfile = "3.3.0"
+
 quickpeep_densedoc = { path = "../quickpeep_densedoc" }
 quickpeep_index = { path = "../quickpeep_index" }
 quickpeep_structs = { path = "../quickpeep_structs" }

quickpeep_indexer/src/bin/qp-indexer.rs

@@ -2,9 +2,9 @@ use anyhow::{bail, Context};
 use clap::Parser;
 use colour::{blue, yellow_ln};
 use env_logger::Env;
-use std::collections::HashMap;
-use std::fs::File;
-use std::io::{BufRead, BufReader};
+use std::collections::{BTreeSet, HashMap};
+use std::fs::{File, OpenOptions};
+use std::io::{BufRead, BufReader, Write};
 
 use patricia_tree::PatriciaMap;
 use quickpeep_densedoc::DenseTree;
@@ -20,7 +20,8 @@ use quickpeep_structs::rake_entries::{
 };
 use quickpeep_utils::urls::get_reduced_domain;
 use smartstring::alias::CompactString;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
+use tempfile::NamedTempFile;
 use tokio::sync::mpsc::Receiver;
 use url::Url;
 
@@ -30,6 +31,11 @@ pub struct Opts {
     #[clap(long = "config")]
     config: Option<PathBuf>,
 
+    /// If specified, rakepacks from a feed will automatically be fetched and indexed.
+    /// The rakepacks are tracked as having been processed.
+    #[clap(long = "feed")]
+    feed: Option<Url>,
+
     rakepacks: Vec<PathBuf>,
 }
 
@@ -62,46 +68,146 @@ pub async fn main() -> anyhow::Result<()> {
 
     let mut indexer_backend = config.open_indexer_backend()?;
 
+    if let Some(feed) = opts.feed {
+        let processed_rakepack_path = config
+            .processed_rakepack_path()
+            .context("can't get a suitable location to track processed rakepacks")?;
+        handle_pack_feed(
+            feed,
+            &mut indexer_backend,
+            processed_rakepack_path,
+            &seed_lookup,
+            &icon_store,
+        )
+        .context("failed to handle pack feed")?;
+    }
+
     for pack in opts.rakepacks {
-        blue!("Indexing: ");
-        yellow_ln!("{:?}", pack);
-
-        let file = File::open(&pack)?;
-        let decompressor = zstd::stream::Decoder::new(file)?;
-        // TODO the decompressor has a buffer already, but we need this to see the end
-        let mut buf_reader = BufReader::new(decompressor);
-        let schema: String =
-            serde_bare::from_reader(&mut buf_reader).context("failed to read schema ver")?;
-
-        match schema.as_ref() {
-            SCHEMA_RAKED_PAGES => {
-                // TODO(unstable): this condition is `.has_data_left()` but it's unstable.
-                while buf_reader.fill_buf().map(|b| !b.is_empty())? {
-                    handle_page_pack(&mut buf_reader, &seed_lookup, &mut indexer_backend)
-                        .context("failed to handle page pack")?;
-                }
-            }
-            SCHEMA_RAKED_ICONS => {
-                // TODO(unstable): this condition is `.has_data_left()` but it's unstable.
-                while buf_reader.fill_buf().map(|b| !b.is_empty())? {
-                    handle_icon_pack(&mut buf_reader, &icon_store)
-                        .context("failed to handle icon pack")?;
-                }
-            }
-            _ => {
-                bail!(
-                    "Wrong schema version: wanted e.g. {:?}, got {:?}",
-                    SCHEMA_RAKED_PAGES,
-                    &schema
-                );
-            }
-        }
+        handle_pack(&pack, &mut indexer_backend, &seed_lookup, &icon_store)
+            .with_context(|| format!("Whilst handling pack: {pack:?}"))?;
     }
     indexer_backend.flush()?;
 
     Ok(())
 }
 
+pub fn handle_pack_feed(
+    feed_url: Url,
+    indexer_backend: &mut Box<dyn Backend>,
+    processed_list_path: PathBuf,
+    seed_lookup: &SeedLookupTable,
+    icon_store: &IconStore,
+) -> anyhow::Result<()> {
+    blue!("Scanning feed: ");
+    yellow_ln!("{:?}", feed_url);
+
+    let new_packs =
+        find_new_packs(feed_url.clone(), &processed_list_path).context("finding new packs")?;
+    let mut processed_log = OpenOptions::new()
+        .append(true)
+        .create(true)
+        .open(&processed_list_path)
+        .context("can't open processed list for append")?;
+
+    for pack_name in new_packs {
+        let pack_url = feed_url
+            .join(&pack_name)
+            .context("Can't resolve URL of new pack")?;
+
+        blue!("Downloading: ");
+        yellow_ln!("{:?}", pack_url);
+        let mut temp_file = NamedTempFile::new().context("opening temp file")?;
+
+        reqwest::blocking::get(pack_url.clone())
+            .context("failed to request pack")?
+            .error_for_status()?
+            .copy_to(temp_file.as_file_mut())
+            .context("failed to download pack to temp file")?;
+
+        handle_pack(temp_file.path(), indexer_backend, seed_lookup, icon_store).with_context(
+            || {
+                format!(
+                    "Whilst handling pack: {:?} ({:?})",
+                    temp_file.path(),
+                    pack_url
+                )
+            },
+        )?;
+
+        processed_log.write(format!("\n{}", &pack_name).as_bytes())?;
+        processed_log.flush()?;
+    }
+    Ok(())
+}
+
+fn find_new_packs(feed_url: Url, processed_list_path: &Path) -> anyhow::Result<BTreeSet<String>> {
+    let processed_file = OpenOptions::new()
+        .read(true)
+        .create(true)
+        .open(processed_list_path)?;
+    let br = BufReader::new(processed_file);
+    let processed: Result<BTreeSet<String>, _> = br.lines().collect();
+    let processed = processed.context("failed to read local processed list")?;
+
+    let mut unprocessed: BTreeSet<String> = BTreeSet::new();
+
+    let feed_lines = BufReader::new(reqwest::blocking::get(feed_url)?.error_for_status()?).lines();
+    for line in feed_lines {
+        let line = line?;
+        if line.is_empty() {
+            continue;
+        }
+        if processed.contains(&line) {
+            continue;
+        }
+        unprocessed.insert(line.to_owned());
+    }
+
+    Ok(unprocessed)
+}
+
+pub fn handle_pack(
+    pack: &Path,
+    indexer_backend: &mut Box<dyn Backend>,
+    seed_lookup: &SeedLookupTable,
+    icon_store: &IconStore,
+) -> anyhow::Result<()> {
+    blue!("Indexing: ");
+    yellow_ln!("{:?}", pack);
+
+    let file = File::open(&pack)?;
+    let decompressor = zstd::stream::Decoder::new(file)?;
+    // TODO the decompressor has a buffer already, but we need this to see the end
+    let mut buf_reader = BufReader::new(decompressor);
+    let schema: String =
+        serde_bare::from_reader(&mut buf_reader).context("failed to read schema ver")?;
+
+    match schema.as_ref() {
+        SCHEMA_RAKED_PAGES => {
+            // TODO(unstable): this condition is `.has_data_left()` but it's unstable.
+            while buf_reader.fill_buf().map(|b| !b.is_empty())? {
+                handle_page_pack(&mut buf_reader, &seed_lookup, indexer_backend)
+                    .context("failed to handle page pack")?;
+            }
+        }
+        SCHEMA_RAKED_ICONS => {
+            // TODO(unstable): this condition is `.has_data_left()` but it's unstable.
+            while buf_reader.fill_buf().map(|b| !b.is_empty())? {
+                handle_icon_pack(&mut buf_reader, &icon_store)
+                    .context("failed to handle icon pack")?;
+            }
+        }
+        _ => {
+            bail!(
+                "Wrong schema version: wanted e.g. {:?}, got {:?}",
+                SCHEMA_RAKED_PAGES,
+                &schema
+            );
+        }
+    }
+    Ok(())
+}
+
 pub fn handle_page_pack(
     buf_reader: &mut impl BufRead,
     seed_lookup: &SeedLookupTable,

quickpeep_indexer/src/config.rs

@@ -55,4 +55,17 @@ impl IndexerConfig {
             }
         }
     }
+
+    /// Returns the path to a text file which can be used for storing a list of processed rakepacks
+    /// (needed for following rakepack streams over a network).
+    pub fn processed_rakepack_path(&self) -> anyhow::Result<PathBuf> {
+        match &self.index.backend {
+            BackendConfig::Tantivy(tantivy) => {
+                Ok(tantivy.index_dir.join("processed_rakepacks.lst"))
+            }
+            BackendConfig::Meili(_) => {
+                todo!()
+            }
+        }
+    }
 }