Think a bit about how indexers will fit together

quickpeep_indexer/src/backend.rs

@@ -3,4 +3,18 @@ pub mod tantivy;
 
 /// Trait representing a search index backend;
 /// either Tantivy (embedded) or Meilisearch (via HTTP API).
-pub trait Backend {}
+pub trait Backend {
+    fn add_document(&mut self, document: BackendIndependentDocument) -> anyhow::Result<()>;
+
+    fn flush(&mut self) -> anyhow::Result<()>;
+}
+
+/// A backend-independent document struct.
+#[derive(Clone, Debug)]
+pub struct BackendIndependentDocument {
+    pub title: String,
+    pub article_body: String,
+    pub nonarticle_body: String,
+    pub tags: Vec<String>,
+    pub url: String,
+}

quickpeep_indexer/src/backend/tantivy.rs

@@ -1,9 +1,43 @@
+use crate::backend::{Backend, BackendIndependentDocument};
 use std::path::Path;
-use tantivy::schema::Schema;
+use tantivy::schema::{Schema, STORED, TEXT};
+use tantivy::{doc, Index, IndexWriter};
 
-fn experiment_tantivy() {
+fn experiment_tantivy() -> anyhow::Result<()> {
-    let schema = Schema::builder()
+    let mut schema_builder = Schema::builder();
-        // TODO fields
+    // TODO what should our schema look like? Should we have another database with stuff?
-        .build();
+    // (notably we could Zstd-compress things in another datastore, for reduced disk usage...)
-    tantivy::Index::create_in_dir(Path::new("/tmp/tindex"), schema);
+    schema_builder.add_text_field("title", TEXT | STORED);
+    schema_builder.add_text_field("article", TEXT);
+    schema_builder.add_text_field("nonarticle", TEXT);
+    schema_builder.add_text_field("url", STORED);
+    schema_builder.add_facet_field("tags", ());
+    // schema_builder.add_bytes_field()
+    let schema = schema_builder.build();
+    let index = tantivy::Index::create_in_dir(Path::new("/tmp/tindex"), schema)?;
+    let writer = index.writer(100 * 1024 * 1024)?;
+
+    Ok(())
+}
+
+pub struct TantivyBackend {
+    index: Index,
+    index_writer: IndexWriter,
+}
+
+impl Backend for TantivyBackend {
+    fn add_document(&mut self, document: BackendIndependentDocument) -> anyhow::Result<()> {
+        self.index_writer.add_document(doc! {
+            "title" => document.title,
+            "article" => document.article_body,
+            "nonarticle" => document.nonarticle_body,
+            "url" => document.url,
+            "tags" => document.tags
+        })?;
+        todo!()
+    }
+
+    fn flush(&mut self) -> anyhow::Result<()> {
+        todo!()
+    }
 }