267 lines
11 KiB
Rust
267 lines
11 KiB
Rust
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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//! # Storage layer for Notesmachine
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//!
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//! This library implements the core functionality of Notesmachine and
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//! describes that functionality to a storage layer. There's a bit of
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//! intermingling in here which can't be helped, although it may make
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//! sense in the future to separate the decomposition of the note
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//! content into a higher layer.
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//!
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//! Notesmachine storage notes consist of two items: Note and Kasten.
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//! This distinction is somewhat arbitrary, as structurally these two
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//! items are stored in the same table.
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//!
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//! - Boxes have titles (and date metadata)
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//! - Notes have content and a type (and date metadata)
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//! - Notes are stored in boxes
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//! - Notes are positioned with respect to other notes.
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//! - There are two positions:
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//! - Siblings, creating lists
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//! - Children, creating trees like this one
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//! - Notes may have references (pointers) to other boxes
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//! - Notes may be moved around
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//! - Notes may be deleted
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//! - Boxes may be deleted
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//! - When a box is renamed, every reference to that box is auto-edited to
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//! reflect the change. If a box is renamed to match an existing box, the
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//! notes in both boxes are merged.
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//!
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//! Note-to-note relationships form trees, and are kept in a SQL database of
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//! (`parent_id`, `child_id`, `position`, `relationship_type`). The
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//! `position` is a monotonic index on the parent (that is, every pair
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//! (`parent_id`, `position`) must be unique). The `relationship_type` is
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//! an enum and can specify that the relationship is *original*,
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//! *embedding*, or *referencing*. An embedded or referenced note may be
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//! read/write or read-only with respect to the original, but there is only
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//! one original note at any time.
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//!
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//! Note-to-box relationships form a graph, and are kept in the SQL database
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//! as a collection of *edges* from the note to the box (and naturally
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//! vice-versa).
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//!
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//! - Decision: When an original note is deleted, do all references and
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//! embeddings also get deleted, or is the oldest one elevated to be a new
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//! "original"? Or is that something the user may choose?
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//!
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//! - Decision: Should the merging issue be handled at this layer, or would
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//! it make sense to move this to a higher layer, and only provide the
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//! hooks for it here?
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//!
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use crate::errors::NoteStoreError;
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use crate::reference_parser::build_references;
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use crate::store_private::*;
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use crate::structs::*;
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use sqlx::sqlite::SqlitePool;
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use std::cmp;
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// use std::collections::HashMap;
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use std::sync::Arc;
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/// A handle to our Sqlite database.
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#[derive(Clone, Debug)]
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pub struct NoteStore(Arc<SqlitePool>);
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type NoteResult<T> = core::result::Result<T, NoteStoreError>;
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// After wrestling for a while with the fact that 'box' is a reserved
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// word in Rust, I decided to just go with Note (note) and Kasten
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// (box).
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impl NoteStore {
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/// Initializes a new instance of the note store. Note that the
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/// note store holds an Arc internally; this code is (I think)
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/// safe to Send.
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pub async fn new(url: &str) -> NoteResult<Self> {
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let pool = SqlitePool::connect(url).await?;
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Ok(NoteStore(Arc::new(pool)))
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}
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/// Erase all the data in the database and restore it
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/// to its original empty form. Do not use unless you
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/// really, really want that to happen.
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pub async fn reset_database(&self) -> NoteResult<()> {
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reset_database(&*self.0).await.map_err(NoteStoreError::DBError)
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}
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/// Fetch page by slug
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///
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/// Supports the use case of the user navigating to a known place
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/// via a bookmark or other URL. Since the title isn't clear from
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/// the slug, the slug is insufficient to generate a new page, so
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/// this use case says that in the event of a failure to find the
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/// requested page, return a basic NotFound.
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pub async fn get_kasten_by_slug(&self, slug: &str) -> NoteResult<Vec<Note>> {
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let maybekasten = select_kasten_by_slug(&*self.0, slug).await;
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match maybekasten {
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Ok(v) => Ok(v),
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Err(sqlx::Error::RowNotFound) => Err(NoteStoreError::NotFound),
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Err(_) => maybekasten.map_err(NoteStoreError::DBError),
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}
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}
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pub async fn get_kasten_by_title(&self, title: &str) -> NoteResult<Vec<Note>> {
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if title.len() == 0 {
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return Err(NoteStoreError::NotFound);
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}
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let kasten = select_kasten_by_title(&*self.0, title).await?;
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if kasten.len() > 0 {
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return Ok(kasten);
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}
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let references = build_references(&title);
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if references.len() > 0 {
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return Err(NoteStoreError::InvalidNoteStructure(
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"Titles may not contain nested references.".to_string(),
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));
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}
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let mut tx = self.0.begin().await?;
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let slug = generate_slug(&mut tx, title).await?;
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let zettlekasten = create_zettlekasten(&title, &slug);
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let _ = insert_note(&mut tx, &zettlekasten).await?;
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tx.commit().await?;
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Ok(vec![Note::from(zettlekasten)])
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}
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pub async fn add_note(&self, note: &NewNote, parent_id: &str, location: i64) -> NoteResult<String> {
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self.insert_note(note, &ParentId(parent_id.to_string()), location, RelationshipKind::Direct).await
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}
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/// Move a note from one location to another.
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pub async fn move_note(
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&self,
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note_id: &str,
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old_parent_id: &str,
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new_parent_id: &str,
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new_location: i64,
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) -> NoteResult<()> {
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let mut tx = self.0.begin().await?;
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let old_parent_id = ParentId(old_parent_id.to_string());
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let new_parent_id = ParentId(new_parent_id.to_string());
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let note_id = NoteId(note_id.to_string());
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let old_note = select_note_to_note_relationship(&mut tx, &old_parent_id, ¬e_id).await?;
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let old_note_location = old_note.location;
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let old_note_kind = old_note.kind;
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let _ = delete_note_to_note_relationship(&mut tx, &old_parent_id, ¬e_id).await?;
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let _ = close_hole_for_deleted_note(&mut tx, &old_parent_id, old_note_location).await?;
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let parent_max_location = assert_max_child_location_for_note(&mut tx, &new_parent_id).await?;
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let new_location = cmp::min(parent_max_location + 1, new_location);
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let _ = make_room_for_new_note(&mut tx, &new_parent_id, new_location).await?;
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let _ =
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insert_note_to_note_relationship(&mut tx, &new_parent_id, ¬e_id, new_location, &old_note_kind).await?;
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tx.commit().await?;
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Ok(())
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}
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/// Deletes a note. If the note's relationship drops to zero, all
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/// references from that note to pages are also deleted.
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pub async fn delete_note(&self, note_id: &str, note_parent_id: &str) -> NoteResult<()> {
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let mut tx = self.0.begin().await?;
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let note_id = NoteId(note_id.to_string());
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let parent_id = ParentId(note_parent_id.to_string());
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let _ = delete_note_to_note_relationship(&mut tx, &parent_id, ¬e_id);
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// The big one: if zero parents report having an interest in this note, then it,
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// *and any sub-relationships*, go away.
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if count_existing_note_relationships(&mut tx, ¬e_id).await? == 0 {
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let _ = delete_note_to_kasten_relationships(&mut tx, ¬e_id).await?;
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let _ = delete_note(&mut tx, ¬e_id).await?;
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}
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tx.commit().await?;
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Ok(())
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}
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/// Updates a note's content. Completely rebuilds the note's
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/// outgoing edge reference list every time.
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pub async fn update_note_content(&self, note_id: &str, content: &str) -> NoteResult<()> {
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let references = build_references(&content);
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let note_id = NoteId(note_id.to_string());
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let mut tx = self.0.begin().await?;
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let _ = update_note_content(&mut tx, ¬e_id, &content).await?;
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let found_references = find_all_kasten_references_for(&mut tx, &references).await?;
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let new_references = diff_references(&references, &found_references);
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let mut known_reference_ids: Vec<NoteId> = Vec::new();
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for one_reference in new_references.iter() {
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let slug = generate_slug(&mut tx, one_reference).await?;
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let zettlekasten = create_zettlekasten(&one_reference, &slug);
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let _ = insert_note(&mut tx, &zettlekasten).await?;
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known_reference_ids.push(NoteId(slug));
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}
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known_reference_ids.append(&mut found_references.iter().map(|r| NoteId(r.id.clone())).collect());
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let _ = insert_bulk_note_to_kasten_relationships(&mut tx, ¬e_id, &known_reference_ids).await?;
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tx.commit().await?;
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Ok(())
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}
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}
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// The Private stuff
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impl NoteStore {
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// Pretty much the most dangerous function in our system. Has to
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// have ALL the error checking.
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async fn insert_note(&self, note: &NewNote, parent_id: &ParentId, location: i64, kind: RelationshipKind) -> NoteResult<String> {
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if location < 0 {
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return Err(NoteStoreError::InvalidNoteStructure(
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"Add note: A negative position is not valid.".to_string(),
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));
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}
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if parent_id.is_empty() {
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return Err(NoteStoreError::InvalidNoteStructure(
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"Add note: A parent note ID is required.".to_string(),
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));
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}
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if note.id.is_empty() {
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return Err(NoteStoreError::InvalidNoteStructure(
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"Add note: Your note should have an id already".to_string(),
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));
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}
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if note.content.is_empty() {
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return Err(NoteStoreError::InvalidNoteStructure(
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"Add note: Empty notes are not supported.".to_string(),
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));
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}
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let references = build_references(¬e.content);
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let mut tx = self.0.begin().await?;
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let location = cmp::min(
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assert_max_child_location_for_note(&mut tx, parent_id).await? + 1,
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location,
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);
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let note_id = NoteId(note.id.clone());
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insert_note(&mut tx, ¬e).await?;
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make_room_for_new_note(&mut tx, &parent_id, location).await?;
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insert_note_to_note_relationship(&mut tx, &parent_id, ¬e_id, location, &kind).await?;
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let found_references = find_all_kasten_references_for(&mut tx, &references).await?;
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let new_references = diff_references(&references, &found_references);
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let mut known_reference_ids: Vec<NoteId> = Vec::new();
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for one_reference in new_references.iter() {
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let slug = generate_slug(&mut tx, one_reference).await?;
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let zettlekasten = create_zettlekasten(&one_reference, &slug);
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let _ = insert_note(&mut tx, &zettlekasten).await?;
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known_reference_ids.push(NoteId(slug));
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}
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known_reference_ids.append(&mut found_references.iter().map(|r| NoteId(r.id.clone())).collect());
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let _ = insert_bulk_note_to_kasten_relationships(&mut tx, ¬e_id, &known_reference_ids).await?;
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tx.commit().await?;
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Ok(note_id.to_string())
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}
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}
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