kitedb 0.2.3

High-performance embedded graph database
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138

//! Vector embedding operations for multi-file GraphDB
//!
//! Mirrors the single-file vector API but uses GraphDB WAL + delta.

use crate::error::{RayError, Result};
use crate::types::{NodeId, PropKeyId};
use crate::vector::store::{
  create_vector_store, vector_store_get, vector_store_has, vector_store_stats,
};
use crate::vector::{VectorManifest, VectorStoreConfig, VectorStoreStats};

use super::db::GraphDB;
use super::tx::TxHandle;

/// Set a vector embedding for a node
pub fn set_node_vector(
  handle: &mut TxHandle,
  node_id: NodeId,
  prop_key_id: PropKeyId,
  vector: &[f32],
) -> Result<()> {
  if handle.tx.read_only {
    return Err(RayError::ReadOnly);
  }

  // Check dimensions if store already exists
  {
    let stores = handle.db.vector_stores.read();
    if let Some(store) = stores.get(&prop_key_id) {
      if store.config.dimensions != vector.len() {
        return Err(RayError::VectorDimensionMismatch {
          expected: store.config.dimensions,
          got: vector.len(),
        });
      }
    }
  }

  handle
    .tx
    .pending_vector_deletes
    .remove(&(node_id, prop_key_id));

  handle
    .tx
    .pending_vector_sets
    .insert((node_id, prop_key_id), vector.to_vec());

  Ok(())
}

/// Delete a vector embedding for a node
pub fn delete_node_vector(
  handle: &mut TxHandle,
  node_id: NodeId,
  prop_key_id: PropKeyId,
) -> Result<()> {
  if handle.tx.read_only {
    return Err(RayError::ReadOnly);
  }

  handle
    .tx
    .pending_vector_sets
    .remove(&(node_id, prop_key_id));

  handle
    .tx
    .pending_vector_deletes
    .insert((node_id, prop_key_id));

  Ok(())
}

/// Get a vector embedding for a node (committed state)
pub fn get_node_vector_db(
  db: &GraphDB,
  node_id: NodeId,
  prop_key_id: PropKeyId,
) -> Option<Vec<f32>> {
  let delta = db.delta.read();
  if delta.is_node_deleted(node_id) {
    return None;
  }

  let stores = db.vector_stores.read();
  let store = stores.get(&prop_key_id)?;
  vector_store_get(store, node_id).map(|v| v.to_vec())
}

/// Check if a node has a vector embedding (committed state)
pub fn has_node_vector_db(db: &GraphDB, node_id: NodeId, prop_key_id: PropKeyId) -> bool {
  let delta = db.delta.read();
  if delta.is_node_deleted(node_id) {
    return false;
  }

  let stores = db.vector_stores.read();
  if let Some(store) = stores.get(&prop_key_id) {
    return vector_store_has(store, node_id);
  }
  false
}

/// Get a vector store manifest by property key
pub fn get_vector_store(db: &GraphDB, prop_key_id: PropKeyId) -> Option<VectorManifest> {
  let stores = db.vector_stores.read();
  stores.get(&prop_key_id).cloned()
}

/// Get vector store statistics by property key
pub fn get_vector_stats(db: &GraphDB, prop_key_id: PropKeyId) -> Option<VectorStoreStats> {
  let stores = db.vector_stores.read();
  stores.get(&prop_key_id).map(vector_store_stats)
}

/// Ensure a vector store exists with the given dimensions
pub fn get_or_create_vector_store(
  db: &GraphDB,
  prop_key_id: PropKeyId,
  dimensions: usize,
) -> Result<()> {
  let mut stores = db.vector_stores.write();
  if let Some(store) = stores.get(&prop_key_id) {
    if store.config.dimensions != dimensions {
      return Err(RayError::VectorDimensionMismatch {
        expected: store.config.dimensions,
        got: dimensions,
      });
    }
    return Ok(());
  }

  let config = VectorStoreConfig::new(dimensions);
  let manifest = create_vector_store(config);
  stores.insert(prop_key_id, manifest);
  Ok(())
}