murr 0.2.1

Columnar in-memory cache for AI/ML inference workloads
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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301

use std::io::Cursor;
use std::sync::Arc;

use arrow::array::{Float32Array, StringArray};
use arrow::datatypes::{DataType, Field, Schema};
use arrow::ipc::reader::StreamReader;
use arrow::ipc::writer::StreamWriter;
use arrow::record_batch::RecordBatch;
use axum::Router;
use axum::body::Body;
use axum::http::{Request, StatusCode};
use http_body_util::BodyExt;
use parquet::arrow::arrow_writer::ArrowWriter;
use serde_json::{Value, json};
use tempfile::TempDir;
use tower::ServiceExt;

use murr::api::MurrHttpService;
use murr::conf::{BackendConfig, Config, StorageConfig};
use murr::io::store::rocksdb::plain::PlainConfig;
use murr::service::MurrService;

async fn setup() -> (TempDir, Router) {
    let dir = TempDir::new().unwrap();
    let config = Config {
        storage: StorageConfig {
            path: dir.path().to_path_buf(),
            backend: BackendConfig::Mmap(PlainConfig::default()),
        },
        ..Config::default()
    };
    let service = Arc::new(MurrService::new(config).unwrap());
    let api = MurrHttpService::new(service);
    let router = api.router();
    (dir, router)
}

async fn body_bytes(router: Router, req: Request<Body>) -> (StatusCode, Vec<u8>) {
    let response = router.oneshot(req).await.unwrap();
    let status = response.status();
    let bytes = response
        .into_body()
        .collect()
        .await
        .unwrap()
        .to_bytes()
        .to_vec();
    (status, bytes)
}

async fn body_json(router: Router, req: Request<Body>) -> (StatusCode, Value) {
    let (status, bytes) = body_bytes(router, req).await;
    let json: Value = serde_json::from_slice(&bytes).unwrap();
    (status, json)
}

fn table_schema_json() -> Value {
    json!({
        "key": "id",
        "columns": {
            "id": {"dtype": "utf8", "nullable": false},
            "score": {"dtype": "float32", "nullable": true}
        }
    })
}

fn arrow_ipc_batch(keys: &[&str], scores: &[f32]) -> Vec<u8> {
    let schema = Arc::new(Schema::new(vec![
        Field::new("id", DataType::Utf8, false),
        Field::new("score", DataType::Float32, true),
    ]));
    let key_array: StringArray = keys.iter().map(|k| Some(*k)).collect();
    let score_array: Float32Array = scores.iter().map(|v| Some(*v)).collect();
    let batch = RecordBatch::try_new(
        schema.clone(),
        vec![Arc::new(key_array), Arc::new(score_array)],
    )
    .unwrap();

    let mut buf = Vec::new();
    let mut writer = StreamWriter::try_new(&mut buf, &schema).unwrap();
    writer.write(&batch).unwrap();
    writer.finish().unwrap();
    buf
}

#[tokio::test]
async fn test_openapi() {
    let (_dir, router) = setup().await;
    let req = Request::get("/openapi.json").body(Body::empty()).unwrap();
    let (status, json) = body_json(router, req).await;
    assert_eq!(status, StatusCode::OK);
    assert_eq!(json["openapi"], "3.1.0");
    assert!(json["paths"].is_object());
    assert!(json["paths"]["/health"].is_object());
    assert!(json["paths"]["/api/v1/table/{name}/fetch"].is_object());
}

#[tokio::test]
async fn test_health() {
    let (_dir, router) = setup().await;
    let req = Request::get("/health").body(Body::empty()).unwrap();
    let (status, bytes) = body_bytes(router, req).await;
    assert_eq!(status, StatusCode::OK);
    assert_eq!(bytes, b"OK");
}

#[tokio::test]
async fn test_get_nonexistent_table() {
    let (_dir, router) = setup().await;
    let req = Request::get("/api/v1/table/nope/schema")
        .body(Body::empty())
        .unwrap();
    let (status, _) = body_json(router, req).await;
    assert_eq!(status, StatusCode::NOT_FOUND);
}

#[tokio::test]
async fn test_create_duplicate_table() {
    let (_dir, router) = setup().await;
    let schema = serde_json::to_vec(&table_schema_json()).unwrap();

    let req = Request::put("/api/v1/table/features")
        .header("content-type", "application/json")
        .body(Body::from(schema.clone()))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::CREATED);

    let req = Request::put("/api/v1/table/features")
        .header("content-type", "application/json")
        .body(Body::from(schema))
        .unwrap();
    let (status, _) = body_bytes(router, req).await;
    assert_eq!(status, StatusCode::CONFLICT);
}

#[tokio::test]
async fn test_list_and_get_table() {
    let (_dir, router) = setup().await;
    let schema = serde_json::to_vec(&table_schema_json()).unwrap();

    // Create table
    let req = Request::put("/api/v1/table/features")
        .header("content-type", "application/json")
        .body(Body::from(schema))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::CREATED);

    // List tables
    let req = Request::get("/api/v1/table").body(Body::empty()).unwrap();
    let (status, json) = body_json(router.clone(), req).await;
    assert_eq!(status, StatusCode::OK);
    assert!(json.get("features").is_some());
    assert_eq!(json["features"]["key"], "id");

    // Get single table
    let req = Request::get("/api/v1/table/features/schema")
        .body(Body::empty())
        .unwrap();
    let (status, json) = body_json(router, req).await;
    assert_eq!(status, StatusCode::OK);
    assert_eq!(json["key"], "id");
    assert!(json["columns"]["id"].is_object());
    assert!(json["columns"]["score"].is_object());
}

#[tokio::test]
async fn test_full_round_trip() {
    let (_dir, router) = setup().await;

    // 1. Create table
    let schema = serde_json::to_vec(&table_schema_json()).unwrap();
    let req = Request::put("/api/v1/table/features")
        .header("content-type", "application/json")
        .body(Body::from(schema))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::CREATED);

    // 2. Write segment 1 as JSON
    let write_json = json!({
        "columns": {
            "id": ["a", "b"],
            "score": [1.0, 2.0]
        }
    });
    let req = Request::put("/api/v1/table/features/write")
        .header("content-type", "application/json")
        .body(Body::from(serde_json::to_vec(&write_json).unwrap()))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::OK);

    // 3. Write segment 2 as Arrow IPC
    let ipc_bytes = arrow_ipc_batch(&["c"], &[3.0]);
    let req = Request::put("/api/v1/table/features/write")
        .header("content-type", "application/vnd.apache.arrow.stream")
        .body(Body::from(ipc_bytes))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::OK);

    // 4. Fetch as JSON
    let fetch_body = json!({"keys": ["a", "b", "c"], "columns": ["score"]});
    let req = Request::post("/api/v1/table/features/fetch")
        .header("content-type", "application/json")
        .header("accept", "application/json")
        .body(Body::from(serde_json::to_vec(&fetch_body).unwrap()))
        .unwrap();
    let (status, json) = body_json(router.clone(), req).await;
    assert_eq!(status, StatusCode::OK);

    let scores = json["columns"]["score"].as_array().unwrap();
    assert_eq!(scores.len(), 3);
    assert_eq!(scores[0].as_f64().unwrap() as f32, 1.0);
    assert_eq!(scores[1].as_f64().unwrap() as f32, 2.0);
    assert_eq!(scores[2].as_f64().unwrap() as f32, 3.0);

    // 5. Fetch as Arrow IPC
    let req = Request::post("/api/v1/table/features/fetch")
        .header("content-type", "application/json")
        .header("accept", "application/vnd.apache.arrow.stream")
        .body(Body::from(serde_json::to_vec(&fetch_body).unwrap()))
        .unwrap();
    let (status, bytes) = body_bytes(router, req).await;
    assert_eq!(status, StatusCode::OK);

    let cursor = Cursor::new(bytes);
    let mut reader = StreamReader::try_new(cursor, None).unwrap();
    let batch = reader.next().unwrap().unwrap();
    assert_eq!(batch.num_rows(), 3);

    let scores = batch
        .column(0)
        .as_any()
        .downcast_ref::<Float32Array>()
        .unwrap();
    assert_eq!(scores.value(0), 1.0);
    assert_eq!(scores.value(1), 2.0);
    assert_eq!(scores.value(2), 3.0);
}

fn parquet_batch(keys: &[&str], scores: &[f32]) -> Vec<u8> {
    let schema = Arc::new(Schema::new(vec![
        Field::new("id", DataType::Utf8, false),
        Field::new("score", DataType::Float32, true),
    ]));
    let key_array: StringArray = keys.iter().map(|k| Some(*k)).collect();
    let score_array: Float32Array = scores.iter().map(|v| Some(*v)).collect();
    let batch = RecordBatch::try_new(
        schema.clone(),
        vec![Arc::new(key_array), Arc::new(score_array)],
    )
    .unwrap();

    let mut buf = Vec::new();
    let mut writer = ArrowWriter::try_new(&mut buf, schema, None).unwrap();
    writer.write(&batch).unwrap();
    writer.close().unwrap();
    buf
}

#[tokio::test]
async fn test_write_parquet() {
    let (_dir, router) = setup().await;

    // 1. Create table
    let schema = serde_json::to_vec(&table_schema_json()).unwrap();
    let req = Request::put("/api/v1/table/features")
        .header("content-type", "application/json")
        .body(Body::from(schema))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::CREATED);

    // 2. Write as Parquet
    let pq_bytes = parquet_batch(&["x", "y", "z"], &[10.0, 20.0, 30.0]);
    let req = Request::put("/api/v1/table/features/write")
        .header("content-type", "application/vnd.apache.parquet")
        .body(Body::from(pq_bytes))
        .unwrap();
    let (status, _) = body_bytes(router.clone(), req).await;
    assert_eq!(status, StatusCode::OK);

    // 3. Fetch and verify
    let fetch_body = json!({"keys": ["x", "y", "z"], "columns": ["score"]});
    let req = Request::post("/api/v1/table/features/fetch")
        .header("content-type", "application/json")
        .body(Body::from(serde_json::to_vec(&fetch_body).unwrap()))
        .unwrap();
    let (status, json) = body_json(router, req).await;
    assert_eq!(status, StatusCode::OK);

    let scores = json["columns"]["score"].as_array().unwrap();
    assert_eq!(scores.len(), 3);
    assert_eq!(scores[0].as_f64().unwrap() as f32, 10.0);
    assert_eq!(scores[1].as_f64().unwrap() as f32, 20.0);
    assert_eq!(scores[2].as_f64().unwrap() as f32, 30.0);
}