Port IndexValueWriter

packages/firestore/src/index/directional_index_byte_encoder.ts

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+/**
+ * @license
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { ByteString } from '../util/byte_string';
+
+/** An index value encoder.  */
+export interface DirectionalIndexByteEncoder {
+  // Note: This code is copied from the backend. Code that is not used by
+  // Firestore was removed.
+  writeBytes(value: ByteString): void;
+  writeString(value: string): void;
+  writeNumber(value: number): void;
+  writeInfinity(): void;
+}

packages/firestore/src/index/firestore_index_value_writer.ts

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+/**
+ * @license
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { DocumentKey } from '../model/document_key';
+import { normalizeByteString, normalizeNumber } from '../model/normalize';
+import { isMaxValue } from '../model/values';
+import { ArrayValue, MapValue, Value } from '../protos/firestore_proto_api';
+import { fail } from '../util/assert';
+import { isNegativeZero } from '../util/types';
+
+import { DirectionalIndexByteEncoder } from './directional_index_byte_encoder';
+
+// Note: This code is copied from the backend. Code that is not used by
+// Firestore was removed.
+
+const INDEX_TYPE_NULL = 5;
+const INDEX_TYPE_BOOLEAN = 10;
+const INDEX_TYPE_NAN = 13;
+const INDEX_TYPE_NUMBER = 15;
+const INDEX_TYPE_TIMESTAMP = 20;
+const INDEX_TYPE_STRING = 25;
+const INDEX_TYPE_BLOB = 30;
+const INDEX_TYPE_REFERENCE = 37;
+const INDEX_TYPE_GEOPOINT = 45;
+const INDEX_TYPE_ARRAY = 50;
+const INDEX_TYPE_MAP = 55;
+const INDEX_TYPE_REFERENCE_SEGMENT = 60;
+
+// A terminator that indicates that a truncatable value was not truncated.
+// This must be smaller than all other type labels.
+const NOT_TRUNCATED = 2;
+
+/** Firestore index value writer.  */
+export class FirestoreIndexValueWriter {
+  static INSTANCE = new FirestoreIndexValueWriter();
+
+  private constructor() {}
+
+  // The write methods below short-circuit writing terminators for values
+  // containing a (terminating) truncated value.
+  //
+  // As an example, consider the resulting encoding for:
+  //
+  // ["bar", [2, "foo"]] -> (STRING, "bar", TERM, ARRAY, NUMBER, 2, STRING, "foo", TERM, TERM, TERM)
+  // ["bar", [2, truncated("foo")]] -> (STRING, "bar", TERM, ARRAY, NUMBER, 2, STRING, "foo", TRUNC)
+  // ["bar", truncated(["foo"])] -> (STRING, "bar", TERM, ARRAY. STRING, "foo", TERM, TRUNC)
+
+  /** Writes an index value.  */
+  writeIndexValue(value: Value, encoder: DirectionalIndexByteEncoder): void {
+    this.writeIndexValueAux(value, encoder);
+    // Write separator to split index values
+    // (see go/firestore-storage-format#encodings).
+    encoder.writeInfinity();
+  }
+
+  private writeIndexValueAux(
+    indexValue: Value,
+    encoder: DirectionalIndexByteEncoder
+  ): void {
+    if ('nullValue' in indexValue) {
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_NULL);
+    } else if ('booleanValue' in indexValue) {
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_BOOLEAN);
+      encoder.writeNumber(indexValue.booleanValue ? 1 : 0);
+    } else if ('integerValue' in indexValue) {
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_NUMBER);
+      encoder.writeNumber(normalizeNumber(indexValue.integerValue));
+    } else if ('doubleValue' in indexValue) {
+      const n = normalizeNumber(indexValue.doubleValue);
+      if (isNaN(n)) {
+        this.writeValueTypeLabel(encoder, INDEX_TYPE_NAN);
+      } else {
+        this.writeValueTypeLabel(encoder, INDEX_TYPE_NUMBER);
+        if (isNegativeZero(n)) {
+          // -0.0, 0 and 0.0 are all considered the same
+          encoder.writeNumber(0.0);
+        } else {
+          encoder.writeNumber(n);
+        }
+      }
+    } else if ('timestampValue' in indexValue) {
+      const timestamp = indexValue.timestampValue!;
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_TIMESTAMP);
+      if (typeof timestamp === 'string') {
+        encoder.writeString(timestamp);
+      } else {
+        encoder.writeString(`${timestamp.seconds || ''}`);
+        encoder.writeNumber(timestamp.nanos || 0);
+      }
+    } else if ('stringValue' in indexValue) {
+      this.writeIndexString(indexValue.stringValue!, encoder);
+      this.writeTruncationMarker(encoder);
+    } else if ('bytesValue' in indexValue) {
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_BLOB);
+      encoder.writeBytes(normalizeByteString(indexValue.bytesValue!));
+      this.writeTruncationMarker(encoder);
+    } else if ('referenceValue' in indexValue) {
+      this.writeIndexEntityRef(indexValue.referenceValue!, encoder);
+    } else if ('geoPointValue' in indexValue) {
+      const geoPoint = indexValue.geoPointValue!;
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_GEOPOINT);
+      encoder.writeNumber(geoPoint.latitude || 0);
+      encoder.writeNumber(geoPoint.longitude || 0);
+    } else if ('mapValue' in indexValue) {
+      if (isMaxValue(indexValue)) {
+        this.writeValueTypeLabel(encoder, Number.MAX_SAFE_INTEGER);
+      } else {
+        this.writeIndexMap(indexValue.mapValue!, encoder);
+        this.writeTruncationMarker(encoder);
+      }
+    } else if ('arrayValue' in indexValue) {
+      this.writeIndexArray(indexValue.arrayValue!, encoder);
+      this.writeTruncationMarker(encoder);
+    } else {
+      fail('unknown index value type ' + indexValue);
+    }
+  }
+
+  private writeIndexString(
+    stringIndexValue: string,
+    encoder: DirectionalIndexByteEncoder
+  ): void {
+    this.writeValueTypeLabel(encoder, INDEX_TYPE_STRING);
+    this.writeUnlabeledIndexString(stringIndexValue, encoder);
+  }
+
+  private writeUnlabeledIndexString(
+    stringIndexValue: string,
+    encoder: DirectionalIndexByteEncoder
+  ): void {
+    encoder.writeString(stringIndexValue);
+  }
+
+  private writeIndexMap(
+    mapIndexValue: MapValue,
+    encoder: DirectionalIndexByteEncoder
+  ): void {
+    const map = mapIndexValue.fields || {};
+    this.writeValueTypeLabel(encoder, INDEX_TYPE_MAP);
+    for (const key of Object.keys(map)) {
+      this.writeIndexString(key, encoder);
+      this.writeIndexValueAux(map[key], encoder);
+    }
+  }
+
+  private writeIndexArray(
+    arrayIndexValue: ArrayValue,
+    encoder: DirectionalIndexByteEncoder
+  ): void {
+    const values = arrayIndexValue.values || [];
+    this.writeValueTypeLabel(encoder, INDEX_TYPE_ARRAY);
+    for (const element of values) {
+      this.writeIndexValueAux(element, encoder);
+    }
+  }
+
+  private writeIndexEntityRef(
+    referenceValue: string,
+    encoder: DirectionalIndexByteEncoder
+  ): void {
+    this.writeValueTypeLabel(encoder, INDEX_TYPE_REFERENCE);
+    const path = DocumentKey.fromName(referenceValue).path;
+    path.forEach(segment => {
+      this.writeValueTypeLabel(encoder, INDEX_TYPE_REFERENCE_SEGMENT);
+      this.writeUnlabeledIndexString(segment, encoder);
+    });
+  }
+
+  private writeValueTypeLabel(
+    encoder: DirectionalIndexByteEncoder,
+    typeOrder: number
+  ): void {
+    encoder.writeNumber(typeOrder);
+  }
+
+  private writeTruncationMarker(encoder: DirectionalIndexByteEncoder): void {
+    // While the SDK does not implement truncation, the truncation marker is
+    // used to terminate all variable length values (which are strings, bytes,
+    // references, arrays and maps).
+    encoder.writeNumber(NOT_TRUNCATED);
+  }
+}

packages/firestore/src/index/index_byte_encoder.ts

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+/**
+ * @license
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { ByteString } from '../util/byte_string';
+
+import { DirectionalIndexByteEncoder } from './directional_index_byte_encoder';
+import { OrderedCodeWriter } from './ordered_code_writer';
+
+class AscendingIndexByteEncoder implements DirectionalIndexByteEncoder {
+  constructor(private orderedCode: OrderedCodeWriter) {}
+  writeBytes(value: ByteString): void {
+    this.orderedCode.writeBytesAscending(value);
+  }
+
+  writeString(value: string): void {
+    this.orderedCode.writeUtf8Ascending(value);
+  }
+
+  writeNumber(value: number): void {
+    this.orderedCode.writeNumberAscending(value);
+  }
+
+  writeInfinity(): void {
+    this.orderedCode.writeInfinityAscending();
+  }
+}
+
+class DescendingIndexByteEncoder implements DirectionalIndexByteEncoder {
+  constructor(private orderedCode: OrderedCodeWriter) {}
+  writeBytes(value: ByteString): void {
+    this.orderedCode.writeBytesDescending(value);
+  }
+
+  writeString(value: string): void {
+    this.orderedCode.writeUtf8Descending(value);
+  }
+
+  writeNumber(value: number): void {
+    this.orderedCode.writeNumberDescending(value);
+  }
+
+  writeInfinity(): void {
+    this.orderedCode.writeInfinityDescending();
+  }
+}
+/**
+ * Implements `DirectionalIndexByteEncoder` using `OrderedCodeWriter` for the
+ * actual encoding.
+ */
+export class IndexByteEncoder {
+  private orderedCode = new OrderedCodeWriter();
+  private ascending = new AscendingIndexByteEncoder(this.orderedCode);
+  private descending = new DescendingIndexByteEncoder(this.orderedCode);
+
+  seed(encodedBytes: Uint8Array): void {
+    this.orderedCode.seed(encodedBytes);
+  }
+
+  forKind(kind: 'asc' | 'desc'): DirectionalIndexByteEncoder {
+    return kind === 'asc' ? this.ascending : this.descending;
+  }
+
+  encodedBytes(): Uint8Array {
+    return this.orderedCode.encodedBytes();
+  }
+
+  reset(): void {
+    this.orderedCode.reset();
+  }
+}

packages/firestore/src/index/ordered_code_writer.ts

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+/**
+ * @license
+ * Copyright 2021 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law | agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES | CONDITIONS OF ANY KIND, either express | implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { fail } from '../util/assert';
+import { ByteString } from '../util/byte_string';
+
+export class OrderedCodeWriter {
+  writeBytesAscending(value: ByteString): void {
+    fail('Not implemented');
+  }
+
+  writeBytesDescending(value: ByteString): void {
+    fail('Not implemented');
+  }
+
+  writeUtf8Ascending(sequence: string): void {
+    fail('Not implemented');
+  }
+
+  writeUtf8Descending(sequence: string): void {
+    fail('Not implemented');
+  }
+
+  writeNumberAscending(val: number): void {
+    fail('Not implemented');
+  }
+
+  writeNumberDescending(val: number): void {
+    fail('Not implemented');
+  }
+
+  writeInfinityAscending(): void {
+    fail('Not implemented');
+  }
+
+  writeInfinityDescending(): void {
+    fail('Not implemented');
+  }
+
+  reset(): void {
+    fail('Not implemented');
+  }
+
+  encodedBytes(): Uint8Array {
+    fail('Not implemented');
+  }
+
+  seed(encodedBytes: Uint8Array): void {
+    fail('Not implemented');
+  }
+}