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EntityComparator.ts
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EntityComparator.ts
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import clone from 'clone';
import { AnyEntity, EntityData, EntityMetadata, EntityProperty, IMetadataStorage, Primary } from '../typings';
import { ReferenceType } from '../enums';
import { Platform } from '../platforms';
import { compareArrays, compareBuffers, compareObjects, equals, Utils } from './Utils';
type Comparator<T> = (a: T, b: T) => EntityData<T>;
type ResultMapper<T> = (result: EntityData<T>) => EntityData<T> | null;
type SnapshotGenerator<T> = (entity: T) => EntityData<T>;
type PkGetter<T> = (entity: T) => Primary<T>;
type PkSerializer<T> = (entity: T) => string;
export class EntityComparator {
private readonly comparators = new Map<string, Comparator<any>>();
private readonly mappers = new Map<string, ResultMapper<any>>();
private readonly snapshotGenerators = new Map<string, SnapshotGenerator<any>>();
private readonly pkGetters = new Map<string, PkGetter<any>>();
private readonly pkSerializers = new Map<string, PkSerializer<any>>();
constructor(private readonly metadata: IMetadataStorage,
private readonly platform: Platform) { }
/**
* Computes difference between two entities.
*/
diffEntities<T extends EntityData<T>>(entityName: string, a: T, b: T): EntityData<T> {
const comparator = this.getEntityComparator<T>(entityName);
return Utils.callCompiledFunction(comparator, a, b);
}
/**
* Removes ORM specific code from entities and prepares it for serializing. Used before change set computation.
* References will be mapped to primary keys, collections to arrays of primary keys.
*/
prepareEntity<T extends AnyEntity<T>>(entity: T): EntityData<T> {
const generator = this.getSnapshotGenerator<T>(entity.constructor.name);
return Utils.callCompiledFunction(generator, entity);
}
/**
* Maps database columns to properties.
*/
mapResult<T extends AnyEntity<T>>(entityName: string, result: EntityData<T>): EntityData<T> | null {
const mapper = this.getResultMapper<T>(entityName);
return Utils.callCompiledFunction(mapper, result);
}
/**
* @internal Highly performance-sensitive method.
*/
getPkGetter<T extends AnyEntity<T>>(meta: EntityMetadata<T>) {
const exists = this.pkGetters.get(meta.className);
if (exists) {
return exists;
}
const lines: string[] = [];
const context = new Map<string, any>();
if (meta.primaryKeys.length > 1) {
lines.push(` const cond = {`);
meta.primaryKeys.forEach(pk => {
if (meta.properties[pk].reference !== ReferenceType.SCALAR) {
lines.push(` ${pk}: (entity.${pk} != null && (entity.${pk}.__entity || entity.${pk}.__reference)) ? entity.${pk}.__helper.getPrimaryKey() : entity.${pk},`);
} else {
lines.push(` ${pk}: entity.${pk},`);
}
});
lines.push(` };`);
lines.push(` if (${meta.primaryKeys.map(pk => `cond.${pk} == null`).join(' || ')}) return null;`);
lines.push(` return cond;`);
} else {
const pk = meta.primaryKeys[0];
if (meta.properties[pk].reference !== ReferenceType.SCALAR) {
lines.push(` if (entity.${pk} != null && (entity.${pk}.__entity || entity.${pk}.__reference)) return entity.${pk}.__helper.getPrimaryKey();`);
}
lines.push(` return entity.${pk};`);
}
const code = `return function(entity) {\n${lines.join('\n')}\n}`;
const pkSerializer = Utils.createFunction(context, code);
this.pkGetters.set(meta.className, pkSerializer);
return pkSerializer;
}
/**
* @internal Highly performance-sensitive method.
*/
getPkSerializer<T extends AnyEntity<T>>(meta: EntityMetadata<T>) {
const exists = this.pkSerializers.get(meta.className);
if (exists) {
return exists;
}
const lines: string[] = [];
const context = new Map<string, any>();
if (meta.primaryKeys.length > 1) {
lines.push(` const pks = [`);
meta.primaryKeys.forEach(pk => {
if (meta.properties[pk].reference !== ReferenceType.SCALAR) {
lines.push(` (entity.${pk} != null && (entity.${pk}.__entity || entity.${pk}.__reference)) ? entity.${pk}.__helper.getSerializedPrimaryKey() : entity.${pk},`);
} else {
lines.push(` entity.${pk},`);
}
});
lines.push(` ];`);
lines.push(` return pks.join('${Utils.PK_SEPARATOR}');`);
} else {
const pk = meta.primaryKeys[0];
if (meta.properties[pk].reference !== ReferenceType.SCALAR) {
lines.push(` if (entity.${pk} != null && (entity.${pk}.__entity || entity.${pk}.__reference)) return entity.${pk}.__helper.getSerializedPrimaryKey();`);
}
lines.push(` return '' + entity.${meta.serializedPrimaryKey};`);
}
const code = `return function(entity) {\n${lines.join('\n')}\n}`;
const pkSerializer = Utils.createFunction(context, code);
this.pkSerializers.set(meta.className, pkSerializer);
return pkSerializer;
}
/**
* @internal Highly performance-sensitive method.
*/
getSnapshotGenerator<T extends AnyEntity<T>>(entityName: string): SnapshotGenerator<T> {
const exists = this.snapshotGenerators.get(entityName);
if (exists) {
return exists;
}
const meta = this.metadata.find<T>(entityName)!;
const lines: string[] = [];
const context = new Map<string, any>();
context.set('clone', clone);
context.set('cloneEmbeddable', (o: any) => this.platform.cloneEmbeddable(o)); // do not clone prototypes
if (meta.discriminatorValue) {
lines.push(` ret.${meta.root.discriminatorColumn} = '${meta.discriminatorValue}'`);
}
const getRootProperty: (prop: EntityProperty) => EntityProperty = (prop: EntityProperty) => prop.embedded ? getRootProperty(meta.properties[prop.embedded[0]]) : prop;
// copy all comparable props, ignore collections and references, process custom types
meta.comparableProps
.filter(prop => {
const root = getRootProperty(prop);
return prop === root || root.reference !== ReferenceType.EMBEDDED;
})
.forEach(prop => lines.push(this.getPropertySnapshot(meta, prop, context)));
const code = `return function(entity) {\n const ret = {};\n${lines.join('\n')}\n return ret;\n}`;
const snapshotGenerator = Utils.createFunction(context, code);
this.snapshotGenerators.set(entityName, snapshotGenerator);
return snapshotGenerator;
}
/**
* @internal Highly performance-sensitive method.
*/
getResultMapper<T extends AnyEntity<T>>(entityName: string): ResultMapper<T> {
const exists = this.mappers.get(entityName);
if (exists) {
return exists;
}
const meta = this.metadata.get<T>(entityName)!;
const lines: string[] = [];
const context = new Map<string, any>();
lines.push(` const mapped = {};`);
meta.props.forEach(prop => {
if (prop.fieldNames) {
if (prop.fieldNames.length > 1) {
lines.push(` if (${prop.fieldNames.map(field => `result.${field} != null`).join(' && ')}) {\n ret.${prop.name} = [${prop.fieldNames.map(field => `result.${field}`).join(', ')}];`);
lines.push(...prop.fieldNames.map(field => ` mapped.${field} = true;`));
lines.push(` } else if (${prop.fieldNames.map(field => `result.${field} == null`).join(' && ')}) {\n ret.${prop.name} = null;`);
lines.push(...prop.fieldNames.map(field => ` mapped.${field} = true;`), ' }');
} else {
if (prop.type === 'boolean') {
lines.push(` if ('${prop.fieldNames[0]}' in result) { ret.${prop.name} = result.${prop.fieldNames[0]} == null ? result.${prop.fieldNames[0]} : !!result.${prop.fieldNames[0]}; mapped.${prop.fieldNames[0]} = true; }`);
} else {
lines.push(` if ('${prop.fieldNames[0]}' in result) { ret.${prop.name} = result.${prop.fieldNames[0]}; mapped.${prop.fieldNames[0]} = true; }`);
}
}
}
});
lines.push(` for (let k in result) { if (result.hasOwnProperty(k) && !mapped[k]) ret[k] = result[k]; }`);
const code = `return function(result) {\n const ret = {};\n${lines.join('\n')}\n return ret;\n}`;
const snapshotGenerator = Utils.createFunction(context, code);
this.mappers.set(entityName, snapshotGenerator);
return snapshotGenerator;
}
private getPropertyCondition<T>(prop: EntityProperty<T>): string {
let ret = `'${prop.name}' in entity`;
const isRef = [ReferenceType.ONE_TO_ONE, ReferenceType.MANY_TO_ONE].includes(prop.reference) && !prop.mapToPk;
const isSetter = isRef && !!(prop.inversedBy || prop.mappedBy);
if (prop.primary || isSetter) {
ret += ` && entity.${prop.name} != null`;
}
if (isRef) {
ret += ` && (entity.${prop.name} == null || entity.${prop.name}.__helper.hasPrimaryKey())`;
}
return ret;
}
private getEmbeddedArrayPropertySnapshot<T>(meta: EntityMetadata<T>, prop: EntityProperty<T>, context: Map<string, any>, level: number, path: string[] = [prop.name], dataKey?: string, object?: boolean, serialize?: boolean): string {
const entityKey = path.join('.');
dataKey = dataKey ?? entityKey;
const ret: string[] = [];
const padding = ' '.repeat(level * 2);
ret.push(`${padding}if (Array.isArray(entity.${entityKey})) {`);
ret.push(`${padding} ret.${dataKey} = [];`);
ret.push(`${padding} entity.${entityKey}.forEach((_, idx) => {`);
const last = path.pop();
ret.push(this.getEmbeddedPropertySnapshot(meta, prop, context, level + 2, [...path, last + '[idx]'], dataKey + '[idx]', true));
ret.push(`${padding} });`);
if (this.shouldSerialize(prop, dataKey)) {
ret.push(`${padding} ret.${dataKey} = cloneEmbeddable(ret.${dataKey});`);
}
ret.push(`${padding}}`);
return ret.join('\n');
}
/**
* we need to serialize only object embeddables, and only the top level ones, so root object embeddable
* properties and first child nested object embeddables with inlined parent
*/
private shouldSerialize(prop: EntityProperty, dataKey: string): boolean {
const contains = (str: string, re: RegExp) => (str.match(re) || []).length > 0;
const a = contains(dataKey, /\./g);
const b = contains(dataKey, /\[/g);
return !!prop.object && !(a || b);
}
private getEmbeddedPropertySnapshot<T>(meta: EntityMetadata<T>, prop: EntityProperty<T>, context: Map<string, any>, level: number, path: string[] = [prop.name], dataKey?: string, object = prop.object): string {
const entityKey = path.join('.');
dataKey = dataKey ?? (object ? entityKey : prop.name);
const padding = ' '.repeat(level * 2);
const cond = `entity.${path.join('.')} != null`;
let ret = `${level === 1 ? '' : '\n'}${padding}if (${cond}) {\n`;
if (object) {
ret += `${padding} ret.${dataKey} = {};\n`;
}
ret += meta.props.filter(p => p.embedded?.[0] === prop.name).map(childProp => {
const childDataKey = prop.object ? dataKey + '.' + childProp.embedded![1] : childProp.name;
if (childProp.reference === ReferenceType.EMBEDDED) {
return this.getPropertySnapshot(meta, childProp, context, childDataKey, [...path, childProp.embedded![1]], level + 1, prop.object);
}
const childEntityKey = `${path.join('.')}.${childProp.embedded![1]}`;
if (childProp.customType) {
context.set(`convertToDatabaseValue_${childProp.name}`, (val: any) => childProp.customType.convertToDatabaseValue(val, this.platform));
/* istanbul ignore next */
if (['number', 'string', 'boolean'].includes(childProp.customType.compareAsType().toLowerCase())) {
return `${padding} ret.${childDataKey} = convertToDatabaseValue_${childProp.name}(entity.${childEntityKey});`;
}
return `${padding} ret.${childDataKey} = clone(convertToDatabaseValue_${childProp.name}(entity.${childEntityKey}));`;
}
return `${padding} ret.${childDataKey} = clone(entity.${childEntityKey});`;
}).join('\n') + `\n`;
if (this.shouldSerialize(prop, dataKey)) {
return `${ret + padding} ret.${dataKey} = cloneEmbeddable(ret.${dataKey});\n${padding}}`;
}
return `${ret}${padding}}`;
}
private getPropertySnapshot<T>(meta: EntityMetadata<T>, prop: EntityProperty<T>, context: Map<string, any>, dataKey?: string, path?: string[], level = 1, object?: boolean): string {
let ret = ` if (${this.getPropertyCondition(prop)}) {\n`;
if (['number', 'string', 'boolean'].includes(prop.type.toLowerCase())) {
return ret + ` ret.${prop.name} = entity.${prop.name};\n }\n`;
}
if (prop.reference === ReferenceType.EMBEDDED) {
if (prop.array) {
return this.getEmbeddedArrayPropertySnapshot(meta, prop, context, level, path, dataKey, true) + '\n';
}
return this.getEmbeddedPropertySnapshot(meta, prop, context, level, path, dataKey, object) + '\n';
}
if (prop.reference === ReferenceType.ONE_TO_ONE || prop.reference === ReferenceType.MANY_TO_ONE) {
context.set(`getPrimaryKeyValues_${prop.name}`, (val: any) => val && Utils.getPrimaryKeyValues(val, this.metadata.find(prop.type)!.primaryKeys, true));
ret += ` ret.${prop.name} = getPrimaryKeyValues_${prop.name}(entity.${prop.name});\n`;
if (prop.customType) {
context.set(`convertToDatabaseValue_${prop.name}`, (val: any) => prop.customType.convertToDatabaseValue(val, this.platform));
/* istanbul ignore next */
if (['number', 'string', 'boolean'].includes(prop.customType.compareAsType().toLowerCase())) {
return ret + ` ret.${prop.name} = convertToDatabaseValue_${prop.name}(ret.${prop.name});\n }\n`;
}
return ret + ` ret.${prop.name} = clone(convertToDatabaseValue_${prop.name}(ret.${prop.name}));\n }\n`;
}
return ret + ' }\n';
}
if (prop.customType) {
context.set(`convertToDatabaseValue_${prop.name}`, (val: any) => prop.customType.convertToDatabaseValue(val, this.platform));
if (['number', 'string', 'boolean'].includes(prop.customType.compareAsType().toLowerCase())) {
return ret + ` ret.${prop.name} = convertToDatabaseValue_${prop.name}(entity.${prop.name});\n }\n`;
}
return ret + ` ret.${prop.name} = clone(convertToDatabaseValue_${prop.name}(entity.${prop.name}));\n }\n`;
}
if (prop.type.toLowerCase() === 'date') {
context.set('processDateProperty', this.platform.processDateProperty.bind(this.platform));
return ret + ` ret.${prop.name} = clone(processDateProperty(entity.${prop.name}));\n }\n`;
}
return ret + ` ret.${prop.name} = clone(entity.${prop.name});\n }\n`;
}
/**
* @internal Highly performance-sensitive method.
*/
getEntityComparator<T>(entityName: string): Comparator<T> {
const exists = this.comparators.get(entityName);
if (exists) {
return exists;
}
const meta = this.metadata.find<T>(entityName)!;
const lines: string[] = [];
const context = new Map<string, any>();
context.set('compareArrays', compareArrays);
context.set('compareBuffers', compareBuffers);
context.set('compareObjects', compareObjects);
context.set('equals', equals);
meta.comparableProps.forEach(prop => {
lines.push(this.getPropertyComparator(prop));
});
const code = `return function(last, current) {\n const diff = {};\n${lines.join('\n')}\n return diff;\n}`;
const comparator = Utils.createFunction(context, code);
this.comparators.set(entityName, comparator);
return comparator;
}
private getGenericComparator(prop: string, cond: string): string {
return ` if (current.${prop} == null && last.${prop} == null) {\n\n` +
` } else if ((current.${prop} && last.${prop} == null) || (current.${prop} == null && last.${prop})) {\n` +
` diff.${prop} = current.${prop};\n` +
` } else if (${cond}) {\n` +
` diff.${prop} = current.${prop};\n` +
` }\n`;
}
private getPropertyComparator<T>(prop: EntityProperty<T>): string {
let type = prop.type.toLowerCase();
if (prop.reference !== ReferenceType.SCALAR && prop.reference !== ReferenceType.EMBEDDED) {
const meta2 = this.metadata.find(prop.type)!;
if (meta2.primaryKeys.length > 1) {
type = 'array';
} else {
type = meta2.properties[meta2.primaryKeys[0]].type.toLowerCase();
}
}
if (prop.customType) {
type = prop.customType.compareAsType();
}
if (['string', 'number', 'boolean'].includes(type)) {
return this.getGenericComparator(prop.name, `last.${prop.name} !== current.${prop.name}`);
}
if (['array'].includes(type) || type.endsWith('[]')) {
return this.getGenericComparator(prop.name, `!compareArrays(last.${prop.name}, current.${prop.name})`);
}
if (['buffer', 'uint8array'].includes(type)) {
return this.getGenericComparator(prop.name, `!compareBuffers(last.${prop.name}, current.${prop.name})`);
}
if (['date'].includes(type)) {
return this.getGenericComparator(prop.name, `last.${prop.name}.valueOf() !== current.${prop.name}.valueOf()`);
}
if (['objectid'].includes(type)) {
const cond = `last.${prop.name}.toHexString() !== current.${prop.name}.toHexString()`;
return this.getGenericComparator(prop.name, cond);
}
return ` if (!equals(last.${prop.name}, current.${prop.name})) diff.${prop.name} = current.${prop.name};`;
}
/**
* perf: used to generate list of comparable properties during discovery, so we speed up the runtime comparison
*/
static isComparable<T extends AnyEntity<T>>(prop: EntityProperty<T>, root: EntityMetadata) {
const virtual = prop.persist === false;
const inverse = prop.reference === ReferenceType.ONE_TO_ONE && !prop.owner;
const discriminator = prop.name === root.discriminatorColumn;
const collection = prop.reference === ReferenceType.ONE_TO_MANY || prop.reference === ReferenceType.MANY_TO_MANY;
return !virtual && !collection && !inverse && !discriminator && !prop.version;
}
}