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1
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import { logger } from '@/core'; |
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2
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import { ExpressBean } from '@/ExpressBeansTypes'; |
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3
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4
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function getSingleton<T>(singletonClass: T & ExpressBean): T & ExpressBean { |
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5
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if (singletonClass) { |
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6
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if (singletonClass._instance) { |
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return singletonClass._instance; |
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8
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} |
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9
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const className = Reflect.getOwnPropertyDescriptor(singletonClass, 'name')?.value; |
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10
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if (!className) { |
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11
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throw new Error(`Cannot get instance for a class without name: ${JSON.stringify(singletonClass)}`); |
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12
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} |
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13
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throw new Error(`Cannot get instance from ${className}. Make sure that ${className} has @Bean as class decorator`); |
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14
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} |
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15
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16
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if (!hasName(singletonClass)) { |
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throw new Error(`Cannot get instance for ${JSON.stringify(singletonClass)}: it is not an ExpressBean`); |
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18
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} |
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19
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if (!isABean(singletonClass)) { |
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const className = (singletonClass as any).name; |
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throw new Error(`Cannot get instance from ${className}. Make sure that ${className} has @Bean as class decorator`); |
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} |
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const bean = singletonClass as unknown as ExpressBean; |
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return bean._instance; |
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} |
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/** |
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* Gets singleton instance by its static property |
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* @decorator |
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* @param singletonClass |
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*/ |
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export function InjectBean<T extends object>(singletonClass: NonNullable<T>) { |
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return (_value: unknown, _context: ClassFieldDecoratorContext) => () => new Proxy<T>( |
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36
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singletonClass ?? {}, |
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{ |
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get: (target, property) => { |
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if (property === '_beanUUID' || property === '_className') { |
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return (target as ExpressBean)[property]; |
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41
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} |
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const singletonInstance = getSingleton(singletonClass); |
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const className = (singletonInstance as unknown as ExpressBean)._className; |
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logger.debug(`proxying ${className}.${String(property)}`); |
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return (singletonInstance as any)[property]; |
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46
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}, |
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47
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}, |
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48
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) as any; |
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} |
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spaghiajoeojo /
express-beans
