@decaf-ts/db-decorators
Version:
Agnostic database decorators and repository
175 lines • 27.1 kB
JavaScript
import { Operations } from "./../operations/Operations.js";
import { OperationKeys } from "./../operations/constants.js";
import { Reflection } from "@decaf-ts/reflection";
import { InternalError } from "./errors.js";
import { ModelKeys } from "@decaf-ts/decorator-validation";
/**
* @summary retrieves the arguments for the handler
* @param {any} dec the decorator
* @param {string} prop the property name
* @param {{}} m the model
* @param {{}} [accum] accumulator used for internal recursiveness
*
* @function getHandlerArgs
* @memberOf module:db-decorators.Repository
*/
export const getHandlerArgs = function (dec, prop, m, accum) {
const name = m.constructor.name;
if (!name)
throw new InternalError("Could not determine model class");
accum = accum || {};
if (dec.props.handlers[name] && dec.props.handlers[name][prop])
accum = { ...dec.props.handlers[name][prop], ...accum };
let proto = Object.getPrototypeOf(m);
if (proto === Object.prototype)
return accum;
if (proto.constructor.name === name)
proto = Object.getPrototypeOf(proto);
return getHandlerArgs(dec, prop, proto, accum);
};
/**
*
* @param {IRepository<T>} repo
* @param context
* @param {T} model
* @param operation
* @param prefix
*
* @param oldModel
* @function enforceDBPropertyDecoratorsAsync
*
* @memberOf db-decorators.utils
*/
export async function enforceDBDecorators(repo, context, model, operation, prefix, oldModel) {
const decorators = getDbDecorators(model, operation, prefix);
if (!decorators)
return;
for (const prop in decorators) {
const decs = decorators[prop];
for (const dec of decs) {
const { key } = dec;
const handlers = Operations.get(model, prop, prefix + key);
if (!handlers || !handlers.length)
throw new InternalError(`Could not find registered handler for the operation ${prefix + key} under property ${prop}`);
const handlerArgs = getHandlerArgs(dec, prop, model);
if (!handlerArgs || Object.values(handlerArgs).length !== handlers.length)
throw new InternalError("Args and handlers length do not match");
let handler;
let data;
for (let i = 0; i < handlers.length; i++) {
handler = handlers[i];
data = Object.values(handlerArgs)[i];
const args = [context, data.data, prop, model];
if (operation === OperationKeys.UPDATE && prefix === OperationKeys.ON) {
if (!oldModel)
throw new InternalError("Missing old model for update operation");
args.push(oldModel);
}
try {
await handler.apply(repo, args);
}
catch (e) {
const msg = `Failed to execute handler ${handler.name} for ${prop} on ${model.constructor.name} due to error: ${e}`;
if (context.get("breakOnHandlerError"))
throw new InternalError(msg);
console.log(msg);
}
}
}
}
}
/**
* Specific for DB Decorators
* @param {T} model
* @param {string} operation CRUD {@link OperationKeys}
* @param {string} [extraPrefix]
*
* @function getDbPropertyDecorators
*
* @memberOf db-decorators.utils
*/
export function getDbDecorators(model, operation, extraPrefix) {
const decorators = Reflection.getAllPropertyDecorators(model,
// undefined,
OperationKeys.REFLECT + (extraPrefix ? extraPrefix : ""));
if (!decorators)
return;
return Object.keys(decorators).reduce((accum, decorator) => {
const dec = decorators[decorator].filter((d) => d.key === operation);
if (dec && dec.length) {
if (!accum)
accum = {};
accum[decorator] = dec;
}
return accum;
}, undefined);
}
/**
* @summary Retrieves the decorators for an object's properties prefixed by {@param prefixes} recursively
* @param model
* @param accum
* @param prefixes
*
* @function getAllPropertyDecoratorsRecursive
* @memberOf module:db-decorators.Repository
*/
export const getAllPropertyDecoratorsRecursive = function (model, accum, ...prefixes) {
const accumulator = accum || {};
const mergeDecorators = function (decs) {
const pushOrSquash = (key, ...values) => {
values.forEach((val) => {
let match;
if (!(match = accumulator[key].find((e) => e.key === val.key)) ||
match.props.operation !== val.props.operation) {
accumulator[key].push(val);
return;
}
if (val.key === ModelKeys.TYPE)
return;
const { handlers, operation } = val.props;
if (!operation ||
!operation.match(new RegExp(`^(:?${OperationKeys.ON}|${OperationKeys.AFTER})(:?${OperationKeys.CREATE}|${OperationKeys.READ}|${OperationKeys.UPDATE}|${OperationKeys.DELETE})$`))) {
accumulator[key].push(val);
return;
}
const accumHandlers = match.props.handlers;
Object.entries(handlers).forEach(([clazz, handlerDef]) => {
if (!(clazz in accumHandlers)) {
accumHandlers[clazz] = handlerDef;
return;
}
Object.entries(handlerDef).forEach(([handlerProp, handler]) => {
if (!(handlerProp in accumHandlers[clazz])) {
accumHandlers[clazz][handlerProp] = handler;
return;
}
Object.entries(handler).forEach(([handlerKey, argsObj]) => {
if (!(handlerKey in accumHandlers[clazz][handlerProp])) {
accumHandlers[clazz][handlerProp][handlerKey] = argsObj;
return;
}
console.warn(`Skipping handler registration for ${clazz} under prop ${handlerProp} because handler is the same`);
});
});
});
});
};
Object.entries(decs).forEach(([key, value]) => {
accumulator[key] = accumulator[key] || [];
pushOrSquash(key, ...value);
});
};
const decs = Reflection.getAllPropertyDecorators(model, ...prefixes);
if (decs)
mergeDecorators(decs);
if (Object.getPrototypeOf(model) === Object.prototype)
return accumulator;
// const name = model.constructor.name;
const proto = Object.getPrototypeOf(model);
if (!proto)
return accumulator;
// if (proto.constructor && proto.constructor.name === name)
// proto = Object.getPrototypeOf(proto)
return getAllPropertyDecoratorsRecursive(proto, accumulator, ...prefixes);
};
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{ Operations } from \"../operations/Operations\";\nimport { OperationHandler, UpdateOperationHandler } from \"../operations/types\";\nimport { IRepository } from \"../interfaces/IRepository\";\nimport { OperationKeys } from \"../operations/constants\";\nimport { DecoratorMetadata, Reflection } from \"@decaf-ts/reflection\";\nimport { InternalError } from \"./errors\";\nimport { Constructor, Model, ModelKeys } from \"@decaf-ts/decorator-validation\";\nimport { Context } from \"./Context\";\nimport { RepositoryFlags } from \"./types\";\n\n/**\n * @description Context arguments for repository operations.\n * @summary Represents the context and arguments for repository operations.\n * This type is used to pass context and arguments between repository methods.\n * @template F - The repository flags type, defaults to RepositoryFlags\n * @template C - The context type, defaults to Context<F>\n * @typedef {Object} ContextArgs\n * @property {C} context - The operation context\n * @property {any[]} args - The operation arguments\n * @memberOf module:db-decorators\n */\nexport type ContextArgs<\n  F extends RepositoryFlags = RepositoryFlags,\n  C extends Context<F> = Context<F>,\n> = {\n  context: C;\n  args: any[];\n};\n\n/**\n * @summary retrieves the arguments for the handler\n * @param {any} dec the decorator\n * @param {string} prop the property name\n * @param {{}} m the model\n * @param {{}} [accum] accumulator used for internal recursiveness\n *\n * @function getHandlerArgs\n * @memberOf module:db-decorators.Repository\n */\nexport const getHandlerArgs = function (\n  dec: any,\n  prop: string,\n  m: Constructor<any>,\n  accum?: Record<string, { args: string[] }>\n): Record<string, { args: string[] }> | void {\n  const name = m.constructor.name;\n  if (!name) throw new InternalError(\"Could not determine model class\");\n  accum = accum || {};\n\n  if (dec.props.handlers[name] && dec.props.handlers[name][prop])\n    accum = { ...dec.props.handlers[name][prop], ...accum };\n\n  let proto = Object.getPrototypeOf(m);\n  if (proto === Object.prototype) return accum;\n  if (proto.constructor.name === name) proto = Object.getPrototypeOf(proto);\n\n  return getHandlerArgs(dec, prop, proto, accum);\n};\n\n/**\n *\n * @param {IRepository<T>} repo\n * @param context\n * @param {T} model\n * @param operation\n * @param prefix\n *\n * @param oldModel\n * @function enforceDBPropertyDecoratorsAsync\n *\n * @memberOf db-decorators.utils\n */\nexport async function enforceDBDecorators<\n  M extends Model,\n  R extends IRepository<M, F, C>,\n  V extends object = object,\n  F extends RepositoryFlags = RepositoryFlags,\n  C extends Context<F> = Context<F>,\n>(\n  repo: R,\n  context: C,\n  model: M,\n  operation: string,\n  prefix: string,\n  oldModel?: M\n): Promise<void> {\n  const decorators: Record<string, DecoratorMetadata[]> | undefined =\n    getDbDecorators(model, operation, prefix);\n\n  if (!decorators) return;\n\n  for (const prop in decorators) {\n    const decs: DecoratorMetadata[] = decorators[prop];\n    for (const dec of decs) {\n      const { key } = dec;\n      const handlers: OperationHandler<M, R, V, F, C>[] | undefined =\n        Operations.get<M, R, V, F, C>(model, prop, prefix + key);\n      if (!handlers || !handlers.length)\n        throw new InternalError(\n          `Could not find registered handler for the operation ${prefix + key} under property ${prop}`\n        );\n\n      const handlerArgs = getHandlerArgs(dec, prop, model as any);\n\n      if (!handlerArgs || Object.values(handlerArgs).length !== handlers.length)\n        throw new InternalError(\"Args and handlers length do not match\");\n\n      let handler: OperationHandler<M, R, V, F, C>;\n      let data: any;\n      for (let i = 0; i < handlers.length; i++) {\n        handler = handlers[i];\n        data = Object.values(handlerArgs)[i];\n\n        const args: any[] = [context, data.data, prop, model];\n\n        if (operation === OperationKeys.UPDATE && prefix === OperationKeys.ON) {\n          if (!oldModel)\n            throw new InternalError(\"Missing old model for update operation\");\n          args.push(oldModel);\n        }\n        try {\n          await (handler as UpdateOperationHandler<M, R, V, F, C>).apply(\n            repo,\n            args as [C, V, keyof M, M, M]\n          );\n        } catch (e: unknown) {\n          const msg = `Failed to execute handler ${handler.name} for ${prop} on ${model.constructor.name} due to error: ${e}`;\n          if (context.get(\"breakOnHandlerError\")) throw new InternalError(msg);\n          console.log(msg);\n        }\n      }\n    }\n  }\n}\n\n/**\n * Specific for DB Decorators\n * @param {T} model\n * @param {string} operation CRUD {@link OperationKeys}\n * @param {string} [extraPrefix]\n *\n * @function getDbPropertyDecorators\n *\n * @memberOf db-decorators.utils\n */\nexport function getDbDecorators<T extends Model>(\n  model: T,\n  operation: string,\n  extraPrefix?: string\n): Record<string, DecoratorMetadata[]> | undefined {\n  const decorators: Record<string, DecoratorMetadata[]> | undefined =\n    Reflection.getAllPropertyDecorators(\n      model,\n      // undefined,\n      OperationKeys.REFLECT + (extraPrefix ? extraPrefix : \"\")\n    );\n  if (!decorators) return;\n  return Object.keys(decorators).reduce(\n    (accum: Record<string, DecoratorMetadata[]> | undefined, decorator) => {\n      const dec = decorators[decorator].filter((d) => d.key === operation);\n      if (dec && dec.length) {\n        if (!accum) accum = {};\n        accum[decorator] = dec;\n      }\n      return accum;\n    },\n    undefined\n  );\n}\n\n/**\n * @summary Retrieves the decorators for an object's properties prefixed by {@param prefixes} recursively\n * @param model\n * @param accum\n * @param prefixes\n *\n * @function getAllPropertyDecoratorsRecursive\n * @memberOf module:db-decorators.Repository\n */\nexport const getAllPropertyDecoratorsRecursive = function <T extends Model>(\n  model: T,\n  accum: { [indexer: string]: any[] } | undefined,\n  ...prefixes: string[]\n): { [indexer: string]: any[] } | undefined {\n  const accumulator = accum || {};\n  const mergeDecorators = function (decs: { [indexer: string]: any[] }) {\n    const pushOrSquash = (key: string, ...values: any[]) => {\n      values.forEach((val) => {\n        let match: any;\n        if (\n          !(match = accumulator[key].find((e) => e.key === val.key)) ||\n          match.props.operation !== val.props.operation\n        ) {\n          accumulator[key].push(val);\n          return;\n        }\n\n        if (val.key === ModelKeys.TYPE) return;\n\n        const { handlers, operation } = val.props;\n\n        if (\n          !operation ||\n          !operation.match(\n            new RegExp(\n              `^(:?${OperationKeys.ON}|${OperationKeys.AFTER})(:?${OperationKeys.CREATE}|${OperationKeys.READ}|${OperationKeys.UPDATE}|${OperationKeys.DELETE})$`\n            )\n          )\n        ) {\n          accumulator[key].push(val);\n          return;\n        }\n\n        const accumHandlers = match.props.handlers;\n\n        Object.entries(handlers).forEach(([clazz, handlerDef]) => {\n          if (!(clazz in accumHandlers)) {\n            accumHandlers[clazz] = handlerDef;\n            return;\n          }\n\n          Object.entries(handlerDef as object).forEach(\n            ([handlerProp, handler]) => {\n              if (!(handlerProp in accumHandlers[clazz])) {\n                accumHandlers[clazz][handlerProp] = handler;\n                return;\n              }\n\n              Object.entries(handler as object).forEach(\n                ([handlerKey, argsObj]) => {\n                  if (!(handlerKey in accumHandlers[clazz][handlerProp])) {\n                    accumHandlers[clazz][handlerProp][handlerKey] = argsObj;\n                    return;\n                  }\n                  console.warn(\n                    `Skipping handler registration for ${clazz} under prop ${handlerProp} because handler is the same`\n                  );\n                }\n              );\n            }\n          );\n        });\n      });\n    };\n\n    Object.entries(decs).forEach(([key, value]) => {\n      accumulator[key] = accumulator[key] || [];\n      pushOrSquash(key, ...value);\n    });\n  };\n\n  const decs: { [indexer: string]: any[] } | undefined =\n    Reflection.getAllPropertyDecorators(model, ...prefixes);\n  if (decs) mergeDecorators(decs);\n\n  if (Object.getPrototypeOf(model) === Object.prototype) return accumulator;\n\n  // const name = model.constructor.name;\n  const proto = Object.getPrototypeOf(model);\n  if (!proto) return accumulator;\n  // if (proto.constructor && proto.constructor.name === name)\n  //     proto = Object.getPrototypeOf(proto)\n  return getAllPropertyDecoratorsRecursive(proto, accumulator, ...prefixes);\n};\n"]}