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* Resource service.
* @packageDocumentation
*/
import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { DBService } from '../db/db.service';
import { NBResource, ResourceMap } from './resource.interface';
import { ServiceException } from '../service.exception';
/**
* Resource table name.
*/
export const resourceTableName = 'NB_RESOURCE';
/**
* Resource table service.
*/
@Injectable()
export class ResourceService {
constructor(
@Inject(forwardRef(() => DBService))
private readonly dbService: DBService,
) {}
/**
* Determine whether or not an app resource exists.
*
* @param name The name of the resource.
* @returns Whether or not the resource exists.
*/
public async resourceExists(name: string): Promise<boolean> {
const resource = await this.dbService.getByFields<
NBResource<boolean | number | string>
>(resourceTableName, { name });
return !!resource;
}
/**
* Get an app resource.
*
* @param name The name of the resource.
* @returns The value of the requested resource.
*/
public async getResource<T extends boolean | number | string>(
name: string,
): Promise<T> {
const resource = await this.dbService.getByFields<NBResource<T>>(
resourceTableName,
{ name },
);
if (resource) {
switch (resource.type) {
case 'BOOLEAN':
switch (resource.value) {
case 'true':
return true as T;
case 'false':
return false as T;
default:
throw new ServiceException('Failed to parse resource to boolean');
}
case 'NUMBER':
const value = parseFloat(resource.value as string);
Eif (!isNaN(value)) {
return value as T;
} else {
throw new ServiceException('Failed to parse resource to number');
}
case 'STRING':
return resource.value as T;
default:
throw new ServiceException('Invalid resource type');
}
} else {
throw new ServiceException('Resource does not exist');
}
}
/**
* Set an app resource's value.
*
* @param name The name of the resource.
* @param value The new value of the resource.
* @returns The updated resource record.
*/
public async setResource<T extends boolean | number | string>(
name: string,
value: T,
): Promise<NBResource<T>> {
const resource = await this.dbService.getByFields<NBResource<T>>(
resourceTableName,
{ name },
);
if (resource) {
switch (resource.type) {
case 'BOOLEAN':
Iif (
typeof value !== 'boolean' &&
value !== 'true' &&
value !== 'false'
) {
throw new ServiceException('Resource type must be boolean');
}
break;
case 'NUMBER':
const numberValue = parseFloat(value.toString());
if (typeof value !== 'number' && isNaN(numberValue)) {
throw new ServiceException('Resource type must be number');
}
break;
}
const resources = await this.dbService.updateByFields<NBResource<T>>(
resourceTableName,
{ name },
{ value: value.toString() },
);
switch (resources[0].type) {
case 'BOOLEAN':
return {
...resources[0],
value: (resources[0].value === 'true' ? true : false) as T,
};
case 'NUMBER':
return {
...resources[0],
value: parseFloat(resources[0].value as string) as T,
};
case 'STRING':
return resources[0];
}
} else {
throw new ServiceException('Resource does not exist');
}
}
/**
* Reset an app resource's value.
*
* @param name The name of the resource.
* @returns The updated resource record.
*/
public async resetResource<T extends boolean | number | string>(
name: string,
): Promise<NBResource<T>> {
const resourceArray = await this.dbService.getStaticTable(
resourceTableName,
);
const defaultResources = resourceArray.reduce((acc, resource) => {
switch (resource.type) {
case 'BOOLEAN':
acc[resource.name] = resource.value === 'true' ? true : false;
break;
case 'NUMBER':
acc[resource.name] = parseFloat(resource.value as string);
break;
case 'STRING':
acc[resource.name] = resource.value;
break;
}
return acc;
}, {});
return this.setResource<T>(name, defaultResources[name]);
}
/**
* Get all app resources.
*
* @returns All resources.
*/
public async getResources(): Promise<ResourceMap> {
const resources = await this.dbService.list<
NBResource<boolean | number | string>
>(resourceTableName, { fieldName: 'name', sortOrder: 'ASC' });
return resources.reduce((acc, resource) => {
switch (resource.type) {
case 'BOOLEAN':
acc[resource.name] = {
value: resource.value === 'true' ? true : false,
type: resource.type,
};
break;
case 'NUMBER':
acc[resource.name] = {
value: parseFloat(resource.value as string),
type: resource.type,
};
break;
case 'STRING':
acc[resource.name] = { value: resource.value, type: resource.type };
break;
}
return acc;
}, {});
}
}
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