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* Admin service.
* @packageDocumentation
*/
import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { DBService } from '../db/db.service';
import { ReportService } from '../report/report.service';
import { FeedbackService } from '../feedback/feedback.service';
import { userTableName } from '../user/user.service';
import { bookTableName } from '../book/book.service';
import { AdminStats, AdminDatabaseUsage } from './admin.interface';
import { NBUser } from '../user/user.interface';
import { NBBook } from '../book/book.interface';
/**
* Admin service.
*/
@Injectable()
export class AdminService {
constructor(
@Inject(forwardRef(() => DBService))
private readonly dbService: DBService,
@Inject(forwardRef(() => ReportService))
private readonly reportService: ReportService,
@Inject(forwardRef(() => FeedbackService))
private readonly feedbackService: FeedbackService,
) {}
/**
* Get site statistics.
*
* @returns Site statistics.
*/
public async getStats(): Promise<AdminStats> {
const dbRows = 10000000;
const dbUsage = await this.getDatabaseUsage();
const tables = await this.getTables();
const tableRows = await this.getAllTableRowCounts();
const rowCount = tableRows.reduce((acc, current) => {
acc += current.rows;
return acc;
}, 0);
const booksListedSql = `
SELECT SUM("numBooksListed") AS sum
FROM "${userTableName}";`;
const booksListedRes = await this.dbService.execute<{ sum: number }>(
booksListedSql,
);
const booksListed =
typeof booksListedRes[0].sum === 'string'
? parseInt(booksListedRes[0].sum)
: booksListedRes[0].sum ?? 0;
const booksSoldSql = `
SELECT SUM("numBooksSold") AS sum
FROM "${userTableName}";`;
const booksSoldRes = await this.dbService.execute<{ sum: number }>(
booksSoldSql,
);
const booksSold =
typeof booksSoldRes[0].sum === 'string'
? parseInt(booksSoldRes[0].sum)
: booksSoldRes[0].sum ?? 0;
const moneyMadeSql = `
SELECT SUM("moneyMade") AS sum
FROM "${userTableName}";`;
const moneyMadeRes = await this.dbService.execute<{ sum: number }>(
moneyMadeSql,
);
const moneyMade =
typeof moneyMadeRes[0].sum === 'string'
? parseFloat(moneyMadeRes[0].sum)
: moneyMadeRes[0].sum ?? 0;
const reports = await this.reportService.getReports();
const feedback = await this.feedbackService.getAllFeedback();
return {
users: dbUsage.NB_USER,
books: dbUsage.NB_BOOK,
booksListed,
booksSold,
moneyMade,
tables: tables.length,
rows: rowCount,
capacity: rowCount / dbRows,
reports: reports.length,
feedback: feedback.length,
};
}
/**
* Get all users on the site.
*
* @returns All users on the site.
*/
public async getUsers(): Promise<NBUser[]> {
return this.dbService.list<NBUser>(userTableName, {
fieldName: 'joinTime',
sortOrder: 'ASC',
});
}
/**
* Get all books on the site.
*
* @returns All books on the site.
*/
public async getBooks(): Promise<NBBook[]> {
return this.dbService.list<NBBook>(bookTableName, {
fieldName: 'listTime',
sortOrder: 'ASC',
});
}
/**
* Get the database usage statistics.
*
* @returns The database usage statistics.
*/
public async getDatabaseUsage(): Promise<AdminDatabaseUsage> {
const rowCounts = await this.getAllTableRowCounts();
return rowCounts.reduce((acc, row) => {
acc[row.table] = row.rows;
return acc;
}, {});
}
/**
* Get all tables.
*
* @returns All tables.
*/
private async getTables(): Promise<{ table: string }[]> {
const sql = `
SELECT table_name AS table
FROM information_schema.tables
WHERE table_schema = 'public';`;
return this.dbService.execute<{ table: string }>(sql);
}
/**
* Get all columns in a table.
*
* @param tableName The name of the table.
* @returns All columns in the table.
*/
private async getTableColumns(
tableName: string,
): Promise<{ column: string }[]> {
const sql = `
SELECT column_name AS column
FROM information_schema.columns
WHERE table_name = ?;`;
const params = [tableName];
return this.dbService.execute<{ column: string }>(sql, params);
}
/**
* Get all tables and their columns.
*
* @returns All tables and their columns.
*/
private async getAllTableColumns(): Promise<
{ table: string; column: string }[]
> {
const sql = `
SELECT
information_schema.tables.table_name AS table,
information_schema.columns.column_name AS column
FROM information_schema.tables
JOIN information_schema.columns
ON information_schema.tables.table_name = information_schema.columns.table_name
WHERE information_schema.tables.table_schema = 'public'
ORDER BY "table", "column";`;
return this.dbService.execute<{ table: string; column: string }>(sql);
}
/**
* Get the row count for a table.
*
* @param tableName The name of the table.
* @returns The row count for the table.
*/
private async getTableRowCount(tableName: string): Promise<number> {
const sql = `SELECT COUNT(*) FROM "${tableName}"`;
const rows = await this.dbService.execute<{ rows: number }>(sql);
return rows[0].rows;
}
/**
* Get all table row counts.
*
* @returns All table row counts.
*/
private async getAllTableRowCounts(): Promise<
{ table: string; rows: number }[]
> {
const sql = `
SELECT
table_name AS table,
(xpath('/row/cnt/text()', xml_count))[1]::text::int as rows
FROM (
SELECT
table_name, table_schema,
query_to_xml(format('SELECT COUNT(*) as cnt from %I.%I', table_schema, table_name), false, true, '') as xml_count
FROM information_schema.tables
WHERE table_schema = 'public'
) foo
ORDER BY "table" ASC;`;
return this.dbService.execute<{ table: string; rows: number }>(sql);
}
}
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