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‎CHANGELOG.md

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# CHANGELOG
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## 1.3
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### Fixed
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- better handling for logging of the current query name (function name)
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## 1.2
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### New
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- added `console` object to log debug objects to `SUPASCRIPT_LOG` table

‎supascript--1.3.sql

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--complain if script is sourced in psql, rather than via CREATE EXTENSION
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\echo Use "CREATE EXTENSION supascript CASCADE" to load this file. \quit
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/* the alter database line below needs to be run ONCE on your database */
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SET PLV8.START_PROC = 'supascript_init';
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ALTER DATABASE POSTGRES SET PLV8.START_PROC TO 'supascript_init';
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CREATE TABLE IF NOT EXISTS SUPASCRIPT_LOG
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(
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id uuid primary key default uuid_generate_v4(),
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created timestamp with time zone DEFAULT CURRENT_TIMESTAMP,
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_catalog text DEFAULT CURRENT_CATALOG,
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_user text DEFAULT CURRENT_USER,
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_schema text DEFAULT CURRENT_SCHEMA,
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_schemas name[] DEFAULT CURRENT_SCHEMAS(true),
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_pid int DEFAULT PG_BACKEND_PID(),
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log_type text,
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query text,
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content jsonb
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);
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CREATE TABLE IF NOT EXISTS SUPASCRIPT_JS_MODULES (MODULE text UNIQUE PRIMARY KEY,
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AUTOLOAD BOOL DEFAULT FALSE,
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SOURCE text);
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CREATE OR REPLACE FUNCTION supascript_init() RETURNS VOID
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AS $$
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this.moduleCache = {};
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// this handles "TypeError: Do not know how to serialize a BigInt"
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function toJson(data) {
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if (data !== undefined) {
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return JSON.stringify(data, (_, v) => typeof v === 'bigint' ? `${v}#bigint` : v)
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.replace(/"(-?\d+)#bigint"/g, (_, a) => a);
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}
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}
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this.console = {
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timers:{},
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write_to_log: function() {
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const arr = [];
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for (let i=0; i < arguments.length; i++) {
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if (!(i === 1 && arguments[0] === 'ASSERT')) {
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const arg = JSON.parse(toJson(arguments[i])); // required to handle bigint
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arr.push(arg);
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}
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}
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let query = '';
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try {
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query = JSON.stringify(sql('select current_query()')[0].current_query);
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if (query.length > 23 && query.substr(0,23).toLowerCase() === '"with pgrst_source as (') {
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query = query.substr(23);
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let index = query.indexOf('AS pgrst_scalar');
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if (index < 0) { index = 999; };
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query = query.substr(0,index);
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query = query.replace(new RegExp(String.fromCharCode(92, 92, 34), 'g'), String.fromCharCode(34));
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}
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} catch (queryParseError) {
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query = 'query parse error';
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}
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const log_type = arr.shift();
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sql(`insert into supascript_log (content, log_type, query) values ($1, $2, $3)`,[arr, log_type, query]);
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},
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log: function() {
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console.write_to_log('LOG', ...arguments);
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},
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info: function() {
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console.write_to_log('INFO', ...arguments);
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},
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warn: function() {
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console.write_to_log('WARN', ...arguments);
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},
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assert: function() {
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if (arguments[0] === false) {
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// arguments.shift(); // remove assert expression
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console.write_to_log('ASSERT', ...arguments); // log rest of arguments (1 to n)
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}
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},
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error: function() {
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console.write_to_log('ERROR', ...arguments);
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},
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time: function(label = 'DEFAULT_TIMER') {
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this.timers[label] = +new Date();
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},
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timeEnd: function(label = 'DEFAULT_TIMER') {
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console.write_to_log('TIMER',label,+new Date() - this.timers[label]);
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delete this.timers[label];
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}
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};
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// execute a Postgresql function
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// i.e. exec('my_function',['parm1', 123, {"item_name": "test json object"}])
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this.exec = function(function_name, parms) {
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var func = plv8.find_function(function_name);
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return func(...parms);
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}
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this.load = function(key, source) {
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var module = {exports: {}};
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try {
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eval("(function(module, exports) {" + source + "; })")(module, module.exports);
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} catch (err) {
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plv8.elog(ERROR, `eval error in source: ${err} (SOURCE): ${source}`);
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}
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// store in cache
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moduleCache[key] = module.exports;
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return module.exports;
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};
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// execute a sql statement against the Postgresql database with optional args
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// i.e. sql('select * from people where first_name = $1 and last_name = $2', ['John', 'Smith'])
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this.sql = function(sql_statement, args) {
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if (args) {
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return plv8.execute(sql_statement, args);
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} else {
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return plv8.execute(sql_statement);
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}
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};
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// emulate node.js "require", with automatic download from the internet via CDN sites
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// optional autoload (boolean) parameter allows the module to be preloaded later
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// i.e. var myModule = require('https://some.cdn.com/module_content.js', true)
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this.require = function(module, autoload) {
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if (module === 'http' || module === 'https') {
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// emulate NodeJS require('http')
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module = 'https://raw.githubusercontent.com/burggraf/SupaScript/main/modules/http.js';
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}
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if(moduleCache[module])
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return moduleCache[module];
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var rows = plv8.execute(
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'select source from supascript_js_modules where module = $1',
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[module]
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);
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if (rows.length === 0 && module.substr(0,4) === 'http') {
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try {
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source = plv8.execute(`SELECT content FROM http_get('${module}');`)[0].content;
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} catch (err) {
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plv8.elog(ERROR, `Could not load module through http: ${module}`, JSON.stringify(err));
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}
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try {
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/* the line below is written purely for esthetic reasons, so as not to mess up the online source editor */
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/* when using standard regExp expressions, the single-quote char messes up the code highlighting */
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/* in the editor and everything looks funky */
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const quotedSource = source.replace(new RegExp(String.fromCharCode(39), 'g'), String.fromCharCode(39, 39));
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plv8.execute(`insert into supascript_js_modules (module, autoload, source) values ('${module}', ${autoload ? true : false}, '${quotedSource}')`);
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} catch (err) {
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plv8.elog(ERROR, `Error inserting module into supascript_js_modules: ${err} ${module}, ${autoload ? true : false}, '${plv8.quote_literal(source)}'`);
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}
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return load(module, source);
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} else if(rows.length === 0) {
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plv8.elog(NOTICE, `Could not load module: ${module}`);
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return null;
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} else {
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return load(module, rows[0].source);
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}
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};
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// Grab modules worth auto-loading at context start and let them cache
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var query = `select module, source from supascript_js_modules where autoload = true`;
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plv8.execute(query).forEach(function(row) {
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this.load(row.module, row.source);
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});
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$$ LANGUAGE PLV8;

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