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elastic_dsl.js
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elastic_dsl.js
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/*
* IFQL to ES DSL
* QXIP BV 2018
*/
const nearley = require('nearley');
const grammar = require('./ifql-parse');
const timestring = require('timestring');
let count=0;
function walk(obj, fn) {
if(!obj) return;
const result = fn(obj);
if(result == false) return;
if(typeof obj == 'object') {
for(i in obj) {
walk(obj[i], fn);
}
}
}
// ES
var dsl = {
"query": {}
};
var bool = {
"must": [],
"must_not": [],
"filter": [],
}
var range = {};
function index(obj,is,value) {
if (typeof is == 'string')
return index(obj,is.split('.'), value);
else if (is.length==1 && value!==undefined)
return obj[is[0]] = value;
else if (is.length==0)
return obj;
else
return index(obj[is[0]],is.slice(1), value);
}
function leftRight(operator,data){
if(data.left.value == 'time') return;
if(operator == "AND" && data.left.right){
leftRight(data.left.operator,data.left);
leftRight(data.right.operator,data.right);
return;
}
switch( operator ){
case "=":
bool.must.push( { match: { [data.left.value]: data.right.value }} );
break;
case "NOT":
bool.must_not.push( { match: { [data.left.value]: data.right.value }} );
break;
case ">":
range[data.left.value] = {};
range[data.left.value].gte = data.right.value;
break;
case "<":
range[data.left.value] = {};
range[data.left.value].lte = data.right.value;
break;
case "BETWEEN":
range[data.left.value] = {};
range[data.left.value].gte = data.right.value[0];
range[data.left.value].lte = data.right.value[1];
break;
}
}
function parserDefinition(options) {
options = options || {};
options.stringEscape=options.stringEscape || (x=>'"'+x+'"');
options.identifierEscape=options.identifierEscape || (x=>'`'+x+'`');
return {
toSql(parsed) {
if(!parsed) return '';
if(!parsed.type) return '';
const spacing=options.spacing || '';
options = options || {};
switch(parsed.type) {
case 'create_view': {
const table=this.toSql(parsed.table, options);
const definition=this.toSql(parsed.definition, options);
let sql='create ';
if(parsed.replace) sql+='or replace ';
sql+=('view ' + table + ' as '+definition);
return sql;
}
case 'select': {
let sql='(select ';
if(parsed.top) sql+='top '+parsed.top+' ';
if(parsed.all_distinct) sql+=this.toSql(parsed.all)+' ';
let selection;
if(parsed.selection.columns) selection=parsed.selection.columns.map(x=>this.toSql(x)).join(', ');
else selection=this.toSql(parsed.selection);
sql+=selection;
if(parsed.table_exp) sql+=' '+this.toSql(parsed.table_exp);
return sql+')';
}
case 'union': {
const left=this.toSql(parsed.left);
const right=this.toSql(parsed.right);
return '(('+left+') union ('+right+'))';
}
case 'from': {
let sql='from (';
if(parsed.table_refs) sql+=parsed.table_refs.map(x=>this.toSql(x)).join(', ');
else if(parsed.subquery) sql+=this.toSql(parsed.subquery);
return sql+')';
}
case 'from_table': {
let sql=this.toSql(parsed.from);
if(parsed.where) sql+=' '+this.toSql(parsed.where);
if(parsed.groupby) sql+=' '+this.toSql(parsed.groupby);
if(parsed.having) sql+=' '+this.toSql(parsed.having);
if(parsed.order) sql+=' '+this.toSql(parsed.order);
return sql;
}
case 'all': return 'all';
case 'distinct': return 'distinct';
case 'group_by': {
return 'group by ('+this.toSql(parsed.columns)+')';
}
case 'select_all': return '*';
case 'column': {
let sql='';
if(parsed.expression) {
sql+=this.toSql(parsed.expression);
}
else if(parsed.name) {
if(parsed.table) sql+=options.identifierEscape(parsed.table)+'.';
sql+=options.identifierEscape(parsed.name);
}
if(parsed.alias) sql+=' as '+this.toSql(parsed.alias);
return sql;
}
case 'expr_comma_list': {
return parsed.exprs.map(x=>this.toSql(x)).join(', ');
}
case 'table_ref': {
let sql='('+this.toSql(parsed.left);
if(parsed.side) sql+=' '+parsed.side+' ';
sql+='join '+this.toSql(parsed.right);
if(parsed.on) sql+=' on '+this.toSql(parsed.on);
return sql+')';
}
case 'table': {
let sql=options.identifierEscape(parsed.table);
if(parsed.alias)sql+='as '+options.identifierEscape(parsed.alias);
return sql;
}
case 'where': {
let sql='where (';
const condition=this.toSql(parsed.condition);
sql+=condition+')';
return sql;
}
case 'having': {
let sql='having (';
const condition=this.toSql(parsed.condition);
sql+=condition+')';
return sql;
}
case 'selection_columns': {
return parsed.columns.map(x=>this.toSql(x)).join(', ');
}
case 'order': {
let sql='order by (';
sql+=parsed.order.map(x => this.toSql(x)).join(', ')+')';
return sql;
}
case 'order_statement': {
const value=this.toSql(parsed.value);
sql=value;
if(parsed.direction) sql+=' '+parsed.direction;
return sql;
}
case 'operator': {
let sql='(';
if(parsed.operator=='not') {
const operand=this.toSql(parsed.operand);
sql+='not '+operand;
} else {
const left=this.toSql(parsed.left);
const right=this.toSql(parsed.right);
sql+=left+' '+parsed.operator+' '+right;
}
return sql+')';
}
case 'is_null': {
const value=this.toSql(parsed.value);
let sql='('+value+' is ';
if(parsed.not) sql+='not ';
sql+='null)';
return sql;
}
case 'in': {
const value=this.toSql(parsed.value);
let sql='('+value+' ';
if(parsed.not) sql+='not';
sql+='in ';
if(parsed.subquery) sql+='('+this.toSql(parsed.subquery)+')';
else if(parsed.expressions) sql+='('+parsed.expressions.map(x=>this.toSql(x)).join(', ')+')';
return sql+')';
}
case 'between': {
const value=this.toSql(parsed.value);
const lower=this.toSql(parsed.lower);
const upper=this.toSql(parsed.upper);
let sql='('+value+' ';
if(parsed.not) sql+='not ';
sql+='between '+lower+' and '+upper+')';
return sql;
}
case 'like': {
const value=this.toSql(parsed.value);
const comparison=this.toSql(parsed.comparison);
let sql='('+value+' ';
if(parsed.not) sql+='not ';
sql+='like '+comparison+')';
return sql;
}
case 'exists': {
const query=this.toSql(parsed.query);
return '(exists '+query+')';
}
case 'null': return 'null';
case 'true': return 'true';
case 'false': return 'false';
case 'if': {
const condition=this.toSql(parsed.condition);
const then=this.toSql(parsed.then);
const elseExpr=this.toSql(parsed['else']);
return 'if('+condition+', '+then+', '+elseExpr+')';
}
case 'case': {
let sql='(case ';
if(parsed.match) sql+= this.toSql(parsed.match)+' ';
sql+=parsed.when_statements.map(when => this.toSql(when)).join(' ');
if(parsed['else']) {
sql+=' else '+this.toSql(parsed['else']);
}
sql+=' end)';
return sql;
}
case 'when': {
const condition=this.toSql(parsed.condition);
const then=this.toSql(parsed.then);
return 'when '+condition+' then '+then;
}
case 'convert': {
const value=this.toSql(parsed.value);
const using=this.toSql(parsed.using);
return 'conver('+value+' using '+using+")";
}
case 'interval': {
const value=this.toSql(parsed.value);
const unit=this.toSql(parsed.unit);
return 'interval '+value+ ' '+unit;
}
case 'cast': {
const value=this.toSql(parsed.value);
const type=this.toSql(parsed.data_type);
return 'cast('+value+' as '+type+')';
}
case 'data_type': {
let sql=parsed.data_type;
if(parsed.size) sql+='('+parsed.size+')';
else if(parsed.size1) sql+='('+parsed.size1+', '+parsed.size2+')';
return sql;
}
case 'date_unit': {
return parsed.date_unit;
}
case 'function_call': {
let sql=parsed.name.value + '(';
if(parsed.select_all) return sql+'*)';
if(!parsed.parameters.length) return sql+')';
if(parsed.distinct) sql += 'distinct ';
if(parsed.all) sql += 'all ';
sql += parsed.parameters.map(p => this.toSql(p)).join(', ');
return sql+')';
}
case 'string': {
return options.stringEscape(parsed.string);
}
case 'identifier': {
return options.identifierEscape(parsed.value);
}
case 'decimal':{
return parsed.value;
}}
return '-- Invalid sql.type: ' + parsed.type + '\n';
},
parse(sql) {
const parser = new nearley.Parser(grammar.ParserRules, grammar.ParserStart);
// Sanitize IFQL
var sql = sql.replace(/"/g,'');
var sql = sql.replace(/:/g,'');
const parsed = parser.feed(sql);
const parsedResult = parsed.results;
if(!parsedResult.length) throw 'Invalid sql: ' + sql;
if(parsedResult.length > 1) {
// console.error(JSON.stringify(parsedResult, null, 2));
//throw 'SQL ambiguous: Report to developers ' + sql;
}
const result = parsedResult[0];
const referencedTables = {};
const joins = [];
walk(result, node => {
if(node.type == 'operator') {
leftRight(node.operator,node);
if(node.left && node.right){
// Resolve Time function
if(node.left.value == "time"){
if(!range['@timestamp']) range['@timestamp'] = {};
if(node.right.left && node.right.right) {
if(node.right.left.name && node.right.left.name.value == "now"){
range['@timestamp'].lte = new Date().getTime();
}
if(node.right.right.range && node.right.operator){
var timeeq = node.right.right.value + node.right.right.range.data_type;
if (node.right.operator == '-') range['@timestamp'].gte = new Date().getTime() - timestring(timeeq)
else if (node.right.operator == '+') range['@timestamp'].gte = new Date().getTime() + timestring(timeeq)
range['@timestamp'].lte = new Date().getTime();
}
}
else if(node.right.name && node.right.name.value == "now"){
range['@timestamp'].lte = new Date().getTime();
}
}
}
}
if(node.type == 'table') {
var select = node.table ? node.table.split('.') : [];
if(select && select.length > 2){
node.db = select[0];
node.ret = select[1];
node.table = select[2];
} else if(select.length > 1){
node.db = select[0];
node.table = select[1];
}
referencedTables[node.table] = node;
}
if(node.type == 'table_ref' && node.on) {
const columns = [];
walk(node.on, n => {
if(n.type == 'table_ref') return false;
if(n.type == 'column') {
columns.push(n);
return false;
}
});
joins.push({
right: node.right,
columns: columns
});
}
});
const operation = result.type;
let createdTables, sourceTables;
if(operation=='create_view') {
createdTables=[result.table.table];
sourceTables=Object.keys(referencedTables).filter(x => x != result.table.table);
} else {
sourceTables=Object.keys(referencedTables);
}
const returnColumns=[];
if(operation=='select') {
if(result.selection && result.selection.columns) {
result.selection.columns.forEach(column => {
const sourceColumns=[];
walk(column.expression, n => {
if(n.type=='column') {
sourceColumns.push(n);
return false;
}
if(n.type=='identifier') {
sourceColumns.push(n);
return false;
}
});
let name;
if(column.alias) name=column.alias.value;
else name=column.expression;
returnColumns.push({
name: name,
sourceColumns: sourceColumns
});
});
}
}
if (Array.isArray(returnColumns)){
var aggs = {};
var parent = [];
returnColumns.forEach(function(key,i){
parent.push(key.name);
var jid = parent.join('.')
index(aggs,jid,{ "terms" : { "field" : key.sourceColumns[0].value || key.value } });
if(i<returnColumns.length-1){
index(aggs,jid+".aggregations",{});
parent.push('aggregations');
}
})
dsl.aggregations = aggs;
}
bool.filter.push({ range: range });
dsl.query.bool = bool;
return dsl;
}
};};
const basicParser=parserDefinition({});
parserDefinition.parse=function(sql){return basicParser.parse(sql);}
parserDefinition.toSql=function(parsed){return basicParser.toSql(parsed);}
module.exports=parserDefinition;