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const async = require('async');
const util = require('util');
const objectHash = require('object-hash');
const readlineSync = require('readline-sync');
const deepDiff = require('deep-diff').diff;
const buildError = require('../orm/apollo_error.js');
const schemer = require('../validators/schema');
const parser = require('../utils/parser');
const normalizer = require('../utils/normalizer');
const ElassandraBuilder = require('./elassandra');
const TableBuilder = function f(driver, properties) {
this._driver = driver;
this._properties = properties;
if (this._properties.esclient) {
this._es_builder = new ElassandraBuilder(this._properties.esclient);
}
};
TableBuilder.prototype = {
_confirm_migration(message) {
let permission = 'y';
if (message && !this._properties.disableTTYConfirmation) {
permission = readlineSync.question(util.format('Migration: %s (y/n): ', message));
}
return permission.toLowerCase();
},
get_table(callback) {
const properties = this._properties;
const keyspaceName = properties.keyspace;
const tableName = properties.table_name;
const dbSchema = { fields: {}, typeMaps: {}, staticMaps: {} };
const query = 'SELECT * FROM system_schema.columns WHERE table_name = ? AND keyspace_name = ?;';
this._driver.execute_query(query, [tableName, keyspaceName], (err, resultColumns) => {
Iif (err) {
callback(buildError('model.tablecreation.dbschemaquery', err));
return;
}
Iif (!resultColumns.rows || resultColumns.rows.length === 0) {
callback();
return;
}
for (let r = 0; r < resultColumns.rows.length; r++) {
const row = resultColumns.rows[r];
dbSchema.fields[row.column_name] = parser.extract_type(row.type);
const typeMapDef = parser.extract_typeDef(row.type);
Eif (typeMapDef.length > 0) {
dbSchema.typeMaps[row.column_name] = typeMapDef;
}
if (row.kind === 'partition_key') {
if (!dbSchema.key) dbSchema.key = [[]];
dbSchema.key[0][row.position] = row.column_name;
} else if (row.kind === 'clustering') {
if (!dbSchema.key) dbSchema.key = [[]];
if (!dbSchema.clustering_order) dbSchema.clustering_order = {};
dbSchema.key[row.position + 1] = row.column_name;
if (row.clustering_order && row.clustering_order.toLowerCase() === 'desc') {
dbSchema.clustering_order[row.column_name] = 'DESC';
} else {
dbSchema.clustering_order[row.column_name] = 'ASC';
}
} else if (row.kind === 'static') {
dbSchema.staticMaps[row.column_name] = true;
}
}
callback(null, dbSchema);
});
},
get_table_schema(callback) {
this.get_table((err, dbSchema) => {
Iif (err) {
callback(err);
return;
}
Iif (!dbSchema) {
callback();
return;
}
this.get_indexes((err1, indexSchema) => {
Iif (err1) {
callback(err1);
return;
}
this.get_mviews((err2, viewSchema) => {
Iif (err2) {
callback(err2);
return;
}
Object.assign(dbSchema, indexSchema, viewSchema);
callback(null, dbSchema);
});
});
});
},
create_table(schema, callback) {
const properties = this._properties;
const tableName = properties.table_name;
const rows = [];
let fieldType;
Object.keys(schema.fields).forEach((k) => {
if (schema.fields[k].virtual) {
return;
}
let segment = '';
fieldType = schemer.get_field_type(schema, k);
if (schema.fields[k].typeDef) {
segment = util.format('"%s" %s%s', k, fieldType, schema.fields[k].typeDef);
} else {
segment = util.format('"%s" %s', k, fieldType);
}
if (schema.fields[k].static) {
segment += ' STATIC';
}
rows.push(segment);
});
const clauses = parser.get_primary_key_clauses(schema);
const query = util.format(
'CREATE TABLE IF NOT EXISTS "%s" (%s , PRIMARY KEY((%s)%s))%s;',
tableName,
rows.join(' , '),
clauses.partitionKeyClause,
clauses.clusteringKeyClause,
clauses.clusteringOrderClause,
);
this._driver.execute_definition_query(query, (err, result) => {
if (err) {
callback(buildError('model.tablecreation.dbcreate', err));
return;
}
callback(null, result);
});
},
alter_table(operation, fieldname, type, callback) {
const properties = this._properties;
const tableName = properties.table_name;
if (operation === 'ALTER') type = util.format('TYPE %s', type);
else if (operation === 'DROP') type = '';
const query = util.format('ALTER TABLE "%s" %s "%s" %s;', tableName, operation, fieldname, type);
this._driver.execute_definition_query(query, callback);
},
_drop_table(tableName, callback) {
const query = util.format('DROP TABLE IF EXISTS "%s";', tableName);
this._driver.execute_definition_query(query, (err) => {
if (err) {
callback(buildError('model.tablecreation.dbdrop', err));
return;
}
callback();
});
},
drop_table(materializedViews, callback) {
const properties = this._properties;
const tableName = properties.table_name;
const message = util.format(
'Schema for table "%s" has changed in a way where alter migration is not possible, all data in the table will be lost, are you sure you want to drop the table?',
tableName,
);
const permission = this._confirm_migration(message);
if (permission !== 'y') {
callback(buildError('model.tablecreation.schemamismatch', tableName, 'migration suspended, please apply the change manually'));
return;
}
if (!materializedViews) {
this._drop_table(tableName, callback);
return;
}
const mviews = Object.keys(materializedViews);
this.drop_mviews(mviews, (err) => {
if (err) {
callback(err);
return;
}
this._drop_table(tableName, callback);
});
},
drop_recreate_table(modelSchema, materializedViews, callback) {
if (this._es_builder) {
const indexName = `${this._properties.keyspace}_${this._properties.table_name}`;
this._es_builder.delete_index(indexName, () => {
this.drop_table(materializedViews, (err1) => {
if (err1) {
callback(err1);
return;
}
this.create_table(modelSchema, callback);
});
});
return;
}
this.drop_table(materializedViews, (err1) => {
if (err1) {
callback(err1);
return;
}
this.create_table(modelSchema, callback);
});
},
get_indexes(callback) {
const properties = this._properties;
const keyspaceName = properties.keyspace;
const tableName = properties.table_name;
const dbSchema = {};
const query = 'SELECT * FROM system_schema.indexes WHERE table_name = ? AND keyspace_name = ?;';
this._driver.execute_query(query, [tableName, keyspaceName], (err, resultIndexes) => {
Iif (err) {
callback(buildError('model.tablecreation.dbschemaquery', err));
return;
}
for (let r = 0; r < resultIndexes.rows.length; r++) {
const row = resultIndexes.rows[r];
if (row.index_name && row.options.target) {
const indexOptions = row.options;
let target = indexOptions.target;
target = target.replace(/["\s]/g, '');
delete indexOptions.target;
// keeping track of index names to drop index when needed
if (!dbSchema.index_names) dbSchema.index_names = {};
if (row.kind === 'CUSTOM') {
const using = indexOptions.class_name;
delete indexOptions.class_name;
if (!dbSchema.custom_indexes) dbSchema.custom_indexes = [];
const customIndexObject = {
on: target,
using,
options: indexOptions,
};
dbSchema.custom_indexes.push(customIndexObject);
dbSchema.index_names[objectHash(customIndexObject)] = row.index_name;
} else {
if (!dbSchema.indexes) dbSchema.indexes = [];
dbSchema.indexes.push(target);
dbSchema.index_names[target] = row.index_name;
}
}
}
callback(null, dbSchema);
});
},
_create_index_query(tableName, indexName) {
let query;
const indexExpression = indexName.replace(/["\s]/g, '').split(/[()]/g);
if (indexExpression.length > 1) {
indexExpression[0] = indexExpression[0].toLowerCase();
query = util.format(
'CREATE INDEX IF NOT EXISTS ON "%s" (%s("%s"));',
tableName,
indexExpression[0],
indexExpression[1],
);
} else {
query = util.format(
'CREATE INDEX IF NOT EXISTS ON "%s" ("%s");',
tableName,
indexExpression[0],
);
}
return query;
},
create_indexes(indexes, callback) {
const properties = this._properties;
const tableName = properties.table_name;
async.eachSeries(indexes, (idx, next) => {
const query = this._create_index_query(tableName, idx);
this._driver.execute_definition_query(query, (err, result) => {
if (err) next(buildError('model.tablecreation.dbindexcreate', err));
else next(null, result);
});
}, callback);
},
_create_custom_index_query(tableName, customIndex) {
let query = util.format(
'CREATE CUSTOM INDEX IF NOT EXISTS ON "%s" ("%s") USING \'%s\'',
tableName,
customIndex.on,
customIndex.using,
);
if (Object.keys(customIndex.options).length > 0) {
query += ' WITH OPTIONS = {';
Object.keys(customIndex.options).forEach((key) => {
query += util.format("'%s': '%s', ", key, customIndex.options[key]);
});
query = query.slice(0, -2);
query += '}';
}
query += ';';
return query;
},
create_custom_indexes(customIndexes, callback) {
const properties = this._properties;
const tableName = properties.table_name;
async.eachSeries(customIndexes, (idx, next) => {
const query = this._create_custom_index_query(tableName, idx);
this._driver.execute_definition_query(query, (err, result) => {
if (err) next(buildError('model.tablecreation.dbindexcreate', err));
else next(null, result);
});
}, callback);
},
drop_indexes(indexes, callback) {
async.each(indexes, (idx, next) => {
const query = util.format('DROP INDEX IF EXISTS "%s";', idx);
this._driver.execute_definition_query(query, next);
}, (err) => {
if (err) callback(buildError('model.tablecreation.dbindexdrop', err));
else callback();
});
},
get_mviews(callback) {
const properties = this._properties;
const keyspaceName = properties.keyspace;
const tableName = properties.table_name;
const dbSchema = {};
let query = 'SELECT view_name,base_table_name,where_clause FROM system_schema.views WHERE keyspace_name=?;';
this._driver.execute_query(query, [keyspaceName], (err, resultViews) => {
Iif (err) {
callback(buildError('model.tablecreation.dbschemaquery', err));
return;
}
for (let r = 0; r < resultViews.rows.length; r++) {
const row = resultViews.rows[r];
if (row.view_name && row.base_table_name === tableName) {
if (!dbSchema.materialized_views) dbSchema.materialized_views = {};
dbSchema.materialized_views[row.view_name] = {
where_clause: row.where_clause,
};
}
}
if (!dbSchema.materialized_views) {
callback(null, dbSchema);
return;
}
query = 'SELECT * FROM system_schema.columns WHERE keyspace_name=? and table_name IN ?;';
const viewNames = Object.keys(dbSchema.materialized_views);
this._driver.execute_query(query, [keyspaceName, viewNames], (err1, resultMatViews) => {
Iif (err1) {
callback(buildError('model.tablecreation.dbschemaquery', err1));
return;
}
for (let r = 0; r < resultMatViews.rows.length; r++) {
const row = resultMatViews.rows[r];
if (!dbSchema.materialized_views[row.table_name].select) {
dbSchema.materialized_views[row.table_name].select = [];
}
dbSchema.materialized_views[row.table_name].select.push(row.column_name);
if (row.kind === 'partition_key') {
if (!dbSchema.materialized_views[row.table_name].key) {
dbSchema.materialized_views[row.table_name].key = [[]];
}
dbSchema.materialized_views[row.table_name].key[0][row.position] = row.column_name;
} else if (row.kind === 'clustering') {
if (!dbSchema.materialized_views[row.table_name].key) {
dbSchema.materialized_views[row.table_name].key = [[]];
}
Eif (!dbSchema.materialized_views[row.table_name].clustering_order) {
dbSchema.materialized_views[row.table_name].clustering_order = {};
}
dbSchema.materialized_views[row.table_name].key[row.position + 1] = row.column_name;
if (row.clustering_order && row.clustering_order.toLowerCase() === 'desc') {
dbSchema.materialized_views[row.table_name].clustering_order[row.column_name] = 'DESC';
} else {
dbSchema.materialized_views[row.table_name].clustering_order[row.column_name] = 'ASC';
}
}
}
callback(null, dbSchema);
});
});
},
_create_materialized_view_query(tableName, viewName, viewSchema) {
const rows = [];
for (let k = 0; k < viewSchema.select.length; k++) {
if (viewSchema.select[k] === '*') rows.push(util.format('%s', viewSchema.select[k]));
else rows.push(util.format('"%s"', viewSchema.select[k]));
}
const whereClause = viewSchema.where_clause || parser.get_mview_where_clause(this._properties.schema, viewSchema);
const clauses = parser.get_primary_key_clauses(viewSchema);
const query = util.format(
'CREATE MATERIALIZED VIEW IF NOT EXISTS "%s" AS SELECT %s FROM "%s" WHERE %s PRIMARY KEY((%s)%s)%s;',
viewName,
rows.join(' , '),
tableName,
whereClause,
clauses.partitionKeyClause,
clauses.clusteringKeyClause,
clauses.clusteringOrderClause,
);
return query;
},
create_mviews(materializedViews, callback) {
const properties = this._properties;
const tableName = properties.table_name;
async.eachSeries(Object.keys(materializedViews), (viewName, next) => {
const query = this._create_materialized_view_query(
tableName,
viewName,
materializedViews[viewName],
);
this._driver.execute_definition_query(query, (err, result) => {
if (err) next(buildError('model.tablecreation.matviewcreate', err));
else next(null, result);
});
}, callback);
},
drop_mviews(mviews, callback) {
async.each(mviews, (view, next) => {
const query = util.format('DROP MATERIALIZED VIEW IF EXISTS "%s";', view);
this._driver.execute_definition_query(query, next);
}, (err) => {
if (err) callback(buildError('model.tablecreation.matviewdrop', err));
else callback();
});
},
_apply_alter_operations(alterOperations, dbSchema, normalizedModelSchema, normalizedDBSchema, callback) {
// it should create/drop indexes/custom_indexes/materialized_views that are added/removed in model schema
// remove common indexes/custom_indexes/materialized_views from normalizedModelSchema and normalizedDBSchema
// then drop all remaining indexes/custom_indexes/materialized_views from normalizedDBSchema
// and add all remaining indexes/custom_indexes/materialized_views from normalizedModelSchema
const properties = this._properties;
const tableName = properties.table_name;
const addedIndexes = _.difference(normalizedModelSchema.indexes, normalizedDBSchema.indexes);
const removedIndexes = _.difference(normalizedDBSchema.indexes, normalizedModelSchema.indexes);
const removedIndexNames = [];
removedIndexes.forEach((removedIndex) => {
removedIndexNames.push(dbSchema.index_names[removedIndex]);
});
const addedCustomIndexes = _.filter(
normalizedModelSchema.custom_indexes,
(obj) => (!_.find(normalizedDBSchema.custom_indexes, obj)),
);
const removedCustomIndexes = _.filter(
normalizedDBSchema.custom_indexes,
(obj) => (!_.find(normalizedModelSchema.custom_indexes, obj)),
);
removedCustomIndexes.forEach((removedIndex) => {
removedIndexNames.push(dbSchema.index_names[objectHash(removedIndex)]);
});
const addedMaterializedViewsNames = _.filter(
Object.keys(normalizedModelSchema.materialized_views),
(viewName) => (!_.isEqual(
normalizedDBSchema.materialized_views[viewName],
normalizedModelSchema.materialized_views[viewName],
)),
);
const removedMaterializedViewNames = _.filter(
Object.keys(normalizedDBSchema.materialized_views),
(viewName) => (!_.isEqual(
normalizedDBSchema.materialized_views[viewName],
normalizedModelSchema.materialized_views[viewName],
)),
);
const addedMaterializedViews = {};
addedMaterializedViewsNames.forEach((viewName) => {
addedMaterializedViews[viewName] = normalizedModelSchema.materialized_views[viewName];
});
// remove altered materialized views
if (removedMaterializedViewNames.length > 0) {
const message = util.format(
'Schema for table "%s" has removed materialized_views: %j, are you sure you want to drop them?',
tableName,
removedMaterializedViewNames,
);
const permission = this._confirm_migration(message);
if (permission !== 'y') {
callback(buildError('model.tablecreation.schemamismatch', tableName, 'migration suspended, please apply the change manually'));
return;
}
}
this.drop_mviews(removedMaterializedViewNames, (err2) => {
if (err2) {
callback(err2);
return;
}
if (removedIndexNames.length > 0) {
const message = util.format(
'Schema for table "%s" has removed indexes: %j, are you sure you want to drop them?',
tableName,
removedIndexNames,
);
const permission = this._confirm_migration(message);
if (permission !== 'y') {
callback(buildError('model.tablecreation.schemamismatch', tableName, 'migration suspended, please apply the change manually'));
return;
}
}
// remove altered indexes by index name
this.drop_indexes(removedIndexNames, (err3) => {
if (err3) {
callback(err3);
return;
}
// now apply alterOperations here
async.eachSeries(alterOperations, (alterOperation, next) => {
const permission = this._confirm_migration(alterOperation.message);
if (permission !== 'y') {
callback(buildError('model.tablecreation.schemamismatch', tableName, 'migration suspended, please apply the change manually'));
return;
}
this.alter_table(alterOperation.operation, alterOperation.fieldName, alterOperation.type, next);
}, (err4) => {
if (err4) {
callback(err4);
return;
}
// add altered indexes
// eslint-disable-next-line max-nested-callbacks
this.create_indexes(addedIndexes, (err5) => {
if (err5) {
callback(err5);
return;
}
// add altered custom indexes
// eslint-disable-next-line max-nested-callbacks
this.create_custom_indexes(addedCustomIndexes, (err6) => {
if (err6) {
callback(err6);
return;
}
// add altered materialized_views
this.create_mviews(addedMaterializedViews, callback);
});
});
});
});
});
},
init_alter_operations(modelSchema, dbSchema, normalizedModelSchema, normalizedDBSchema, callback) {
const properties = this._properties;
const tableName = properties.table_name;
const alterOperations = [];
const differences = deepDiff(normalizedDBSchema.fields, normalizedModelSchema.fields);
let droppedFields = false;
async.eachSeries(differences, (diff, next) => {
const fieldName = diff.path[0];
if (diff.kind === 'N') {
const message = util.format(
'Schema for table "%s" has added field "%s", are you sure you want to alter to add the field?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'ADD',
type: parser.extract_altered_type(normalizedModelSchema, diff),
});
next();
return;
}
if (diff.kind === 'D') {
const message = util.format(
'Schema for table "%s" has removed field "%s", all data in the field will lost, are you sure you want to alter to drop the field?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'DROP',
});
droppedFields = true;
normalizer.remove_dependent_views_from_normalized_schema(normalizedDBSchema, dbSchema, fieldName);
next();
return;
}
if (diff.kind === 'E') {
// check if the alter field type is possible, otherwise try D and then N
if (diff.path[1] === 'type') {
// check if field part of primary key
if (normalizedDBSchema.key[0].includes(fieldName) || normalizedDBSchema.key.indexOf(fieldName) > 0) {
// alter field type impossible
next(new Error('alter_impossible'));
} else if (['text', 'ascii', 'bigint', 'boolean', 'decimal',
'double', 'float', 'inet', 'int', 'timestamp', 'timeuuid',
'uuid', 'varchar', 'varint'].includes(diff.lhs) && diff.rhs === 'blob') {
// alter field type possible
const message = util.format(
'Schema for table "%s" has new type for field "%s", are you sure you want to alter to update the field type?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'ALTER',
type: diff.rhs,
});
next();
} else if (diff.lhs === 'int' && diff.rhs === 'varint') {
// alter field type possible
const message = util.format(
'Schema for table "%s" has new type for field "%s", are you sure you want to alter to update the field type?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'ALTER',
type: diff.rhs,
});
next();
} else if (diff.lhs === 'timeuuid' && diff.rhs === 'uuid') {
// alter field type possible
const message = util.format(
'Schema for table "%s" has new type for field "%s", are you sure you want to alter to update the field type?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'ALTER',
type: diff.rhs,
});
next();
} else {
// alter type impossible
const message = util.format(
'Schema for table "%s" has new type for field "%s", all data in the field will be lost, are you sure you want to drop the field & recreate it?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'DROP',
});
alterOperations.push({
fieldName,
operation: 'ADD',
type: parser.extract_altered_type(normalizedModelSchema, diff),
});
droppedFields = true;
normalizer.remove_dependent_views_from_normalized_schema(normalizedDBSchema, dbSchema, fieldName);
next();
}
} else {
// alter type impossible
const message = util.format(
'Schema for table "%s" has new type for field "%s", all data in the field will be lost, are you sure you want to drop the field & recreate it?',
tableName,
fieldName,
);
alterOperations.push({
fieldName,
message,
operation: 'DROP',
});
alterOperations.push({
fieldName,
operation: 'ADD',
type: parser.extract_altered_type(normalizedModelSchema, diff),
});
droppedFields = true;
normalizer.remove_dependent_views_from_normalized_schema(normalizedDBSchema, dbSchema, fieldName);
next();
}
return;
}
next();
}, (err) => {
if (err) {
callback(err);
return;
}
if (droppedFields && this._es_builder) {
const indexName = `${properties.keyspace}_${properties.table_name}`;
this._es_builder.delete_index(indexName, () => {
this._apply_alter_operations(alterOperations, dbSchema, normalizedModelSchema, normalizedDBSchema, callback);
});
return;
}
this._apply_alter_operations(alterOperations, dbSchema, normalizedModelSchema, normalizedDBSchema, callback);
});
},
};
module.exports = TableBuilder;
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