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const debug = require('debug')('express-cassandra');
const JanusGraphBuilder = function f(client, config) {
this._client = client;
this._config = config;
};
JanusGraphBuilder.prototype = {
create_graph(graphName, callback) {
debug('creating janus graph: %s', graphName);
const script = `
Map<String, Object> map = new HashMap<String, Object>();
map.put("storage.backend", storageBackend);
map.put("storage.hostname", storageHostname);
map.put("storage.port", storagePort);
map.put("index.search.backend", indexBackend);
map.put("index.search.hostname", indexHostname);
map.put("index.search.port", indexPort);
map.put("graph.graphname", graphName);
ConfiguredGraphFactory.createConfiguration(new MapConfiguration(map));
ConfiguredGraphFactory.open(graphName).vertices().size();
`;
const bindings = {
storageBackend: this._config.storage.backend,
storageHostname: this._config.storage.hostname,
storagePort: this._config.storage.port,
indexBackend: this._config.index.search.backend,
indexHostname: this._config.index.search.hostname,
indexPort: this._config.index.search.port,
graphName,
};
this._client.execute(script, bindings, (err, results) => {
if (err) {
callback(err);
return;
}
callback(null, results);
});
},
check_graph_exist(graphName, callback) {
debug('check for janus graph: %s', graphName);
const script = `
ConfiguredGraphFactory.getGraphNames();
`;
const bindings = {};
this._client.execute(script, bindings, (err, results) => {
Iif (err) {
callback(err);
return;
}
Eif (_.isArray(results) && results.includes(graphName)) {
callback(null, true);
return;
}
callback(null, false);
});
},
assert_graph(graphName, callback) {
this.check_graph_exist(graphName, (err, exist) => {
Iif (err) {
callback(err);
return;
}
Iif (!exist) {
this.create_graph(graphName, callback);
return;
}
callback();
});
},
drop_graph(graphName, callback) {
debug('removing janus graph: %s', graphName);
const script = `
ConfiguredGraphFactory.drop(graphName);
`;
const bindings = {
graphName,
};
this._client.execute(script, bindings, (err, results) => {
if (err) {
callback(err);
return;
}
callback(null, results);
});
},
put_indexes(graphName, mappingName, indexes, callback) {
debug('syncing janus graph indexes for: %s', mappingName);
let script = `
graph = ConfiguredGraphFactory.open(graphName);
graph.tx().commit();
mgmt = graph.openManagement();
`;
const bindings = {
graphName,
};
// create indexes if not exist
Object.keys(indexes).forEach((index) => {
if (indexes[index].type === 'Composite') {
script += `if (!mgmt.containsGraphIndex('${index}')) mgmt.buildIndex('${index}', Vertex.class)`;
indexes[index].keys.forEach((key) => {
script += `.addKey(mgmt.getPropertyKey('${key}'))`;
});
script += `.indexOnly(mgmt.getVertexLabel('${mappingName}'))`;
if (indexes[index].unique) {
script += '.unique()';
}
script += '.buildCompositeIndex();';
} else if (indexes[index].type === 'Mixed') {
script += `if (!mgmt.containsGraphIndex('${index}')) mgmt.buildIndex('${index}', Vertex.class)`;
indexes[index].keys.forEach((key) => {
script += `.addKey(mgmt.getPropertyKey('${key}'))`;
});
script += `.indexOnly(mgmt.getVertexLabel('${mappingName}'))`;
Iif (indexes[index].unique) {
script += '.unique()';
}
script += '.buildMixedIndex("search");';
} else Eif (indexes[index].type === 'VertexCentric') {
script += `relationLabel = mgmt.getEdgeLabel('${indexes[index].label}');`;
script += `if (!mgmt.containsRelationIndex(relationLabel, '${index}')) mgmt.buildEdgeIndex(relationLabel, '${index}', Direction.${indexes[index].direction}, Order.${indexes[index].order}`;
indexes[index].keys.forEach((key) => {
script += `, mgmt.getPropertyKey('${key}')`;
});
script += ');';
}
});
script += 'mgmt.commit();';
// await index for registered or enabled status
Object.keys(indexes).forEach((index) => {
if (indexes[index].type === 'Composite') {
script += `mgmt.awaitGraphIndexStatus(graph, '${index}').status(SchemaStatus.REGISTERED, SchemaStatus.ENABLED).call();`;
} else if (indexes[index].type === 'Mixed') {
script += `mgmt.awaitGraphIndexStatus(graph, '${index}').status(SchemaStatus.REGISTERED, SchemaStatus.ENABLED).call();`;
} else Eif (indexes[index].type === 'VertexCentric') {
script += `mgmt.awaitRelationIndexStatus(graph, '${index}', '${indexes[index].label}').status(SchemaStatus.REGISTERED, SchemaStatus.ENABLED).call();`;
}
});
// enable index if in registered state
script += 'mgmt = graph.openManagement();';
Object.keys(indexes).forEach((index) => {
if (indexes[index].type === 'Composite') {
script += `if (mgmt.getGraphIndex('${index}').getIndexStatus(mgmt.getPropertyKey('${indexes[index].keys[0]}')).equals(SchemaStatus.REGISTERED)) mgmt.updateIndex(mgmt.getGraphIndex('${index}'), SchemaAction.ENABLE_INDEX);`;
} else if (indexes[index].type === 'Mixed') {
script += `if (mgmt.getGraphIndex('${index}').getIndexStatus(mgmt.getPropertyKey('${indexes[index].keys[0]}')).equals(SchemaStatus.REGISTERED)) mgmt.updateIndex(mgmt.getGraphIndex('${index}'), SchemaAction.ENABLE_INDEX);`;
} else Eif (indexes[index].type === 'VertexCentric') {
script += `if (mgmt.getRelationIndex(mgmt.getEdgeLabel('${indexes[index].label}'), '${index}').getIndexStatus().equals(SchemaStatus.REGISTERED)) mgmt.updateIndex(mgmt.getRelationIndex(mgmt.getEdgeLabel('${indexes[index].label}'), '${index}'), SchemaAction.ENABLE_INDEX);`;
}
});
script += 'mgmt.commit();';
// await index for enabled status
Object.keys(indexes).forEach((index) => {
if (indexes[index].type === 'Composite') {
script += `mgmt.awaitGraphIndexStatus(graph, '${index}').status(SchemaStatus.ENABLED).call();`;
} else if (indexes[index].type === 'Mixed') {
script += `mgmt.awaitGraphIndexStatus(graph, '${index}').status(SchemaStatus.ENABLED).call();`;
} else Eif (indexes[index].type === 'VertexCentric') {
script += `mgmt.awaitRelationIndexStatus(graph, '${index}', '${indexes[index].label}').status(SchemaStatus.ENABLED).call();`;
}
});
this._client.execute(script, bindings, (err, results) => {
Iif (err) {
callback(err);
return;
}
callback(null, results);
});
},
put_mapping(graphName, mappingName, mappingBody, callback) {
debug('syncing janus graph mapping: %s', mappingName);
let script = `
graph = ConfiguredGraphFactory.open(graphName);
graph.tx().commit();
mgmt = graph.openManagement();
if (!mgmt.containsVertexLabel(mappingName)) mgmt.makeVertexLabel(mappingName).make();
`;
const bindings = {
graphName,
mappingName,
};
Object.keys(mappingBody.relations).forEach((relation) => {
script += `
if (!mgmt.containsEdgeLabel('${relation}')) mgmt.makeEdgeLabel('${relation}').multiplicity(${mappingBody.relations[relation]}).make();
`;
});
Object.keys(mappingBody.properties).forEach((property) => {
script += `
if (!mgmt.containsPropertyKey('${property}')) mgmt.makePropertyKey('${property}').dataType(${mappingBody.properties[property].type}.class).cardinality(Cardinality.${mappingBody.properties[property].cardinality}).make();
`;
});
script += 'mgmt.commit();';
this._client.execute(script, bindings, (err, results) => {
Iif (err) {
callback(err);
return;
}
Eif (Object.keys(mappingBody.indexes).length > 0) {
this.put_indexes(graphName, mappingName, mappingBody.indexes, callback);
return;
}
callback(null, results);
});
},
};
module.exports = JanusGraphBuilder;
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