mirror of https://gitee.com/bigwinds/arangodb
869 lines
29 KiB
JavaScript
869 lines
29 KiB
JavaScript
/*jslint indent: 2, nomen: true, maxlen: 100, sloppy: true, vars: true, white: true, plusplus: true, evil: true */
|
|
/*global require */
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief traversal actions
|
|
///
|
|
/// @file
|
|
///
|
|
/// DISCLAIMER
|
|
///
|
|
/// Copyright 2012 triagens GmbH, Cologne, Germany
|
|
///
|
|
/// Licensed under the Apache License, Version 2.0 (the "License");
|
|
/// you may not use this file except in compliance with the License.
|
|
/// You may obtain a copy of the License at
|
|
///
|
|
/// http://www.apache.org/licenses/LICENSE-2.0
|
|
///
|
|
/// Unless required by applicable law or agreed to in writing, software
|
|
/// distributed under the License is distributed on an "AS IS" BASIS,
|
|
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
/// See the License for the specific language governing permissions and
|
|
/// limitations under the License.
|
|
///
|
|
/// Copyright holder is triAGENS GmbH, Cologne, Germany
|
|
///
|
|
/// @author Jan Steemann
|
|
/// @author Copyright 2013, triAGENS GmbH, Cologne, Germany
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
var arangodb = require("org/arangodb");
|
|
var actions = require("org/arangodb/actions");
|
|
var db = require("internal").db;
|
|
var traversal = require("org/arangodb/graph/traversal");
|
|
var Traverser = traversal.Traverser;
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- private functions
|
|
// -----------------------------------------------------------------------------
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @addtogroup ArangoAPI
|
|
/// @{
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief create a "bad parameter" error
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
function badParam (req, res, message) {
|
|
actions.resultBad(req,
|
|
res,
|
|
arangodb.ERROR_HTTP_BAD_PARAMETER,
|
|
message);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief create a "not found" error
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
function notFound (req, res, code, message) {
|
|
actions.resultNotFound(req,
|
|
res,
|
|
code,
|
|
message);
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief validate and translate the argument given in value
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
function validateArg (value, map) {
|
|
if (value === null || value === undefined) {
|
|
var m;
|
|
// use first key from map
|
|
for (m in map) {
|
|
if (map.hasOwnProperty(m)) {
|
|
value = m;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (typeof value === 'string') {
|
|
value = value.toLowerCase().replace(/-/, "");
|
|
if (map[value] !== null) {
|
|
return map[value];
|
|
}
|
|
}
|
|
|
|
return undefined;
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief execute a server-side traversal
|
|
///
|
|
/// @RESTHEADER{POST /_api/traversal,executes a traversal}
|
|
///
|
|
/// @RESTBODYPARAM{body,string,required}
|
|
///
|
|
/// @RESTDESCRIPTION
|
|
/// Starts a traversal starting from a given vertex and following.
|
|
/// edges contained in a given edgeCollection. The request must
|
|
/// contain the following attributes.
|
|
///
|
|
/// - `startVertex`: id of the startVertex, e.g. `"users/foo"`.
|
|
///
|
|
/// - `edgeCollection`: name of the collection that contains the edges.
|
|
///
|
|
/// - `filter` (optional, default is to include all nodes):
|
|
/// body (JavaScript code) of custom filter function
|
|
/// function signature: (config, vertex, path) -> mixed
|
|
/// can return four different string values:
|
|
/// - `"exclude"` -> this vertex will not be visited.
|
|
/// - `"prune"` -> the edges of this vertex will not be followed.
|
|
/// - `""` or `undefined` -> visit the vertex and follow it's edges.
|
|
/// - `Array` -> containing any combination of the above.
|
|
/// If there is at least one `"exclude"` or `"prune"` respectivly
|
|
/// is contained, it's effect will occur.
|
|
/// - `minDepth` (optional, ANDed with any existing filters): visits only nodes in at least the given depth
|
|
/// - `maxDepth` (optional, ANDed with any existing filters): visits only nodes in at most the given depth
|
|
/// - `visitor` (optional): body (JavaScript) code of custom visitor function
|
|
/// function signature: (config, result, vertex, path) -> void
|
|
/// visitor function can do anything, but its return value is ignored. To
|
|
/// populate a result, use the `result` variable by reference
|
|
/// - `direction` (optional): direction for traversal
|
|
/// - *if set*, must be either `"outbound"`, `"inbound"`, or `"any"`
|
|
/// - *if not set*, the `expander` attribute must be specified
|
|
/// - `init` (optional): body (JavaScript) code of custom result initialisation function
|
|
/// function signature: (config, result) -> void
|
|
/// initialise any values in result with what is required
|
|
/// - `expander` (optional): body (JavaScript) code of custom expander function
|
|
/// *must* be set if `direction` attribute is *not* set
|
|
/// function signature: (config, vertex, path) -> array
|
|
/// expander must return an array of the connections for `vertex`
|
|
/// each connection is an object with the attributes `edge` and `vertex`
|
|
/// - `strategy` (optional): traversal strategy
|
|
/// can be `"depthfirst"` or `"breadthfirst"`
|
|
/// - `order` (optional): traversal order
|
|
/// can be `"preorder"` or `"postorder"`
|
|
/// - `itemOrder` (optional): item iteration order
|
|
/// can be `"forward"` or `"backward"`
|
|
/// - `uniqueness` (optional): specifies uniqueness for vertices and edges visited
|
|
/// if set, must be an object like this:
|
|
/// `"uniqueness": {"vertices": "none"|"global"|path", "edges": "none"|"global"|"path"}`
|
|
///
|
|
///
|
|
/// If the Traversal is successfully executed `HTTP 200` will be returned.
|
|
/// Additionally the `result` object will be returned by the traversal.
|
|
///
|
|
/// For successful traversals, the returned JSON object has the
|
|
/// following properties:
|
|
///
|
|
/// - `error`: boolean flag to indicate if an error occurred (`false`
|
|
/// in this case)
|
|
///
|
|
/// - `code`: the HTTP status code
|
|
///
|
|
/// - `result`: the return value of the traversal
|
|
///
|
|
/// If the traversal specification is either missing or malformed, the server
|
|
/// will respond with `HTTP 400`.
|
|
///
|
|
/// The body of the response will then contain a JSON object with additional error
|
|
/// details. The object has the following attributes:
|
|
///
|
|
/// - `error`: boolean flag to indicate that an error occurred (`true` in this case)
|
|
///
|
|
/// - `code`: the HTTP status code
|
|
///
|
|
/// - `errorNum`: the server error number
|
|
///
|
|
/// - `errorMessage`: a descriptive error message
|
|
///
|
|
/// example:
|
|
/// POST {"edgeCollection": "e", "expander": "var connections = [ ]; config.edgeCollection.outEdges(vertex).forEach(function (e) { connections.push({ vertex: e._to, edge: e }); }); return connections;", "startVertex" : "v/jan", "filter": "return undefined;", "minDepth": 0 }
|
|
///
|
|
/// @RESTRETURNCODES
|
|
///
|
|
/// @RESTRETURNCODE{200}
|
|
/// If the traversal is fully executed
|
|
/// `HTTP 200` will be returned.
|
|
///
|
|
/// @RESTRETURNCODE{400}
|
|
/// If the traversal specification is either missing or malformed, the server
|
|
/// will respond with `HTTP 400`.
|
|
///
|
|
/// @EXAMPLES
|
|
///
|
|
/// In the following examples the underlying graph will contain five persons
|
|
/// `Alice`, `Bob`, `Charlie`, `Dave` and `Eve`.
|
|
/// We will have the following directed relations:
|
|
/// - `Alice` knows `Bob`
|
|
/// - `Bob` knows `Charlie`
|
|
/// - `Bob` knows `Dave`
|
|
/// - `Eve` knows `Alice`
|
|
/// - `Eve` knows `Bob`
|
|
///
|
|
/// The starting vertex will always be Alice.
|
|
///
|
|
/// Follow only outbound edges:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalOutbound}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "outbound"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Follow only inbound edges:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalInbound}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "inbound"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Follow any direction of edges:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalAny}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "any"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Excluding `Charlie` and `Bob`:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalFilterExclude}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "outbound", ';
|
|
/// body += '"filter" : "if (vertex.name === \\"Bob\\" || ';
|
|
/// body += 'vertex.name === \\"Charlie\\") {';
|
|
/// body += 'return \\"exclude\\";'
|
|
/// body += '}'
|
|
/// body += 'return;"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Do not follow edges from `Bob`:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalFilterPrune}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "outbound", ';
|
|
/// body += '"filter" : "if (vertex.name === \\"Bob\\") {';
|
|
/// body += 'return \\"prune\\";'
|
|
/// body += '}'
|
|
/// body += 'return;"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Visit only nodes in a depth of at least 2:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalMinDepth}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "outbound", ';
|
|
/// body += '"minDepth" : 2}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Visit only nodes in a depth of at most 1:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalMaxDepth}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "outbound", ';
|
|
/// body += '"maxDepth" : 1}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Count all visited nodes and return a list of nodes only:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalVisitorCountAndList}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "outbound", ';
|
|
/// body += '"init" : "result.visited = 0; result.myVertices = [ ];", ';
|
|
/// body += '"visitor" : "result.visited++; result.myVertices.push(vertex);"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Expand only inbound edges of `Alice` and outbound edges of `Eve`:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalVisitorExpander}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"expander" : ';
|
|
/// body += '"var connections = [ ];';
|
|
/// body += 'if (vertex.name === \\"Alice\\") {';
|
|
/// body += 'config.edgeCollection.inEdges(vertex).forEach(function (e) {';
|
|
/// body += 'connections.push({ vertex: require(\\"internal\\").db._document(e._from), edge: e });';
|
|
/// body += '});';
|
|
/// body += '}';
|
|
/// body += 'if (vertex.name === \\"Eve\\") {';
|
|
/// body += 'config.edgeCollection.outEdges(vertex).forEach(function (e) {';
|
|
/// body += 'connections.push({ vertex: require(\\"internal\\").db._document(e._to), edge: e });';
|
|
/// body += '});';
|
|
/// body += '}';
|
|
/// body += 'return connections;"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Follow the `depthfirst` strategy:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalDepthFirst}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "any", ';
|
|
/// body += '"strategy" : "depthfirst"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Using `postorder` ordering:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalPostorder}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "any", ';
|
|
/// body += '"order" : "postorder"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Using `backward` item-ordering:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalBackwardItemOrder}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "any", ';
|
|
/// body += '"itemOrder" : "backward"}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
///
|
|
/// Edges should only be included once globally,
|
|
/// but nodes are included every time they are visited:
|
|
///
|
|
/// @EXAMPLE_ARANGOSH_RUN{RestTraversalEdgeUniqueness}
|
|
/// var cv = "persons";
|
|
/// var ce = "knows";
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// var users = db._create(cv);
|
|
/// var knows = db._createEdgeCollection(ce);
|
|
/// var a = users.save({name: "Alice"})._id;
|
|
/// var b = users.save({name: "Bob"})._id;
|
|
/// var c = users.save({name: "Charlie"})._id;
|
|
/// var d = users.save({name: "Dave"})._id;
|
|
/// var e = users.save({name: "Eve"})._id;
|
|
/// knows.save(a, b, {});
|
|
/// knows.save(b, c, {});
|
|
/// knows.save(b, d, {});
|
|
/// knows.save(e, a, {});
|
|
/// knows.save(e, b, {});
|
|
/// var url = "/_api/traversal";
|
|
/// var body = '{ "startVertex": "' + a + '", ';
|
|
/// body += '"edgeCollection" : "' + knows.name() + '", ';
|
|
/// body += '"direction" : "any", ';
|
|
/// body += '"uniqueness" : {"vertices": "none", "edges": "global"}}';
|
|
///
|
|
/// var response = logCurlRequest('POST', url, body);
|
|
/// assert(response.code === 200);
|
|
///
|
|
/// logJsonResponse(response);
|
|
/// db._drop(cv);
|
|
/// db._drop(ce);
|
|
/// @END_EXAMPLE_ARANGOSH_RUN
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
function post_api_traversal(req, res) {
|
|
var json = actions.getJsonBody(req, res);
|
|
|
|
if (json === undefined) {
|
|
return badParam(req, res);
|
|
}
|
|
|
|
// check start vertex
|
|
// -----------------------------------------
|
|
|
|
if (json.startVertex === undefined ||
|
|
typeof json.startVertex !== "string") {
|
|
return badParam(req, res, "missing or invalid startVertex");
|
|
}
|
|
|
|
var doc;
|
|
try {
|
|
doc = db._document(json.startVertex);
|
|
}
|
|
catch (err) {
|
|
return notFound(req, res, arangodb.ERROR_ARANGO_DOCUMENT_NOT_FOUND, "invalid startVertex");
|
|
}
|
|
|
|
// check edge collection
|
|
// -----------------------------------------
|
|
|
|
if (json.edgeCollection === undefined ||
|
|
typeof json.edgeCollection !== "string") {
|
|
return badParam(req, res, "missing or invalid edgeCollection");
|
|
}
|
|
|
|
var edgeCollection;
|
|
try {
|
|
edgeCollection = db._collection(json.edgeCollection);
|
|
}
|
|
catch (err2) {
|
|
}
|
|
|
|
if (edgeCollection === undefined || edgeCollection == null) {
|
|
return notFound(req, res, arangodb.ERROR_ARANGO_COLLECTION_NOT_FOUND, "invalid edgeCollection");
|
|
}
|
|
|
|
// set up filters
|
|
// -----------------------------------------
|
|
|
|
var filters = [ ];
|
|
if (json.minDepth !== undefined) {
|
|
filters.push(traversal.minDepthFilter);
|
|
}
|
|
if (json.maxDepth !== undefined) {
|
|
filters.push(traversal.maxDepthFilter);
|
|
}
|
|
if (json.filter) {
|
|
try {
|
|
filters.push(new Function('config', 'vertex', 'path', json.filter));
|
|
}
|
|
catch (err3) {
|
|
return badParam(req, res, "invalid filter function");
|
|
}
|
|
}
|
|
|
|
// if no filter given, use the default filter (does nothing)
|
|
if (filters.length === 0) {
|
|
filters.push(traversal.visitAllFilter);
|
|
}
|
|
|
|
// set up visitor
|
|
// -----------------------------------------
|
|
|
|
var visitor;
|
|
|
|
if (json.visitor !== undefined) {
|
|
try {
|
|
visitor = new Function('config', 'result', 'vertex', 'path', json.visitor);
|
|
}
|
|
catch (err4) {
|
|
return badParam(req, res, "invalid visitor function");
|
|
}
|
|
}
|
|
else {
|
|
visitor = traversal.trackingVisitor;
|
|
}
|
|
|
|
// set up expander
|
|
// -----------------------------------------
|
|
|
|
var expander;
|
|
|
|
if (json.direction !== undefined) {
|
|
expander = validateArg(json.direction, {
|
|
'outbound': traversal.outboundExpander,
|
|
'inbound': traversal.inboundExpander,
|
|
'any': traversal.anyExpander
|
|
});
|
|
}
|
|
else if (json.expander !== undefined) {
|
|
try {
|
|
expander = new Function('config', 'vertex', 'path', json.expander);
|
|
}
|
|
catch (err5) {
|
|
return badParam(req, res, "invalid expander function");
|
|
}
|
|
}
|
|
|
|
if (expander === undefined) {
|
|
return badParam(req, res, "missing or invalid expander");
|
|
}
|
|
|
|
|
|
// assemble config object
|
|
// -----------------------------------------
|
|
|
|
var config = {
|
|
params: json,
|
|
edgeCollection: edgeCollection,
|
|
datasource: traversal.collectionDatasourceFactory(edgeCollection),
|
|
strategy: validateArg(json.strategy, {
|
|
'depthfirst': Traverser.DEPTH_FIRST,
|
|
'breadthfirst': Traverser.BREADTH_FIRST
|
|
}),
|
|
order: validateArg(json.order, {
|
|
'preorder': Traverser.PRE_ORDER,
|
|
'postorder': Traverser.POST_ORDER
|
|
}),
|
|
itemOrder: validateArg(json.itemOrder, {
|
|
'forward': Traverser.FORWARD,
|
|
'backward': Traverser.BACKWARD
|
|
}),
|
|
expander: expander,
|
|
visitor: visitor,
|
|
filter: filters,
|
|
minDepth: json.minDepth || 0,
|
|
maxDepth: json.maxDepth,
|
|
uniqueness: {
|
|
vertices: validateArg(json.uniqueness && json.uniqueness.vertices, {
|
|
'global': Traverser.UNIQUE_GLOBAL,
|
|
'none': Traverser.UNIQUE_NONE,
|
|
'path': Traverser.UNIQUE_PATH
|
|
}),
|
|
edges: validateArg(json.uniqueness && json.uniqueness.edges, {
|
|
'global': Traverser.UNIQUE_GLOBAL,
|
|
'none': Traverser.UNIQUE_NONE,
|
|
'path': Traverser.UNIQUE_PATH
|
|
})
|
|
}
|
|
};
|
|
|
|
// assemble result object
|
|
// -----------------------------------------
|
|
|
|
var result = {
|
|
visited: {
|
|
vertices: [ ],
|
|
paths: [ ]
|
|
}
|
|
};
|
|
|
|
if (json.init !== undefined) {
|
|
try {
|
|
var init = new Function('result', json.init);
|
|
init(result);
|
|
}
|
|
catch (err6) {
|
|
return badParam(req, res, "invalid init function");
|
|
}
|
|
}
|
|
|
|
// run the traversal
|
|
// -----------------------------------------
|
|
|
|
var traverser = new Traverser(config);
|
|
try {
|
|
traverser.traverse(result, doc);
|
|
actions.resultOk(req, res, actions.HTTP_OK, { result : result });
|
|
}
|
|
catch (err7) {
|
|
actions.resultException(req, res, err7, undefined, false);
|
|
}
|
|
}
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @}
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// -----------------------------------------------------------------------------
|
|
// --SECTION-- initialiser
|
|
// -----------------------------------------------------------------------------
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief gateway
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
actions.defineHttp({
|
|
url : "_api/traversal",
|
|
context : "api",
|
|
|
|
callback : function (req, res) {
|
|
try {
|
|
switch (req.requestType) {
|
|
case actions.POST:
|
|
post_api_traversal(req, res);
|
|
break;
|
|
|
|
default:
|
|
actions.resultUnsupported(req, res);
|
|
}
|
|
}
|
|
catch (err) {
|
|
actions.resultException(req, res, err);
|
|
}
|
|
}
|
|
});
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @}
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
// Local Variables:
|
|
// mode: outline-minor
|
|
// outline-regexp: "^\\(/// @brief\\|/// @addtogroup\\|// --SECTION--\\|/// @page\\|/// @}\\)"
|
|
// End:
|