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121 lines
2.7 KiB
121 lines
2.7 KiB
9 years ago
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// Copyright 2014 The Cayley Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gremlin
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// Builds a new Gremlin environment pointing at a session.
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import (
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"sync"
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"github.com/barakmich/glog"
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"github.com/robertkrimen/otto"
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"github.com/google/cayley/graph"
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)
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type worker struct {
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qs graph.QuadStore
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env *otto.Otto
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sync.Mutex
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results chan interface{}
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shape map[string]interface{}
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count int
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limit int
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kill <-chan struct{}
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}
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func newWorker(qs graph.QuadStore) *worker {
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env := otto.New()
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wk := &worker{
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qs: qs,
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env: env,
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limit: -1,
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}
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graph, _ := env.Object("graph = {}")
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env.Run("g = graph")
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graph.Set("Vertex", func(call otto.FunctionCall) otto.Value {
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call.Otto.Run("var out = {}")
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out, err := call.Otto.Object("out")
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if err != nil {
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glog.Error(err.Error())
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return otto.TrueValue()
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}
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out.Set("_gremlin_type", "vertex")
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args := argsOf(call)
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if len(args) > 0 {
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out.Set("string_args", args)
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}
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wk.embedTraversals(env, out)
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wk.embedFinals(env, out)
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return out.Value()
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})
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env.Run("graph.V = graph.Vertex")
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graph.Set("Morphism", func(call otto.FunctionCall) otto.Value {
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call.Otto.Run("var out = {}")
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out, _ := call.Otto.Object("out")
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out.Set("_gremlin_type", "morphism")
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wk.embedTraversals(env, out)
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return out.Value()
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})
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env.Run("graph.M = graph.Morphism")
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graph.Set("Emit", func(call otto.FunctionCall) otto.Value {
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value := call.Argument(0)
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if value.IsDefined() {
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wk.send(&Result{val: &value})
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}
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return otto.NullValue()
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})
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return wk
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}
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func (wk *worker) wantShape() bool {
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return wk.shape != nil
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}
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func argsOf(call otto.FunctionCall) []string {
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var out []string
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for _, arg := range call.ArgumentList {
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if arg.IsString() {
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out = append(out, arg.String())
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}
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if arg.IsObject() && arg.Class() == "Array" {
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obj, _ := arg.Export()
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for _, x := range obj.([]interface{}) {
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out = append(out, x.(string))
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}
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}
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}
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return out
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}
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func isVertexChain(obj *otto.Object) bool {
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val, _ := obj.Get("_gremlin_type")
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if val.String() == "vertex" {
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return true
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}
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val, _ = obj.Get("_gremlin_prev")
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if val.IsObject() {
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return isVertexChain(val.Object())
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}
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return false
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}
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