forked from cayleygraph/cayley
-
Notifications
You must be signed in to change notification settings - Fork 0
/
session.go
144 lines (130 loc) · 3.42 KB
/
session.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
// Copyright 2014 The Cayley Authors. All rights reserved.
//
// 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.
package mql
import (
"encoding/json"
"fmt"
"sort"
"github.com/barakmich/glog"
"github.com/google/cayley/graph"
"github.com/google/cayley/graph/iterator"
"github.com/google/cayley/query"
)
type Session struct {
qs graph.QuadStore
currentQuery *Query
debug bool
}
func NewSession(qs graph.QuadStore) *Session {
var m Session
m.qs = qs
return &m
}
func (s *Session) Debug(ok bool) {
s.debug = ok
}
func (s *Session) ShapeOf(query string) (interface{}, error) {
var mqlQuery interface{}
err := json.Unmarshal([]byte(query), &mqlQuery)
if err != nil {
return nil, err
}
s.currentQuery = NewQuery(s)
s.currentQuery.BuildIteratorTree(mqlQuery)
output := make(map[string]interface{})
iterator.OutputQueryShapeForIterator(s.currentQuery.it, s.qs, output)
nodes := make([]iterator.Node, 0)
for _, n := range output["nodes"].([]iterator.Node) {
n.Tags = nil
nodes = append(nodes, n)
}
output["nodes"] = nodes
return output, nil
}
func (s *Session) Parse(input string) (query.ParseResult, error) {
var x interface{}
err := json.Unmarshal([]byte(input), &x)
if err != nil {
return query.ParseFail, err
}
return query.Parsed, nil
}
func (s *Session) Execute(input string, c chan interface{}, _ int) {
defer close(c)
var mqlQuery interface{}
err := json.Unmarshal([]byte(input), &mqlQuery)
if err != nil {
return
}
s.currentQuery = NewQuery(s)
s.currentQuery.BuildIteratorTree(mqlQuery)
if s.currentQuery.isError() {
return
}
it, _ := s.currentQuery.it.Optimize()
if glog.V(2) {
b, err := json.MarshalIndent(it.Describe(), "", " ")
if err != nil {
glog.Infof("failed to format description: %v", err)
} else {
glog.Infof("%s", b)
}
}
for graph.Next(it) {
tags := make(map[string]graph.Value)
it.TagResults(tags)
c <- tags
for it.NextPath() == true {
tags := make(map[string]graph.Value)
it.TagResults(tags)
c <- tags
}
}
}
func (s *Session) Format(result interface{}) string {
tags := result.(map[string]graph.Value)
out := fmt.Sprintln("****")
tagKeys := make([]string, len(tags))
s.currentQuery.treeifyResult(tags)
s.currentQuery.buildResults()
r, _ := json.MarshalIndent(s.currentQuery.results, "", " ")
fmt.Println(string(r))
i := 0
for k := range tags {
tagKeys[i] = string(k)
i++
}
sort.Strings(tagKeys)
for _, k := range tagKeys {
if k == "$_" {
continue
}
out += fmt.Sprintf("%s : %s\n", k, s.qs.NameOf(tags[k]))
}
return out
}
func (s *Session) Collate(result interface{}) {
s.currentQuery.treeifyResult(result.(map[string]graph.Value))
}
func (s *Session) Results() (interface{}, error) {
s.currentQuery.buildResults()
if s.currentQuery.isError() {
return nil, s.currentQuery.err
}
return s.currentQuery.results, nil
}
func (s *Session) Clear() {
// Since we create a new Query underneath every query, clearing isn't necessary.
return
}