forked from mattn/go-yql
/
yql.go
184 lines (160 loc) · 3.6 KB
/
yql.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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
package yql
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"errors"
"fmt"
oauth "github.com/akrennmair/goauth"
"io/ioutil"
"log"
"net/http"
"net/url"
"strings"
)
var (
yqlOauth *oauth.OAuthConsumer
YQL_URL string = "http://query.yahooapis.com/v1/public/yql"
)
func init() {
sql.Register("yql", &YQLDriver{})
}
type YQLDriver struct{}
func (d *YQLDriver) Open(dsn string) (driver.Conn, error) {
if len(dsn) > 1 {
parts := strings.Split(dsn, "|")
if len(parts) == 2 {
return &YQLConn{http.DefaultClient, parts[0], parts[1]}, nil
}
}
return &YQLConn{c: http.DefaultClient}, nil
}
type YQLConn struct {
c *http.Client
key string
secret string
}
func (c *YQLConn) Close() error {
c.c = nil
return nil
}
func (c *YQLConn) Begin() (driver.Tx, error) {
return nil, errors.New("Begin not supported")
}
func (c *YQLConn) Prepare(query string) (driver.Stmt, error) {
return &YQLStmt{c, query}, nil
}
type YQLStmt struct {
c *YQLConn
q string
}
func (s *YQLStmt) Close() error {
return nil
}
func (s *YQLStmt) NumInput() int {
return strings.Count(s.q, "?")
}
func (s *YQLStmt) bind(args []driver.Value) error {
b := s.q
for _, v := range args {
b = strings.Replace(b, "?", fmt.Sprintf("%q", v), 1)
}
s.q = b
return nil
}
func (s *YQLStmt) Query(args []driver.Value) (driver.Rows, error) {
if err := s.bind(args); err != nil {
return nil, err
}
var res *http.Response
var err error
if len(s.c.key) > 1 {
// secure
yqlOauth := &oauth.OAuthConsumer{
Service: "yql",
RequestTokenURL: "https://api.login.yahoo.com/oauth/v2/get_request_token",
AccessTokenURL: "https://api.login.yahoo.com/oauth/v2/get_token",
CallBackURL: "oob",
ConsumerKey: s.c.key,
ConsumerSecret: s.c.secret,
Type: oauth.TWOLEGGED,
Timeout: 5e9,
}
//log.Println("getting oauth? ", s.q)
//log.Println(yqlOauth)
p := oauth.Params{}
p.Add(&oauth.Pair{Key: "format", Value: "json"})
p.Add(&oauth.Pair{Key: "q", Value: s.q})
res, err = yqlOauth.Get(YQL_URL, p, nil)
if err != nil {
log.Println(err)
return nil, err
}
} else {
url := fmt.Sprintf("?q=%s&format=json", YQL_URL, url.QueryEscape(s.q))
//log.Println(url)
res, err = http.Get(url)
}
if err != nil {
return nil, err
}
defer res.Body.Close()
var data interface{}
b, err := ioutil.ReadAll(res.Body)
//log.Println(string(b))
err = json.Unmarshal(b, &data)
if err != nil {
return nil, errors.New(fmt.Sprintf("Invalid Json: %v", err))
}
if data == nil {
return nil, errors.New("Unsupported result")
}
var ok bool
data = data.(map[string]interface{})["query"]
if data == nil {
return nil, errors.New("Unsupported result")
}
data = data.(map[string]interface{})["results"]
if data == nil {
return nil, errors.New("Unsupported result")
}
results, ok := data.(map[string]interface{})
if !ok {
return nil, errors.New("Unsupported result")
}
for _, v := range results {
if vv, ok := v.([]interface{}); ok {
return &YQLRows{s, 0, vv}, nil
}
}
return nil, errors.New("Unsupported result")
}
type YQLResult struct {
s *YQLStmt
}
func (s *YQLStmt) Exec(args []driver.Value) (driver.Result, error) {
return nil, errors.New("Exec does not supported")
}
type YQLRows struct {
s *YQLStmt
n int
d []interface{}
}
func (rc *YQLRows) Close() error {
return nil
}
func (rc *YQLRows) Columns() []string {
return []string{"results"}
}
func (rc *YQLRows) Next(dest []driver.Value) error {
if rc.n == len(rc.d) {
return errors.New("EOF")
}
if s, ok := rc.d[rc.n].(string); ok {
dest[0] = s
} else {
dest[0] = rc.d[rc.n]
}
rc.n++
return nil
}