forked from araddon/qlbridge
-
Notifications
You must be signed in to change notification settings - Fork 0
/
results.go
271 lines (241 loc) · 6.34 KB
/
results.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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
package exec
import (
"database/sql/driver"
"io"
u "github.com/araddon/gou"
"github.com/araddon/qlbridge/datasource"
"github.com/araddon/qlbridge/plan"
"github.com/araddon/qlbridge/schema"
)
const (
MaxAllowedPacket = 1024 * 1024
)
var (
_ = u.EMPTY
// ensure our resultwriter implements database/sql/driver `driver.Rows`
_ driver.Rows = (*ResultWriter)(nil)
// Ensure that we implement the Task Runner interface
// required for usage as tasks in Executor
_ TaskRunner = (*ResultExecWriter)(nil)
_ TaskRunner = (*ResultWriter)(nil)
_ TaskRunner = (*ResultBuffer)(nil)
)
type (
// ResultExecWriter for writing tasks results
ResultExecWriter struct {
*TaskBase
closed bool
err error
rowsAffected int64
lastInsertID int64
}
// ResultWriter for writing tasks results
ResultWriter struct {
*TaskBase
closed bool
cols []string
}
// ResultBuffer for writing tasks results
ResultBuffer struct {
*TaskBase
closed bool
cols []string
}
)
// NewResultExecWriter a result writer for exect task
func NewResultExecWriter(ctx *plan.Context) *ResultExecWriter {
m := &ResultExecWriter{
TaskBase: NewTaskBase(ctx),
}
m.Handler = func(ctx *plan.Context, msg schema.Message) bool {
switch mt := msg.(type) {
case *datasource.SqlDriverMessage:
if len(mt.Vals) > 1 {
m.lastInsertID = mt.Vals[0].(int64)
m.rowsAffected = mt.Vals[1].(int64)
}
case nil:
u.Warnf("got nil")
// Signal to quit
return false
default:
u.Errorf("could not convert to message reader: %T", msg)
}
return true
}
return m
}
// NewResultWriter for a plan
func NewResultWriter(ctx *plan.Context) *ResultWriter {
m := &ResultWriter{
TaskBase: NewTaskBase(ctx),
}
m.Handler = resultWrite(m)
return m
}
// NewResultRows a resultwriter
func NewResultRows(ctx *plan.Context, cols []string) *ResultWriter {
stepper := NewTaskStepper(ctx)
m := &ResultWriter{
TaskBase: stepper.TaskBase,
cols: cols,
}
return m
}
// NewResultBuffer create a result buffer to write temp tasks into results.
func NewResultBuffer(ctx *plan.Context, writeTo *[]schema.Message) *ResultBuffer {
m := &ResultBuffer{
TaskBase: NewTaskBase(ctx),
}
m.Handler = func(ctx *plan.Context, msg schema.Message) bool {
*writeTo = append(*writeTo, msg)
//u.Infof("write to msgs: %v", len(*writeTo))
return true
}
return m
}
// Result of exec task
func (m *ResultExecWriter) Result() driver.Result {
return &qlbResult{m.lastInsertID, m.rowsAffected, m.err}
}
// Copy exec task
func (m *ResultExecWriter) Copy() *ResultExecWriter { return NewResultExecWriter(m.Ctx) }
// Close exect task
func (m *ResultExecWriter) Close() error {
//u.Debugf("%p ResultExecWriter.Close()???? already closed?%v", m, m.closed)
m.Lock()
if m.closed {
m.Unlock()
return nil
}
m.closed = true
m.Unlock()
return m.TaskBase.Close()
}
// Copy result writter
func (m *ResultWriter) Copy() *ResultWriter { return NewResultWriter(m.Ctx) }
// Close ResultWriter
func (m *ResultWriter) Close() error {
//u.Debugf("%p ResultWriter.Close()???? already closed?%v", m, m.closed)
m.Lock()
if m.closed {
m.Unlock()
return nil
}
m.closed = true
m.Unlock()
return m.TaskBase.Close()
}
// Copy the result buffer
func (m *ResultBuffer) Copy() *ResultBuffer { return NewResultBuffer(m.Ctx, nil) }
// Close the ResultBuffer
func (m *ResultBuffer) Close() error {
//u.Debugf("%p ResultBuffer.Close()???? already closed?%v", m, m.closed)
m.Lock()
if m.closed {
m.Unlock()
return nil
}
m.closed = true
m.Unlock()
return m.TaskBase.Close()
}
// Next his is implementation of the sql/driver Rows() Next() interface
func (m *ResultWriter) Next(dest []driver.Value) error {
select {
case <-m.SigChan():
return ErrShuttingDown
case err := <-m.ErrChan():
return err
case msg, ok := <-m.MessageIn():
if !ok {
return io.EOF
}
if msg == nil {
return io.EOF
}
return msgToRow(msg, m.cols, dest)
}
}
// Run For ResultWriter, since we are are not paging through messages
// using this mesage channel, instead using Next() as defined by sql/driver
// we don't read the input channel, just watch stop channels
func (m *ResultWriter) Run() error {
defer m.Ctx.Recover()
defer func() {
close(m.msgOutCh) // closing output channels is the signal to stop
}()
select {
case err := <-m.errCh:
u.Errorf("got error: %v", err)
return err
case <-m.sigCh:
// u.Debugf("%p got resultwriter.Run() sigquit?", m)
return nil
}
}
// Columns list of column names
func (m *ResultWriter) Columns() []string {
return m.cols
}
func resultWrite(m *ResultWriter) MessageHandler {
out := m.MessageOut()
return func(ctx *plan.Context, msg schema.Message) bool {
// if _, ok := msg.Body().(expr.ContextReader); !ok {
// u.Errorf("could not convert to message reader: %T", msg.Body())
// }
select {
case out <- msg:
return true
case <-m.SigChan():
return false
}
}
}
func msgToRow(msg schema.Message, cols []string, dest []driver.Value) error {
//u.Debugf("msg? %v %T \n%p %v", msg, msg, dest, dest)
switch mt := msg.Body().(type) {
/*
case *datasource.ContextUrlValues:
for i, key := range cols {
if val, ok := mt.Get(key); ok && !val.Nil() {
dest[i] = val.Value()
//u.Infof("key=%v val=%v", key, val)
} else {
u.Warnf("missing value? %v %T %v", key, val.Value(), val.Value())
}
}
//u.Debugf("got msg in row result writer: %#v", mt)
case *datasource.ContextSimple:
for i, key := range cols {
//u.Debugf("key=%v mt = nil? %v", key, mt)
if val, ok := mt.Get(key); ok && val != nil && !val.Nil() {
dest[i] = val.Value()
//u.Infof("key=%v val=%v", key, val)
} else if val == nil {
u.Errorf("could not evaluate? %v %#v", key, mt)
} else {
u.Warnf("missing value? %v %T %v", key, val.Value(), val.Value())
}
}
//u.Debugf("got msg in row result writer: %#v", dest)
*/
case *datasource.SqlDriverMessageMap:
for i, key := range cols {
val, ok := mt.Get(key)
//u.Debugf("key=%v %T %v", key, val, val)
if ok && val != nil && !val.Nil() {
dest[i] = val.Value()
//u.Infof("key=%v val=%v", key, val)
} else if val == nil {
u.Errorf("could not evaluate? %v %#v", key, mt)
} else {
u.Warnf("missing value? %v %T %v", key, val.Value(), val.Value())
}
}
//u.Debugf("got msg in row result writer: %#v", dest)
default:
u.Errorf("unknown message type: %T", mt)
}
return nil
}