-
Notifications
You must be signed in to change notification settings - Fork 0
/
chaincode_select.go
41 lines (36 loc) · 1.04 KB
/
chaincode_select.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
package hlfq
import (
"fmt"
"github.com/antonmedv/expr"
"github.com/pkg/errors"
"github.com/s7techlab/cckit/router"
)
const selectQueryStringParam = "queryString"
// Select get elemets specified by CouchDB query
// arg1 =`queryString` - query in `expr` syntax
// returns error query syntax is invalid
func queueSelect(c router.Context) (interface{}, error) {
queryStr := c.ParamString(selectQueryStringParam)
res, err := queueListItems(c)
if err != nil {
return nil, errors.Wrap(err, "failed to read queue for Select")
}
items := res.([]QueueItem)
type env struct {
QueueItems []QueueItem
}
queryStr = fmt.Sprintf("filter(QueueItems, %s)", queryStr)
program, err := expr.Compile(queryStr, expr.Env(env{}))
if err != nil {
return nil, errors.Wrap(err, "queryString parse error")
}
progEnv := env{
QueueItems: items,
}
filteredItems, err := expr.Run(program, progEnv)
if err != nil {
return nil, errors.Wrap(err, "failed filter operation")
}
// fmt.Printf("***********filtered=%+v\n", filteredItems)
return filteredItems, nil
}