-
Notifications
You must be signed in to change notification settings - Fork 0
/
selector.go
104 lines (91 loc) · 3.47 KB
/
selector.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
// Copyright 2018 StreamSets Inc.
// 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 selector
import (
"context"
"errors"
"fmt"
log "github.com/sirupsen/logrus"
"github.com/streamsets/datacollector-edge/api"
"github.com/streamsets/datacollector-edge/api/validation"
"github.com/streamsets/datacollector-edge/container/common"
"github.com/streamsets/datacollector-edge/container/el"
"github.com/streamsets/datacollector-edge/container/util"
"github.com/streamsets/datacollector-edge/stages/stagelibrary"
)
const (
LIBRARY = "streamsets-datacollector-basic-lib"
STAGE_NAME = "com_streamsets_pipeline_stage_processor_selector_SelectorDProcessor"
VERSION = 1
OUTPUT_LANE = "outputLane"
PREDICATE = "predicate"
SELECTOR_02_ERROR = "The Stream Selector does not define the output stream '%s' associated with condition '%s'"
SELECTOR_07_ERROR = "The last condition must be 'default'"
DEFAULT = "default"
)
type SelectorProcessor struct {
*common.BaseStage
LanePredicates []map[string]string `ConfigDef:"type=MODEL,evaluation=EXPLICIT" PredicateModel:"name=lanePredicates"`
defaultLane string
}
func init() {
stagelibrary.SetCreator(LIBRARY, STAGE_NAME, func() api.Stage {
return &SelectorProcessor{BaseStage: &common.BaseStage{}}
})
}
func (s *SelectorProcessor) Init(stageContext api.StageContext) []validation.Issue {
issues := s.BaseStage.Init(stageContext)
err := s.parsePredicateLanes()
if err != nil {
issues = append(issues, stageContext.CreateConfigIssue(err.Error()))
return issues
}
if s.LanePredicates[len(s.LanePredicates)-1][PREDICATE] != DEFAULT {
issues = append(issues, stageContext.CreateConfigIssue(SELECTOR_07_ERROR))
return issues
} else {
s.defaultLane = s.LanePredicates[len(s.LanePredicates)-1][OUTPUT_LANE]
}
return issues
}
func (s *SelectorProcessor) parsePredicateLanes() error {
for _, predicateLaneMap := range s.LanePredicates {
if !util.Contains(s.GetStageContext().GetOutputLanes(), predicateLaneMap[OUTPUT_LANE]) {
return errors.New(fmt.Sprintf(SELECTOR_02_ERROR, predicateLaneMap[OUTPUT_LANE], predicateLaneMap[PREDICATE]))
}
}
return nil
}
func (s *SelectorProcessor) Process(batch api.Batch, batchMaker api.BatchMaker) error {
for _, record := range batch.GetRecords() {
recordContext := context.WithValue(context.Background(), el.RecordContextVar, record)
matchedAtLeastOnePredicate := false
for _, predicateLaneMap := range s.LanePredicates {
if predicateLaneMap[OUTPUT_LANE] != s.defaultLane {
evaluateRes, err := s.GetStageContext().Evaluate(predicateLaneMap[PREDICATE], PREDICATE, recordContext)
if err != nil {
log.WithError(err).Error("Error evaluating record")
s.GetStageContext().ToError(err, record)
}
if evaluateRes.(bool) {
matchedAtLeastOnePredicate = true
batchMaker.AddRecord(record, predicateLaneMap[OUTPUT_LANE])
}
}
}
if !matchedAtLeastOnePredicate {
batchMaker.AddRecord(record, s.defaultLane)
}
}
return nil
}