forked from redpanda-data/connect
-
Notifications
You must be signed in to change notification settings - Fork 0
/
metadata.go
213 lines (177 loc) · 5.6 KB
/
metadata.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
package processor
import (
"fmt"
"strings"
"time"
"github.com/dafanshu/benthos/v3/internal/bloblang/field"
"github.com/dafanshu/benthos/v3/internal/docs"
"github.com/dafanshu/benthos/v3/internal/interop"
"github.com/dafanshu/benthos/v3/internal/tracing"
"github.com/dafanshu/benthos/v3/lib/log"
"github.com/dafanshu/benthos/v3/lib/metrics"
"github.com/dafanshu/benthos/v3/lib/types"
)
//------------------------------------------------------------------------------
func init() {
Constructors[TypeMetadata] = TypeSpec{
constructor: NewMetadata,
Status: docs.StatusDeprecated,
Footnotes: `
## Alternatives
All functionality of this processor has been superseded by the
[bloblang](/docs/components/processors/bloblang) processor.`,
FieldSpecs: docs.FieldSpecs{
docs.FieldCommon("operator", "The operator to apply to messages.").HasOptions("set", "delete", "delete_all", "delete_prefix"),
docs.FieldCommon("key", "The metadata key to target with the chosen operator.").IsInterpolated(),
docs.FieldCommon("value", "The metadata value to use with the chosen operator.").IsInterpolated(),
PartsFieldSpec,
},
}
}
//------------------------------------------------------------------------------
// MetadataConfig contains configuration fields for the Metadata processor.
type MetadataConfig struct {
Parts []int `json:"parts" yaml:"parts"`
Operator string `json:"operator" yaml:"operator"`
Key string `json:"key" yaml:"key"`
Value string `json:"value" yaml:"value"`
}
// NewMetadataConfig returns a MetadataConfig with default values.
func NewMetadataConfig() MetadataConfig {
return MetadataConfig{
Parts: []int{},
Operator: "set",
Key: "example",
Value: `${!hostname()}`,
}
}
//------------------------------------------------------------------------------
type metadataOperator func(m types.Metadata, key, value string) error
func newMetadataSetOperator() metadataOperator {
return func(m types.Metadata, key, value string) error {
m.Set(key, value)
return nil
}
}
func newMetadataDeleteAllOperator() metadataOperator {
return func(m types.Metadata, key, value string) error {
m.Iter(func(k, _ string) error {
m.Delete(k)
return nil
})
return nil
}
}
func newMetadataDeleteOperator() metadataOperator {
return func(m types.Metadata, key, value string) error {
target := value
if target == "" && len(key) > 0 {
target = key
}
m.Delete(target)
return nil
}
}
func newMetadataDeletePrefixOperator() metadataOperator {
return func(m types.Metadata, key, value string) error {
prefix := value
if prefix == "" && len(key) > 0 {
prefix = key
}
m.Iter(func(k, _ string) error {
if strings.HasPrefix(k, prefix) {
m.Delete(k)
}
return nil
})
return nil
}
}
func getMetadataOperator(opStr string) (metadataOperator, error) {
switch opStr {
case "set":
return newMetadataSetOperator(), nil
case "delete":
return newMetadataDeleteOperator(), nil
case "delete_all":
return newMetadataDeleteAllOperator(), nil
case "delete_prefix":
return newMetadataDeletePrefixOperator(), nil
}
return nil, fmt.Errorf("operator not recognised: %v", opStr)
}
//------------------------------------------------------------------------------
// Metadata is a processor that performs an operation on the Metadata of a
// message.
type Metadata struct {
value *field.Expression
key *field.Expression
operator metadataOperator
parts []int
conf Config
log log.Modular
stats metrics.Type
mCount metrics.StatCounter
mErr metrics.StatCounter
mSent metrics.StatCounter
mBatchSent metrics.StatCounter
}
// NewMetadata returns a Metadata processor.
func NewMetadata(
conf Config, mgr types.Manager, log log.Modular, stats metrics.Type,
) (Type, error) {
value, err := interop.NewBloblangField(mgr, conf.Metadata.Value)
if err != nil {
return nil, fmt.Errorf("failed to parse value expression: %v", err)
}
key, err := interop.NewBloblangField(mgr, conf.Metadata.Key)
if err != nil {
return nil, fmt.Errorf("failed to parse key expression: %v", err)
}
m := &Metadata{
conf: conf,
log: log,
stats: stats,
parts: conf.Metadata.Parts,
value: value,
key: key,
mCount: stats.GetCounter("count"),
mErr: stats.GetCounter("error"),
mSent: stats.GetCounter("sent"),
mBatchSent: stats.GetCounter("batch.sent"),
}
if m.operator, err = getMetadataOperator(conf.Metadata.Operator); err != nil {
return nil, err
}
return m, nil
}
//------------------------------------------------------------------------------
// ProcessMessage applies the processor to a message, either creating >0
// resulting messages or a response to be sent back to the message source.
func (p *Metadata) ProcessMessage(msg types.Message) ([]types.Message, types.Response) {
p.mCount.Incr(1)
newMsg := msg.Copy()
proc := func(index int, span *tracing.Span, part types.Part) error {
key := p.key.StringLegacy(index, msg)
value := p.value.StringLegacy(index, msg)
if err := p.operator(part.Metadata(), key, value); err != nil {
p.mErr.Incr(1)
p.log.Debugf("Failed to apply operator: %v\n", err)
return err
}
return nil
}
IteratePartsWithSpanV2(TypeMetadata, p.parts, newMsg, proc)
msgs := [1]types.Message{newMsg}
p.mBatchSent.Incr(1)
p.mSent.Incr(int64(newMsg.Len()))
return msgs[:], nil
}
// CloseAsync shuts down the processor and stops processing requests.
func (p *Metadata) CloseAsync() {
}
// WaitForClose blocks until the processor has closed down.
func (p *Metadata) WaitForClose(timeout time.Duration) error {
return nil
}
//------------------------------------------------------------------------------