-
Notifications
You must be signed in to change notification settings - Fork 453
/
scalar.go
124 lines (107 loc) · 3.47 KB
/
scalar.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
// Copyright (c) 2018 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package scalar
import (
"github.com/m3db/m3/src/query/block"
"github.com/m3db/m3/src/query/executor/transform"
"github.com/m3db/m3/src/query/models"
"github.com/m3db/m3/src/query/parser"
"github.com/m3db/m3/src/query/util/logging"
"go.uber.org/zap"
)
const (
// ScalarType is a scalar series.
ScalarType = "scalar"
// VectorType is a vector series.
VectorType = "vector"
// TimeType returns the number of seconds since January 1, 1970 UTC.
//
// NB: this does not actually return the current time, but the time at
// which the expression is to be evaluated.
TimeType = "time"
)
// ScalarOp is a scalar operation representing a constant.
type ScalarOp struct {
val float64
tagOptions models.TagOptions
}
// Value is the constant value for thes scalar operation.
func (o ScalarOp) Value() float64 {
return o.val
}
// OpType is the operation type of the scalar operation.
func (o ScalarOp) OpType() string {
return ScalarType
}
// String is the string representation of the scalar operation.
func (o ScalarOp) String() string {
return "type: scalar"
}
// Node returns this scalar operation's execution node.
func (o ScalarOp) Node(
controller *transform.Controller,
opts transform.Options,
) parser.Source {
return &scalarNode{
op: o,
controller: controller,
opts: opts,
}
}
// NewScalarOp creates an operation that yields a scalar source.
func NewScalarOp(
val float64,
tagOptions models.TagOptions,
) (parser.Params, error) {
return &ScalarOp{
val: val,
tagOptions: tagOptions,
}, nil
}
// scalarNode is the execution node for time source.
type scalarNode struct {
op ScalarOp
controller *transform.Controller
opts transform.Options
}
// Execute runs the scalar source's pipeline.
func (n *scalarNode) Execute(queryCtx *models.QueryContext) error {
meta := block.Metadata{
Bounds: n.opts.TimeSpec().Bounds(),
Tags: models.NewTags(0, n.op.tagOptions),
ResultMetadata: block.NewResultMetadata(),
}
block := block.NewScalar(n.op.val, meta)
if n.opts.Debug() {
// Ignore any errors
iter, _ := block.StepIter()
if iter != nil {
logging.WithContext(queryCtx.Ctx, n.opts.InstrumentOptions()).
Info("scalar node", zap.Any("meta", block.Meta()))
}
}
if err := n.controller.Process(queryCtx, block); err != nil {
block.Close()
// Fail on first error
return err
}
block.Close()
return nil
}