/
function.go
177 lines (155 loc) · 8.13 KB
/
function.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
package reduce
import (
"github.com/go-graphite/carbonapi/expr/helper"
"github.com/go-graphite/carbonapi/expr/interfaces"
"github.com/go-graphite/carbonapi/expr/types"
"github.com/go-graphite/carbonapi/pkg/parser"
"strings"
)
type reduce struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(configFile string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &reduce{}
functions := []string{"reduceSeries", "reduce"}
for _, n := range functions {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
func (f *reduce) Do(e parser.Expr, from, until int32, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
const matchersStartIndex = 3
if len(e.Args()) < matchersStartIndex+1 {
return nil, parser.ErrMissingArgument
}
seriesList, err := helper.GetSeriesArg(e.Args()[0], from, until, values)
if err != nil {
return nil, err
}
reduceFunction, err := e.GetStringArg(1)
if err != nil {
return nil, err
}
reduceNode, err := e.GetIntArg(2)
if err != nil {
return nil, err
}
argsCount := len(e.Args())
matchersCount := argsCount - matchersStartIndex
reduceMatchers := make([]string, matchersCount)
for i := matchersStartIndex; i < argsCount; i++ {
reduceMatcher, err := e.GetStringArg(i)
if err != nil {
return nil, err
}
reduceMatchers[i-matchersStartIndex] = reduceMatcher
}
var results []*types.MetricData
reduceGroups := make(map[string]map[string]*types.MetricData)
reducedValues := values
var aliasNames []string
for _, series := range seriesList {
metric := helper.ExtractMetric(series.Name)
nodes := strings.Split(metric, ".")
reduceNodeKey := nodes[reduceNode]
nodes[reduceNode] = "reduce." + reduceFunction
aliasName := strings.Join(nodes, ".")
_, exist := reduceGroups[aliasName]
if !exist {
reduceGroups[aliasName] = make(map[string]*types.MetricData)
aliasNames = append(aliasNames, aliasName)
}
reduceGroups[aliasName][reduceNodeKey] = series
valueKey := parser.MetricRequest{series.Name, from, until}
reducedValues[valueKey] = append(reducedValues[valueKey], series)
}
AliasLoop:
for _, aliasName := range aliasNames {
reducedNodes := make([]parser.Expr, len(reduceMatchers))
for i, reduceMatcher := range reduceMatchers {
matched, ok := reduceGroups[aliasName][reduceMatcher]
if !ok {
continue AliasLoop
}
reducedNodes[i] = parser.NewTargetExpr(matched.Name)
}
result, err := f.Evaluator.EvalExpr(parser.NewExprTyped("alias", []parser.Expr{
parser.NewExprTyped(reduceFunction, reducedNodes),
parser.NewValueExpr(aliasName),
}), from, until, reducedValues)
if err != nil {
return nil, err
}
results = append(results, result...)
}
return results, nil
}
// Description is auto-generated description, based on output of https://github.com/graphite-project/graphite-web
func (f *reduce) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"reduceSeries": {
Description: "Short form: ``reduce()``\n\nTakes a list of seriesLists and reduces it to a list of series by means of the reduceFunction.\n\nReduction is performed by matching the reduceNode in each series against the list of\nreduceMatchers. Then each series is passed to the reduceFunction as arguments in the order\ngiven by reduceMatchers. The reduceFunction should yield a single series.\n\nThe resulting list of series are aliased so that they can easily be nested in other functions.\n\n**Example**: Map/Reduce asPercent(bytes_used,total_bytes) for each server\n\nAssume that metrics in the form below exist:\n\n.. code-block:: none\n\n servers.server1.disk.bytes_used\n servers.server1.disk.total_bytes\n servers.server2.disk.bytes_used\n servers.server2.disk.total_bytes\n servers.server3.disk.bytes_used\n servers.server3.disk.total_bytes\n ...\n servers.serverN.disk.bytes_used\n servers.serverN.disk.total_bytes\n\nTo get the percentage of disk used for each server:\n\n.. code-block:: none\n\n reduceSeries(mapSeries(servers.*.disk.*,1),\"asPercent\",3,\"bytes_used\",\"total_bytes\") =>\n\n alias(asPercent(servers.server1.disk.bytes_used,servers.server1.disk.total_bytes),\"servers.server1.disk.reduce.asPercent\"),\n alias(asPercent(servers.server2.disk.bytes_used,servers.server2.disk.total_bytes),\"servers.server2.disk.reduce.asPercent\"),\n alias(asPercent(servers.server3.disk.bytes_used,servers.server3.disk.total_bytes),\"servers.server3.disk.reduce.asPercent\"),\n ...\n alias(asPercent(servers.serverN.disk.bytes_used,servers.serverN.disk.total_bytes),\"servers.serverN.disk.reduce.asPercent\")\n\nIn other words, we will get back the following metrics::\n\n servers.server1.disk.reduce.asPercent\n servers.server2.disk.reduce.asPercent\n servers.server3.disk.reduce.asPercent\n ...\n servers.serverN.disk.reduce.asPercent\n\n.. seealso:: :py:func:`mapSeries`",
Function: "reduceSeries(seriesLists, reduceFunction, reduceNode, *reduceMatchers)",
Group: "Combine",
Module: "graphite.render.functions",
Name: "reduceSeries",
Params: []types.FunctionParam{
{
Name: "seriesLists",
Required: true,
Type: types.SeriesLists,
},
{
Name: "reduceFunction",
Required: true,
Type: types.String,
},
{
Name: "reduceNode",
Required: true,
Type: types.Node,
},
{
Multiple: true,
Name: "reduceMatchers",
Required: true,
Type: types.String,
},
},
},
"reduce": {
Description: "Short form: ``reduce()``\n\nTakes a list of seriesLists and reduces it to a list of series by means of the reduceFunction.\n\nReduction is performed by matching the reduceNode in each series against the list of\nreduceMatchers. Then each series is passed to the reduceFunction as arguments in the order\ngiven by reduceMatchers. The reduceFunction should yield a single series.\n\nThe resulting list of series are aliased so that they can easily be nested in other functions.\n\n**Example**: Map/Reduce asPercent(bytes_used,total_bytes) for each server\n\nAssume that metrics in the form below exist:\n\n.. code-block:: none\n\n servers.server1.disk.bytes_used\n servers.server1.disk.total_bytes\n servers.server2.disk.bytes_used\n servers.server2.disk.total_bytes\n servers.server3.disk.bytes_used\n servers.server3.disk.total_bytes\n ...\n servers.serverN.disk.bytes_used\n servers.serverN.disk.total_bytes\n\nTo get the percentage of disk used for each server:\n\n.. code-block:: none\n\n reduceSeries(mapSeries(servers.*.disk.*,1),\"asPercent\",3,\"bytes_used\",\"total_bytes\") =>\n\n alias(asPercent(servers.server1.disk.bytes_used,servers.server1.disk.total_bytes),\"servers.server1.disk.reduce.asPercent\"),\n alias(asPercent(servers.server2.disk.bytes_used,servers.server2.disk.total_bytes),\"servers.server2.disk.reduce.asPercent\"),\n alias(asPercent(servers.server3.disk.bytes_used,servers.server3.disk.total_bytes),\"servers.server3.disk.reduce.asPercent\"),\n ...\n alias(asPercent(servers.serverN.disk.bytes_used,servers.serverN.disk.total_bytes),\"servers.serverN.disk.reduce.asPercent\")\n\nIn other words, we will get back the following metrics::\n\n servers.server1.disk.reduce.asPercent\n servers.server2.disk.reduce.asPercent\n servers.server3.disk.reduce.asPercent\n ...\n servers.serverN.disk.reduce.asPercent\n\n.. seealso:: :py:func:`mapSeries`",
Function: "reduce(seriesLists, reduceFunction, reduceNode, *reduceMatchers)",
Group: "Combine",
Module: "graphite.render.functions",
Name: "reduce",
Params: []types.FunctionParam{
{
Name: "seriesLists",
Required: true,
Type: types.SeriesLists,
},
{
Name: "reduceFunction",
Required: true,
Type: types.String,
},
{
Name: "reduceNode",
Required: true,
Type: types.Node,
},
{
Multiple: true,
Name: "reduceMatchers",
Required: true,
Type: types.String,
},
},
},
}
}