/
function.go
199 lines (179 loc) · 6.51 KB
/
function.go
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package groupByNode
import (
"fmt"
"github.com/bookingcom/carbonapi/expr/helper"
"github.com/bookingcom/carbonapi/expr/interfaces"
"github.com/bookingcom/carbonapi/expr/types"
"github.com/bookingcom/carbonapi/pkg/parser"
"strings"
)
type groupByNode struct {
interfaces.FunctionBase
}
func GetOrder() interfaces.Order {
return interfaces.Any
}
func New(configFile string) []interfaces.FunctionMetadata {
res := make([]interfaces.FunctionMetadata, 0)
f := &groupByNode{}
functions := []string{"groupByNode", "groupByNodes"}
for _, n := range functions {
res = append(res, interfaces.FunctionMetadata{Name: n, F: f})
}
return res
}
// groupByNode(seriesList, nodeNum, callback)
// groupByNodes(seriesList, callback, *nodes)
func (f *groupByNode) Do(e parser.Expr, from, until int32, values map[parser.MetricRequest][]*types.MetricData) ([]*types.MetricData, error) {
args, err := helper.GetSeriesArg(e.Args()[0], from, until, values)
if err != nil {
return nil, err
}
var callback string
var fields []int
if e.Target() == "groupByNode" {
field, err := e.GetIntArg(1)
if err != nil {
return nil, err
}
callback, err = e.GetStringArg(2)
if err != nil {
return nil, err
}
fields = []int{field}
} else {
callback, err = e.GetStringArg(1)
if err != nil {
return nil, err
}
fields, err = e.GetIntArgs(2)
if err != nil {
return nil, err
}
}
var results []*types.MetricData
groups := make(map[string][]*types.MetricData)
nodeList := []string{}
for _, a := range args {
metric := helper.ExtractMetric(a.Name)
nodes := strings.Split(metric, ".")
nodeKey := make([]string, 0, len(fields))
for _, f := range fields {
nodeKey = append(nodeKey, nodes[f])
}
node := strings.Join(nodeKey, ".")
if len(groups[node]) == 0 {
nodeList = append(nodeList, node)
}
groups[node] = append(groups[node], a)
}
for _, k := range nodeList {
k := k // k's reference is used later, so it's important to make it unique per loop
v := groups[k]
// Ensure that names won't be parsed as consts, appending stub to them
expr := fmt.Sprintf("%s(stub_%s)", callback, k)
// create a stub context to evaluate the callback in
nexpr, _, err := parser.ParseExpr(expr)
// remove all stub_ prefixes we've prepended before
nexpr.SetRawArgs(strings.Replace(nexpr.RawArgs(), "stub_", "", 1))
for argIdx := range nexpr.Args() {
nexpr.Args()[argIdx].SetTarget(strings.Replace(nexpr.Args()[0].Target(), "stub_", "", 1))
}
if err != nil {
return nil, err
}
nvalues := values
if e.Target() == "groupByNode" || e.Target() == "groupByNodes" {
nvalues = map[parser.MetricRequest][]*types.MetricData{
parser.MetricRequest{k, from, until}: v,
}
}
r, _ := f.Evaluator.EvalExpr(nexpr, from, until, nvalues)
if r != nil {
r[0].Name = k
results = append(results, r...)
}
}
return results, nil
}
// Description is auto-generated description, based on output of https://github.com/graphite-project/graphite-web
func (f *groupByNode) Description() map[string]types.FunctionDescription {
return map[string]types.FunctionDescription{
"groupByNode": {
Description: "Takes a serieslist and maps a callback to subgroups within as defined by a common node\n\n.. code-block:: none\n\n &target=groupByNode(ganglia.by-function.*.*.cpu.load5,2,\"sumSeries\")\n\nWould return multiple series which are each the result of applying the \"sumSeries\" function\nto groups joined on the second node (0 indexed) resulting in a list of targets like\n\n.. code-block :: none\n\n sumSeries(ganglia.by-function.server1.*.cpu.load5),sumSeries(ganglia.by-function.server2.*.cpu.load5),...\n\nNode may be an integer referencing a node in the series name or a string identifying a tag.\n\nThis is an alias for using :py:func:`groupByNodes <groupByNodes>` with a single node.",
Function: "groupByNode(seriesList, nodeNum, callback='average')",
Group: "Combine",
Module: "graphite.render.functions",
Name: "groupByNode",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
{
Name: "nodeNum",
Required: true,
Type: types.NodeOrTag,
},
{
Default: types.NewSuggestion("average"),
Name: "callback",
Options: []string{
"average",
"count",
"diff",
"last",
"max",
"median",
"min",
"multiply",
"range",
"stddev",
"sum",
},
Required: true,
Type: types.AggFunc,
},
},
},
"groupByNodes": {
Description: "Takes a serieslist and maps a callback to subgroups within as defined by multiple nodes\n\n.. code-block:: none\n\n &target=groupByNodes(ganglia.server*.*.cpu.load*,\"sum\",1,4)\n\nWould return multiple series which are each the result of applying the \"sum\" aggregation\nto groups joined on the nodes' list (0 indexed) resulting in a list of targets like\n\n.. code-block :: none\n\n sumSeries(ganglia.server1.*.cpu.load5),sumSeries(ganglia.server1.*.cpu.load10),sumSeries(ganglia.server1.*.cpu.load15),sumSeries(ganglia.server2.*.cpu.load5),sumSeries(ganglia.server2.*.cpu.load10),sumSeries(ganglia.server2.*.cpu.load15),...\n\nThis function can be used with all aggregation functions supported by\n:py:func:`aggregate <aggregate>`: ``average``, ``median``, ``sum``, ``min``, ``max``, ``diff``,\n``stddev``, ``range`` & ``multiply``.\n\nEach node may be an integer referencing a node in the series name or a string identifying a tag.\n\n.. code-block :: none\n\n &target=seriesByTag(\"name=~cpu.load.*\", \"server=~server[1-9}+\", \"datacenter=~dc[1-9}+\")|groupByNodes(\"average\", \"datacenter\", 1)\n\n # will produce output series like\n # dc1.load5, dc2.load5, dc1.load10, dc2.load10\n\nThis complements :py:func:`aggregateWithWildcards <aggregateWithWildcards>` which takes a list of wildcard nodes.",
Function: "groupByNodes(seriesList, callback, *nodes)",
Group: "Combine",
Module: "graphite.render.functions",
Name: "groupByNodes",
Params: []types.FunctionParam{
{
Name: "seriesList",
Required: true,
Type: types.SeriesList,
},
{
Name: "callback",
Options: []string{
"average",
"count",
"diff",
"last",
"max",
"median",
"min",
"multiply",
"range",
"stddev",
"sum",
},
Required: true,
Type: types.AggFunc,
},
{
Multiple: true,
Name: "nodes",
Required: true,
Type: types.NodeOrTag,
},
},
},
}
}