/
utilization.go
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/
utilization.go
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// Copyright 2020 New Relic Corporation. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
// Package utilization implements the Utilization spec, available at
// https://source.datanerd.us/agents/agent-specs/blob/master/Utilization.md
//
package utilization
import (
"net/http"
"os"
"runtime"
"sync"
"github.com/newrelic/go-agent/internal/logger"
"github.com/newrelic/go-agent/internal/sysinfo"
)
const (
metadataVersion = 5
)
// Config controls the behavior of utilization information capture.
type Config struct {
DetectAWS bool
DetectAzure bool
DetectGCP bool
DetectPCF bool
DetectDocker bool
DetectKubernetes bool
LogicalProcessors int
TotalRAMMIB int
BillingHostname string
}
type override struct {
LogicalProcessors *int `json:"logical_processors,omitempty"`
TotalRAMMIB *int `json:"total_ram_mib,omitempty"`
BillingHostname string `json:"hostname,omitempty"`
}
// Data contains utilization system information.
type Data struct {
MetadataVersion int `json:"metadata_version"`
// Although `runtime.NumCPU()` will never fail, this field is a pointer
// to facilitate the cross agent tests.
LogicalProcessors *int `json:"logical_processors"`
RAMMiB *uint64 `json:"total_ram_mib"`
Hostname string `json:"hostname"`
FullHostname string `json:"full_hostname,omitempty"`
Addresses []string `json:"ip_address,omitempty"`
BootID string `json:"boot_id,omitempty"`
Config *override `json:"config,omitempty"`
Vendors *vendors `json:"vendors,omitempty"`
}
var (
sampleRAMMib = uint64(1024)
sampleLogicProc = int(16)
// SampleData contains sample utilization data useful for testing.
SampleData = Data{
MetadataVersion: metadataVersion,
LogicalProcessors: &sampleLogicProc,
RAMMiB: &sampleRAMMib,
Hostname: "my-hostname",
}
)
type docker struct {
ID string `json:"id,omitempty"`
}
type kubernetes struct {
Host string `json:"kubernetes_service_host"`
}
type vendors struct {
AWS *aws `json:"aws,omitempty"`
Azure *azure `json:"azure,omitempty"`
GCP *gcp `json:"gcp,omitempty"`
PCF *pcf `json:"pcf,omitempty"`
Docker *docker `json:"docker,omitempty"`
Kubernetes *kubernetes `json:"kubernetes,omitempty"`
}
func (v *vendors) isEmpty() bool {
return nil == v || *v == vendors{}
}
func overrideFromConfig(config Config) *override {
ov := &override{}
if 0 != config.LogicalProcessors {
x := config.LogicalProcessors
ov.LogicalProcessors = &x
}
if 0 != config.TotalRAMMIB {
x := config.TotalRAMMIB
ov.TotalRAMMIB = &x
}
ov.BillingHostname = config.BillingHostname
if "" == ov.BillingHostname &&
nil == ov.LogicalProcessors &&
nil == ov.TotalRAMMIB {
ov = nil
}
return ov
}
// Gather gathers system utilization data.
func Gather(config Config, lg logger.Logger) *Data {
client := &http.Client{
Timeout: providerTimeout,
}
return gatherWithClient(config, lg, client)
}
func gatherWithClient(config Config, lg logger.Logger, client *http.Client) *Data {
var wg sync.WaitGroup
cpu := runtime.NumCPU()
uDat := &Data{
MetadataVersion: metadataVersion,
LogicalProcessors: &cpu,
Vendors: &vendors{},
}
warnGatherError := func(datatype string, err error) {
lg.Debug("error gathering utilization data", map[string]interface{}{
"error": err.Error(),
"datatype": datatype,
})
}
// Gather IPs before spawning goroutines since the IPs are used in
// gathering full hostname.
if ips, err := utilizationIPs(); nil == err {
uDat.Addresses = ips
} else {
warnGatherError("addresses", err)
}
// This closure allows us to run each gather function in a separate goroutine
// and wait for them at the end by closing over the wg WaitGroup we
// instantiated at the start of the function.
goGather := func(datatype string, gather func(*Data, *http.Client) error) {
wg.Add(1)
go func() {
// Note that locking around util is not necessary since
// WaitGroup provides acts as a memory barrier:
// https://groups.google.com/d/msg/golang-nuts/5oHzhzXCcmM/utEwIAApCQAJ
// Thus this code is fine as long as each routine is
// modifying a different field of util.
defer wg.Done()
if err := gather(uDat, client); err != nil {
warnGatherError(datatype, err)
}
}()
}
// Kick off gathering which requires network calls in goroutines.
if config.DetectAWS {
goGather("aws", gatherAWS)
}
if config.DetectAzure {
goGather("azure", gatherAzure)
}
if config.DetectPCF {
goGather("pcf", gatherPCF)
}
if config.DetectGCP {
goGather("gcp", gatherGCP)
}
wg.Add(1)
go func() {
defer wg.Done()
uDat.FullHostname = getFQDN(uDat.Addresses)
}()
// Do non-network gathering sequentially since it is fast.
if id, err := sysinfo.BootID(); err != nil {
if err != sysinfo.ErrFeatureUnsupported {
warnGatherError("bootid", err)
}
} else {
uDat.BootID = id
}
if config.DetectKubernetes {
gatherKubernetes(uDat.Vendors, os.Getenv)
}
if config.DetectDocker {
if id, err := sysinfo.DockerID(); err != nil {
if err != sysinfo.ErrFeatureUnsupported &&
err != sysinfo.ErrDockerNotFound {
warnGatherError("docker", err)
}
} else {
uDat.Vendors.Docker = &docker{ID: id}
}
}
if hostname, err := sysinfo.Hostname(); nil == err {
uDat.Hostname = hostname
} else {
warnGatherError("hostname", err)
}
if bts, err := sysinfo.PhysicalMemoryBytes(); nil == err {
mib := sysinfo.BytesToMebibytes(bts)
uDat.RAMMiB = &mib
} else {
warnGatherError("memory", err)
}
// Now we wait for everything!
wg.Wait()
// Override whatever needs to be overridden.
uDat.Config = overrideFromConfig(config)
if uDat.Vendors.isEmpty() {
// Per spec, we MUST NOT send any vendors hash if it's empty.
uDat.Vendors = nil
}
return uDat
}
func gatherKubernetes(v *vendors, getenv func(string) string) {
if host := getenv("KUBERNETES_SERVICE_HOST"); host != "" {
v.Kubernetes = &kubernetes{Host: host}
}
}