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broker.go
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broker.go
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// Copyright 2016 Circonus, Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package checkmgr
import (
"fmt"
"math/rand"
"net"
"net/url"
"reflect"
"strconv"
"strings"
"time"
"github.com/circonus-labs/circonus-gometrics/api"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
// Get Broker to use when creating a check
func (cm *CheckManager) getBroker() (*api.Broker, error) {
if cm.brokerID != 0 {
cid := fmt.Sprintf("/broker/%d", cm.brokerID)
broker, err := cm.apih.FetchBroker(api.CIDType(&cid))
if err != nil {
return nil, err
}
if !cm.isValidBroker(broker) {
return nil, fmt.Errorf(
"[ERROR] designated broker %d [%s] is invalid (not active, does not support required check type, or connectivity issue)",
cm.brokerID,
broker.Name)
}
return broker, nil
}
broker, err := cm.selectBroker()
if err != nil {
return nil, fmt.Errorf("[ERROR] Unable to fetch suitable broker %s", err)
}
return broker, nil
}
// Get CN of Broker associated with submission_url to satisfy no IP SANS in certs
func (cm *CheckManager) getBrokerCN(broker *api.Broker, submissionURL api.URLType) (string, error) {
u, err := url.Parse(string(submissionURL))
if err != nil {
return "", err
}
hostParts := strings.Split(u.Host, ":")
host := hostParts[0]
if net.ParseIP(host) == nil { // it's a non-ip string
return u.Host, nil
}
cn := ""
for _, detail := range broker.Details {
if *detail.IP == host {
cn = detail.CN
break
}
}
if cn == "" {
return "", fmt.Errorf("[ERROR] Unable to match URL host (%s) to Broker", u.Host)
}
return cn, nil
}
// Select a broker for use when creating a check, if a specific broker
// was not specified.
func (cm *CheckManager) selectBroker() (*api.Broker, error) {
var brokerList *[]api.Broker
var err error
enterpriseType := "enterprise"
if len(cm.brokerSelectTag) > 0 {
filter := api.SearchFilterType{
"f__tags_has": cm.brokerSelectTag,
}
brokerList, err = cm.apih.SearchBrokers(nil, &filter)
if err != nil {
return nil, err
}
} else {
brokerList, err = cm.apih.FetchBrokers()
if err != nil {
return nil, err
}
}
if len(*brokerList) == 0 {
return nil, fmt.Errorf("zero brokers found")
}
validBrokers := make(map[string]api.Broker)
haveEnterprise := false
for _, broker := range *brokerList {
broker := broker
if cm.isValidBroker(&broker) {
validBrokers[broker.CID] = broker
if broker.Type == enterpriseType {
haveEnterprise = true
}
}
}
if haveEnterprise { // eliminate non-enterprise brokers from valid brokers
for k, v := range validBrokers {
if v.Type != enterpriseType {
delete(validBrokers, k)
}
}
}
if len(validBrokers) == 0 {
return nil, fmt.Errorf("found %d broker(s), zero are valid", len(*brokerList))
}
validBrokerKeys := reflect.ValueOf(validBrokers).MapKeys()
selectedBroker := validBrokers[validBrokerKeys[rand.Intn(len(validBrokerKeys))].String()]
if cm.Debug {
cm.Log.Printf("[DEBUG] Selected broker '%s'\n", selectedBroker.Name)
}
return &selectedBroker, nil
}
// Verify broker supports the check type to be used
func (cm *CheckManager) brokerSupportsCheckType(checkType CheckTypeType, details *api.BrokerDetail) bool {
baseType := string(checkType)
for _, module := range details.Modules {
if module == baseType {
return true
}
}
if idx := strings.Index(baseType, ":"); idx > 0 {
baseType = baseType[0:idx]
}
for _, module := range details.Modules {
if module == baseType {
return true
}
}
return false
}
// Is the broker valid (active, supports check type, and reachable)
func (cm *CheckManager) isValidBroker(broker *api.Broker) bool {
var brokerHost string
var brokerPort string
if broker.Type != "circonus" && broker.Type != "enterprise" {
return false
}
valid := false
for _, detail := range broker.Details {
detail := detail
// broker must be active
if detail.Status != statusActive {
if cm.Debug {
cm.Log.Printf("[DEBUG] Broker '%s' is not active.\n", broker.Name)
}
continue
}
// broker must have module loaded for the check type to be used
if !cm.brokerSupportsCheckType(cm.checkType, &detail) {
if cm.Debug {
cm.Log.Printf("[DEBUG] Broker '%s' does not support '%s' checks.\n", broker.Name, cm.checkType)
}
continue
}
if detail.ExternalPort != 0 {
brokerPort = strconv.Itoa(int(detail.ExternalPort))
} else {
if detail.Port != nil && *detail.Port != 0 {
brokerPort = strconv.Itoa(int(*detail.Port))
} else {
brokerPort = "43191"
}
}
if detail.ExternalHost != nil && *detail.ExternalHost != "" {
brokerHost = *detail.ExternalHost
} else if detail.IP != nil && *detail.IP != "" {
brokerHost = *detail.IP
}
if brokerHost == "" {
cm.Log.Printf("[WARN] Broker '%s' instance %s has no IP or external host set", broker.Name, detail.CN)
continue
}
if brokerHost == "trap.noit.circonus.net" && brokerPort != "443" {
brokerPort = "443"
}
retries := 5
for attempt := 1; attempt <= retries; attempt++ {
// broker must be reachable and respond within designated time
conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%s", brokerHost, brokerPort), cm.brokerMaxResponseTime)
if err == nil {
conn.Close()
valid = true
break
}
cm.Log.Printf("[WARN] Broker '%s' unable to connect, %v. Retrying in 2 seconds, attempt %d of %d.", broker.Name, err, attempt, retries)
time.Sleep(2 * time.Second)
}
if valid {
if cm.Debug {
cm.Log.Printf("[DEBUG] Broker '%s' is valid\n", broker.Name)
}
break
}
}
return valid
}