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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"
"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 {
broker, err := cm.apih.FetchBrokerByID(cm.brokerID)
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
if cm.brokerSelectTag != "" {
brokerList, err = cm.apih.FetchBrokerListByTag(cm.brokerSelectTag)
if err != nil {
return nil, err
}
} else {
brokerList, err = cm.apih.FetchBrokerList()
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 {
if cm.isValidBroker(&broker) {
validBrokers[broker.Cid] = broker
if broker.Type == "enterprise" {
haveEnterprise = true
}
}
}
if haveEnterprise { // eliminate non-enterprise brokers from valid brokers
for k, v := range validBrokers {
if v.Type != "enterprise" {
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 {
for _, module := range details.Modules {
if CheckTypeType(module) == checkType {
return true
}
}
return false
}
// Is the broker valid (active, supports check type, and reachable)
func (cm *CheckManager) isValidBroker(broker *api.Broker) bool {
brokerPort := 0
valid := false
for _, detail := range broker.Details {
brokerPort = 43191
// 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
}
// broker must be reachable and respond within designated time
conn, err := net.DialTimeout("tcp", fmt.Sprintf("%s:%d", detail.IP, brokerPort), cm.brokerMaxResponseTime)
if err != nil {
if detail.CN != "trap.noit.circonus.net" {
if cm.Debug {
cm.Log.Printf("[DEBUG] Broker '%s' unable to connect, %v\n", broker.Name, err)
}
continue // not able to reach the broker (or respone slow enough for it to be considered not usable)
}
// if circonus trap broker, try port 443
brokerPort = 443
conn, err = net.DialTimeout("tcp", fmt.Sprintf("%s:%d", detail.CN, brokerPort), cm.brokerMaxResponseTime)
if err != nil {
if cm.Debug {
cm.Log.Printf("[DEBUG] Broker '%s' unable to connect %v\n", broker.Name, err)
}
continue // not able to reach the broker on 443 either (or respone slow enough for it to be considered not usable)
}
}
conn.Close()
if cm.Debug {
cm.Log.Printf("[DEBUG] Broker '%s' is valid\n", broker.Name)
}
valid = true
break
}
return valid
}
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