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service.go
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service.go
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package influxdb
import (
"bytes"
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"io/ioutil"
"log"
"net"
"net/url"
"strings"
"time"
"github.com/cenkalti/backoff"
client "github.com/influxdata/influxdb/client/v2"
"github.com/influxdata/influxdb/models"
"github.com/influxdata/kapacitor"
"github.com/influxdata/kapacitor/services/udp"
)
const (
// Legacy name given to all subscriptions.
legacySubName = "kapacitor"
subNamePrefix = "kapacitor-"
)
// Handles requests to write or read from an InfluxDB cluster
type Service struct {
defaultInfluxDB string
clusters map[string]*influxdb
PointsWriter interface {
WritePoints(database, retentionPolicy string, consistencyLevel models.ConsistencyLevel, points []models.Point) error
}
LogService interface {
NewLogger(string, int) *log.Logger
}
logger *log.Logger
}
func NewService(configs []Config, defaultInfluxDB int, hostname string, l *log.Logger) *Service {
clusterID := kapacitor.ClusterIDVar.StringValue()
subName := subNamePrefix + clusterID
clusters := make(map[string]*influxdb, len(configs))
var defaultInfluxDBName string
for i, c := range configs {
urls := make([]client.HTTPConfig, len(c.URLs))
tlsConfig, err := getTLSConfig(c.SSLCA, c.SSLCert, c.SSLKey, c.InsecureSkipVerify)
if err != nil {
// Config should have been validated already
panic(err)
}
if c.InsecureSkipVerify {
l.Printf("W! Using InsecureSkipVerify when connecting to InfluxDB @ %v this is insecure!", c.URLs)
}
for i, u := range c.URLs {
urls[i] = client.HTTPConfig{
Addr: u,
Username: c.Username,
Password: c.Password,
UserAgent: "Kapacitor",
Timeout: time.Duration(c.Timeout),
TLSConfig: tlsConfig,
}
}
subs := make(map[subEntry]bool, len(c.Subscriptions))
for cluster, rps := range c.Subscriptions {
for _, rp := range rps {
se := subEntry{cluster, rp, subName}
subs[se] = true
}
}
exSubs := make(map[subEntry]bool, len(c.ExcludedSubscriptions))
for cluster, rps := range c.ExcludedSubscriptions {
for _, rp := range rps {
se := subEntry{cluster, rp, subName}
exSubs[se] = true
}
}
clusters[c.Name] = &influxdb{
configs: urls,
configSubs: subs,
exConfigSubs: exSubs,
hostname: hostname,
logger: l,
udpBuffer: c.UDPBuffer,
udpReadBuffer: c.UDPReadBuffer,
startupTimeout: time.Duration(c.StartUpTimeout),
clusterID: clusterID,
subName: subName,
}
if defaultInfluxDB == i {
defaultInfluxDBName = c.Name
}
}
return &Service{
defaultInfluxDB: defaultInfluxDBName,
clusters: clusters,
logger: l,
}
}
func (s *Service) Open() error {
for _, cluster := range s.clusters {
cluster.PointsWriter = s.PointsWriter
cluster.LogService = s.LogService
err := cluster.Open()
if err != nil {
return err
}
}
return nil
}
func (s *Service) Close() error {
var lastErr error
for _, cluster := range s.clusters {
err := cluster.Close()
if err != nil {
lastErr = err
}
}
return lastErr
}
func (s *Service) NewDefaultClient() (client.Client, error) {
return s.clusters[s.defaultInfluxDB].NewClient()
}
func (s *Service) NewNamedClient(name string) (client.Client, error) {
cluster, ok := s.clusters[name]
if !ok {
return nil, fmt.Errorf("no such InfluxDB config %s", name)
}
return cluster.NewClient()
}
type influxdb struct {
configs []client.HTTPConfig
i int
configSubs map[subEntry]bool
exConfigSubs map[subEntry]bool
hostname string
logger *log.Logger
udpBuffer int
udpReadBuffer int
startupTimeout time.Duration
clusterID string
subName string
PointsWriter interface {
WritePoints(database, retentionPolicy string, consistencyLevel models.ConsistencyLevel, points []models.Point) error
}
LogService interface {
NewLogger(string, int) *log.Logger
}
services []interface {
Open() error
Close() error
}
}
type subEntry struct {
cluster string
rp string
name string
}
type subInfo struct {
Mode string
Destinations []string
}
func (s *influxdb) Open() error {
return s.linkSubscriptions()
}
func (s *influxdb) Close() error {
var lastErr error
for _, service := range s.services {
err := service.Close()
if err != nil {
lastErr = err
}
}
return lastErr
}
func (s *influxdb) Addr() string {
config := s.configs[s.i]
s.i = (s.i + 1) % len(s.configs)
return config.Addr
}
func (s *influxdb) NewClient() (c client.Client, err error) {
tries := 0
for tries < len(s.configs) {
tries++
config := s.configs[s.i]
s.i = (s.i + 1) % len(s.configs)
c, err = client.NewHTTPClient(config)
if err != nil {
continue
}
_, _, err = c.Ping(config.Timeout)
if err != nil {
continue
}
return
}
return
}
func (s *influxdb) linkSubscriptions() error {
s.logger.Println("I! linking subscriptions")
b := backoff.NewExponentialBackOff()
b.MaxElapsedTime = s.startupTimeout
ticker := backoff.NewTicker(b)
var err error
var cli client.Client
for range ticker.C {
cli, err = s.NewClient()
if err != nil {
s.logger.Println("D! failed to connect to InfluxDB, retrying... ", err)
continue
}
ticker.Stop()
break
}
if err != nil {
return err
}
numSubscriptions := int64(0)
// Get all databases and retention policies
var allSubs []subEntry
resp, err := s.execQuery(cli, "SHOW DATABASES")
if err != nil {
return err
}
if len(resp.Results) == 1 && len(resp.Results[0].Series) == 1 && len(resp.Results[0].Series[0].Values) > 0 {
clusters := resp.Results[0].Series[0].Values
for _, v := range clusters {
clustername := v[0].(string)
rpResp, err := s.execQuery(cli, fmt.Sprintf(`SHOW RETENTION POLICIES ON "%s"`, clustername))
if err != nil {
return err
}
if len(rpResp.Results) == 1 && len(rpResp.Results[0].Series) == 1 && len(rpResp.Results[0].Series[0].Values) > 0 {
rps := rpResp.Results[0].Series[0].Values
for _, v := range rps {
rpname := v[0].(string)
se := subEntry{
cluster: clustername,
rp: rpname,
name: s.subName,
}
allSubs = append(allSubs, se)
}
}
}
}
// Get all existing subscriptions
resp, err = s.execQuery(cli, "SHOW SUBSCRIPTIONS")
if err != nil {
return err
}
existingSubs := make(map[subEntry]subInfo)
for _, res := range resp.Results {
for _, series := range res.Series {
for _, v := range series.Values {
se := subEntry{
cluster: series.Name,
}
si := subInfo{}
for i, c := range series.Columns {
switch c {
case "retention_policy":
se.rp = v[i].(string)
case "name":
se.name = v[i].(string)
case "mode":
si.Mode = v[i].(string)
case "destinations":
destinations := v[i].([]interface{})
si.Destinations = make([]string, len(destinations))
for i := range destinations {
si.Destinations[i] = destinations[i].(string)
}
}
}
if se.name == legacySubName {
// This is an old-style subscription,
// drop it and recreate with new name.
err := s.dropSub(cli, se.name, se.cluster, se.rp)
if err != nil {
return err
}
se.name = s.subName
err = s.createSub(cli, se.name, se.cluster, se.rp, si.Mode, si.Destinations)
if err != nil {
return err
}
existingSubs[se] = si
} else if se.name == s.clusterID {
// This is an just the cluster ID
// drop it and recreate with new name.
err := s.dropSub(cli, se.name, se.cluster, se.rp)
se.name = s.subName
err = s.createSub(cli, se.name, se.cluster, se.rp, si.Mode, si.Destinations)
if err != nil {
return err
}
existingSubs[se] = si
} else if se.name == s.subName {
existingSubs[se] = si
}
}
}
}
// Compare to configured list
startedSubs := make(map[subEntry]bool)
all := len(s.configSubs) == 0
for se, si := range existingSubs {
if (s.configSubs[se] || all) && !s.exConfigSubs[se] {
// Check if this kapacitor instance is in the list of hosts
for _, dest := range si.Destinations {
u, err := url.Parse(dest)
if err != nil {
s.logger.Println("E! invalid URL in subscription destinations:", err)
continue
}
pair := strings.Split(u.Host, ":")
if pair[0] == s.hostname {
numSubscriptions++
_, err := s.startListener(se.cluster, se.rp, *u)
if err != nil {
s.logger.Println("E! failed to start listener:", err)
}
startedSubs[se] = true
break
}
}
}
}
// create and start any new subscriptions
for _, se := range allSubs {
// If we have been configured to subscribe and the subscription is not started yet.
if (s.configSubs[se] || all) && !startedSubs[se] && !s.exConfigSubs[se] {
u, err := url.Parse("udp://:0")
if err != nil {
return fmt.Errorf("could not create valid destination url, is hostname correct? err: %s", err)
}
numSubscriptions++
addr, err := s.startListener(se.cluster, se.rp, *u)
if err != nil {
s.logger.Println("E! failed to start listener:", err)
}
// Get port from addr
destination := fmt.Sprintf("udp://%s:%d", s.hostname, addr.Port)
err = s.createSub(cli, se.name, se.cluster, se.rp, "ANY", []string{destination})
if err != nil {
return err
}
}
}
kapacitor.NumSubscriptionsVar.Set(numSubscriptions)
return nil
}
func (s *influxdb) createSub(cli client.Client, name, cluster, rp, mode string, destinations []string) (err error) {
var buf bytes.Buffer
for i, dst := range destinations {
if i != 0 {
buf.Write([]byte(", "))
}
buf.Write([]byte("'"))
buf.Write([]byte(dst))
buf.Write([]byte("'"))
}
q := fmt.Sprintf(`CREATE SUBSCRIPTION "%s" ON "%s"."%s" DESTINATIONS %s %s`,
name,
cluster,
rp,
strings.ToUpper(mode),
buf.String(),
)
_, err = s.execQuery(
cli,
q,
)
return
}
func (s *influxdb) dropSub(cli client.Client, name, cluster, rp string) (err error) {
_, err = s.execQuery(
cli,
fmt.Sprintf(`DROP SUBSCRIPTION "%s" ON "%s"."%s"`,
name,
cluster,
rp,
),
)
return
}
func (s *influxdb) startListener(cluster, rp string, u url.URL) (*net.UDPAddr, error) {
switch u.Scheme {
case "udp":
c := udp.Config{}
c.Enabled = true
c.BindAddress = u.Host
c.Database = cluster
c.RetentionPolicy = rp
c.Buffer = s.udpBuffer
c.ReadBuffer = s.udpReadBuffer
l := s.LogService.NewLogger(fmt.Sprintf("[udp:%s.%s] ", cluster, rp), log.LstdFlags)
service := udp.NewService(c, l)
service.PointsWriter = s.PointsWriter
err := service.Open()
if err != nil {
return nil, err
}
s.services = append(s.services, service)
s.logger.Println("I! started UDP listener for", cluster, rp)
return service.Addr(), nil
}
return nil, fmt.Errorf("unsupported scheme %q", u.Scheme)
}
func (s *influxdb) execQuery(cli client.Client, q string) (*client.Response, error) {
query := client.Query{
Command: q,
}
resp, err := cli.Query(query)
if err != nil {
return nil, err
}
if err := resp.Error(); err != nil {
return nil, err
}
return resp, nil
}
// getTLSConfig creates a tls.Config object from the given certs, key, and CA files.
// you must give the full path to the files.
func getTLSConfig(
SSLCA, SSLCert, SSLKey string,
InsecureSkipVerify bool,
) (*tls.Config, error) {
t := &tls.Config{
InsecureSkipVerify: InsecureSkipVerify,
}
if SSLCert != "" && SSLKey != "" {
cert, err := tls.LoadX509KeyPair(SSLCert, SSLKey)
log.Println(SSLCert, SSLKey)
if err != nil {
return nil, fmt.Errorf(
"Could not load TLS client key/certificate: %s",
err)
}
t.Certificates = []tls.Certificate{cert}
} else if SSLCert != "" {
return nil, errors.New("Must provide both key and cert files: only cert file provided.")
} else if SSLKey != "" {
return nil, errors.New("Must provide both key and cert files: only key file provided.")
}
if SSLCA != "" {
caCert, err := ioutil.ReadFile(SSLCA)
if err != nil {
return nil, fmt.Errorf("Could not load TLS CA: %s",
err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
t.RootCAs = caCertPool
}
return t, nil
}