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service.go
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service.go
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package influxdb
import (
"fmt"
"log"
"net"
"net/url"
"strings"
"github.com/influxdata/kapacitor"
"github.com/influxdata/kapacitor/services/udp"
"github.com/influxdb/influxdb/client"
"github.com/influxdb/influxdb/cluster"
)
const (
subName = "kapacitor"
)
// Handles requests to write or read from an InfluxDB cluster
type Service struct {
configs []client.Config
i int
configSubs map[subEntry]bool
exConfigSubs map[subEntry]bool
hostname string
logger *log.Logger
udpBuffer int
udpReadBuffer int
PointsWriter interface {
WritePoints(p *cluster.WritePointsRequest) error
}
LogService interface {
NewLogger(string, int) *log.Logger
}
services []interface {
Open() error
Close() error
}
}
type subEntry struct {
db string
rp string
name string
}
type subInfo struct {
Mode string
Destinations []string
}
func NewService(c Config, hostname string, l *log.Logger) *Service {
configs := make([]client.Config, len(c.URLs))
for i, u := range c.URLs {
host, _ := url.Parse(u)
configs[i] = client.Config{
URL: *host,
Username: c.Username,
Password: c.Password,
UserAgent: "Kapacitor",
Timeout: c.Timeout,
}
}
subs := make(map[subEntry]bool, len(c.Subscriptions))
for db, rps := range c.Subscriptions {
for _, rp := range rps {
se := subEntry{db, rp, subName}
subs[se] = true
}
}
exSubs := make(map[subEntry]bool, len(c.ExcludedSubscriptions))
for db, rps := range c.ExcludedSubscriptions {
for _, rp := range rps {
se := subEntry{db, rp, subName}
exSubs[se] = true
}
}
return &Service{
configs: configs,
configSubs: subs,
exConfigSubs: exSubs,
hostname: hostname,
logger: l,
udpBuffer: c.UDPBuffer,
udpReadBuffer: c.UDPReadBuffer,
}
}
func (s *Service) Open() error {
return s.linkSubscriptions()
}
func (s *Service) Close() error {
var lastErr error
for _, service := range s.services {
err := service.Close()
if err != nil {
lastErr = err
}
}
return lastErr
}
func (s *Service) Addr() string {
config := s.configs[s.i]
s.i = (s.i + 1) % len(s.configs)
return config.URL.String()
}
func (s *Service) 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.NewClient(config)
if err != nil {
continue
}
_, _, err = c.Ping()
if err != nil {
continue
}
return
}
return
}
func (s *Service) linkSubscriptions() error {
cli, err := s.NewClient()
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 {
dbs := resp.Results[0].Series[0].Values
for _, v := range dbs {
dbname := v[0].(string)
rpResp, err := s.execQuery(cli, fmt.Sprintf(`SHOW RETENTION POLICIES ON "%s"`, dbname))
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{
db: dbname,
rp: rpname,
name: 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{
db: 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 == 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.db, 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.db, se.rp, *u)
if err != nil {
s.logger.Println("E! failed to start listener:", err)
}
// Get port from addr
parts := strings.Split(addr.String(), ":")
port := parts[len(parts)-1]
destination := "udp://" + s.hostname + ":" + port
_, err = s.execQuery(
cli,
fmt.Sprintf(`CREATE SUBSCRIPTION "%s" ON "%s"."%s" DESTINATIONS ANY '%s'`,
se.name,
se.db,
se.rp,
destination,
),
)
if err != nil {
return err
}
}
}
kapacitor.NumSubscriptions.Set(numSubscriptions)
return nil
}
func (s *Service) startListener(db, rp string, u url.URL) (net.Addr, error) {
switch u.Scheme {
case "udp":
c := udp.Config{}
c.Enabled = true
c.BindAddress = u.Host
c.Database = db
c.RetentionPolicy = rp
c.Buffer = s.udpBuffer
c.ReadBuffer = s.udpReadBuffer
l := s.LogService.NewLogger(fmt.Sprintf("[udp:%s.%s] ", db, 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", db, rp)
return service.Addr(), nil
}
return nil, fmt.Errorf("unsupported scheme %q", u.Scheme)
}
func (s *Service) 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 resp.Err != nil {
return nil, resp.Err
}
return resp, nil
}