telegraf/plugins/inputs/mongodb/mongodb.go

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package mongodb
import (
"crypto/tls"
"crypto/x509"
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"fmt"
"log"
"net"
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"net/url"
"strings"
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"sync"
"time"
"github.com/influxdata/telegraf"
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tlsint "github.com/influxdata/telegraf/internal/tls"
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"github.com/influxdata/telegraf/plugins/inputs"
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"gopkg.in/mgo.v2"
)
type MongoDB struct {
Servers []string
Ssl Ssl
mongos map[string]*Server
GatherPerdbStats bool
GatherColStats bool
ColStatsDbs []string
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tlsint.ClientConfig
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}
type Ssl struct {
Enabled bool
CaCerts []string `toml:"cacerts"`
}
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var sampleConfig = `
## An array of URLs of the form:
## "mongodb://" [user ":" pass "@"] host [ ":" port]
## For example:
## mongodb://user:auth_key@10.10.3.30:27017,
## mongodb://10.10.3.33:18832,
servers = ["mongodb://127.0.0.1:27017"]
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## When true, collect per database stats
# gather_perdb_stats = false
## When true, collect per collection stats
# gather_col_stats = false
## List of db where collections stats are collected
## If empty, all db are concerned
# col_stats_dbs = ["local"]
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## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
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`
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func (m *MongoDB) SampleConfig() string {
return sampleConfig
}
func (*MongoDB) Description() string {
return "Read metrics from one or many MongoDB servers"
}
var localhost = &url.URL{Host: "mongodb://127.0.0.1:27017"}
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// Reads stats from all configured servers accumulates stats.
// Returns one of the errors encountered while gather stats (if any).
func (m *MongoDB) Gather(acc telegraf.Accumulator) error {
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if len(m.Servers) == 0 {
m.gatherServer(m.getMongoServer(localhost), acc)
return nil
}
var wg sync.WaitGroup
for i, serv := range m.Servers {
if !strings.HasPrefix(serv, "mongodb://") {
// Preserve backwards compatibility for hostnames without a
// scheme, broken in go 1.8. Remove in Telegraf 2.0
serv = "mongodb://" + serv
log.Printf("W! [inputs.mongodb] Using %q as connection URL; please update your configuration to use an URL", serv)
m.Servers[i] = serv
}
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u, err := url.Parse(serv)
if err != nil {
acc.AddError(fmt.Errorf("Unable to parse address %q: %s", serv, err))
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continue
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}
if u.Host == "" {
acc.AddError(fmt.Errorf("Unable to parse address %q", serv))
continue
}
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wg.Add(1)
go func(srv *Server) {
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defer wg.Done()
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acc.AddError(m.gatherServer(srv, acc))
}(m.getMongoServer(u))
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}
wg.Wait()
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return nil
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}
func (m *MongoDB) getMongoServer(url *url.URL) *Server {
if _, ok := m.mongos[url.Host]; !ok {
m.mongos[url.Host] = &Server{
Url: url,
}
}
return m.mongos[url.Host]
}
func (m *MongoDB) gatherServer(server *Server, acc telegraf.Accumulator) error {
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if server.Session == nil {
var dialAddrs []string
if server.Url.User != nil {
dialAddrs = []string{server.Url.String()}
} else {
dialAddrs = []string{server.Url.Host}
}
dialInfo, err := mgo.ParseURL(dialAddrs[0])
if err != nil {
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return fmt.Errorf("Unable to parse URL (%s), %s\n",
dialAddrs[0], err.Error())
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}
dialInfo.Direct = true
dialInfo.Timeout = 5 * time.Second
var tlsConfig *tls.Config
if m.Ssl.Enabled {
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// Deprecated TLS config
tlsConfig = &tls.Config{}
if len(m.Ssl.CaCerts) > 0 {
roots := x509.NewCertPool()
for _, caCert := range m.Ssl.CaCerts {
ok := roots.AppendCertsFromPEM([]byte(caCert))
if !ok {
return fmt.Errorf("failed to parse root certificate")
}
}
tlsConfig.RootCAs = roots
} else {
tlsConfig.InsecureSkipVerify = true
}
} else {
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tlsConfig, err = m.ClientConfig.TLSConfig()
if err != nil {
return err
}
}
// If configured to use TLS, add a dial function
if tlsConfig != nil {
dialInfo.DialServer = func(addr *mgo.ServerAddr) (net.Conn, error) {
conn, err := tls.Dial("tcp", addr.String(), tlsConfig)
if err != nil {
fmt.Printf("error in Dial, %s\n", err.Error())
}
return conn, err
}
}
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sess, err := mgo.DialWithInfo(dialInfo)
if err != nil {
return fmt.Errorf("Unable to connect to MongoDB, %s\n", err.Error())
}
server.Session = sess
}
return server.gatherData(acc, m.GatherPerdbStats, m.GatherColStats, m.ColStatsDbs)
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}
func init() {
inputs.Add("mongodb", func() telegraf.Input {
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return &MongoDB{
ColStatsDbs: []string{"local"},
mongos: make(map[string]*Server),
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}
})
}