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mongodb.go
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mongodb.go
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package mongodb
import (
"fmt"
"net/url"
"strings"
"github.com/elastic/beats/libbeat/logp"
"github.com/elastic/beats/metricbeat/mb"
"github.com/elastic/beats/metricbeat/mb/parse"
mgo "gopkg.in/mgo.v2"
)
func init() {
// Register the ModuleFactory function for the "mongodb" module.
if err := mb.Registry.AddModule("mongodb", NewModule); err != nil {
panic(err)
}
}
// NewModule creates a new mb.Module instance and validates that at least one host has been
// specified
func NewModule(base mb.BaseModule) (mb.Module, error) {
// Validate that at least one host has been specified.
config := struct {
Hosts []string `config:"hosts" validate:"nonzero,required"`
}{}
if err := base.UnpackConfig(&config); err != nil {
return nil, err
}
return &base, nil
}
// ParseURL parses valid MongoDB URL strings into an mb.HostData instance
func ParseURL(module mb.Module, host string) (mb.HostData, error) {
c := struct {
Username string `config:"username"`
Password string `config:"password"`
}{}
if err := module.UnpackConfig(&c); err != nil {
return mb.HostData{}, err
}
if parts := strings.SplitN(host, "://", 2); len(parts) != 2 {
// Add scheme.
host = fmt.Sprintf("mongodb://%s", host)
}
// This doesn't use URLHostParserBuilder because MongoDB URLs can contain
// multiple hosts separated by commas (mongodb://host1,host2,host3?options).
u, err := url.Parse(host)
if err != nil {
return mb.HostData{}, fmt.Errorf("error parsing URL: %v", err)
}
parse.SetURLUser(u, c.Username, c.Password)
// https://docs.mongodb.com/manual/reference/connection-string/
_, err = mgo.ParseURL(u.String())
if err != nil {
return mb.HostData{}, err
}
return parse.NewHostDataFromURL(u), nil
}
// NewDirectSession estbalishes direct connections with a list of hosts. It uses the supplied
// dialInfo parameter as a template for establishing more direct connections
func NewDirectSession(dialInfo *mgo.DialInfo) (*mgo.Session, error) {
// make a copy
nodeDialInfo := *dialInfo
nodeDialInfo.Direct = true
nodeDialInfo.FailFast = true
logp.Debug("mongodb", "Connecting to MongoDB node at %v", nodeDialInfo.Addrs)
session, err := mgo.DialWithInfo(&nodeDialInfo)
if err != nil {
logp.Err("Error establishing direct connection to mongo node at %v. Error output: %s", nodeDialInfo.Addrs, err.Error())
return nil, err
}
return session, nil
}