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clientvpn.go
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clientvpn.go
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package ec2
import (
"context"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ec2"
"github.com/aws/aws-sdk-go/service/ec2/ec2iface"
"github.com/tetratom/cloudsurvey/internal/util"
"github.com/tetratom/cloudsurvey/pkg/metric"
"github.com/tetratom/cloudsurvey/pkg/registry"
"golang.org/x/sync/errgroup"
"log"
"strconv"
"time"
)
const (
ClientVpnPluginName = "aws_ec2_clientvpn"
ClientVpnPluginConnectionMetricName = "aws_ec2_clientvpn_connection"
clientVpnTimeFormat = "2006-01-02 15:04:05"
)
func init() {
registry.AddSource(
ClientVpnPluginName,
func(sess registry.Session) registry.Source {
return &ClientVPN{
api: ec2.New(sess.(*session.Session)),
}
})
}
type ClientVPN struct {
api ec2iface.EC2API
}
func (plugin *ClientVPN) Description() string {
return ""
}
func (plugin *ClientVPN) DefaultConfig() string {
return `[[sources.aws_ec2_clientvpn]]
scopes = ["aws_regional"]`
}
func (plugin *ClientVPN) Source(c context.Context, collector metric.Collector) error {
eg, c := errgroup.WithContext(c)
ch := make(chan *ec2.ClientVpnEndpoint, 2)
eg.Go(func() error {
defer close(ch)
return plugin.getEndpointIds(c, ch)
})
for i := 0; i < 2; i++ {
eg.Go(func() error {
for endpoint := range ch {
if err := plugin.sendEndpointStats(c, collector, endpoint); err != nil {
return err
}
}
return nil
})
}
return eg.Wait()
}
func (plugin *ClientVPN) getEndpointIds(c context.Context, ch chan<- *ec2.ClientVpnEndpoint) error {
input := ec2.DescribeClientVpnEndpointsInput{}
return plugin.api.DescribeClientVpnEndpointsPagesWithContext(
c, &input, func(page *ec2.DescribeClientVpnEndpointsOutput, last bool) bool {
for _, endpoint := range page.ClientVpnEndpoints {
select {
case <-c.Done():
return false
case ch <- endpoint:
}
}
return true
})
}
func (plugin *ClientVPN) sendEndpointStats(
c context.Context,
collector metric.Collector,
endpoint *ec2.ClientVpnEndpoint,
) error {
input := ec2.DescribeClientVpnConnectionsInput{
ClientVpnEndpointId: endpoint.ClientVpnEndpointId,
}
return plugin.api.DescribeClientVpnConnectionsPagesWithContext(
c, &input, func(page *ec2.DescribeClientVpnConnectionsOutput, last bool) bool {
for _, connection := range page.Connections {
datum, err := plugin.connectionStats(c, endpoint, connection)
if err != nil {
// TODO: Capturing this error?
log.Printf("error: %+v", err)
return false
}
collector.Record(datum)
}
return true
})
}
func (plugin *ClientVPN) connectionStats(
c context.Context,
endpoint *ec2.ClientVpnEndpoint,
connection *ec2.ClientVpnConnection,
) (metric.Datum, error) {
now := util.ContextNowTime(c)
d := metric.Datum{
Time: now,
Name: ClientVpnPluginConnectionMetricName,
Tags: map[string]string{},
Fields: map[string]interface{}{},
}
d.Tags["endpoint_id"] = *connection.ClientVpnEndpointId
if connection.CommonName != nil {
d.Tags["common_name"] = *connection.CommonName
}
d.Tags["status"] = *connection.Status.Code
if connection.Username != nil {
d.Tags["username"] = *connection.Username
}
if t, err := time.Parse(clientVpnTimeFormat, *connection.ConnectionEstablishedTime); err == nil {
d.Fields["age"] = now.Sub(t)
}
i64Fields := []struct {
value *string
name string
}{
{connection.EgressBytes, "egress_bytes"},
{connection.EgressPackets, "egress_packets"},
{connection.IngressBytes, "ingress_bytes"},
{connection.IngressPackets, "ingress_packets"},
}
for _, field := range i64Fields {
if field.value == nil {
continue
}
if b, err := strconv.ParseInt(*field.value, 10, 64); err == nil {
d.Fields[field.name] = b
}
}
return d, nil
}