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Add cluster, role, region #5

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147 changes: 91 additions & 56 deletions discovery.go
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,9 @@ const (
rdsLabelEngineVersion = rdsLabel + "engine_version"
rdsLabelTag = rdsLabel + "tag_"
rdsLabelVPCID = rdsLabel + "vpc_id"
rdsLabelCluster = rdsLabel + "cluster"
rdsLabelInstanceRole = rdsLabel + "role"
rdsLabelRegion = rdsLabel + "region"
)

type discovery struct {
Expand All @@ -49,72 +52,104 @@ func newDiscovery(conf sdConfig, logger log.Logger) (*discovery, error) {
}

func (d *discovery) Run(ctx context.Context, ch chan<- []*targetgroup.Group) {
for c := time.Tick(time.Duration(d.refreshInterval) * time.Second); ; {
var tgs []*targetgroup.Group

sess := session.Must(session.NewSession())
client := rds.New(sess)

input := &rds.DescribeDBInstancesInput{
Filters: d.filters,
for c := time.Tick(time.Duration(d.refreshInterval) * time.Second); ; {
var tgs []*targetgroup.Group

sess := session.Must(session.NewSession())
client := rds.New(sess)

clusterWriterMap := make(map[string]bool)

// Cluster
err := client.DescribeDBClustersPagesWithContext(ctx, &rds.DescribeDBClustersInput{},
func(page *rds.DescribeDBClustersOutput, lastPage bool) bool {
for _, cluster := range page.DBClusters {
for _, member := range cluster.DBClusterMembers {
if member.IsClusterWriter != nil && *member.IsClusterWriter {
clusterWriterMap[*member.DBInstanceIdentifier] = true
}
}
}
return !lastPage
},
)
if err != nil {
level.Error(d.logger).Log("msg", "could not describe db clusters", "err", err)
continue
}

input := &rds.DescribeDBInstancesInput{
Filters: d.filters,
}
// Instance
if err := client.DescribeDBInstancesPagesWithContext(ctx, input, func(out *rds.DescribeDBInstancesOutput, lastPage bool) bool {
for _, dbi := range out.DBInstances {
labels := model.LabelSet{
rdsLabelInstanceID: model.LabelValue(*dbi.DBInstanceIdentifier),
}
labels[rdsLabelAZ] = model.LabelValue(*dbi.AvailabilityZone)
labels[rdsLabelInstanceState] = model.LabelValue(*dbi.DBInstanceStatus)
labels[rdsLabelInstanceType] = model.LabelValue(*dbi.DBInstanceClass)

addr := net.JoinHostPort(*dbi.Endpoint.Address, strconv.FormatInt(*dbi.Endpoint.Port, 10))
labels[model.AddressLabel] = model.LabelValue(addr)

labels[rdsLabelEngine] = model.LabelValue(*dbi.Engine)
labels[rdsLabelEngineVersion] = model.LabelValue(*dbi.EngineVersion)

labels[rdsLabelVPCID] = model.LabelValue(*dbi.DBSubnetGroup.VpcId)

if dbi.DBClusterIdentifier != nil {
labels[rdsLabelCluster] = model.LabelValue(*dbi.DBClusterIdentifier)
}

if err := client.DescribeDBInstancesPagesWithContext(ctx, input, func(out *rds.DescribeDBInstancesOutput, lastPage bool) bool {
for _, dbi := range out.DBInstances {
labels := model.LabelSet{
rdsLabelInstanceID: model.LabelValue(*dbi.DBInstanceIdentifier),
}

labels[rdsLabelAZ] = model.LabelValue(*dbi.AvailabilityZone)
labels[rdsLabelInstanceState] = model.LabelValue(*dbi.DBInstanceStatus)
labels[rdsLabelInstanceType] = model.LabelValue(*dbi.DBInstanceClass)

addr := net.JoinHostPort(*dbi.Endpoint.Address, strconv.FormatInt(*dbi.Endpoint.Port, 10))
labels[model.AddressLabel] = model.LabelValue(addr)

labels[rdsLabelEngine] = model.LabelValue(*dbi.Engine)
labels[rdsLabelEngineVersion] = model.LabelValue(*dbi.EngineVersion)

labels[rdsLabelVPCID] = model.LabelValue(*dbi.DBSubnetGroup.VpcId)

tags, err := listTagsForInstance(client, dbi)
if err != nil {
level.Error(d.logger).Log("msg", "could not list tags for db instance", "err", err)
}
if _, ok := clusterWriterMap[*dbi.DBInstanceIdentifier]; ok {
labels[rdsLabel + "is_cluster_writer"] = model.LabelValue("true")
} else {
labels[rdsLabel + "is_cluster_writer"] = model.LabelValue("false")
}

for _, t := range tags.TagList {
if t == nil || t.Key == nil || t.Value == nil {
continue
}
labels[rdsLabelRegion] = model.LabelValue(*dbi.AvailabilityZone)[:len(model.LabelValue(*dbi.AvailabilityZone))-1]

name := strutil.SanitizeLabelName(*t.Key)
labels[rdsLabelTag+model.LabelName(name)] = model.LabelValue(*t.Value)
}

tgs = append(tgs, &targetgroup.Group{
Source: *dbi.DBInstanceIdentifier,
Targets: []model.LabelSet{{model.AddressLabel: labels[model.AddressLabel]}},
Labels: labels,
})
}
return true
}); err != nil {
level.Error(d.logger).Log("msg", "could not describe db instance", "err", err)
time.Sleep(time.Duration(d.refreshInterval) * time.Second)
continue
tags, err := listTagsForInstance(client, dbi)
if err != nil {
level.Error(d.logger).Log("msg", "could not list tags for db instance", "err", err)
}

ch <- tgs
for _, t := range tags.TagList {
if t == nil || t.Key == nil || t.Value == nil {
continue
}

select {
case <-c:
continue
case <-ctx.Done():
return
name := strutil.SanitizeLabelName(*t.Key)
labels[rdsLabelTag+model.LabelName(name)] = model.LabelValue(*t.Value)
}
}

tgs = append(tgs, &targetgroup.Group{
Source: *dbi.DBInstanceIdentifier,
Targets: []model.LabelSet{{model.AddressLabel: labels[model.AddressLabel]}},
Labels: labels,
})
}
return true
}); err != nil {
level.Error(d.logger).Log("msg", "could not describe db instances", "err", err)
time.Sleep(time.Duration(d.refreshInterval) * time.Second)
continue
}

ch <- tgs

select {
case <-c:
continue
case <-ctx.Done():
return
}
}
}


func listTagsForInstance(client *rds.RDS, dbi *rds.DBInstance) (*rds.ListTagsForResourceOutput, error) {
input := &rds.ListTagsForResourceInput{
ResourceName: aws.String(*dbi.DBInstanceArn),
Expand Down