Couchbase input plugin

plugins/inputs/all/all.go

@@ -4,6 +4,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/aerospike"
 	_ "github.com/influxdata/telegraf/plugins/inputs/apache"
 	_ "github.com/influxdata/telegraf/plugins/inputs/bcache"
+	_ "github.com/influxdata/telegraf/plugins/inputs/couchbase"
 	_ "github.com/influxdata/telegraf/plugins/inputs/couchdb"
 	_ "github.com/influxdata/telegraf/plugins/inputs/disque"
 	_ "github.com/influxdata/telegraf/plugins/inputs/dns_query"

plugins/inputs/couchbase/README.md

@@ -0,0 +1,46 @@
+# Telegraf Plugin: Couchbase
+
+### Configuration:
+
+```
+# Read per-node and per-bucket metrics from Couchbase
+[[inputs.couchbase]]
+  ## specify servers via a url matching:
+  ##  [protocol://][:password]@address[:port]
+  ##  e.g.
+  ##    http://couchbase-0.example.com/
+  ##    http://admin:secret@couchbase-0.example.com:8091/
+  ##
+  ## If no servers are specified, then localhost is used as the host.
+  ## If no protocol is specifed, HTTP is used.
+  ## If no port is specified, 8091 is used.
+  servers = ["http://localhost:8091"]
+```
+
+## Measurements:
+
+### Per-node measurements
+
+Meta:
+- units: bytes
+- tags: `cluster`, `hostname`
+
+Measurement names:
+- memory_free
+- memory_total
+
+### Per-bucket measurements
+
+Meta:
+- units: varies
+- tags: `cluster`, `bucket`
+
+Measurement names:
+- quotaPercentUsed (unit: percent)
+- opsPerSec (unit: count)
+- diskFetches (unit: count)
+- itemCount (unit: count)
+- diskUsed (unit: bytes)
+- dataUsed (unit: bytes)
+- memUsed (unit: bytes)
+

plugins/inputs/couchbase/couchbase.go

@@ -0,0 +1,88 @@
+package couchbase
+
+import (
+	couchbase "github.com/couchbase/go-couchbase"
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	"sync"
+)
+
+type Couchbase struct {
+	Servers []string
+}
+
+var sampleConfig = `
+  ## specify servers via a url matching:
+  ##  [protocol://][:password]@address[:port]
+  ##  e.g.
+  ##    http://couchbase-0.example.com/
+  ##    http://admin:secret@couchbase-0.example.com:8091/
+  ##
+  ## If no servers are specified, then localhost is used as the host.
+  ## If no protocol is specifed, HTTP is used.
+  ## If no port is specified, 8091 is used.
+  servers = ["http://localhost:8091"]
+`
+
+func (r *Couchbase) SampleConfig() string {
+	return sampleConfig
+}
+
+func (r *Couchbase) Description() string {
+	return "Read metrics from one or many couchbase clusters"
+}
+
+// Reads stats from all configured clusters. Accumulates stats.
+// Returns one of the errors encountered while gathering stats (if any).
+func (r *Couchbase) Gather(acc telegraf.Accumulator) error {
+	if len(r.Servers) == 0 {
+		r.gatherServer("http://localhost:8091/", acc)
+		return nil
+	}
+
+	var wg sync.WaitGroup
+
+	var outerr error
+
+	for _, serv := range r.Servers {
+		wg.Add(1)
+		go func(serv string) {
+			defer wg.Done()
+			outerr = r.gatherServer(serv, acc)
+		}(serv)
+	}
+
+	wg.Wait()
+
+	return outerr
+}
+
+func (r *Couchbase) gatherServer(addr string, acc telegraf.Accumulator) error {
+	client, err := couchbase.Connect(addr)
+	if err != nil {
+		return err
+	}
+	pool, err := client.GetPool("default")
+	if err != nil {
+		return err
+	}
+	for i := 0; i < len(pool.Nodes); i++ {
+		node := pool.Nodes[i]
+		tags := map[string]string{"cluster": addr, "hostname": node.Hostname}
+		fields := make(map[string]interface{})
+		fields["memory_free"] = node.MemoryFree
+		fields["memory_total"] = node.MemoryTotal
+		acc.AddFields("couchbase_node", fields, tags)
+	}
+	for bucketName, bucket := range pool.BucketMap {
+		tags := map[string]string{"cluster": addr, "bucket": bucketName}
+		acc.AddFields("couchbase_bucket", bucket.BasicStats, tags)
+	}
+	return nil
+}
+
+func init() {
+	inputs.Add("couchbase", func() telegraf.Input {
+		return &Couchbase{}
+	})
+}