Add input plugin for McRouter

McRouter is a smart proxy for Memcached

https://github.com/facebook/mcrouter

plugins/inputs/all/all.go

@@ -50,6 +50,7 @@ import (
 	_ "github.com/influxdata/telegraf/plugins/inputs/logparser"
 	_ "github.com/influxdata/telegraf/plugins/inputs/lustre2"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mailchimp"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mcrouter"
 	_ "github.com/influxdata/telegraf/plugins/inputs/memcached"
 	_ "github.com/influxdata/telegraf/plugins/inputs/mesos"
 	_ "github.com/influxdata/telegraf/plugins/inputs/minecraft"

plugins/inputs/mcrouter/README.md

@@ -0,0 +1,103 @@
+# Mcrouter Input Plugin
+
+This plugin gathers statistics data from a Mcrouter server.
+
+### Configuration:
+
+```toml
+# Read metrics from one or many mcrouter servers.
+[[inputs.mcrouter]]
+  ## An array of address to gather stats about. Specify an ip or hostname
+  ## with port. ie tcp://localhost:11211, tcp://10.0.0.1:11211, etc.
+  servers = ["tcp://localhost:11211", "unix:///var/run/mcrouter.sock"]
+
+  ## Timeout for metric collections from all servers.  Minimum timeout is "1s".
+  # timeout = "5s"
+```
+
+### Measurements & Fields:
+
+The fields from this plugin are gathered in the *mcrouter* measurement.
+
+Description of gathered fields can be found [here](https://github.com/facebook/mcrouter/wiki/Stats-list).
+
+Fields:
+
+* uptime
+* num_servers
+* num_servers_new
+* num_servers_up
+* num_servers_down
+* num_servers_closed
+* num_clients
+* num_suspect_servers
+* destination_batches_sum
+* destination_requests_sum
+* outstanding_route_get_reqs_queued
+* outstanding_route_update_reqs_queued
+* outstanding_route_get_avg_queue_size
+* outstanding_route_update_avg_queue_size
+* outstanding_route_get_avg_wait_time_sec
+* outstanding_route_update_avg_wait_time_sec
+* retrans_closed_connections
+* destination_pending_reqs
+* destination_inflight_reqs
+* destination_batch_size
+* asynclog_requests
+* proxy_reqs_processing
+* proxy_reqs_waiting
+* client_queue_notify_period
+* rusage_system
+* rusage_user
+* ps_num_minor_faults
+* ps_num_major_faults
+* ps_user_time_sec
+* ps_system_time_sec
+* ps_vsize
+* ps_rss
+* fibers_allocated
+* fibers_pool_size
+* fibers_stack_high_watermark
+* successful_client_connections
+* duration_us
+* destination_max_pending_reqs
+* destination_max_inflight_reqs
+* retrans_per_kbyte_max
+* cmd_get_count
+* cmd_delete_out
+* cmd_lease_get
+* cmd_set
+* cmd_get_out_all
+* cmd_get_out
+* cmd_lease_set_count
+* cmd_other_out_all
+* cmd_lease_get_out
+* cmd_set_count
+* cmd_lease_set_out
+* cmd_delete_count
+* cmd_other
+* cmd_delete
+* cmd_get
+* cmd_lease_set
+* cmd_set_out
+* cmd_lease_get_count
+* cmd_other_out
+* cmd_lease_get_out_all
+* cmd_set_out_all
+* cmd_other_count
+* cmd_delete_out_all
+* cmd_lease_set_out_all
+
+### Tags:
+
+* Mcrouter measurements have the following tags:
+    - server (the host name from which metrics are gathered)
+
+
+
+### Example Output:
+
+```
+$ ./telegraf --config telegraf.conf --input-filter mcrouter --test
+mcrouter,server=localhost:11211 uptime=166,num_servers=1,num_servers_new=1,num_servers_up=0,num_servers_down=0,num_servers_closed=0,num_clients=1,num_suspect_servers=0,destination_batches_sum=0,destination_requests_sum=0,outstanding_route_get_reqs_queued=0,outstanding_route_update_reqs_queued=0,outstanding_route_get_avg_queue_size=0,outstanding_route_update_avg_queue_size=0,outstanding_route_get_avg_wait_time_sec=0,outstanding_route_update_avg_wait_time_sec=0,retrans_closed_connections=0,destination_pending_reqs=0,destination_inflight_reqs=0,destination_batch_size=0,asynclog_requests=0,proxy_reqs_processing=1,proxy_reqs_waiting=0,client_queue_notify_period=0,rusage_system=0.040966,rusage_user=0.020483,ps_num_minor_faults=2490,ps_num_major_faults=11,ps_user_time_sec=0.02,ps_system_time_sec=0.04,ps_vsize=697741312,ps_rss=10563584,fibers_allocated=0,fibers_pool_size=0,fibers_stack_high_watermark=0,successful_client_connections=18,duration_us=0,destination_max_pending_reqs=0,destination_max_inflight_reqs=0,retrans_per_kbyte_max=0,cmd_get_count=0,cmd_delete_out=0,cmd_lease_get=0,cmd_set=0,cmd_get_out_all=0,cmd_get_out=0,cmd_lease_set_count=0,cmd_other_out_all=0,cmd_lease_get_out=0,cmd_set_count=0,cmd_lease_set_out=0,cmd_delete_count=0,cmd_other=0,cmd_delete=0,cmd_get=0,cmd_lease_set=0,cmd_set_out=0,cmd_lease_get_count=0,cmd_other_out=0,cmd_lease_get_out_all=0,cmd_set_out_all=0,cmd_other_count=0,cmd_delete_out_all=0,cmd_lease_set_out_all=0 1453831884664956455
+```

plugins/inputs/mcrouter/mcrouter.go

@@ -0,0 +1,273 @@
+package mcrouter
+
+import (
+	"bufio"
+	"context"
+	"fmt"
+	"net"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+// Mcrouter is a mcrouter plugin
+type Mcrouter struct {
+	Servers []string
+	Timeout internal.Duration
+}
+
+// enum for statType
+type statType int
+
+const (
+	typeInt   statType = iota
+	typeFloat statType = iota
+)
+
+var sampleConfig = `
+  ## An array of address to gather stats about. Specify an ip or hostname
+  ## with port. ie tcp://localhost:11211, tcp://10.0.0.1:11211, etc.
+	servers = ["tcp://localhost:11211", "unix:///var/run/mcrouter.sock"]
+
+	## Timeout for metric collections from all servers.  Minimum timeout is "1s".
+  # timeout = "5s"
+`
+
+var defaultTimeout = 5 * time.Second
+
+var defaultServerURL = url.URL{
+	Scheme: "tcp",
+	Host:   "localhost:11211",
+}
+
+// The list of metrics that should be sent
+var sendMetrics = map[string]statType{
+	"uptime":                                     typeInt,
+	"num_servers":                                typeInt,
+	"num_servers_new":                            typeInt,
+	"num_servers_up":                             typeInt,
+	"num_servers_down":                           typeInt,
+	"num_servers_closed":                         typeInt,
+	"num_clients":                                typeInt,
+	"num_suspect_servers":                        typeInt,
+	"destination_batches_sum":                    typeInt,
+	"destination_requests_sum":                   typeInt,
+	"outstanding_route_get_reqs_queued":          typeInt,
+	"outstanding_route_update_reqs_queued":       typeInt,
+	"outstanding_route_get_avg_queue_size":       typeInt,
+	"outstanding_route_update_avg_queue_size":    typeInt,
+	"outstanding_route_get_avg_wait_time_sec":    typeInt,
+	"outstanding_route_update_avg_wait_time_sec": typeInt,
+	"retrans_closed_connections":                 typeInt,
+	"destination_pending_reqs":                   typeInt,
+	"destination_inflight_reqs":                  typeInt,
+	"destination_batch_size":                     typeInt,
+	"asynclog_requests":                          typeInt,
+	"proxy_reqs_processing":                      typeInt,
+	"proxy_reqs_waiting":                         typeInt,
+	"client_queue_notify_period":                 typeInt,
+	"rusage_system":                              typeFloat,
+	"rusage_user":                                typeFloat,
+	"ps_num_minor_faults":                        typeInt,
+	"ps_num_major_faults":                        typeInt,
+	"ps_user_time_sec":                           typeFloat,
+	"ps_system_time_sec":                         typeFloat,
+	"ps_vsize":                                   typeInt,
+	"ps_rss":                                     typeInt,
+	"fibers_allocated":                           typeInt,
+	"fibers_pool_size":                           typeInt,
+	"fibers_stack_high_watermark":                typeInt,
+	"successful_client_connections":              typeInt,
+	"duration_us":                                typeInt,
+	"destination_max_pending_reqs":               typeInt,
+	"destination_max_inflight_reqs":              typeInt,
+	"retrans_per_kbyte_max":                      typeInt,
+	"cmd_get_count":                              typeInt,
+	"cmd_delete_out":                             typeInt,
+	"cmd_lease_get":                              typeInt,
+	"cmd_set":                                    typeInt,
+	"cmd_get_out_all":                            typeInt,
+	"cmd_get_out":                                typeInt,
+	"cmd_lease_set_count":                        typeInt,
+	"cmd_other_out_all":                          typeInt,
+	"cmd_lease_get_out":                          typeInt,
+	"cmd_set_count":                              typeInt,
+	"cmd_lease_set_out":                          typeInt,
+	"cmd_delete_count":                           typeInt,
+	"cmd_other":                                  typeInt,
+	"cmd_delete":                                 typeInt,
+	"cmd_get":                                    typeInt,
+	"cmd_lease_set":                              typeInt,
+	"cmd_set_out":                                typeInt,
+	"cmd_lease_get_count":                        typeInt,
+	"cmd_other_out":                              typeInt,
+	"cmd_lease_get_out_all":                      typeInt,
+	"cmd_set_out_all":                            typeInt,
+	"cmd_other_count":                            typeInt,
+	"cmd_delete_out_all":                         typeInt,
+	"cmd_lease_set_out_all":                      typeInt,
+}
+
+// SampleConfig returns sample configuration message
+func (m *Mcrouter) SampleConfig() string {
+	return sampleConfig
+}
+
+// Description returns description of Mcrouter plugin
+func (m *Mcrouter) Description() string {
+	return "Read metrics from one or many mcrouter servers"
+}
+
+// Gather reads stats from all configured servers accumulates stats
+func (m *Mcrouter) Gather(acc telegraf.Accumulator) error {
+	ctx := context.Background()
+
+	if m.Timeout.Duration < 1*time.Second {
+		m.Timeout.Duration = defaultTimeout
+	}
+
+	ctx, cancel := context.WithTimeout(ctx, m.Timeout.Duration)
+	defer cancel()
+
+	if len(m.Servers) == 0 {
+		m.Servers = []string{defaultServerURL.String()}
+	}
+
+	for _, serverAddress := range m.Servers {
+		acc.AddError(m.gatherServer(ctx, serverAddress, acc))
+	}
+
+	return nil
+}
+
+func (m *Mcrouter) gatherServer(ctx context.Context, address string, acc telegraf.Accumulator) error {
+	var conn net.Conn
+	var err error
+	var protocol string
+	var host string
+	var port string
+	var dialer net.Dialer
+
+	u, parseError := url.Parse(address)
+
+	if parseError != nil {
+		return fmt.Errorf("Invalid server address")
+	}
+
+	if u.Scheme != "tcp" && u.Scheme != "unix" {
+		protocol = defaultServerURL.Scheme
+	} else {
+		protocol = u.Scheme
+	}
+
+	if protocol == "unix" {
+		if u.Path == "" {
+			return fmt.Errorf("Invalid unix socket path")
+		}
+
+		address = u.Path
+	} else {
+		if u.Host == "" {
+			u.Host = defaultServerURL.Host
+		}
+
+		host, port, err = net.SplitHostPort(u.Host)
+
+		if err != nil {
+			host = defaultServerURL.Hostname()
+			port = defaultServerURL.Port()
+		}
+
+		address = host + ":" + port
+	}
+
+	conn, err = dialer.DialContext(ctx, protocol, address)
+
+	if err != nil {
+		return err
+	}
+
+	defer conn.Close()
+
+	// Extend connection
+	deadline, ok := ctx.Deadline()
+
+	if ok {
+		conn.SetDeadline(deadline)
+	}
+
+	// Read and write buffer
+	reader := bufio.NewReader(conn)
+	scanner := bufio.NewScanner(reader)
+
+	// Send command
+	if _, err := fmt.Fprint(conn, "stats\r\n"); err != nil {
+		return err
+	}
+
+	values, err := parseResponse(scanner)
+
+	if err != nil {
+		return err
+	}
+
+	// Add server address as a tag
+	tags := map[string]string{"server": address}
+
+	// Process values
+	fields := make(map[string]interface{})
+	for key, sType := range sendMetrics {
+		if value, ok := values[key]; ok {
+			switch sType {
+			case typeInt:
+				if v, errParse := strconv.ParseInt(value, 10, 64); errParse == nil {
+					fields[key] = v
+				}
+			case typeFloat:
+				if v, errParse := strconv.ParseFloat(value, 64); errParse == nil {
+					fields[key] = v
+				}
+			default:
+			}
+		}
+	}
+	acc.AddFields("mcrouter", fields, tags)
+	return nil
+}
+
+func parseResponse(r *bufio.Scanner) (map[string]string, error) {
+	values := make(map[string]string)
+
+	for r.Scan() {
+		// Read line
+		line := r.Text()
+
+		// Done
+		if line == "END" {
+			break
+		}
+
+		// Read values
+		s := strings.SplitN(line, " ", 3)
+
+		if len(s) != 3 || s[0] != "STAT" {
+			return nil, fmt.Errorf("unexpected line in stats response: %s", line)
+		}
+
+		// Save values
+		values[s[1]] = s[2]
+	}
+
+	return values, nil
+}
+
+func init() {
+	inputs.Add("mcrouter", func() telegraf.Input {
+		return &Mcrouter{}
+	})
+}