Renamed redis.index option to redis.key

The "index" setting name has historical reasons, from the times that
all outputs shared the same configuration options. Since the meaning and
contents of the "index" setting are starting to vary per output, it's time
to clean this up. The Redis "index" is now called "key".

Before this change, the index was still somehow special, since it was set to
the beatName outside of the output. This removes this hack, and sets index to
beatName only in the Elasticsearch and Logstash modules.

This also removes the `index` setting for the file output, but that was never
documented.

Part of #2074.

CHANGELOG.asciidoc

@@ -13,9 +13,12 @@ https://github.com/elastic/beats/compare/v5.0.0-alpha4...master[Check the HEAD d
 ==== Breaking changes
 
 *Affecting all Beats*
+
 - Rename the `filters` section to `processors`. {pull}1944[1944]
 - Introduce the condition with `when` in the processor configuration. {pull}1949[1949]
 - The Elasticsearch template is now loaded by default. {pull}1993[1993]
+- The Redis output `index` setting is renamed to `key`. `index` still works but it's deprecated. {pull}2077[2077]
+- The undocumented file output `index` setting was removed. Use `filename` instead. {pull}2077[2077]
 
 *Metricbeat*
 

libbeat/docs/outputconfig.asciidoc

@@ -631,8 +631,8 @@ output.redis:
   # password is set.
   password: "my_password"
 
-  # Optional index name. The default is {beatname_lc} and generates {beatname_lc} keys.
-  index: "{beatname_lc}"
+  # Optional key name. The default is {beatname_lc}
+  key: "{beatname_lc}"
 
   # Optional Redis database number where the events are stored
   # The default is 0.
@@ -668,6 +668,13 @@ The Redis port to use if `hosts` does not contain a port number. The default is
 
 ===== index
 
+deprecated[5.0.0-alpha5,The `index` setting is renamed to `key.]
+
+The name of the Redis list or channel the events are published to. The default is
+"{beatname_lc}".
+
+===== key
+
 The name of the Redis list or channel the events are published to. The default is
 "{beatname_lc}".
 

libbeat/outputs/elasticsearch/output.go

@@ -56,6 +56,10 @@ func New(beatName string, cfg *common.Config, topologyExpire int) (outputs.Outpu
 		cfg.SetInt("bulk_max_size", -1, defaultBulkSize)
 	}
 
+	if !cfg.HasField("index") {
+		cfg.SetString("index", -1, beatName)
+	}
+
 	output := &elasticsearchOutput{beatName: beatName}
 	err := output.init(cfg, topologyExpire)
 	if err != nil {

libbeat/outputs/fileout/config.go

@@ -7,7 +7,6 @@ import (
 )
 
 type config struct {
-	Index         string `config:"index"`
 	Path          string `config:"path"`
 	Filename      string `config:"filename"`
 	RotateEveryKb int    `config:"rotate_every_kb" validate:"min=1"`
@@ -22,10 +21,6 @@ var (
 )
 
 func (c *config) Validate() error {
-	if c.Filename == "" && c.Index == "" {
-		return fmt.Errorf("File logging requires filename or index being set.")
-	}
-
 	if c.NumberOfFiles < 2 || c.NumberOfFiles > logp.RotatorMaxFiles {
 		return fmt.Errorf("The number_of_files to keep should be between 2 and %v",
 			logp.RotatorMaxFiles)

libbeat/outputs/logstash/logstash.go

@@ -47,6 +47,11 @@ func init() {
 }
 
 func new(beatName string, cfg *common.Config, _ int) (outputs.Outputer, error) {
+
+	if !cfg.HasField("index") {
+		cfg.SetString("index", -1, beatName)
+	}
+
 	output := &logstash{}
 	if err := output.init(cfg); err != nil {
 		return nil, err

libbeat/outputs/outputs.go

@@ -76,10 +76,6 @@ func InitOutputs(
 			continue
 		}
 
-		if !config.HasField("index") {
-			config.SetString("index", -1, beatName)
-		}
-
 		output, err := plugin(beatName, config, topologyExpire)
 		if err != nil {
 			logp.Err("failed to initialize %s plugin as output: %s", name, err)

libbeat/outputs/redis/config.go

@@ -5,13 +5,15 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/elastic/beats/libbeat/logp"
 	"github.com/elastic/beats/libbeat/outputs"
 	"github.com/elastic/beats/libbeat/outputs/transport"
 )
 
 type redisConfig struct {
 	Password    string                `config:"password"`
 	Index       string                `config:"index"`
+	Key         string                `config:"key"`
 	Port        int                   `config:"port"`
 	LoadBalance bool                  `config:"loadbalance"`
 	Timeout     time.Duration         `config:"timeout"`
@@ -49,8 +51,14 @@ func (c *redisConfig) Validate() error {
 		return fmt.Errorf("redis data type %v not supported", c.DataType)
 	}
 
-	if c.Index == "" {
-		return errors.New("index required")
+	if c.Key != "" && c.Index != "" {
+		return errors.New("Cannot use both `output.redis.key` and `output.redis.index` configuration options." +
+			" Set only `output.redis.key`")
+	}
+
+	if c.Key == "" && c.Index != "" {
+		c.Key = c.Index
+		logp.Warn("The `output.redis.index` configuration setting is deprecated. Use `output.redis.key` instead.")
 	}
 
 	return nil

libbeat/outputs/redis/config_test.go

@@ -0,0 +1,30 @@
+package redis
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidate(t *testing.T) {
+	type io struct {
+		Name  string
+		Input redisConfig
+		Valid bool
+	}
+
+	tests := []io{
+		io{"No config", redisConfig{Key: "", Index: ""}, true},
+		io{"Only key", redisConfig{Key: "test", Index: ""}, true},
+		io{"Only index", redisConfig{Key: "", Index: "test"}, true},
+		io{"Both", redisConfig{Key: "test", Index: "test"}, false},
+
+		io{"Invalid Datatype", redisConfig{Key: "test", DataType: "something"}, false},
+		io{"List Datatype", redisConfig{Key: "test", DataType: "list"}, true},
+		io{"Channel Datatype", redisConfig{Key: "test", DataType: "channel"}, true},
+	}
+
+	for _, test := range tests {
+		assert.Equal(t, test.Input.Validate() == nil, test.Valid, test.Name)
+	}
+}

libbeat/outputs/redis/redis.go

@@ -3,7 +3,6 @@ package redis
 import (
 	"errors"
 	"expvar"
-	"fmt"
 	"time"
 
 	"github.com/elastic/beats/libbeat/common"
@@ -18,6 +17,7 @@ import (
 type redisOut struct {
 	mode mode.ConnectionMode
 	topology
+	beatName string
 }
 
 var debugf = logp.MakeDebug("redis")
@@ -40,7 +40,7 @@ func init() {
 }
 
 func new(beatName string, cfg *common.Config, expireTopo int) (outputs.Outputer, error) {
-	r := &redisOut{}
+	r := &redisOut{beatName: beatName}
 	if err := r.init(cfg, expireTopo); err != nil {
 		return nil, err
 	}
@@ -69,9 +69,9 @@ func (r *redisOut) init(cfg *common.Config, expireTopo int) error {
 		return errors.New("Bad Redis data type")
 	}
 
-	index := []byte(config.Index)
-	if len(index) == 0 {
-		return fmt.Errorf("missing %v", cfg.PathOf("index"))
+	key := []byte(config.Key)
+	if len(key) == 0 {
+		key = []byte(r.beatName)
 	}
 
 	tls, err := outputs.LoadTLSConfig(config.TLS)
@@ -105,7 +105,7 @@ func (r *redisOut) init(cfg *common.Config, expireTopo int) error {
 		if err != nil {
 			return nil, err
 		}
-		return newClient(t, config.Password, config.Db, index, dataType), nil
+		return newClient(t, config.Password, config.Db, key, dataType), nil
 	})
 	if err != nil {
 		return err

libbeat/outputs/redis/redis_integration_test.go

@@ -25,11 +25,11 @@ const (
 
 func TestTopologyInRedisTCP(t *testing.T) {
 	db := 1
-	index := "test_topo_tcp"
+	key := "test_topo_tcp"
 	redisHosts := []string{getRedisAddr()}
 	redisConfig := map[string]interface{}{
 		"hosts":         redisHosts,
-		"index":         index,
+		"key":           key,
 		"host_topology": redisHosts[0],
 		"db_topology":   db,
 		"timeout":       "5s",
@@ -40,11 +40,11 @@ func TestTopologyInRedisTCP(t *testing.T) {
 
 func TestTopologyInRedisTLS(t *testing.T) {
 	db := 1
-	index := "test_topo_tls"
+	key := "test_topo_tls"
 	redisHosts := []string{getSRedisAddr()}
 	redisConfig := map[string]interface{}{
 		"hosts":         redisHosts,
-		"index":         index,
+		"key":           key,
 		"host_topology": redisHosts[0],
 		"db_topology":   db,
 		"timeout":       "5s",
@@ -70,7 +70,7 @@ func testTopologyInRedis(t *testing.T, cfg map[string]interface{}) {
 	}
 
 	db := 0
-	index := cfg["index"].(string)
+	key := cfg["key"].(string)
 	if v, ok := cfg["db_topology"]; ok {
 		db = v.(int)
 	}
@@ -83,7 +83,7 @@ func testTopologyInRedis(t *testing.T, cfg map[string]interface{}) {
 		}
 		// delete old key if present
 		defer conn.Close()
-		conn.Do("DEL", index)
+		conn.Do("DEL", key)
 	}
 
 	// 1. connect
@@ -116,11 +116,11 @@ func testTopologyInRedis(t *testing.T, cfg map[string]interface{}) {
 }
 
 func TestPublishListTCP(t *testing.T) {
-	index := "test_publist_tcp"
+	key := "test_publist_tcp"
 	db := 0
 	redisConfig := map[string]interface{}{
 		"hosts":    []string{getRedisAddr()},
-		"index":    index,
+		"key":      key,
 		"db":       db,
 		"datatype": "list",
 		"timeout":  "5s",
@@ -130,11 +130,11 @@ func TestPublishListTCP(t *testing.T) {
 }
 
 func TestPublishListTLS(t *testing.T) {
-	index := "test_publist_tls"
+	key := "test_publist_tls"
 	db := 0
 	redisConfig := map[string]interface{}{
 		"hosts":    []string{getSRedisAddr()},
-		"index":    index,
+		"key":      key,
 		"db":       db,
 		"datatype": "list",
 		"timeout":  "5s",
@@ -154,7 +154,7 @@ func testPublishList(t *testing.T, cfg map[string]interface{}) {
 	total := batches & batchSize
 
 	db := 0
-	index := cfg["index"].(string)
+	key := cfg["key"].(string)
 	if v, ok := cfg["db"]; ok {
 		db = v.(int)
 	}
@@ -166,15 +166,15 @@ func testPublishList(t *testing.T, cfg map[string]interface{}) {
 
 	// delete old key if present
 	defer conn.Close()
-	conn.Do("DEL", index)
+	conn.Do("DEL", key)
 
 	out := newRedisTestingOutput(t, cfg)
 	err = sendTestEvents(out, batches, batchSize)
 	assert.NoError(t, err)
 
 	results := make([][]byte, total)
 	for i := range results {
-		results[i], err = redis.Bytes(conn.Do("LPOP", index))
+		results[i], err = redis.Bytes(conn.Do("LPOP", key))
 		assert.NoError(t, err)
 	}
 
@@ -188,10 +188,10 @@ func testPublishList(t *testing.T, cfg map[string]interface{}) {
 
 func TestPublishChannelTCP(t *testing.T) {
 	db := 0
-	index := "test_pubchan_tcp"
+	key := "test_pubchan_tcp"
 	redisConfig := map[string]interface{}{
 		"hosts":    []string{getRedisAddr()},
-		"index":    index,
+		"key":      key,
 		"db":       db,
 		"datatype": "channel",
 		"timeout":  "5s",
@@ -202,10 +202,10 @@ func TestPublishChannelTCP(t *testing.T) {
 
 func TestPublishChannelTLS(t *testing.T) {
 	db := 0
-	index := "test_pubchan_tls"
+	key := "test_pubchan_tls"
 	redisConfig := map[string]interface{}{
 		"hosts":    []string{getSRedisAddr()},
-		"index":    index,
+		"key":      key,
 		"db":       db,
 		"datatype": "channel",
 		"timeout":  "5s",
@@ -225,7 +225,7 @@ func testPublishChannel(t *testing.T, cfg map[string]interface{}) {
 	total := batches & batchSize
 
 	db := 0
-	index := cfg["index"].(string)
+	key := cfg["key"].(string)
 	if v, ok := cfg["db"]; ok {
 		db = v.(int)
 	}
@@ -237,14 +237,14 @@ func testPublishChannel(t *testing.T, cfg map[string]interface{}) {
 
 	// delete old key if present
 	defer conn.Close()
-	conn.Do("DEL", index)
+	conn.Do("DEL", key)
 
 	// subscribe to packetbeat channel
 	psc := redis.PubSubConn{conn}
-	if err := psc.Subscribe(index); err != nil {
+	if err := psc.Subscribe(key); err != nil {
 		t.Fatal(err)
 	}
-	defer psc.Unsubscribe(index)
+	defer psc.Unsubscribe(key)
 
 	// connect and publish events
 	var wg sync.WaitGroup