Init Elasticsearch exporter

exporter/elasticsearchexporter/Makefile

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+include ../../Makefile.Common

exporter/elasticsearchexporter/README.md

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+# Elasticsearch Exporter
+
+This exporter supports sending OpenTelemetry logs to [Elasticsearch](https://www.elastic.co/elasticsearch).
+
+## Configuration options
+
+- `endpoints`: List of Elasticsearch URLs. If endpoints and cloudid is missing, the
+  ELASTICSEARCH_URL environment variable will be used.
+- `cloudid` (optional):
+  [ID](https://www.elastic.co/guide/en/cloud/current/ec-cloud-id.html) of the
+  Elastic Cloud Cluster to publish events to. The `cloudid` can be used instead
+  of `endpoints`.
+- `num_workers` (optional): Number of workers publishing bulk requests concurrently.
+- `index`: The
+  [index](https://www.elastic.co/guide/en/elasticsearch/reference/current/indices.html)
+  or [datastream](https://www.elastic.co/guide/en/elasticsearch/reference/current/data-streams.html)
+  name to publish events to. The default value is `logs-generic-default`.
+- `pipeline` (optional): Optional [Ingest Node](https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest.html)
+  pipeline ID used for processing documents published by the exporter.
+- `flush`: Event bulk buffer flush settings
+  - `bytes` (default=5242880): Write buffer flush limit.
+  - `interval` (default=30s): Write buffer time limit.
+- `retry`: Event retry settings
+  - `enabled` (default=true): Enable/Disable event retry on error. Retry
+    support is enabled by default.
+  - `max_requests` (default=3): Number of HTTP request retries.
+  - `initial_interval` (default=100ms): Initial waiting time if a HTTP request failed.
+  - `max_interval` (default=1m): Max waiting time if a HTTP request failed.
+- `mapping`: Events are encoded to JSON. The `mapping` allows users to
+  configure additional mapping rules.
+  - `mode` (default=ecs): The fields naming mode. valid modes are:
+    - `none`: Use original fields and event structure from the OTLP event.
+    - `ecs`: Try to map fields defined in the
+             [OpenTelemetry Semantic Conventions](https://github.com/open-telemetry/opentelemetry-specification/tree/main/semantic_conventions)
+             to [Elastic Common Schema (ECS)](https://www.elastic.co/guide/en/ecs/current/index.html).
+  - `fields` (optional): Configure additional fields mappings.
+  - `file` (optional): Read additional field mappings from the provided YAML file.
+  - `dedup` (default=true): Try to find and remove duplicate fields/attributes
+    from events before publishing to Elasticsearch. Some structured logging
+    libraries can produce duplicate fields (for example zap). Elasticsearch
+    will reject documents that have duplicate fields.
+  - `dedot` (default=true): When enabled attributes with `.` will be split into
+    proper json objects.
+
+### HTTP settings
+
+- `read_buffer_size` (default=0): Read buffer size.
+- `write_buffer_size` (default=0): Write buffer size used when.
+- `timeout` (default=90s): HTTP request time limit.
+- `headers` (optional): Headers to be send with each HTTP request.
+
+### Security and Authentication settings
+
+- `user` (optional): Username used for HTTP Basic Authentication.
+- `password` (optional): Password used for HTTP Basic Authentication.
+- `api_key` (optional):  Authorization [API Key](https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-create-api-key.html).
+- `ca_file` (optional): Root Certificate Authority (CA) certificate, for
+  verifying the server's identity, if TLS is enabled.
+- `cert_file` (optional): Client TLS certificate.
+- `key_file` (optional): Client TLS key.
+- `insecure` (optional): Disable verification of the server's identity, if TLS
+  is enabled.
+
+### Node Discovery
+
+The Elasticsearch Exporter will check Elasticsearch regularly for available
+nodes and updates the list of hosts if discovery is enabled. Newly discovered
+nodes will automatically be used for load balancing.
+
+- `discover`:
+  - `on_start` (optional): If enabled the exporter queries Elasticsearch
+    for all known nodes in the cluster on startup.
+  - `interval` (optional): Interval to update the list of Elasticsearch nodes.
+
+## Example
+
+```yaml
+exporters:
+  elasticsearch:
+    endpoints:
+    - "https://localhost:9200"
+```

exporter/elasticsearchexporter/config.go

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+// Copyright 2020, OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package elasticsearchexporter
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	"go.opentelemetry.io/collector/config/configmodels"
+	"go.opentelemetry.io/collector/config/configtls"
+)
+
+// Config defines configuration for Elastic exporter.
+type Config struct {
+	configmodels.ExporterSettings `mapstructure:",squash"`
+
+	// Endpoints holds the Elasticsearch URLs the exporter should send events to.
+	//
+	// This setting is required if CloudID is not set and if the
+	// ELASTICSEARCH_URL environment variable is not set.
+	Endpoints []string `mapstructure:"endpoints"`
+
+	// CloudID holds the cloud ID to identify the Elastic Cloud cluster to send events to.
+	// https://www.elastic.co/guide/en/cloud/current/ec-cloud-id.html
+	//
+	// This setting is required if no URL is configured.
+	CloudID string `mapstructure:"cloudid"`
+
+	// NumWorkers configures the number of workers publishing bulk requests.
+	NumWorkers int `mapstructure:"num_workers"`
+
+	// Index configures the index, index alias, or data stream name events should be indexed in.
+	//
+	// https://www.elastic.co/guide/en/elasticsearch/reference/current/indices.html
+	// https://www.elastic.co/guide/en/elasticsearch/reference/current/data-streams.html
+	//
+	// This setting is required.
+	Index string `mapstructure:"index"`
+
+	// Pipeline configures the ingest node pipeline name that should be used to process the
+	// events.
+	//
+	// https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest.html
+	Pipeline string `mapstructure:"pipeline"`
+
+	HTTPClientSettings `mapstructure:",squash"`
+	Discovery          DiscoverySettings `mapstructure:"discover"`
+	Retry              RetrySettings     `mapstructure:"retry"`
+	Flush              FlushSettings     `mapstructure:"flush"`
+	Mapping            MappingsSettings  `mapstructure:"mapping"`
+}
+
+type HTTPClientSettings struct {
+	Authentication AuthenticationSettings `mapstructure:",squash"`
+
+	// ReadBufferSize for HTTP client. See http.Transport.ReadBufferSize.
+	ReadBufferSize int `mapstructure:"read_buffer_size"`
+
+	// WriteBufferSize for HTTP client. See http.Transport.WriteBufferSize.
+	WriteBufferSize int `mapstructure:"write_buffer_size"`
+
+	// Timeout configures the HTTP request timeout.
+	Timeout time.Duration `mapstructure:"timeout"`
+
+	// Headers allows users to configure optional HTTP headers that
+	// will be send with each HTTP request.
+	Headers map[string]string `mapstructure:"headers,omitempty"`
+
+	configtls.TLSClientSetting `mapstructure:",squash"`
+}
+
+// AuthenticationSettings defines user authentication related settings.
+type AuthenticationSettings struct {
+	// User is used to configure HTTP Basic Authentication.
+	User string `mapstructure:"user"`
+
+	// Password is used to configure HTTP Basic Authentication.
+	Password string `mapstructure:"password"`
+
+	// APIKey is used to configure ApiKey based Authentication.
+	//
+	// https://www.elastic.co/guide/en/elasticsearch/reference/current/security-api-create-api-key.html
+	APIKey string `mapstructure:"api_key"`
+}
+
+// DiscoverySettings defines Elasticsearch node discovery related settings.
+// The exporter will check Elasticsearch regularly for available nodes
+// and updates the list of hosts if discovery is enabled. Newly discovered
+// nodes will automatically be used for load balancing.
+//
+// DiscoverySettings should not be enabled when operating Elasticsearch behind a proxy
+// or load balancer.
+//
+// https://www.elastic.co/blog/elasticsearch-sniffing-best-practices-what-when-why-how
+type DiscoverySettings struct {
+	// OnStart, if set, instructs the exporter to look for available Elasticsearch
+	// nodes the first time the exporter connects to the cluster.
+	OnStart bool `mapstructure:"on_start"`
+
+	// Interval instructs the exporter to renew the list of Elasticsearch URLs
+	// with the given interval. URLs will not be updated if Interval is <=0.
+	Interval time.Duration `mapstructure:"interval"`
+}
+
+// FlushSettings  defines settings for configuring the write buffer flushing
+// policy in the Elasticsearch exporter. The exporter sends a bulk request with
+// all events already serialized into the send-buffer.
+type FlushSettings struct {
+	// Bytes sets the send buffer flushing limit.
+	Bytes int `mapstructure:"bytes"`
+
+	// Interval configures the max age of a document in the send buffer.
+	Interval time.Duration `mapstructure:"interval"`
+}
+
+// RetrySettings defines settings for the HTTP request retries in the Elasticsearch exporter.
+// Failed sends are retried with exponential backoff.
+type RetrySettings struct {
+	// Enabled allows users to disable retry without having to comment out all settings.
+	Enabled bool `mapstructure:"enabled"`
+
+	// MaxRequests configures how often an HTTP request is retried before it is assumed to be failed.
+	MaxRequests int `mapstructure:"max_requests"`
+
+	// InitialInterval configures the initial waiting time if a request failed.
+	InitialInterval time.Duration `mapstructure:"initial_interval"`
+
+	// MaxInterval configures the max waiting time if consecutive requests failed.
+	MaxInterval time.Duration `mapstructure:"max_interval"`
+}
+
+type MappingsSettings struct {
+	// Mode configures the field mappings.
+	Mode string `mapstructure:"mode"`
+
+	// Additional field mappings.
+	Fields map[string]string `mapstructure:"fields"`
+
+	// File to read additional fields mappings from.
+	File string `mapstructure:"file"`
+
+	// Try to find and remove duplicate fields
+	Dedup bool `mapstructure:"dedup"`
+
+	Dedot bool `mapstructure:"dedot"`
+}
+
+type MappingMode int
+
+const (
+	MappingNone MappingMode = iota
+	MappingECS
+)
+
+var (
+	errConfigNoEndpoint    = errors.New("endpoints or cloudid must be specified")
+	errConfigEmptyEndpoint = errors.New("endpoints must not include empty entries")
+	errConfigNoIndex       = errors.New("index must be specified")
+)
+
+func (m MappingMode) String() string {
+	switch m {
+	case MappingNone:
+		return ""
+	case MappingECS:
+		return "ecs"
+	default:
+		return ""
+	}
+}
+
+var mappingModes = func() map[string]MappingMode {
+	table := map[string]MappingMode{}
+	for _, m := range []MappingMode{
+		MappingNone,
+		MappingECS,
+	} {
+		table[strings.ToLower(m.String())] = m
+	}
+
+	// config aliases
+	table["no"] = MappingNone
+	table["none"] = MappingNone
+
+	return table
+}()
+
+const defaultElasticsearchEnvName = "ELASTICSEARCH_URL"
+
+// Validate validates the elasticsearch server configuration.
+func (cfg *Config) Validate() error {
+	if len(cfg.Endpoints) == 0 && cfg.CloudID == "" {
+		if os.Getenv(defaultElasticsearchEnvName) == "" {
+			return errConfigNoEndpoint
+		}
+	}
+
+	for _, endpoint := range cfg.Endpoints {
+		if endpoint == "" {
+			return errConfigEmptyEndpoint
+		}
+	}
+
+	if cfg.Index == "" {
+		return errConfigNoIndex
+	}
+
+	if _, ok := mappingModes[cfg.Mapping.Mode]; !ok {
+		return fmt.Errorf("unknown mapping mode %v", cfg.Mapping.Mode)
+	}
+
+	return nil
+}