:plugin: couchdb_changes
:type: input

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:version: %VERSION%
:release_date: %RELEASE_DATE%
:changelog_url: %CHANGELOG_URL%
:include_path: ../../../../logstash/docs/include
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[id="plugins-{type}-{plugin}"]

=== Couchdb_changes input plugin

include::{include_path}/plugin_header.asciidoc[]

==== Description

This CouchDB input allows you to automatically stream events from the
CouchDB http://guide.couchdb.org/draft/notifications.html[_changes] URI.
Moreover, any "future" changes will automatically be streamed as well making it easy to synchronize
your CouchDB data with any target destination

### Upsert and delete
You can use event metadata to allow for document deletion.
All non-delete operations are treated as upserts

### Starting at a Specific Sequence
The CouchDB input stores the last sequence number value in location defined by `sequence_path`.
You can use this fact to start or resume the stream at a particular sequence.

[id="plugins-{type}s-{plugin}-options"]
==== Couchdb_changes Input Configuration Options

This plugin supports the following configuration options plus the <<plugins-{type}s-{plugin}-common-options>> described later.

[cols="<,<,<",options="header",]
|=======================================================================
|Setting |Input type|Required
| <<plugins-{type}s-{plugin}-always_reconnect>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-ca_file>> |a valid filesystem path|No
| <<plugins-{type}s-{plugin}-db>> |<<string,string>>|Yes
| <<plugins-{type}s-{plugin}-heartbeat>> |<<number,number>>|No
| <<plugins-{type}s-{plugin}-host>> |<<string,string>>|No
| <<plugins-{type}s-{plugin}-ignore_attachments>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-initial_sequence>> |<<number,number>>|No
| <<plugins-{type}s-{plugin}-keep_id>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-keep_revision>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-password>> |<<password,password>>|No
| <<plugins-{type}s-{plugin}-port>> |<<number,number>>|No
| <<plugins-{type}s-{plugin}-reconnect_delay>> |<<number,number>>|No
| <<plugins-{type}s-{plugin}-secure>> |<<boolean,boolean>>|No
| <<plugins-{type}s-{plugin}-sequence_path>> |<<string,string>>|No
| <<plugins-{type}s-{plugin}-timeout>> |<<number,number>>|No
| <<plugins-{type}s-{plugin}-username>> |<<string,string>>|No
|=======================================================================

Also see <<plugins-{type}s-{plugin}-common-options>> for a list of options supported by all
input plugins.

&nbsp;

[id="plugins-{type}s-{plugin}-always_reconnect"]
===== `always_reconnect` 

  * Value type is <<boolean,boolean>>
  * Default value is `true`

Reconnect flag.  When true, always try to reconnect after a failure

[id="plugins-{type}s-{plugin}-ca_file"]
===== `ca_file` 

  * Value type is <<path,path>>
  * There is no default value for this setting.

Path to a CA certificate file, used to validate certificates

[id="plugins-{type}s-{plugin}-db"]
===== `db` 

  * This is a required setting.
  * Value type is <<string,string>>
  * There is no default value for this setting.

The CouchDB db to connect to.
Required parameter.

[id="plugins-{type}s-{plugin}-heartbeat"]
===== `heartbeat` 

  * Value type is <<number,number>>
  * Default value is `1000`

Logstash connects to CouchDB's _changes with feed=continuous
The heartbeat is how often (in milliseconds) Logstash will ping
CouchDB to ensure the connection is maintained.  Changing this
setting is not recommended unless you know what you are doing.

[id="plugins-{type}s-{plugin}-host"]
===== `host` 

  * Value type is <<string,string>>
  * Default value is `"localhost"`

IP or hostname of your CouchDB instance

[id="plugins-{type}s-{plugin}-ignore_attachments"]
===== `ignore_attachments` 

  * Value type is <<boolean,boolean>>
  * Default value is `true`

Future feature! Until implemented, changing this from the default
will not do anything.

Ignore attachments associated with CouchDB documents.

[id="plugins-{type}s-{plugin}-initial_sequence"]
===== `initial_sequence` 

  * Value type is <<number,number>>
  * There is no default value for this setting.

If unspecified, Logstash will attempt to read the last sequence number
from the `sequence_path` file.  If that is empty or non-existent, it will
begin with 0 (the beginning).

If you specify this value, it is anticipated that you will
only be doing so for an initial read under special circumstances
and that you will unset this value afterwards.

[id="plugins-{type}s-{plugin}-keep_id"]
===== `keep_id` 

  * Value type is <<boolean,boolean>>
  * Default value is `false`

Preserve the CouchDB document id "_id" value in the
output.

[id="plugins-{type}s-{plugin}-keep_revision"]
===== `keep_revision` 

  * Value type is <<boolean,boolean>>
  * Default value is `false`

Preserve the CouchDB document revision "_rev" value in the
output.

[id="plugins-{type}s-{plugin}-password"]
===== `password` 

  * Value type is <<password,password>>
  * Default value is `nil`

Password, if authentication is needed to connect to
CouchDB

[id="plugins-{type}s-{plugin}-port"]
===== `port` 

  * Value type is <<number,number>>
  * Default value is `5984`

Port of your CouchDB instance.

[id="plugins-{type}s-{plugin}-reconnect_delay"]
===== `reconnect_delay` 

  * Value type is <<number,number>>
  * Default value is `10`

Reconnect delay: time between reconnect attempts, in seconds.

[id="plugins-{type}s-{plugin}-secure"]
===== `secure` 

  * Value type is <<boolean,boolean>>
  * Default value is `false`

Connect to CouchDB's _changes feed securely (via https)
Default: false (via http)

[id="plugins-{type}s-{plugin}-sequence_path"]
===== `sequence_path` 

  * Value type is <<string,string>>
  * There is no default value for this setting.

File path where the last sequence number in the _changes
stream is stored. If unset it will write to `$HOME/.couchdb_seq`

[id="plugins-{type}s-{plugin}-timeout"]
===== `timeout` 

  * Value type is <<number,number>>
  * There is no default value for this setting.

Timeout: Number of milliseconds to wait for new data before
terminating the connection.  If a timeout is set it will disable
the heartbeat configuration option.

[id="plugins-{type}s-{plugin}-username"]
===== `username` 

  * Value type is <<string,string>>
  * Default value is `nil`

Username, if authentication is needed to connect to
CouchDB



[id="plugins-{type}s-{plugin}-common-options"]
include::{include_path}/{type}.asciidoc[]