From 008fc679742b1f6dc386b728887573987ac09feb Mon Sep 17 00:00:00 2001
From: Sebastiaan van Stijn <github@gone.nl>
Date: Tue, 16 Apr 2019 12:42:54 +0200
Subject: [PATCH] Fluentd: add fluentd-request-ack option

This adds a new `fluentd-request-ack` logging option for the Fluentd
logging driver. If enabled, the server will respond with an acknowledgement.
This option improves the reliability of the message transmission. This
change is not versioned, and affects all API versions.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
---
 daemon/logger/fluentd/fluentd.go | 10 ++++++++++
 docs/api/version-history.md      |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/daemon/logger/fluentd/fluentd.go b/daemon/logger/fluentd/fluentd.go
index 748dba5352..829b606c9f 100644
--- a/daemon/logger/fluentd/fluentd.go
+++ b/daemon/logger/fluentd/fluentd.go
@@ -53,6 +53,7 @@ const (
 	asyncConnectKey       = "fluentd-async-connect" // deprecated option (use fluent-async instead)
 	bufferLimitKey        = "fluentd-buffer-limit"
 	maxRetriesKey         = "fluentd-max-retries"
+	requestAckKey         = "fluentd-request-ack"
 	retryWaitKey          = "fluentd-retry-wait"
 	subSecondPrecisionKey = "fluentd-sub-second-precision"
 )
@@ -148,6 +149,7 @@ func ValidateLogOpt(cfg map[string]string) error {
 		case asyncConnectKey:
 		case bufferLimitKey:
 		case maxRetriesKey:
+		case requestAckKey:
 		case retryWaitKey:
 		case subSecondPrecisionKey:
 			// Accepted
@@ -221,6 +223,13 @@ func parseConfig(cfg map[string]string) (fluent.Config, error) {
 		}
 	}
 
+	requestAck := false
+	if cfg[requestAckKey] != "" {
+		if requestAck, err = strconv.ParseBool(cfg[requestAckKey]); err != nil {
+			return config, err
+		}
+	}
+
 	config = fluent.Config{
 		FluentPort:         loc.port,
 		FluentHost:         loc.host,
@@ -232,6 +241,7 @@ func parseConfig(cfg map[string]string) (fluent.Config, error) {
 		Async:              async,
 		AsyncConnect:       asyncConnect,
 		SubSecondPrecision: subSecondPrecision,
+		RequestAck:         requestAck,
 	}
 
 	return config, nil
diff --git a/docs/api/version-history.md b/docs/api/version-history.md
index dca2149785..8d583ee99a 100644
--- a/docs/api/version-history.md
+++ b/docs/api/version-history.md
@@ -90,6 +90,12 @@ keywords: "API, Docker, rcli, REST, documentation"
   option, which remains funtional, but will be removed in a future release. Users
   are encouraged to use the `fluentd-async` option going forward. This change is
   not versioned, and affects all API versions if the daemon has this patch.
+* `POST /containers/create` now accepts a `fluentd-request-ack` option in
+  `HostConfig.LogConfig.Config` when using the Fluentd logging driver. If enabled,
+  the Fluentd logging driver sends the chunk option with a unique ID. The server
+  will respond with an acknowledgement. This option improves the reliability of
+  the message transmission. This change is not versioned, and affects all API
+  versions if the daemon has this patch.
 * `POST /containers/create`, `GET /containers/{id}/json`, and `GET /containers/json` now supports
   `BindOptions.NonRecursive`.
 * `POST /swarm/init` now accepts a `DataPathPort` property to set data path port number.