From 5a6c135083919c05baa47206d55138c4fe0310ef Mon Sep 17 00:00:00 2001
From: Manuel Pitz <manuel.pitz@eonerc.rwth-aachen.de>
Date: Tue, 22 Mar 2022 18:15:28 +0100
Subject: [PATCH] add renumbering for decimate to allow detection of missed
 samples even if decimating

---
 include/villas/hooks/decimate.hpp | 1 +
 lib/hooks/decimate.cpp            | 9 +++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/villas/hooks/decimate.hpp b/include/villas/hooks/decimate.hpp
index 03ea9e525..6d8f792a1 100644
--- a/include/villas/hooks/decimate.hpp
+++ b/include/villas/hooks/decimate.hpp
@@ -31,6 +31,7 @@ class DecimateHook : public LimitHook {
 
 protected:
 	int ratio;
+	bool renumber;
 	unsigned counter;
 
 public:
diff --git a/lib/hooks/decimate.cpp b/lib/hooks/decimate.cpp
index fc27af2a3..517e1c36d 100644
--- a/lib/hooks/decimate.cpp
+++ b/lib/hooks/decimate.cpp
@@ -21,6 +21,7 @@
  *********************************************************************************/
 
 #include <villas/hooks/decimate.hpp>
+#include <villas/sample.hpp>
 
 namespace villas {
 namespace node {
@@ -43,8 +44,9 @@ void DecimateHook::parse(json_t *json)
 
 	Hook::parse(json);
 
-	ret = json_unpack_ex(json, &err, 0, "{ s: i }",
-		"ratio", &ratio
+	ret = json_unpack_ex(json, &err, 0, "{ s: i, s?: b }",
+		"ratio", &ratio,
+		"renumber", &renumber
 	);
 	if (ret)
 		throw ConfigError(json, err, "node-config-hook-decimate");
@@ -56,6 +58,9 @@ Hook::Reason DecimateHook::process(struct Sample *smp)
 {
 	assert(state == State::STARTED);
 
+	if (renumber)
+		smp->sequence /= ratio;
+
 	if (ratio && counter++ % ratio != 0)
 		return Hook::Reason::SKIP_SAMPLE;