From 1e495560780fc411dffece51542695e35a5642cb Mon Sep 17 00:00:00 2001
From: Luke Dashjr <luke-jr+git@utopios.org>
Date: Wed, 27 Apr 2016 05:53:37 +0000
Subject: [PATCH] Implement BIP 9 template request "rules" parameter

---
 blkmaker.c         |  4 ++++
 blkmaker_jansson.c | 27 ++++++++++++++++++++++++++-
 private.h          |  1 +
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/blkmaker.c b/blkmaker.c
index d7bfcaa..f7d325c 100644
--- a/blkmaker.c
+++ b/blkmaker.c
@@ -18,6 +18,10 @@
 
 #include "private.h"
 
+const char *blkmk_supported_rules[] = {
+	NULL
+};
+
 static inline
 void my_htole32(unsigned char *buf, uint32_t n) {
 	buf[0] = (n >>  0) % 256;
diff --git a/blkmaker_jansson.c b/blkmaker_jansson.c
index 6588978..ecbc52d 100644
--- a/blkmaker_jansson.c
+++ b/blkmaker_jansson.c
@@ -28,7 +28,8 @@
 #	error "Jansson 2.0 with long long support required!"
 #endif
 
-json_t *blktmpl_request_jansson(gbt_capabilities_t caps, const char *lpid) {
+static
+json_t *blktmpl_request_jansson2(const uint32_t caps, const char * const lpid, const char * const * const rulelist) {
 	json_t *req, *jcaps, *jstr, *reqf, *reqa;
 	if (!(req = json_object()))
 		return NULL;
@@ -67,6 +68,26 @@ json_t *blktmpl_request_jansson(gbt_capabilities_t caps, const char *lpid) {
 		if (json_object_set_new(req, "longpollid", jstr))
 			goto err;
 	}
+	jstr = NULL;
+	
+	// Add rules list
+	if (!(jcaps = json_array())) {
+		goto err;
+	}
+	for (const char * const *currule = rulelist; *currule; ++currule) {
+		if (!(jstr = json_string(*currule))) {
+			goto err;
+		}
+		if (json_array_append_new(jcaps, jstr)) {
+			goto err;
+		}
+	}
+	jstr = NULL;
+	if (json_object_set_new(req, "rules", jcaps))
+		goto err;
+	jcaps = NULL;
+	
+	// Put together main JSON-RPC request Object
 	if (!(jstr = json_string("getblocktemplate")))
 		goto err;
 	if (json_object_set_new(reqf, "method", jstr))
@@ -89,6 +110,10 @@ err:
 	return NULL;
 }
 
+json_t *blktmpl_request_jansson(gbt_capabilities_t caps, const char *lpid) {
+	return blktmpl_request_jansson2(caps, lpid, blkmk_supported_rules);
+}
+
 
 #define my_hex2bin _blkmk_hex2bin
 
diff --git a/private.h b/private.h
index 7908739..14eacf1 100644
--- a/private.h
+++ b/private.h
@@ -5,6 +5,7 @@
 #include <string.h>
 
 // blkmaker.c
+extern const char *blkmk_supported_rules[];
 extern bool _blkmk_dblsha256(void *hash, const void *data, size_t datasz);
 
 // blktemplate.c