From: Michael Tremer <michael.tremer@ipfire.org>
Date: Wed, 1 Oct 2025 17:06:09 +0000 (+0000)
Subject: graph: Create the basic to render a graph
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c02cf46624e88c244e55bbed8c8149694c246e0e;p=collecty.git

graph: Create the basic to render a graph

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---

diff --git a/src/daemon/graph.c b/src/daemon/graph.c
index 696ad4b..39d8069 100644
--- a/src/daemon/graph.c
+++ b/src/daemon/graph.c
@@ -21,6 +21,9 @@
 #include <errno.h>
 #include <stdlib.h>
 
+#include <rrd.h>
+
+#include "args.h"
 #include "ctx.h"
 #include "daemon.h"
 #include "graph.h"
@@ -107,15 +110,55 @@ char* collecty_graph_get_bus_path(collecty_graph* self) {
 
 int collecty_graph_render(collecty_graph* self,
 		const char* object, char** buffer, size_t* length) {
-	char* p = NULL;
+	collecty_args* args = NULL;
+	FILE* f = NULL;
+	int w = 0;
+	int h = 0;
 	int r;
 
-	r = asprintf(&p, "GRAPH");
+	// Log action
+	DEBUG(self->ctx, "Rendering %s...\n", collecty_graph_get_name(self));
+
+	// Open a file handle to the output buffer
+	f = open_memstream(buffer, length);
+	if (!f) {
+		ERROR(self->ctx, "Failed to open memory stream: %m\n");
+		r = -errno;
+		goto ERROR;
+	}
+
+	// Allocate a new argument list
+	r = collecty_args_create(&args, self->ctx);
 	if (r < 0)
-		return r;
+		goto ERROR;
 
-	*buffer = p;
-	*length = r;
+	// XXX TODO Fill this with content
 
-	return 0;
+	// Dump the command
+	r = collecty_args_dump(args);
+	if (r < 0)
+		goto ERROR;
+
+	// Render the graph
+	r = rrd_graph(collecty_args_argc(args), (char**)collecty_args_argv(args),
+			NULL, &w, &h, f, NULL, NULL);
+	if (r < 0) {
+		ERROR(self->ctx, "Failed to generate the graph: %s\n", rrd_get_error());
+		rrd_clear_error();
+		r = -ENOTSUP;
+		goto ERROR;
+	}
+
+	// Log action
+	DEBUG(self->ctx, "Rendered graph %s:\n", collecty_graph_get_name(self));
+	DEBUG(self->ctx, "    Width  : %d\n", w);
+	DEBUG(self->ctx, "    Height : %d\n", h);
+
+ERROR:
+	if (args)
+		collecty_args_unref(args);
+	if (f)
+		fclose(f);
+
+	return r;
 }