make: splitted reloader

1 files changed, 93 insertions, 0 deletions

diff --git a/src/blogc-make/reloader.c b/src/blogc-make/reloader.c
new file mode 100644
index 0000000..1b55253
--- /dev/null
+++ b/src/blogc-make/reloader.c
@@ -0,0 +1,93 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2014-2017 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file LICENSE.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pthread.h>
+#include "../common/error.h"
+#include "ctx.h"
+#include "rules.h"
+#include "reloader.h"
+
+// we are not going to unit-test these functions, then printing errors
+// directly is not a big issue
+
+
+static void*
+bm_reloader_thread(void *arg)
+{
+    bm_reloader_t *reloader = arg;
+    while (reloader->running) {
+        if (!bm_ctx_reload(reloader->ctx)) {
+            fprintf(stderr, "blogc-make: error: failed to reload context. "
+                "reloader disabled!\n");
+            break;
+        }
+        if (0 != reloader->rule_exec(reloader->ctx, NULL, NULL)) {
+            fprintf(stderr, "blogc-make: error: failed to rebuild website. "
+                "reloader disabled!\n");
+            break;
+        }
+        sleep(1);
+    }
+
+    free(reloader);
+    return NULL;
+}
+
+
+bm_reloader_t*
+bm_reloader_new(bm_ctx_t *ctx, bm_rule_exec_func_t rule_exec)
+{
+    // first rule_exec call is syncronous, to do a 'sanity check'
+    if (0 != rule_exec(ctx, NULL, NULL))
+        return NULL;
+
+    int err;
+
+    pthread_attr_t attr;
+    if (0 != (err = pthread_attr_init(&attr))) {
+        fprintf(stderr, "blogc-make: error: failed to initialize reloader "
+            "thread attributes: %s\n", strerror(err));
+        return NULL;
+    }
+
+    // we run the thread detached, because we don't want to wait it to join
+    // before exiting. the OS can clean it properly
+    if (0 != (err = pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED))) {
+        fprintf(stderr, "blogc-make: error: failed to mark reloader thread as "
+            "detached: %s\n", strerror(err));
+        return NULL;
+    }
+
+    bm_reloader_t *rv = bc_malloc(sizeof(bm_reloader_t));
+    rv->ctx = ctx;
+    rv->rule_exec = rule_exec;
+    rv->running = true;
+
+    pthread_t thread;
+    if (0 != (err = pthread_create(&thread, &attr, bm_reloader_thread, rv))) {
+        fprintf(stderr, "blogc-make: error: failed to create reloader "
+            "thread: %s\n", strerror(err));
+        free(rv);
+        return NULL;
+    }
+
+    return rv;
+}
+
+
+void
+bm_reloader_stop(bm_reloader_t *reloader)
+{
+    if (reloader == NULL)
+        return;
+    reloader->running = false;
+}