add some more code

This adds a basic "worker" program.

You can now do something like

    ./server &
    ./worker &
    ./client ci_run URL REV

and the server should pass a message to worker, after which it should
clone the repository at URL, checkout REV, and try to run the CI script.

It's extremely unfinished: I need to sort out the graceful shutdown, how
the server manages workers, etc.

1 files changed, 92 insertions, 0 deletions

diff --git a/src/ci_queue.c b/src/ci_queue.c
new file mode 100644
index 0000000..d87d3c0
--- /dev/null
+++ b/src/ci_queue.c
@@ -0,0 +1,92 @@
+#include "ci_queue.h"
+#include "log.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <sys/queue.h>
+
+int ci_queue_entry_create(struct ci_queue_entry **entry, const char *_url, const char *_rev)
+{
+	char *url, *rev;
+
+	url = strdup(_url);
+	if (!url) {
+		print_errno("strdup");
+		goto fail;
+	}
+
+	rev = strdup(_rev);
+	if (!rev) {
+		print_errno("strdup");
+		goto free_url;
+	}
+
+	*entry = malloc(sizeof(struct ci_queue_entry));
+	if (!*entry) {
+		print_errno("malloc");
+		goto free_rev;
+	}
+	(*entry)->url = url;
+	(*entry)->rev = rev;
+
+	return 0;
+
+free_rev:
+	free(rev);
+
+free_url:
+	free(url);
+
+fail:
+	return -1;
+}
+
+void ci_queue_entry_destroy(struct ci_queue_entry *entry)
+{
+	free(entry->rev);
+	free(entry->url);
+	free(entry);
+}
+
+void ci_queue_create(struct ci_queue *queue)
+{
+	STAILQ_INIT(queue);
+}
+
+void ci_queue_destroy(struct ci_queue *queue)
+{
+	struct ci_queue_entry *entry1, *entry2;
+
+	entry1 = STAILQ_FIRST(queue);
+	while (entry1) {
+		entry2 = STAILQ_NEXT(entry1, entries);
+		ci_queue_entry_destroy(entry1);
+		entry1 = entry2;
+	}
+	STAILQ_INIT(queue);
+}
+
+int ci_queue_is_empty(const struct ci_queue *queue)
+{
+	return STAILQ_EMPTY(queue);
+}
+
+void ci_queue_push(struct ci_queue *queue, struct ci_queue_entry *entry)
+{
+	STAILQ_INSERT_TAIL(queue, entry, entries);
+}
+
+void ci_queue_push_head(struct ci_queue *queue, struct ci_queue_entry *entry)
+{
+	STAILQ_INSERT_HEAD(queue, entry, entries);
+}
+
+struct ci_queue_entry *ci_queue_pop(struct ci_queue *queue)
+{
+	struct ci_queue_entry *entry;
+
+	entry = STAILQ_FIRST(queue);
+	STAILQ_REMOVE_HEAD(queue, entries);
+
+	return entry;
+}