1 files changed, 345 insertions, 0 deletions

diff --git a/src/transports/smart.c b/src/transports/smart.c
new file mode 100644
index 000000000..416eb221f
--- /dev/null
+++ b/src/transports/smart.c
@@ -0,0 +1,345 @@
+/*
+ * Copyright (C) the libgit2 contributors. All rights reserved.
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#include "git2.h"
+#include "smart.h"
+#include "refs.h"
+
+static int git_smart__recv_cb(gitno_buffer *buf)
+{
+	transport_smart *t = (transport_smart *) buf->cb_data;
+	size_t old_len, bytes_read;
+	int error;
+
+	assert(t->current_stream);
+
+	old_len = buf->offset;
+
+	if ((error = t->current_stream->read(t->current_stream, buf->data + buf->offset, buf->len - buf->offset, &bytes_read)) < 0)
+		return error;
+
+	buf->offset += bytes_read;
+
+	if (t->packetsize_cb)
+		t->packetsize_cb(bytes_read, t->packetsize_payload);
+
+	return (int)(buf->offset - old_len);
+}
+
+GIT_INLINE(int) git_smart__reset_stream(transport_smart *t, bool close_subtransport)
+{
+	if (t->current_stream) {
+		t->current_stream->free(t->current_stream);
+		t->current_stream = NULL;
+	}
+
+	if (close_subtransport &&
+		t->wrapped->close(t->wrapped) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int git_smart__set_callbacks(
+	git_transport *transport,
+	git_transport_message_cb progress_cb,
+	git_transport_message_cb error_cb,
+	void *message_cb_payload)
+{
+	transport_smart *t = (transport_smart *)transport;
+
+	t->progress_cb = progress_cb;
+	t->error_cb = error_cb;
+	t->message_cb_payload = message_cb_payload;
+
+	return 0;
+}
+
+static int git_smart__connect(
+	git_transport *transport,
+	const char *url,
+	git_cred_acquire_cb cred_acquire_cb,
+	void *cred_acquire_payload,
+	int direction,
+	int flags)
+{
+	transport_smart *t = (transport_smart *)transport;
+	git_smart_subtransport_stream *stream;
+	int error;
+	git_pkt *pkt;
+	git_pkt_ref *first;
+	git_smart_service_t service;
+
+	if (git_smart__reset_stream(t, true) < 0)
+		return -1;
+
+	t->url = git__strdup(url);
+	GITERR_CHECK_ALLOC(t->url);
+
+	t->direction = direction;
+	t->flags = flags;
+	t->cred_acquire_cb = cred_acquire_cb;
+	t->cred_acquire_payload = cred_acquire_payload;
+
+	if (GIT_DIRECTION_FETCH == t->direction)
+		service = GIT_SERVICE_UPLOADPACK_LS;
+	else if (GIT_DIRECTION_PUSH == t->direction)
+		service = GIT_SERVICE_RECEIVEPACK_LS;
+	else {
+		giterr_set(GITERR_NET, "Invalid direction");
+		return -1;
+	}
+
+	if ((error = t->wrapped->action(&stream, t->wrapped, t->url, service)) < 0)
+		return error;
+
+	/* Save off the current stream (i.e. socket) that we are working with */
+	t->current_stream = stream;
+
+	gitno_buffer_setup_callback(NULL, &t->buffer, t->buffer_data, sizeof(t->buffer_data), git_smart__recv_cb, t);
+
+	/* 2 flushes for RPC; 1 for stateful */
+	if ((error = git_smart__store_refs(t, t->rpc ? 2 : 1)) < 0)
+		return error;
+
+	/* Strip the comment packet for RPC */
+	if (t->rpc) {
+		pkt = (git_pkt *)git_vector_get(&t->refs, 0);
+
+		if (!pkt || GIT_PKT_COMMENT != pkt->type) {
+			giterr_set(GITERR_NET, "Invalid response");
+			return -1;
+		} else {
+			/* Remove the comment pkt from the list */
+			git_vector_remove(&t->refs, 0);
+			git__free(pkt);
+		}
+	}
+
+	/* We now have loaded the refs. */
+	t->have_refs = 1;
+
+	first = (git_pkt_ref *)git_vector_get(&t->refs, 0);
+
+	/* Detect capabilities */
+	if (git_smart__detect_caps(first, &t->caps) < 0)
+		return -1;
+
+	/* If the only ref in the list is capabilities^{} with OID_ZERO, remove it */
+	if (1 == t->refs.length && !strcmp(first->head.name, "capabilities^{}") &&
+		git_oid_iszero(&first->head.oid)) {
+		git_vector_clear(&t->refs);
+		git_pkt_free((git_pkt *)first);
+	}
+
+	if (t->rpc && git_smart__reset_stream(t, false) < 0)
+		return -1;
+
+	/* We're now logically connected. */
+	t->connected = 1;
+
+	return 0;
+}
+
+static int git_smart__ls(git_transport *transport, git_headlist_cb list_cb, void *payload)
+{
+	transport_smart *t = (transport_smart *)transport;
+	unsigned int i;
+	git_pkt *p = NULL;
+
+	if (!t->have_refs) {
+		giterr_set(GITERR_NET, "The transport has not yet loaded the refs");
+		return -1;
+	}
+
+	git_vector_foreach(&t->refs, i, p) {
+		git_pkt_ref *pkt = NULL;
+
+		if (p->type != GIT_PKT_REF)
+			continue;
+
+		pkt = (git_pkt_ref *)p;
+
+		if (list_cb(&pkt->head, payload))
+			return GIT_EUSER;
+	}
+
+	return 0;
+}
+
+int git_smart__negotiation_step(git_transport *transport, void *data, size_t len)
+{
+	transport_smart *t = (transport_smart *)transport;
+	git_smart_subtransport_stream *stream;
+	int error;
+
+	if (t->rpc && git_smart__reset_stream(t, false) < 0)
+		return -1;
+
+	if (GIT_DIRECTION_FETCH != t->direction) {
+		giterr_set(GITERR_NET, "This operation is only valid for fetch");
+		return -1;
+	}
+
+	if ((error = t->wrapped->action(&stream, t->wrapped, t->url, GIT_SERVICE_UPLOADPACK)) < 0)
+		return error;
+
+	/* If this is a stateful implementation, the stream we get back should be the same */
+	assert(t->rpc || t->current_stream == stream);
+
+	/* Save off the current stream (i.e. socket) that we are working with */
+	t->current_stream = stream;
+
+	if ((error = stream->write(stream, (const char *)data, len)) < 0)
+		return error;
+
+	gitno_buffer_setup_callback(NULL, &t->buffer, t->buffer_data, sizeof(t->buffer_data), git_smart__recv_cb, t);
+
+	return 0;
+}
+
+int git_smart__get_push_stream(transport_smart *t, git_smart_subtransport_stream **stream)
+{
+	int error;
+
+	if (t->rpc && git_smart__reset_stream(t, false) < 0)
+		return -1;
+
+	if (GIT_DIRECTION_PUSH != t->direction) {
+		giterr_set(GITERR_NET, "This operation is only valid for push");
+		return -1;
+	}
+
+	if ((error = t->wrapped->action(stream, t->wrapped, t->url, GIT_SERVICE_RECEIVEPACK)) < 0)
+		return error;
+
+	/* If this is a stateful implementation, the stream we get back should be the same */
+	assert(t->rpc || t->current_stream == *stream);
+
+	/* Save off the current stream (i.e. socket) that we are working with */
+	t->current_stream = *stream;
+
+	gitno_buffer_setup_callback(NULL, &t->buffer, t->buffer_data, sizeof(t->buffer_data), git_smart__recv_cb, t);
+
+	return 0;
+}
+
+static void git_smart__cancel(git_transport *transport)
+{
+	transport_smart *t = (transport_smart *)transport;
+
+	git_atomic_set(&t->cancelled, 1);
+}
+
+static int git_smart__is_connected(git_transport *transport)
+{
+	transport_smart *t = (transport_smart *)transport;
+
+	return t->connected;
+}
+
+static int git_smart__read_flags(git_transport *transport, int *flags)
+{
+	transport_smart *t = (transport_smart *)transport;
+
+	*flags = t->flags;
+
+	return 0;
+}
+
+static int git_smart__close(git_transport *transport)
+{
+	transport_smart *t = (transport_smart *)transport;
+	git_vector *common = &t->common;
+	unsigned int i;
+	git_pkt *p;
+	int ret;
+
+	ret = git_smart__reset_stream(t, true);
+
+	git_vector_foreach(common, i, p)
+		git_pkt_free(p);
+
+	git_vector_free(common);
+
+	if (t->url) {
+		git__free(t->url);
+		t->url = NULL;
+	}
+
+	t->connected = 0;
+
+	return ret;
+}
+
+static void git_smart__free(git_transport *transport)
+{
+	transport_smart *t = (transport_smart *)transport;
+	git_vector *refs = &t->refs;
+	unsigned int i;
+	git_pkt *p;
+
+	/* Make sure that the current stream is closed, if we have one. */
+	git_smart__close(transport);
+
+	/* Free the subtransport */
+	t->wrapped->free(t->wrapped);
+
+	git_vector_foreach(refs, i, p)
+		git_pkt_free(p);
+
+	git_vector_free(refs);
+
+	git__free(t);
+}
+
+static int ref_name_cmp(const void *a, const void *b)
+{
+	const git_pkt_ref *ref_a = a, *ref_b = b;
+
+	return strcmp(ref_a->head.name, ref_b->head.name);
+}
+
+int git_transport_smart(git_transport **out, git_remote *owner, void *param)
+{
+	transport_smart *t;
+	git_smart_subtransport_definition *definition = (git_smart_subtransport_definition *)param;
+
+	if (!param)
+		return -1;
+
+	t = git__calloc(sizeof(transport_smart), 1);
+	GITERR_CHECK_ALLOC(t);
+
+	t->parent.version = GIT_TRANSPORT_VERSION;
+	t->parent.set_callbacks = git_smart__set_callbacks;
+	t->parent.connect = git_smart__connect;
+	t->parent.close = git_smart__close;
+	t->parent.free = git_smart__free;
+	t->parent.negotiate_fetch = git_smart__negotiate_fetch;
+	t->parent.download_pack = git_smart__download_pack;
+	t->parent.push = git_smart__push;
+	t->parent.ls = git_smart__ls;
+	t->parent.is_connected = git_smart__is_connected;
+	t->parent.read_flags = git_smart__read_flags;
+	t->parent.cancel = git_smart__cancel;
+	
+	t->owner = owner;
+	t->rpc = definition->rpc;
+
+	if (git_vector_init(&t->refs, 16, ref_name_cmp) < 0) {
+		git__free(t);
+		return -1;
+	}
+
+	if (definition->callback(&t->wrapped, &t->parent) < 0) {
+		git__free(t);
+		return -1;
+	}	
+
+	*out = (git_transport *) t;
+	return 0;
+}