dovecot-2.0-sslstream: lib-master: Added anvil client code.

[dovecot at dovecot.org]

details:   http://hg.dovecot.org/dovecot-2.0-sslstream/rev/8ebf82849077
changeset: 10266:8ebf82849077
user:      Timo Sirainen <tss at iki.fi>
date:      Fri Nov 06 13:57:04 2009 -0500
description:
lib-master: Added anvil client code.

diffstat:

3 files changed, 191 insertions(+)
src/lib-master/Makefile.am    |    2 
src/lib-master/anvil-client.c |  169 +++++++++++++++++++++++++++++++++++++++++
src/lib-master/anvil-client.h |   20 ++++

diffs (216 lines):

diff -r 7bdb5816f797 -r 8ebf82849077 src/lib-master/Makefile.am
--- a/src/lib-master/Makefile.am	Fri Nov 06 13:56:10 2009 -0500
+++ b/src/lib-master/Makefile.am	Fri Nov 06 13:57:04 2009 -0500
@@ -9,6 +9,7 @@ AM_CPPFLAGS = \
 	-DBINDIR=\""$(bindir)"\"
 
 libmaster_la_SOURCES = \
+	anvil-client.c \
 	master-auth.c \
 	master-login.c \
 	master-login-auth.c \
@@ -17,6 +18,7 @@ libmaster_la_SOURCES = \
 	syslog-util.c
 
 noinst_HEADERS = \
+	anvil-client.h \
 	master-auth.h \
 	master-interface.h \
 	master-login.h \
diff -r 7bdb5816f797 -r 8ebf82849077 src/lib-master/anvil-client.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/lib-master/anvil-client.c	Fri Nov 06 13:57:04 2009 -0500
@@ -0,0 +1,169 @@
+/* Copyright (c) 2009 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "network.h"
+#include "istream.h"
+#include "ostream.h"
+#include "array.h"
+#include "aqueue.h"
+#include "anvil-client.h"
+
+struct anvil_query {
+	anvil_callback_t *callback;
+	void *context;
+};
+
+struct anvil_client {
+	char *path;
+	int fd;
+	struct istream *input;
+	struct ostream *output;
+	struct io *io;
+
+	ARRAY_DEFINE(queries_arr, struct anvil_query);
+	struct aqueue *queries;
+
+	bool (*reconnect_callback)(void);
+};
+
+#define ANVIL_HANDSHAKE "VERSION\tanvil\t1\t0\n"
+#define ANVIL_INBUF_SIZE 1024
+
+static void anvil_client_disconnect(struct anvil_client *client);
+
+struct anvil_client *
+anvil_client_init(const char *path, bool (*reconnect_callback)(void))
+{
+	struct anvil_client *client;
+
+	client = i_new(struct anvil_client, 1);
+	client->path = i_strdup(path);
+	client->reconnect_callback = reconnect_callback;
+	client->fd = -1;
+	i_array_init(&client->queries_arr, 32);
+	client->queries = aqueue_init(&client->queries_arr.arr);
+	return client;
+}
+
+void anvil_client_deinit(struct anvil_client **_client)
+{
+	struct anvil_client *client = *_client;
+
+	*_client = NULL;
+
+	anvil_client_disconnect(client);
+	array_free(&client->queries_arr);
+	aqueue_deinit(&client->queries);
+	i_free(client->path);
+	i_free(client);
+}
+
+static void anvil_reconnect(struct anvil_client *client)
+{
+	anvil_client_disconnect(client);
+	if (client->reconnect_callback != NULL) {
+		if (!client->reconnect_callback()) {
+			/* no reconnection */
+			return;
+		}
+	}
+	(void)anvil_client_connect(client, FALSE);
+}
+
+static void anvil_input(struct anvil_client *client)
+{
+	const struct anvil_query *queries, *query;
+	const char *line;
+	unsigned int count;
+
+	queries = array_get(&client->queries_arr, &count);
+	while ((line = i_stream_read_next_line(client->input)) != NULL) {
+		if (aqueue_count(client->queries) == 0) {
+			i_error("anvil: Unexpected input: %s", line);
+			continue;
+		}
+
+		query = &queries[aqueue_idx(client->queries, 0)];
+		query->callback(line, query->context);
+		aqueue_delete_tail(client->queries);
+	}
+	if (client->input->stream_errno != 0) {
+		i_error("read(%s) failed: %m", client->path);
+		anvil_reconnect(client);
+	} else if (client->input->eof) {
+		i_error("read(%s) failed: EOF", client->path);
+		anvil_reconnect(client);
+	}
+}
+
+int anvil_client_connect(struct anvil_client *client, bool retry)
+{
+	int fd;
+
+	i_assert(client->fd == -1);
+
+	fd = retry ? net_connect_unix_with_retries(client->path, 5000) :
+		net_connect_unix(client->path);
+	if (fd == -1) {
+		i_error("net_connect_unix(%s) failed: %m", client->path);
+		return -1;
+	}
+
+	client->fd = fd;
+	client->input = i_stream_create_fd(fd, ANVIL_INBUF_SIZE, FALSE);
+	client->output = o_stream_create_fd(fd, (size_t)-1, FALSE);
+	client->io = io_add(fd, IO_READ, anvil_input, client);
+	o_stream_send_str(client->output, ANVIL_HANDSHAKE);
+	return 0;
+}
+
+static void anvil_client_cancel_queries(struct anvil_client *client)
+{
+	const struct anvil_query *queries, *query;
+	unsigned int count;
+
+	queries = array_get(&client->queries_arr, &count);
+	while (aqueue_count(client->queries) > 0) {
+		query = &queries[aqueue_idx(client->queries, 0)];
+		query->callback(NULL, query->context);
+		aqueue_delete_tail(client->queries);
+	}
+}
+
+static void anvil_client_disconnect(struct anvil_client *client)
+{
+	if (client->fd == -1)
+		return;
+
+	anvil_client_cancel_queries(client);
+	io_remove(&client->io);
+	i_stream_destroy(&client->input);
+	o_stream_destroy(&client->output);
+	net_disconnect(client->fd);
+	client->fd = -1;
+}
+
+void anvil_client_query(struct anvil_client *client, const char *query,
+			anvil_callback_t *callback, void *context)
+{
+	struct const_iovec iov[2];
+	struct anvil_query anvil_query;
+
+	if (client->fd == -1) {
+		if (anvil_client_connect(client, FALSE) < 0) {
+			callback(NULL, context);
+			return;
+		}
+	}
+
+	iov[0].iov_base = query;
+	iov[0].iov_len = strlen(query);
+	iov[1].iov_base = "\n";
+	iov[1].iov_len = 1;
+	o_stream_sendv(client->output, iov, 2);
+
+	anvil_query.callback = callback;
+	anvil_query.context = context;
+	aqueue_append(client->queries, &anvil_query);
+}
diff -r 7bdb5816f797 -r 8ebf82849077 src/lib-master/anvil-client.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/lib-master/anvil-client.h	Fri Nov 06 13:57:04 2009 -0500
@@ -0,0 +1,20 @@
+#ifndef ANVIL_CLIENT_H
+#define ANVIL_CLIENT_H
+
+/* reply=NULL if query failed */
+typedef void anvil_callback_t(const char *reply, void *context);
+
+/* If reconnect_callback is specified, it's called when connection is lost.
+   If the callback returns FALSE, reconnection isn't attempted. */
+struct anvil_client *
+anvil_client_init(const char *path, bool (*reconnect_callback)(void));
+void anvil_client_deinit(struct anvil_client **client);
+
+/* Connect to anvil. If retry=TRUE, try connecting for a while */
+int anvil_client_connect(struct anvil_client *client, bool retry);
+
+/* Send a query to anvil, expect a one line reply. */
+void anvil_client_query(struct anvil_client *client, const char *query,
+			anvil_callback_t *callback, void *context);
+
+#endif