Unix resolver, bug fixes
diff --git a/src/core/client_config/resolvers/unix_resolver_posix.c b/src/core/client_config/resolvers/unix_resolver_posix.c
new file mode 100644
index 0000000..3dedf94
--- /dev/null
+++ b/src/core/client_config/resolvers/unix_resolver_posix.c
@@ -0,0 +1,209 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+#ifdef GPR_POSIX_SOCKET
+
+#include "src/core/client_config/resolvers/unix_resolver_posix.h"
+
+#include <string.h>
+#include <sys/un.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/string_util.h>
+
+#include "src/core/client_config/lb_policies/pick_first.h"
+#include "src/core/iomgr/resolve_address.h"
+#include "src/core/support/string.h"
+
+typedef struct {
+ /** base class: must be first */
+ grpc_resolver base;
+ /** refcount */
+ gpr_refcount refs;
+ /** subchannel factory */
+ grpc_subchannel_factory *subchannel_factory;
+ /** load balancing policy factory */
+ grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels,
+ size_t num_subchannels);
+
+ /** the address that we've 'resolved' */
+ struct sockaddr_un addr;
+ int addr_len;
+
+ /** mutex guarding the rest of the state */
+ gpr_mu mu;
+ /** have we published? */
+ int published;
+ /** pending next completion, or NULL */
+ grpc_iomgr_closure *next_completion;
+ /** target config address for next completion */
+ grpc_client_config **target_config;
+} unix_resolver;
+
+static void unix_destroy(unix_resolver *r);
+
+static void unix_maybe_finish_next_locked(unix_resolver *r);
+
+static void unix_ref(grpc_resolver *r);
+static void unix_unref(grpc_resolver *r);
+static void unix_shutdown(grpc_resolver *r);
+static void unix_channel_saw_error(grpc_resolver *r,
+ struct sockaddr *failing_address,
+ int failing_address_len);
+static void unix_next(grpc_resolver *r, grpc_client_config **target_config,
+ grpc_iomgr_closure *on_complete);
+
+static const grpc_resolver_vtable unix_resolver_vtable = {
+ unix_ref, unix_unref, unix_shutdown, unix_channel_saw_error, unix_next};
+
+static void unix_ref(grpc_resolver *resolver) {
+ unix_resolver *r = (unix_resolver *)resolver;
+ gpr_ref(&r->refs);
+}
+
+static void unix_unref(grpc_resolver *resolver) {
+ unix_resolver *r = (unix_resolver *)resolver;
+ if (gpr_unref(&r->refs)) {
+ unix_destroy(r);
+ }
+}
+
+static void unix_shutdown(grpc_resolver *resolver) {
+ unix_resolver *r = (unix_resolver *)resolver;
+ gpr_mu_lock(&r->mu);
+ if (r->next_completion != NULL) {
+ *r->target_config = NULL;
+ /* TODO(ctiller): add delayed callback */
+ grpc_iomgr_add_callback(r->next_completion);
+ r->next_completion = NULL;
+ }
+ gpr_mu_unlock(&r->mu);
+}
+
+static void unix_channel_saw_error(grpc_resolver *resolver, struct sockaddr *sa,
+ int len) {
+}
+
+static void unix_next(grpc_resolver *resolver,
+ grpc_client_config **target_config,
+ grpc_iomgr_closure *on_complete) {
+ unix_resolver *r = (unix_resolver *)resolver;
+ gpr_mu_lock(&r->mu);
+ GPR_ASSERT(!r->next_completion);
+ r->next_completion = on_complete;
+ r->target_config = target_config;
+ unix_maybe_finish_next_locked(r);
+ gpr_mu_unlock(&r->mu);
+}
+
+static void unix_maybe_finish_next_locked(unix_resolver *r) {
+ grpc_client_config *cfg;
+ grpc_lb_policy *lb_policy;
+ grpc_subchannel *subchannel;
+ grpc_subchannel_args args;
+
+ if (r->next_completion != NULL && !r->published) {
+ cfg = grpc_client_config_create();
+ memset(&args, 0, sizeof(args));
+ args.addr = (struct sockaddr *) &r->addr;
+ args.addr_len = r->addr_len;
+ subchannel = grpc_subchannel_factory_create_subchannel(r->subchannel_factory, &args);
+ lb_policy = r->lb_policy_factory(&subchannel, 1);
+ grpc_client_config_set_lb_policy(cfg, lb_policy);
+ GRPC_LB_POLICY_UNREF(lb_policy, "unix");
+ r->published = 1;
+ *r->target_config = cfg;
+ grpc_iomgr_add_callback(r->next_completion);
+ r->next_completion = NULL;
+ }
+}
+
+static void unix_destroy(unix_resolver *r) {
+ gpr_mu_destroy(&r->mu);
+ grpc_subchannel_factory_unref(r->subchannel_factory);
+ gpr_free(r);
+}
+
+static grpc_resolver *unix_create(
+ grpc_uri *uri,
+ grpc_lb_policy *(*lb_policy_factory)(grpc_subchannel **subchannels,
+ size_t num_subchannels),
+ grpc_subchannel_factory *subchannel_factory) {
+ unix_resolver *r;
+
+ if (0 != strcmp(uri->authority, "")) {
+ gpr_log(GPR_ERROR, "authority based uri's not supported");
+ return NULL;
+ }
+
+ r = gpr_malloc(sizeof(unix_resolver));
+ memset(r, 0, sizeof(*r));
+ gpr_ref_init(&r->refs, 1);
+ gpr_mu_init(&r->mu);
+ r->base.vtable = &unix_resolver_vtable;
+ r->subchannel_factory = subchannel_factory;
+ r->lb_policy_factory = lb_policy_factory;
+
+ r->addr.sun_family = AF_UNIX;
+ strcpy(r->addr.sun_path, uri->path);
+ r->addr_len = strlen(r->addr.sun_path) + sizeof(r->addr.sun_family) + 1;
+
+ grpc_subchannel_factory_ref(subchannel_factory);
+ return &r->base;
+}
+
+/*
+ * FACTORY
+ */
+
+static void unix_factory_ref(grpc_resolver_factory *factory) {}
+
+static void unix_factory_unref(grpc_resolver_factory *factory) {}
+
+static grpc_resolver *unix_factory_create_resolver(
+ grpc_resolver_factory *factory, grpc_uri *uri,
+ grpc_subchannel_factory *subchannel_factory) {
+ return unix_create(uri, grpc_create_pick_first_lb_policy,
+ subchannel_factory);
+}
+
+static const grpc_resolver_factory_vtable unix_factory_vtable = {
+ unix_factory_ref, unix_factory_unref, unix_factory_create_resolver};
+static grpc_resolver_factory unix_resolver_factory = {&unix_factory_vtable};
+
+grpc_resolver_factory *grpc_unix_resolver_factory_create() {
+ return &unix_resolver_factory;
+}
+
+#endif
diff --git a/src/core/client_config/resolvers/unix_resolver_posix.h b/src/core/client_config/resolvers/unix_resolver_posix.h
new file mode 100644
index 0000000..a84906f
--- /dev/null
+++ b/src/core/client_config/resolvers/unix_resolver_posix.h
@@ -0,0 +1,44 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_UNIX_RESOLVER_H
+#define GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_UNIX_RESOLVER_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/client_config/resolver_factory.h"
+
+/** Create a dns resolver for \a name */
+grpc_resolver_factory *grpc_unix_resolver_factory_create(void);
+
+#endif /* GRPC_INTERNAL_CORE_CLIENT_CONFIG_RESOLVERS_UNIX_RESOLVER_H */