| /* |
| * |
| * 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 |