| /* |
| * |
| * Copyright 2015-2016, 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 <stdbool.h> |
| #include <stdio.h> |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/host_port.h> |
| #include <grpc/support/port_platform.h> |
| #include <grpc/support/string_util.h> |
| |
| #include "src/core/ext/client_config/lb_policy_registry.h" |
| #include "src/core/ext/client_config/parse_address.h" |
| #include "src/core/ext/client_config/resolver_registry.h" |
| #include "src/core/lib/iomgr/resolve_address.h" |
| #include "src/core/lib/iomgr/unix_sockets_posix.h" |
| #include "src/core/lib/support/string.h" |
| |
| typedef struct { |
| /** base class: must be first */ |
| grpc_resolver base; |
| /** refcount */ |
| gpr_refcount refs; |
| /** subchannel factory */ |
| grpc_client_channel_factory *client_channel_factory; |
| /** load balancing policy name */ |
| char *lb_policy_name; |
| |
| /** the addresses that we've 'resolved' */ |
| grpc_resolved_addresses *addresses; |
| |
| /** mutex guarding the rest of the state */ |
| gpr_mu mu; |
| /** have we published? */ |
| int published; |
| /** pending next completion, or NULL */ |
| grpc_closure *next_completion; |
| /** target config address for next completion */ |
| grpc_client_config **target_config; |
| } sockaddr_resolver; |
| |
| static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *r); |
| |
| static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, |
| sockaddr_resolver *r); |
| |
| static void sockaddr_shutdown(grpc_exec_ctx *exec_ctx, grpc_resolver *r); |
| static void sockaddr_channel_saw_error(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *r); |
| static void sockaddr_next(grpc_exec_ctx *exec_ctx, grpc_resolver *r, |
| grpc_client_config **target_config, |
| grpc_closure *on_complete); |
| |
| static const grpc_resolver_vtable sockaddr_resolver_vtable = { |
| sockaddr_destroy, sockaddr_shutdown, sockaddr_channel_saw_error, |
| sockaddr_next}; |
| |
| static void sockaddr_shutdown(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| gpr_mu_lock(&r->mu); |
| if (r->next_completion != NULL) { |
| *r->target_config = NULL; |
| grpc_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL); |
| r->next_completion = NULL; |
| } |
| gpr_mu_unlock(&r->mu); |
| } |
| |
| static void sockaddr_channel_saw_error(grpc_exec_ctx *exec_ctx, |
| grpc_resolver *resolver) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| gpr_mu_lock(&r->mu); |
| r->published = 0; |
| sockaddr_maybe_finish_next_locked(exec_ctx, r); |
| gpr_mu_unlock(&r->mu); |
| } |
| |
| static void sockaddr_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, |
| grpc_client_config **target_config, |
| grpc_closure *on_complete) { |
| sockaddr_resolver *r = (sockaddr_resolver *)resolver; |
| gpr_mu_lock(&r->mu); |
| GPR_ASSERT(!r->next_completion); |
| r->next_completion = on_complete; |
| r->target_config = target_config; |
| sockaddr_maybe_finish_next_locked(exec_ctx, r); |
| gpr_mu_unlock(&r->mu); |
| } |
| |
| static void sockaddr_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, |
| sockaddr_resolver *r) { |
| if (r->next_completion != NULL && !r->published) { |
| grpc_client_config *cfg = grpc_client_config_create(); |
| grpc_lb_policy_args lb_policy_args; |
| memset(&lb_policy_args, 0, sizeof(lb_policy_args)); |
| lb_policy_args.addresses = r->addresses; |
| lb_policy_args.client_channel_factory = r->client_channel_factory; |
| grpc_lb_policy *lb_policy = |
| grpc_lb_policy_create(exec_ctx, r->lb_policy_name, &lb_policy_args); |
| grpc_client_config_set_lb_policy(cfg, lb_policy); |
| GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "sockaddr"); |
| r->published = 1; |
| *r->target_config = cfg; |
| grpc_exec_ctx_sched(exec_ctx, r->next_completion, GRPC_ERROR_NONE, NULL); |
| r->next_completion = NULL; |
| } |
| } |
| |
| static void sockaddr_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) { |
| sockaddr_resolver *r = (sockaddr_resolver *)gr; |
| gpr_mu_destroy(&r->mu); |
| grpc_client_channel_factory_unref(exec_ctx, r->client_channel_factory); |
| grpc_resolved_addresses_destroy(r->addresses); |
| gpr_free(r->lb_policy_name); |
| gpr_free(r); |
| } |
| |
| static char *ip_get_default_authority(grpc_uri *uri) { |
| const char *path = uri->path; |
| if (path[0] == '/') ++path; |
| return gpr_strdup(path); |
| } |
| |
| static char *ipv4_get_default_authority(grpc_resolver_factory *factory, |
| grpc_uri *uri) { |
| return ip_get_default_authority(uri); |
| } |
| |
| static char *ipv6_get_default_authority(grpc_resolver_factory *factory, |
| grpc_uri *uri) { |
| return ip_get_default_authority(uri); |
| } |
| |
| #ifdef GPR_HAVE_UNIX_SOCKET |
| char *unix_get_default_authority(grpc_resolver_factory *factory, |
| grpc_uri *uri) { |
| return gpr_strdup("localhost"); |
| } |
| #endif |
| |
| static void do_nothing(void *ignored) {} |
| |
| static grpc_resolver *sockaddr_create( |
| grpc_resolver_args *args, const char *default_lb_policy_name, |
| int parse(grpc_uri *uri, struct sockaddr_storage *dst, size_t *len)) { |
| int errors_found = 0; /* GPR_FALSE */ |
| sockaddr_resolver *r; |
| gpr_slice path_slice; |
| gpr_slice_buffer path_parts; |
| |
| if (0 != strcmp(args->uri->authority, "")) { |
| gpr_log(GPR_ERROR, "authority based uri's not supported by the %s scheme", |
| args->uri->scheme); |
| return NULL; |
| } |
| |
| r = gpr_malloc(sizeof(sockaddr_resolver)); |
| memset(r, 0, sizeof(*r)); |
| |
| r->lb_policy_name = |
| gpr_strdup(grpc_uri_get_query_arg(args->uri, "lb_policy")); |
| const char *lb_enabled_qpart = |
| grpc_uri_get_query_arg(args->uri, "lb_enabled"); |
| /* anything other than "0" is interpreted as true */ |
| const bool lb_enabled = |
| (lb_enabled_qpart != NULL && (strcmp("0", lb_enabled_qpart) != 0)); |
| |
| if (r->lb_policy_name != NULL && strcmp("grpclb", r->lb_policy_name) == 0 && |
| !lb_enabled) { |
| /* we want grpclb but the "resolved" addresses aren't LB enabled. Bail |
| * out, as this is meant mostly for tests. */ |
| gpr_log(GPR_ERROR, |
| "Requested 'grpclb' LB policy but resolved addresses don't " |
| "support load balancing."); |
| abort(); |
| } |
| |
| if (r->lb_policy_name == NULL) { |
| r->lb_policy_name = gpr_strdup(default_lb_policy_name); |
| } |
| |
| path_slice = |
| gpr_slice_new(args->uri->path, strlen(args->uri->path), do_nothing); |
| gpr_slice_buffer_init(&path_parts); |
| |
| gpr_slice_split(path_slice, ",", &path_parts); |
| r->addresses = gpr_malloc(sizeof(grpc_resolved_addresses)); |
| r->addresses->naddrs = path_parts.count; |
| r->addresses->addrs = |
| gpr_malloc(sizeof(grpc_resolved_address) * r->addresses->naddrs); |
| |
| for (size_t i = 0; i < r->addresses->naddrs; i++) { |
| grpc_uri ith_uri = *args->uri; |
| char *part_str = gpr_dump_slice(path_parts.slices[i], GPR_DUMP_ASCII); |
| ith_uri.path = part_str; |
| if (!parse(&ith_uri, |
| (struct sockaddr_storage *)(&r->addresses->addrs[i].addr), |
| &r->addresses->addrs[i].len)) { |
| errors_found = 1; /* GPR_TRUE */ |
| } |
| gpr_free(part_str); |
| if (errors_found) break; |
| } |
| |
| gpr_slice_buffer_destroy(&path_parts); |
| gpr_slice_unref(path_slice); |
| if (errors_found) { |
| gpr_free(r->lb_policy_name); |
| grpc_resolved_addresses_destroy(r->addresses); |
| gpr_free(r); |
| return NULL; |
| } |
| |
| gpr_ref_init(&r->refs, 1); |
| gpr_mu_init(&r->mu); |
| grpc_resolver_init(&r->base, &sockaddr_resolver_vtable); |
| r->client_channel_factory = args->client_channel_factory; |
| grpc_client_channel_factory_ref(r->client_channel_factory); |
| |
| return &r->base; |
| } |
| |
| /* |
| * FACTORY |
| */ |
| |
| static void sockaddr_factory_ref(grpc_resolver_factory *factory) {} |
| |
| static void sockaddr_factory_unref(grpc_resolver_factory *factory) {} |
| |
| #define DECL_FACTORY(name) \ |
| static grpc_resolver *name##_factory_create_resolver( \ |
| grpc_resolver_factory *factory, grpc_resolver_args *args) { \ |
| return sockaddr_create(args, "pick_first", parse_##name); \ |
| } \ |
| static const grpc_resolver_factory_vtable name##_factory_vtable = { \ |
| sockaddr_factory_ref, sockaddr_factory_unref, \ |
| name##_factory_create_resolver, name##_get_default_authority, #name}; \ |
| static grpc_resolver_factory name##_resolver_factory = { \ |
| &name##_factory_vtable} |
| |
| #ifdef GPR_HAVE_UNIX_SOCKET |
| DECL_FACTORY(unix); |
| #endif |
| DECL_FACTORY(ipv4); |
| DECL_FACTORY(ipv6); |
| |
| void grpc_resolver_sockaddr_init(void) { |
| grpc_register_resolver_type(&ipv4_resolver_factory); |
| grpc_register_resolver_type(&ipv6_resolver_factory); |
| #ifdef GPR_HAVE_UNIX_SOCKET |
| grpc_register_resolver_type(&unix_resolver_factory); |
| #endif |
| } |
| |
| void grpc_resolver_sockaddr_shutdown(void) {} |