diff options
Diffstat (limited to 'src/core/ext/resolver/sockaddr/sockaddr_resolver.c')
| -rw-r--r-- | src/core/ext/resolver/sockaddr/sockaddr_resolver.c | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/src/core/ext/resolver/sockaddr/sockaddr_resolver.c b/src/core/ext/resolver/sockaddr/sockaddr_resolver.c new file mode 100644 index 0000000000..fed9d20392 --- /dev/null +++ b/src/core/ext/resolver/sockaddr/sockaddr_resolver.c @@ -0,0 +1,363 @@ +/* + * + * 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 <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/lib/client_config/lb_policy_registry.h" +#include "src/core/lib/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_subchannel_factory *subchannel_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_enqueue(exec_ctx, r->next_completion, true, 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.subchannel_factory = r->subchannel_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_enqueue(exec_ctx, r->next_completion, true, 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_subchannel_factory_unref(exec_ctx, r->subchannel_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); +} + +static int parse_ipv4(grpc_uri *uri, struct sockaddr_storage *addr, + size_t *len) { + const char *host_port = uri->path; + char *host; + char *port; + int port_num; + int result = 0; + struct sockaddr_in *in = (struct sockaddr_in *)addr; + + if (*host_port == '/') ++host_port; + if (!gpr_split_host_port(host_port, &host, &port)) { + return 0; + } + + memset(in, 0, sizeof(*in)); + *len = sizeof(*in); + in->sin_family = AF_INET; + if (inet_pton(AF_INET, host, &in->sin_addr) == 0) { + gpr_log(GPR_ERROR, "invalid ipv4 address: '%s'", host); + goto done; + } + + if (port != NULL) { + if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 || + port_num > 65535) { + gpr_log(GPR_ERROR, "invalid ipv4 port: '%s'", port); + goto done; + } + in->sin_port = htons((uint16_t)port_num); + } else { + gpr_log(GPR_ERROR, "no port given for ipv4 scheme"); + goto done; + } + + result = 1; +done: + gpr_free(host); + gpr_free(port); + return result; +} + +static int parse_ipv6(grpc_uri *uri, struct sockaddr_storage *addr, + size_t *len) { + const char *host_port = uri->path; + char *host; + char *port; + int port_num; + int result = 0; + struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr; + + if (*host_port == '/') ++host_port; + if (!gpr_split_host_port(host_port, &host, &port)) { + return 0; + } + + memset(in6, 0, sizeof(*in6)); + *len = sizeof(*in6); + in6->sin6_family = AF_INET6; + if (inet_pton(AF_INET6, host, &in6->sin6_addr) == 0) { + gpr_log(GPR_ERROR, "invalid ipv6 address: '%s'", host); + goto done; + } + + if (port != NULL) { + if (sscanf(port, "%d", &port_num) != 1 || port_num < 0 || + port_num > 65535) { + gpr_log(GPR_ERROR, "invalid ipv6 port: '%s'", port); + goto done; + } + in6->sin6_port = htons((uint16_t)port_num); + } else { + gpr_log(GPR_ERROR, "no port given for ipv6 scheme"); + goto done; + } + + result = 1; +done: + gpr_free(host); + gpr_free(port); + return result; +} + +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->subchannel_factory = args->subchannel_factory; + grpc_subchannel_factory_ref(r->subchannel_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, prefix) \ + static grpc_resolver *name##_factory_create_resolver( \ + grpc_resolver_factory *factory, grpc_resolver_args *args) { \ + return sockaddr_create(args, "pick_first", prefix##parse_##name); \ + } \ + static const grpc_resolver_factory_vtable name##_factory_vtable = { \ + sockaddr_factory_ref, sockaddr_factory_unref, \ + name##_factory_create_resolver, prefix##name##_get_default_authority, \ + #name}; \ + static grpc_resolver_factory name##_resolver_factory = { \ + &name##_factory_vtable} + +#ifdef GPR_HAVE_UNIX_SOCKET +DECL_FACTORY(unix, grpc_); +#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) {} |