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/*
*
* 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 <grpc/support/port_platform.h>
#include "src/core/client_config/resolvers/sockaddr_resolver.h"
#include <stdio.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/host_port.h>
#include <grpc/support/string_util.h>
#include "src/core/client_config/lb_policy_registry.h"
#include "src/core/iomgr/resolve_address.h"
#include "src/core/iomgr/unix_sockets_posix.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 name */
char *lb_policy_name;
/** the addresses that we've 'resolved' */
struct sockaddr_storage *addrs;
/** the corresponding length of the addresses */
size_t *addrs_len;
/** how many elements in \a addrs */
size_t num_addrs;
/** 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) {
grpc_client_config *cfg;
grpc_lb_policy *lb_policy;
grpc_lb_policy_args lb_policy_args;
grpc_subchannel **subchannels;
grpc_subchannel_args args;
if (r->next_completion != NULL && !r->published) {
size_t i;
cfg = grpc_client_config_create();
subchannels = gpr_malloc(sizeof(grpc_subchannel *) * r->num_addrs);
for (i = 0; i < r->num_addrs; i++) {
memset(&args, 0, sizeof(args));
args.addr = (struct sockaddr *)&r->addrs[i];
args.addr_len = r->addrs_len[i];
subchannels[i] = grpc_subchannel_factory_create_subchannel(
exec_ctx, r->subchannel_factory, &args);
}
memset(&lb_policy_args, 0, sizeof(lb_policy_args));
lb_policy_args.subchannels = subchannels;
lb_policy_args.num_subchannels = r->num_addrs;
lb_policy = grpc_lb_policy_create(r->lb_policy_name, &lb_policy_args);
gpr_free(subchannels);
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);
gpr_free(r->addrs);
gpr_free(r->addrs_len);
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)) {
size_t i;
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 = NULL;
if (0 != strcmp(args->uri->query, "")) {
gpr_slice query_slice;
gpr_slice_buffer query_parts;
query_slice =
gpr_slice_new(args->uri->query, strlen(args->uri->query), do_nothing);
gpr_slice_buffer_init(&query_parts);
gpr_slice_split(query_slice, "=", &query_parts);
GPR_ASSERT(query_parts.count == 2);
if (0 == gpr_slice_str_cmp(query_parts.slices[0], "lb_policy")) {
r->lb_policy_name = gpr_dump_slice(query_parts.slices[1], GPR_DUMP_ASCII);
}
gpr_slice_buffer_destroy(&query_parts);
gpr_slice_unref(query_slice);
}
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->num_addrs = path_parts.count;
r->addrs = gpr_malloc(sizeof(struct sockaddr_storage) * r->num_addrs);
r->addrs_len = gpr_malloc(sizeof(*r->addrs_len) * r->num_addrs);
for (i = 0; i < r->num_addrs; 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, &r->addrs[i], &r->addrs_len[i])) {
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);
gpr_free(r->addrs);
gpr_free(r->addrs_len);
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}; \
grpc_resolver_factory *grpc_##name##_resolver_factory_create() { \
return &name##_resolver_factory; \
}
#ifdef GPR_HAVE_UNIX_SOCKET
DECL_FACTORY(unix, grpc_)
#endif
DECL_FACTORY(ipv4, ) DECL_FACTORY(ipv6, )
|