diff options
Diffstat (limited to 'src/core/ext/resolver/zookeeper/zookeeper_resolver.c')
| -rw-r--r-- | src/core/ext/resolver/zookeeper/zookeeper_resolver.c | 513 |
1 files changed, 0 insertions, 513 deletions
diff --git a/src/core/ext/resolver/zookeeper/zookeeper_resolver.c b/src/core/ext/resolver/zookeeper/zookeeper_resolver.c deleted file mode 100644 index deb4b9b1ef..0000000000 --- a/src/core/ext/resolver/zookeeper/zookeeper_resolver.c +++ /dev/null @@ -1,513 +0,0 @@ -/* - * - * 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 <string.h> - -#include <grpc/support/alloc.h> -#include <grpc/support/string_util.h> - -#include <grpc/grpc_zookeeper.h> -#include <zookeeper/zookeeper.h> - -#include "src/core/ext/client_config/lb_policy_registry.h" -#include "src/core/ext/client_config/resolver_registry.h" -#include "src/core/lib/iomgr/resolve_address.h" -#include "src/core/lib/json/json.h" -#include "src/core/lib/support/string.h" -#include "src/core/lib/surface/api_trace.h" - -/** Zookeeper session expiration time in milliseconds */ -#define GRPC_ZOOKEEPER_SESSION_TIMEOUT 15000 - -typedef struct { - /** base class: must be first */ - grpc_resolver base; - /** refcount */ - gpr_refcount refs; - /** name to resolve */ - char *name; - /** subchannel factory */ - grpc_client_channel_factory *client_channel_factory; - /** load balancing policy name */ - char *lb_policy_name; - - /** mutex guarding the rest of the state */ - gpr_mu mu; - /** are we currently resolving? */ - int resolving; - /** which version of resolved_config have we published? */ - int published_version; - /** which version of resolved_config is current? */ - int resolved_version; - /** pending next completion, or NULL */ - grpc_closure *next_completion; - /** target config address for next completion */ - grpc_client_config **target_config; - /** current (fully resolved) config */ - grpc_client_config *resolved_config; - - /** zookeeper handle */ - zhandle_t *zookeeper_handle; - /** zookeeper resolved addresses */ - grpc_resolved_addresses *resolved_addrs; - /** total number of addresses to be resolved */ - int resolved_total; - /** number of addresses resolved */ - int resolved_num; -} zookeeper_resolver; - -static void zookeeper_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *r); - -static void zookeeper_start_resolving_locked(zookeeper_resolver *r); -static void zookeeper_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, - zookeeper_resolver *r); - -static void zookeeper_shutdown(grpc_exec_ctx *exec_ctx, grpc_resolver *r); -static void zookeeper_channel_saw_error(grpc_exec_ctx *exec_ctx, - grpc_resolver *r); -static void zookeeper_next(grpc_exec_ctx *exec_ctx, grpc_resolver *r, - grpc_client_config **target_config, - grpc_closure *on_complete); - -static const grpc_resolver_vtable zookeeper_resolver_vtable = { - zookeeper_destroy, zookeeper_shutdown, zookeeper_channel_saw_error, - zookeeper_next}; - -static void zookeeper_shutdown(grpc_exec_ctx *exec_ctx, - grpc_resolver *resolver) { - zookeeper_resolver *r = (zookeeper_resolver *)resolver; - grpc_closure *call = NULL; - gpr_mu_lock(&r->mu); - if (r->next_completion != NULL) { - *r->target_config = NULL; - call = r->next_completion; - r->next_completion = NULL; - } - zookeeper_close(r->zookeeper_handle); - gpr_mu_unlock(&r->mu); - if (call != NULL) { - call->cb(exec_ctx, call->cb_arg, 1); - } -} - -static void zookeeper_channel_saw_error(grpc_exec_ctx *exec_ctx, - grpc_resolver *resolver) { - zookeeper_resolver *r = (zookeeper_resolver *)resolver; - gpr_mu_lock(&r->mu); - if (r->resolving == 0) { - zookeeper_start_resolving_locked(r); - } - gpr_mu_unlock(&r->mu); -} - -static void zookeeper_next(grpc_exec_ctx *exec_ctx, grpc_resolver *resolver, - grpc_client_config **target_config, - grpc_closure *on_complete) { - zookeeper_resolver *r = (zookeeper_resolver *)resolver; - gpr_mu_lock(&r->mu); - GPR_ASSERT(r->next_completion == NULL); - r->next_completion = on_complete; - r->target_config = target_config; - if (r->resolved_version == 0 && r->resolving == 0) { - zookeeper_start_resolving_locked(r); - } else { - zookeeper_maybe_finish_next_locked(exec_ctx, r); - } - gpr_mu_unlock(&r->mu); -} - -/** Zookeeper global watcher for connection management - TODO: better connection management besides logs */ -static void zookeeper_global_watcher(zhandle_t *zookeeper_handle, int type, - int state, const char *path, - void *watcher_ctx) { - if (type == ZOO_SESSION_EVENT) { - if (state == ZOO_EXPIRED_SESSION_STATE) { - gpr_log(GPR_ERROR, "Zookeeper session expired"); - } else if (state == ZOO_AUTH_FAILED_STATE) { - gpr_log(GPR_ERROR, "Zookeeper authentication failed"); - } - } -} - -/** Zookeeper watcher triggered by changes to watched nodes - Once triggered, it tries to resolve again to get updated addresses */ -static void zookeeper_watcher(zhandle_t *zookeeper_handle, int type, int state, - const char *path, void *watcher_ctx) { - if (watcher_ctx != NULL) { - zookeeper_resolver *r = (zookeeper_resolver *)watcher_ctx; - if (state == ZOO_CONNECTED_STATE) { - gpr_mu_lock(&r->mu); - if (r->resolving == 0) { - zookeeper_start_resolving_locked(r); - } - gpr_mu_unlock(&r->mu); - } - } -} - -/** Callback function after getting all resolved addresses - Creates a subchannel for each address */ -static void zookeeper_on_resolved(grpc_exec_ctx *exec_ctx, void *arg, - grpc_resolved_addresses *addresses) { - zookeeper_resolver *r = arg; - grpc_client_config *config = NULL; - grpc_lb_policy *lb_policy; - - if (addresses != NULL) { - grpc_lb_policy_args lb_policy_args; - config = grpc_client_config_create(); - lb_policy_args.addresses = addresses; - lb_policy_args.client_channel_factory = r->client_channel_factory; - lb_policy = - grpc_lb_policy_create(exec_ctx, r->lb_policy_name, &lb_policy_args); - - if (lb_policy != NULL) { - grpc_client_config_set_lb_policy(config, lb_policy); - GRPC_LB_POLICY_UNREF(exec_ctx, lb_policy, "construction"); - } - grpc_resolved_addresses_destroy(addresses); - } - gpr_mu_lock(&r->mu); - GPR_ASSERT(r->resolving == 1); - r->resolving = 0; - if (r->resolved_config != NULL) { - grpc_client_config_unref(exec_ctx, r->resolved_config); - } - r->resolved_config = config; - r->resolved_version++; - zookeeper_maybe_finish_next_locked(exec_ctx, r); - gpr_mu_unlock(&r->mu); - - GRPC_RESOLVER_UNREF(exec_ctx, &r->base, "zookeeper-resolving"); -} - -/** Callback function for each DNS resolved address */ -static void zookeeper_dns_resolved(grpc_exec_ctx *exec_ctx, void *arg, - grpc_resolved_addresses *addresses) { - size_t i; - zookeeper_resolver *r = arg; - int resolve_done = 0; - - gpr_mu_lock(&r->mu); - r->resolved_num++; - r->resolved_addrs->addrs = - gpr_realloc(r->resolved_addrs->addrs, - sizeof(grpc_resolved_address) * - (r->resolved_addrs->naddrs + addresses->naddrs)); - for (i = 0; i < addresses->naddrs; i++) { - memcpy(r->resolved_addrs->addrs[i + r->resolved_addrs->naddrs].addr, - addresses->addrs[i].addr, addresses->addrs[i].len); - r->resolved_addrs->addrs[i + r->resolved_addrs->naddrs].len = - addresses->addrs[i].len; - } - - r->resolved_addrs->naddrs += addresses->naddrs; - grpc_resolved_addresses_destroy(addresses); - - /** Wait for all addresses to be resolved */ - resolve_done = (r->resolved_num == r->resolved_total); - gpr_mu_unlock(&r->mu); - if (resolve_done) { - zookeeper_on_resolved(exec_ctx, r, r->resolved_addrs); - } -} - -/** Parses JSON format address of a zookeeper node */ -static char *zookeeper_parse_address(const char *value, size_t value_len) { - grpc_json *json; - grpc_json *cur; - const char *host; - const char *port; - char *buffer; - char *address = NULL; - - buffer = gpr_malloc(value_len); - memcpy(buffer, value, value_len); - json = grpc_json_parse_string_with_len(buffer, value_len); - if (json != NULL) { - host = NULL; - port = NULL; - for (cur = json->child; cur != NULL; cur = cur->next) { - if (!strcmp(cur->key, "host")) { - host = cur->value; - if (port != NULL) { - break; - } - } else if (!strcmp(cur->key, "port")) { - port = cur->value; - if (host != NULL) { - break; - } - } - } - if (host != NULL && port != NULL) { - gpr_asprintf(&address, "%s:%s", host, port); - } - grpc_json_destroy(json); - } - gpr_free(buffer); - - return address; -} - -static void zookeeper_get_children_node_completion(int rc, const char *value, - int value_len, - const struct Stat *stat, - const void *arg) { - char *address = NULL; - zookeeper_resolver *r = (zookeeper_resolver *)arg; - int resolve_done = 0; - grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; - - if (rc != 0) { - gpr_log(GPR_ERROR, "Error in getting a child node of %s", r->name); - grpc_exec_ctx_finish(&exec_ctx); - return; - } - - address = zookeeper_parse_address(value, (size_t)value_len); - if (address != NULL) { - /** Further resolves address by DNS */ - grpc_resolve_address(&exec_ctx, address, NULL, zookeeper_dns_resolved, r); - gpr_free(address); - } else { - gpr_log(GPR_ERROR, "Error in resolving a child node of %s", r->name); - gpr_mu_lock(&r->mu); - r->resolved_total--; - resolve_done = (r->resolved_num == r->resolved_total); - gpr_mu_unlock(&r->mu); - if (resolve_done) { - zookeeper_on_resolved(&exec_ctx, r, r->resolved_addrs); - } - } - - grpc_exec_ctx_finish(&exec_ctx); -} - -static void zookeeper_get_children_completion( - int rc, const struct String_vector *children, const void *arg) { - char *path; - int status; - int i; - zookeeper_resolver *r = (zookeeper_resolver *)arg; - - if (rc != 0) { - gpr_log(GPR_ERROR, "Error in getting zookeeper children of %s", r->name); - return; - } - - if (children->count == 0) { - gpr_log(GPR_ERROR, "Error in resolving zookeeper address %s", r->name); - return; - } - - r->resolved_addrs = gpr_malloc(sizeof(grpc_resolved_addresses)); - r->resolved_addrs->addrs = NULL; - r->resolved_addrs->naddrs = 0; - r->resolved_total = children->count; - - /** TODO: Replace expensive heap allocation with stack - if we can get maximum length of zookeeper path */ - for (i = 0; i < children->count; i++) { - gpr_asprintf(&path, "%s/%s", r->name, children->data[i]); - status = zoo_awget(r->zookeeper_handle, path, zookeeper_watcher, r, - zookeeper_get_children_node_completion, r); - gpr_free(path); - if (status != 0) { - gpr_log(GPR_ERROR, "Error in getting zookeeper node %s", path); - } - } -} - -static void zookeeper_get_node_completion(int rc, const char *value, - int value_len, - const struct Stat *stat, - const void *arg) { - int status; - char *address = NULL; - zookeeper_resolver *r = (zookeeper_resolver *)arg; - r->resolved_addrs = NULL; - r->resolved_total = 0; - r->resolved_num = 0; - - if (rc != 0) { - gpr_log(GPR_ERROR, "Error in getting zookeeper node %s", r->name); - return; - } - - /** If zookeeper node of path r->name does not have address - (i.e. service node), get its children */ - address = zookeeper_parse_address(value, (size_t)value_len); - if (address != NULL) { - r->resolved_addrs = gpr_malloc(sizeof(grpc_resolved_addresses)); - r->resolved_addrs->addrs = NULL; - r->resolved_addrs->naddrs = 0; - r->resolved_total = 1; - /** Further resolves address by DNS */ - grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; - grpc_resolve_address(&exec_ctx, address, NULL, zookeeper_dns_resolved, r); - gpr_free(address); - grpc_exec_ctx_finish(&exec_ctx); - return; - } - - status = zoo_awget_children(r->zookeeper_handle, r->name, zookeeper_watcher, - r, zookeeper_get_children_completion, r); - if (status != 0) { - gpr_log(GPR_ERROR, "Error in getting zookeeper children of %s", r->name); - } -} - -static void zookeeper_resolve_address(zookeeper_resolver *r) { - int status; - status = zoo_awget(r->zookeeper_handle, r->name, zookeeper_watcher, r, - zookeeper_get_node_completion, r); - if (status != 0) { - gpr_log(GPR_ERROR, "Error in getting zookeeper node %s", r->name); - } -} - -static void zookeeper_start_resolving_locked(zookeeper_resolver *r) { - GRPC_RESOLVER_REF(&r->base, "zookeeper-resolving"); - GPR_ASSERT(r->resolving == 0); - r->resolving = 1; - zookeeper_resolve_address(r); -} - -static void zookeeper_maybe_finish_next_locked(grpc_exec_ctx *exec_ctx, - zookeeper_resolver *r) { - if (r->next_completion != NULL && - r->resolved_version != r->published_version) { - *r->target_config = r->resolved_config; - if (r->resolved_config != NULL) { - grpc_client_config_ref(r->resolved_config); - } - grpc_exec_ctx_enqueue(exec_ctx, r->next_completion, true, NULL); - r->next_completion = NULL; - r->published_version = r->resolved_version; - } -} - -static void zookeeper_destroy(grpc_exec_ctx *exec_ctx, grpc_resolver *gr) { - zookeeper_resolver *r = (zookeeper_resolver *)gr; - gpr_mu_destroy(&r->mu); - if (r->resolved_config != NULL) { - grpc_client_config_unref(exec_ctx, r->resolved_config); - } - grpc_client_channel_factory_unref(exec_ctx, r->client_channel_factory); - gpr_free(r->name); - gpr_free(r->lb_policy_name); - gpr_free(r); -} - -static grpc_resolver *zookeeper_create(grpc_resolver_args *args, - const char *lb_policy_name) { - zookeeper_resolver *r; - size_t length; - char *path = args->uri->path; - - if (0 == strcmp(args->uri->authority, "")) { - gpr_log(GPR_ERROR, "No authority specified in zookeeper uri"); - return NULL; - } - - /** Removes the trailing slash if exists */ - length = strlen(path); - if (length > 1 && path[length - 1] == '/') { - path[length - 1] = 0; - } - - r = gpr_malloc(sizeof(zookeeper_resolver)); - memset(r, 0, sizeof(*r)); - gpr_ref_init(&r->refs, 1); - gpr_mu_init(&r->mu); - grpc_resolver_init(&r->base, &zookeeper_resolver_vtable); - r->name = gpr_strdup(path); - - r->client_channel_factory = args->client_channel_factory; - grpc_client_channel_factory_ref(r->client_channel_factory); - - r->lb_policy_name = gpr_strdup(lb_policy_name); - - /** Initializes zookeeper client */ - zoo_set_debug_level(ZOO_LOG_LEVEL_WARN); - r->zookeeper_handle = - zookeeper_init(args->uri->authority, zookeeper_global_watcher, - GRPC_ZOOKEEPER_SESSION_TIMEOUT, 0, 0, 0); - if (r->zookeeper_handle == NULL) { - gpr_log(GPR_ERROR, "Unable to connect to zookeeper server"); - return NULL; - } - - return &r->base; -} - -/* - * FACTORY - */ - -static void zookeeper_factory_ref(grpc_resolver_factory *factory) {} - -static void zookeeper_factory_unref(grpc_resolver_factory *factory) {} - -static char *zookeeper_factory_get_default_hostname( - grpc_resolver_factory *factory, grpc_uri *uri) { - return NULL; -} - -static grpc_resolver *zookeeper_factory_create_resolver( - grpc_resolver_factory *factory, grpc_resolver_args *args) { - return zookeeper_create(args, "pick_first"); -} - -static const grpc_resolver_factory_vtable zookeeper_factory_vtable = { - zookeeper_factory_ref, zookeeper_factory_unref, - zookeeper_factory_create_resolver, zookeeper_factory_get_default_hostname, - "zookeeper"}; - -static grpc_resolver_factory zookeeper_resolver_factory = { - &zookeeper_factory_vtable}; - -static grpc_resolver_factory *zookeeper_resolver_factory_create() { - return &zookeeper_resolver_factory; -} - -static void zookeeper_plugin_init() { - grpc_register_resolver_type(zookeeper_resolver_factory_create()); -} - -void grpc_zookeeper_register() { - GRPC_API_TRACE("grpc_zookeeper_register(void)", 0, ()); - grpc_register_plugin(zookeeper_plugin_init, NULL); -} |