Initial checkin of gRPC to third_party/

third_party/grpc/src/core/client_config/resolvers/sockaddr_resolver.c

Index: third_party/grpc/src/core/client_config/resolvers/sockaddr_resolver.c
diff --git a/third_party/grpc/src/core/client_config/resolvers/sockaddr_resolver.c b/third_party/grpc/src/core/client_config/resolvers/sockaddr_resolver.c
new file mode 100644
index 0000000000000000000000000000000000000000..68910ad975b6ab5b93d7bd7444b07dd646fd55b9
--- /dev/null
+++ b/third_party/grpc/src/core/client_config/resolvers/sockaddr_resolver.c
@@ -0,0 +1,391 @@
+/*
+ *
+ * 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>
+#ifdef GPR_POSIX_SOCKET
+#include <sys/un.h>
+#endif
+
+#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/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);
+}
+
+#ifdef GPR_POSIX_SOCKET
+static int parse_unix(grpc_uri *uri, struct sockaddr_storage *addr,
+                      size_t *len) {
+  struct sockaddr_un *un = (struct sockaddr_un *)addr;
+
+  un->sun_family = AF_UNIX;
+  strcpy(un->sun_path, uri->path);
+  *len = strlen(un->sun_path) + sizeof(un->sun_family) + 1;
+
+  return 1;
+}
+
+static char *unix_get_default_authority(grpc_resolver_factory *factory,
+                                        grpc_uri *uri) {
+  return gpr_strdup("localhost");
+}
+#endif
+
+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)                                                  \
+  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};                                              \
+  grpc_resolver_factory *grpc_##name##_resolver_factory_create() {          \
+    return &name##_resolver_factory;                                        \
+  }
+
+#ifdef GPR_POSIX_SOCKET
+DECL_FACTORY(unix)
+#endif
+DECL_FACTORY(ipv4) DECL_FACTORY(ipv6)