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//
// 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 "src/core/lib/transport/service_config.h"
#include <string.h>
#include <grpc/impl/codegen/grpc_types.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/json/json.h"
#include "src/core/lib/support/string.h"
#include "src/core/lib/transport/mdstr_hash_table.h"
struct grpc_service_config {
char* string;
grpc_json* json;
};
grpc_service_config* grpc_service_config_create(const char* json_string) {
grpc_service_config* service_config = gpr_malloc(sizeof(*service_config));
service_config->string = gpr_strdup(json_string);
service_config->json = grpc_json_parse_string(service_config->string);
return service_config;
}
void grpc_service_config_destroy(grpc_service_config* service_config) {
grpc_json_destroy(service_config->json);
gpr_free(service_config->string);
gpr_free(service_config);
}
const char* grpc_service_config_get_lb_policy_name(
const grpc_service_config* service_config) {
const grpc_json* json = service_config->json;
if (json->type != GRPC_JSON_OBJECT || json->key != NULL) return NULL;
const char* lb_policy_name = NULL;
for (grpc_json* field = json->child; field != NULL; field = field->next) {
if (field->key == NULL) return NULL;
if (strcmp(field->key, "lb_policy_name") == 0) {
if (lb_policy_name != NULL) return NULL; // Duplicate.
if (field->type != GRPC_JSON_STRING) return NULL;
lb_policy_name = field->value;
}
}
return lb_policy_name;
}
// Returns the number of names specified in the method config \a json.
static size_t count_names_in_method_config_json(grpc_json* json) {
size_t num_names = 0;
for (grpc_json* field = json->child; field != NULL; field = field->next) {
if (field->key != NULL && strcmp(field->key, "name") == 0) ++num_names;
}
return num_names;
}
// Returns a path string for the name specified by \a json.
// Returns NULL on error. Caller takes ownership of result.
static char* parse_json_method_name(grpc_json* json) {
if (json->type != GRPC_JSON_OBJECT) return NULL;
const char* service_name = NULL;
const char* method_name = NULL;
for (grpc_json* child = json->child; child != NULL; child = child->next) {
if (child->key == NULL) return NULL;
if (child->type != GRPC_JSON_STRING) return NULL;
if (strcmp(child->key, "service") == 0) {
if (service_name != NULL) return NULL; // Duplicate.
if (child->value == NULL) return NULL;
service_name = child->value;
} else if (strcmp(child->key, "method") == 0) {
if (method_name != NULL) return NULL; // Duplicate.
if (child->value == NULL) return NULL;
method_name = child->value;
}
}
if (service_name == NULL) return NULL; // Required field.
char* path;
gpr_asprintf(&path, "/%s/%s", service_name,
method_name == NULL ? "*" : method_name);
return path;
}
// Parses the method config from \a json. Adds an entry to \a entries for
// each name found, incrementing \a idx for each entry added.
static bool parse_json_method_config(
grpc_json* json, void* (*create_value)(const grpc_json* method_config_json),
const grpc_mdstr_hash_table_vtable* vtable,
grpc_mdstr_hash_table_entry* entries, size_t* idx) {
// Construct value.
void* method_config = create_value(json);
if (method_config == NULL) return false;
// Construct list of paths.
bool retval = false;
gpr_strvec paths;
gpr_strvec_init(&paths);
for (grpc_json* child = json->child; child != NULL; child = child->next) {
if (child->key == NULL) continue;
if (strcmp(child->key, "name") == 0) {
if (child->type != GRPC_JSON_ARRAY) goto done;
for (grpc_json* name = child->child; name != NULL; name = name->next) {
char* path = parse_json_method_name(name);
gpr_strvec_add(&paths, path);
}
}
}
if (paths.count == 0) goto done; // No names specified.
// Add entry for each path.
for (size_t i = 0; i < paths.count; ++i) {
entries[*idx].key = grpc_mdstr_from_string(paths.strs[i]);
entries[*idx].value = vtable->copy_value(method_config);
entries[*idx].vtable = vtable;
++*idx;
}
retval = true;
done:
vtable->destroy_value(method_config);
gpr_strvec_destroy(&paths);
return retval;
}
grpc_mdstr_hash_table* grpc_service_config_create_method_config_table(
const grpc_service_config* service_config,
void* (*create_value)(const grpc_json* method_config_json),
const grpc_mdstr_hash_table_vtable* vtable) {
const grpc_json* json = service_config->json;
// Traverse parsed JSON tree.
if (json->type != GRPC_JSON_OBJECT || json->key != NULL) return NULL;
size_t num_entries = 0;
grpc_mdstr_hash_table_entry* entries = NULL;
for (grpc_json* field = json->child; field != NULL; field = field->next) {
if (field->key == NULL) return NULL;
if (strcmp(field->key, "method_config") == 0) {
if (entries != NULL) return NULL; // Duplicate.
if (field->type != GRPC_JSON_ARRAY) return NULL;
// Find number of entries.
for (grpc_json* method = field->child; method != NULL;
method = method->next) {
num_entries += count_names_in_method_config_json(method);
}
// Populate method config table entries.
entries = gpr_malloc(num_entries * sizeof(grpc_mdstr_hash_table_entry));
size_t idx = 0;
for (grpc_json* method = field->child; method != NULL;
method = method->next) {
if (!parse_json_method_config(method, create_value, vtable, entries,
&idx)) {
return NULL;
}
}
GPR_ASSERT(idx == num_entries);
}
}
// Instantiate method config table.
grpc_mdstr_hash_table* method_config_table = NULL;
if (entries != NULL) {
method_config_table = grpc_mdstr_hash_table_create(num_entries, entries);
// Clean up.
for (size_t i = 0; i < num_entries; ++i) {
GRPC_MDSTR_UNREF(entries[i].key);
vtable->destroy_value(entries[i].value);
}
gpr_free(entries);
}
return method_config_table;
}
void* grpc_method_config_table_get(const grpc_mdstr_hash_table* table,
const grpc_mdstr* path) {
void* value = grpc_mdstr_hash_table_get(table, path);
// If we didn't find a match for the path, try looking for a wildcard
// entry (i.e., change "/service/method" to "/service/*").
if (value == NULL) {
const char* path_str = grpc_mdstr_as_c_string(path);
const char* sep = strrchr(path_str, '/') + 1;
const size_t len = (size_t)(sep - path_str);
char* buf = gpr_malloc(len + 2); // '*' and NUL
memcpy(buf, path_str, len);
buf[len] = '*';
buf[len + 1] = '\0';
grpc_mdstr* wildcard_path = grpc_mdstr_from_string(buf);
gpr_free(buf);
value = grpc_mdstr_hash_table_get(table, wildcard_path);
GRPC_MDSTR_UNREF(wildcard_path);
}
return value;
}
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