1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
//
// Copyright 2016 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#ifndef GRPC_CORE_LIB_SERVICE_CONFIG_SERVICE_CONFIG_PARSER_H
#define GRPC_CORE_LIB_SERVICE_CONFIG_SERVICE_CONFIG_PARSER_H
#include <grpc/support/port_platform.h>
#include <memory>
#include <vector>
#include <grpc/impl/codegen/grpc_types.h>
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/json/json.h"
namespace grpc_core {
// Service config parser registry.
// See service_config.h for more information.
class ServiceConfigParser {
public:
/// This is the base class that all service config parsers MUST use to store
/// parsed service config data.
class ParsedConfig {
public:
virtual ~ParsedConfig() = default;
};
/// This is the base class that all service config parsers should derive from.
class Parser {
public:
virtual ~Parser() = default;
virtual absl::string_view name() const = 0;
virtual std::unique_ptr<ParsedConfig> ParseGlobalParams(
const grpc_channel_args*, const Json& /* json */,
grpc_error_handle* error) {
// Avoid unused parameter warning on debug-only parameter
(void)error;
GPR_DEBUG_ASSERT(error != nullptr);
return nullptr;
}
virtual std::unique_ptr<ParsedConfig> ParsePerMethodParams(
const grpc_channel_args*, const Json& /* json */,
grpc_error_handle* error) {
// Avoid unused parameter warning on debug-only parameter
(void)error;
GPR_DEBUG_ASSERT(error != nullptr);
return nullptr;
}
};
using ServiceConfigParserList = std::vector<std::unique_ptr<Parser>>;
using ParsedConfigVector = std::vector<std::unique_ptr<ParsedConfig>>;
class Builder {
public:
/// Globally register a service config parser. Each new service config
/// update will go through all the registered parser. Each parser is
/// responsible for reading the service config json and returning a parsed
/// config.
void RegisterParser(std::unique_ptr<Parser> parser);
ServiceConfigParser Build();
private:
ServiceConfigParserList registered_parsers_;
};
ParsedConfigVector ParseGlobalParameters(const grpc_channel_args* args,
const Json& json,
grpc_error_handle* error) const;
ParsedConfigVector ParsePerMethodParameters(const grpc_channel_args* args,
const Json& json,
grpc_error_handle* error) const;
// Return the index for a given registered parser.
// If there is an error, return -1.
size_t GetParserIndex(absl::string_view name) const;
private:
explicit ServiceConfigParser(ServiceConfigParserList registered_parsers)
: registered_parsers_(std::move(registered_parsers)) {}
ServiceConfigParserList registered_parsers_;
};
} // namespace grpc_core
#endif /* GRPC_CORE_LIB_SERVICE_CONFIG_SERVICE_CONFIG_PARSER_H */
|
