userver: userver/storages/clickhouse/component.hpp Source File
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component.hpp
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1#pragma once
2
3/// @file userver/storages/clickhouse/component.hpp
4/// @brief @copybrief components::ClickHouse
5
6#include <userver/components/loggable_component_base.hpp>
7
8#include <userver/utils/statistics/storage.hpp>
9
10USERVER_NAMESPACE_BEGIN
11
12namespace clients::dns {
13class Component;
14}
15
16namespace storages::clickhouse {
17class Cluster;
18}
19
20namespace components {
21
22// clang-format off
23
24/// @ingroup userver_components
25///
26/// @brief ClickHouse client component
27///
28/// Provides access to a ClickHouse cluster.
29///
30/// ## Static configuration example:
31///
32/// @snippet samples/clickhouse_service/static_config.yaml Clickhouse service sample - static config
33///
34/// If the component is configured with an secdist_alias, it will lookup
35/// connection data in secdist.json via secdist_alias value, otherwise via
36/// components name.
37///
38/// ## Secdist format
39///
40/// A ClickHouse alias in secdist is described as a JSON object
41/// `clickhouse_settings`, containing descriptions of databases.
42///
43/// @snippet samples/clickhouse_service/tests/conftest.py Clickhouse service sample - secdist
44///
45/// ## Static options:
46/// Name | Description | Default value
47/// --------------------- | ------------------------------------------------ | ---------------
48/// secdist_alias | name of the key in secdist config | components name
49/// initial_pool_size | number of connections created initially | 5
50/// max_pool_size | maximum number of created connections | 10
51/// queue_timeout | client waiting for a free connection time limit | 1s
52/// use_secure_connection | whether to use TLS for connections | true
53/// compression | compression method to use (none / lz4) | none
54
55// clang-format on
56
58 public:
59 /// Component constructor
60 ClickHouse(const ComponentConfig&, const ComponentContext&);
61 /// Component destructor
62 ~ClickHouse() override;
63
64 /// Cluster accessor
65 std::shared_ptr<storages::clickhouse::Cluster> GetCluster() const;
66
67 static yaml_config::Schema GetStaticConfigSchema();
68
69 private:
70 clients::dns::Component& dns_;
71
72 std::shared_ptr<storages::clickhouse::Cluster> cluster_;
73 utils::statistics::Entry statistics_holder_;
74};
75
76template <>
77inline constexpr bool kHasValidate<ClickHouse> = true;
78
79} // namespace components
80
81USERVER_NAMESPACE_END