userver: clients::dns::Component Class Reference
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clients::dns::Component Class Referencefinal

#include <userver/clients/dns/component.hpp>

Detailed Description

Caching DNS resolver component.

Returned references to clients::dns::Resolver live for a lifetime of the component and are safe for concurrent use.

Static options:

Name Description Default value
fs-task-processor task processor for disk I/O operations -
hosts-file-path path to the hosts file /etc/hosts
hosts-file-update-interval hosts file cache reload interval 5m
network-timeout timeout for network requests 1s
network-attempts number of attempts for network requests 1
network-custom-servers list of name servers to use from /etc/resolv.conf
cache-ways number of ways for network cache 16
cache-size-per-way size of each way of network cache 256
cache-max-reply-ttl TTL limit for network replies caching 5m
cache-failure-ttl TTL for network failures caching 5s

Static configuration example:

# yaml
fs-task-processor: fs-task-processor
hosts-file-path: /etc/hosts
hosts-file-update-interval: 5m
network-timeout: 1s
network-attempts: 1
cache-ways: 16
cache-size-per-way: 256
cache-max-reply-ttl: 5m
cache-failure-ttl: 5s
samples/http_caching/http_caching.cpp, samples/mongo_service/mongo_service.cpp, samples/postgres_auth/postgres_service.cpp, samples/redis_service/redis_service.cpp, and samples/tcp_full_duplex_service/tcp_full_duplex_service.cpp.

Definition at line 42 of file component.hpp.

+ Inheritance diagram for clients::dns::Component:
+ Collaboration diagram for clients::dns::Component:

Public Member Functions

 Component (const components::ComponentConfig &, const components::ComponentContext &)
ResolverGetResolver ()
- Public Member Functions inherited from components::ComponentBase
 ComponentBase (const ComponentConfig &, const ComponentContext &)
 ComponentBase (ComponentBase &&)=delete
 ComponentBase (const ComponentBase &)=delete
 ~ComponentBase () override=default
ComponentHealth GetComponentHealth () const override
void OnLoadingCancelled () override
void OnAllComponentsLoaded () override
void OnAllComponentsAreStopping () override
- Public Member Functions inherited from components::RawComponentBase
 RawComponentBase (RawComponentBase &&)=delete
 RawComponentBase (const RawComponentBase &)=delete

Static Public Member Functions

static yaml_config::Schema GetStaticConfigSchema ()
- Static Public Member Functions inherited from components::ComponentBase
static yaml_config::Schema GetStaticConfigSchema ()
- Static Public Member Functions inherited from components::RawComponentBase
static yaml_config::Schema GetStaticConfigSchema ()

Static Public Attributes

static constexpr std::string_view kName = "dns-client"
 The default name of clients::dns::Component component.

Additional Inherited Members

- Protected Types inherited from components::ComponentBase
using LoggableComponentBase = ComponentBase
 Legacy alias, use ComponentBase instead.

The documentation for this class was generated from the following file: