Codegen overview

Developing a good service requires many routine code and types to be written. Sometimes it is handy to define types (and code) in declarative way out-of-code in external contracts and generate types/code from that. It allows one to separate external contracts and business logic, and to define these contracts in language agnostic way.

You may use code generators for the following activity:

• JSON schema codegen - the Chaotic
  • for PostgreSQL JSON/JSONB types
  • for dynamic configs
  • for static configs
  • for Kafka/RabbitMQ messages
• Chaotic clients
• Embedding SQL/YQL files via userver_add_sql_library

userver_embed_file and embedding files

For embedding arbitrary data there is a userver_embed_file CMake function:

userver_embed_file(${PROJECT_NAME}_config NAME static_config_yaml FILEPATH static_config.yaml)
target_link_libraries(${PROJECT_NAME} ${PROJECT_NAME}_config)

To use the embedded file from C++ just include the generated header and call utils::FindResource() function to get the embedded file contents:

int main(int, char*[]) {
    auto component_list = components::MinimalServerComponentList().Append<samples::hello::HelloHandler>();
 
    return utils::DaemonMain(components::InMemoryConfig{utils::FindResource("static_config_yaml")}, component_list);
}

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⇦ Periodics and DistLocks | JSON schema codegen - the Chaotic ⇨