[fix](brpc_client_cache) resolve hostname in DNS cache before passing to brpc (#40074) #40786
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… to brpc (apache#40074) Currently brpc does not support resloving IPv6 hostnames, errors will be returned on `brpc::Channel::Init`. The brpc client cache may return `nullptr` on its `get_client` or `get_new_client_no_cache` APIs. This PR made the following changes: 1. Resolve hostnames from DNS cache before passing it to brpc. 2. Callers should check nullptr after get client, in case of failures.
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| if (!is_valid_ip(host)) { | ||
| Status status = ExecEnv::GetInstance()->dns_cache()->get(host, &realhost); | ||
| std::string realhost = host; | ||
| auto dns_cache = ExecEnv::GetInstance()->dns_cache(); |
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warning: 'auto dns_cache' can be declared as 'auto *dns_cache' [readability-qualified-auto]
| auto dns_cache = ExecEnv::GetInstance()->dns_cache(); | |
| auto *dns_cache = ExecEnv::GetInstance()->dns_cache(); |
| RETURN_IF_ERROR(request_embed_attachment_contain_blockv2(closure->request_.get(), closure)); | ||
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| std::string host = brpc_dest_addr.hostname; | ||
| auto dns_cache = ExecEnv::GetInstance()->dns_cache(); |
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warning: 'auto dns_cache' can be declared as 'auto *dns_cache' [readability-qualified-auto]
| auto dns_cache = ExecEnv::GetInstance()->dns_cache(); | |
| auto *dns_cache = ExecEnv::GetInstance()->dns_cache(); |
| } | ||
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| std::string host = _node_info.host; | ||
| auto dns_cache = ExecEnv::GetInstance()->dns_cache(); |
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warning: 'auto dns_cache' can be declared as 'auto *dns_cache' [readability-qualified-auto]
| auto dns_cache = ExecEnv::GetInstance()->dns_cache(); | |
| auto *dns_cache = ExecEnv::GetInstance()->dns_cache(); |
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backport #40074