Open 2024/11/13にコメント追加 11

NNG (NanoMsg NewGeneration)メモ

公式サイト
</span><a href="https://nng.nanomsg.org/" style="" target="_blank" rel="nofollow noopener noreferrer">https://nng.nanomsg.org/</a><br style=""/> 公式レポジトリ<br style=""/> <span class="embed-block zenn-embedded zenn-embedded-card"><iframe id="zenn-embedded__a57750aacb5af" src="https://embed.zenn.studio/card#zenn-embedded__a57750aacb5af" data-content="https%3A%2F%2Fgithub.com%2Fnanomsg%2Fnng" frameborder="0" scrolling="no" loading="lazy"/></span><a href="https://github.com/nanomsg/nng" style="" target="_blank" rel="nofollow noopener noreferrer">https://github.com/nanomsg/nng</a></p> <code>zeromq</code>同様ブローカーレス</li> <li data-line="10" class="code-line">先行する<code>nanomg</code>に対してスケーラビリティを追求したもの</li> <code>zeromq</code>や<code>nanomg</code>とは異なり、プロトコルごとに関数セットを分割している <li data-line="12" class="code-line">新しいプロトコルは、新しい関数セットを追加するだけ</li> <li data-line="13" class="code-line">APIの複雑さとのトレードオフ</li> </div></div><footer class="ThreadItemContent_footer__WEMyQ"><div class="LikeButton_container__YlckE style-icon"><button aria-label="いいね" class="LikeButton_button__ZwdG4" data-pressed="false"><svg class="LikeButton_svgLike__Gl0Sz" viewbox="0 0 110 110"><path class="LikeButton_svgLikeLine__f9txR" d="M73,24a23.78,23.78,0,0,0-15.89,6.19,3.14,3.14,0,0,1-4.18,0A23.81,23.81,0,0,0,37,24a22,22,0,0,0-22,22c0,16.67,19.64,32.82,25.11,37.93,2.84,2.65,6.15,5.64,8.92,8.13a8.9,8.9,0,0,0,11.9,0c2.77-2.49,6.07-5.48,8.91-8.13C75.37,78.81,95,62.66,95,46A22,22,0,0,0,73,24Z" fill="currentColor"/><path class="LikeButton_svgLikeInner__uiexS" d="M66.25,76.42c-.71.64-1.32,1.2-1.82,1.67-2.51,2.33-5.39,5-7.94,7.25a2.21,2.21,0,0,1-3,0C51,83,48.1,80.42,45.59,78.09c-.5-.47-1.12-1-1.82-1.67C38.09,71.29,23,57.67,23,46A14,14,0,0,1,37,32a15.92,15.92,0,0,1,11.65,5.23l4.73,5a2.2,2.2,0,0,0,3.23,0l4.72-5A16.06,16.06,0,0,1,73,32,14,14,0,0,1,87,46C87,57.67,71.93,71.29,66.25,76.42Z" fill="currentColor"/><g class="LikeButton_svgLikeDecoration__78UjB"><circle cx="41.5" cy="9.5" fill="#3ea8ff" r="3.5"/><circle cx="98.5" 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src="https://zenn-dev.github.io/default-avatars/dark/k.png" width="36"/></a><a class="ThreadHeader_userName__TmgaQ" href="/ktz_alias">ktz_alias</a><a class="ThreadHeader_dateContainer__349dg" href="#comment-6be1ca26dc3230"><time aria-label="2024年11月12日 19時23分" data-tooltip-for-desktop="true" data-tooltip-position="top" datetime="2024-11-12T10:23:00+00:00" role="tooltip">2024/11/12に更新</time></a><div class="ThreadHeader_actionContainer__8UItF"><button aria-label="メニューを開く" class="PopoverMenuButton_menuButton__hKCa_"><svg viewbox="0 0 27 27" height="16" width="16"><path fill="currentColor" d="M12.74,20.53,3.48,11.35a.75.75,0,0,1,0-1.07L4.71,9.05a.75.75,0,0,1,1.07,0l7.49,7.41,7.49-7.41a.74.74,0,0,1,1.06,0l1.24,1.23a.77.77,0,0,1,0,1.07L13.8,20.53A.74.74,0,0,1,12.74,20.53Z"/></svg></button></div></header><div class="ThreadItemContent_content__Ivb_O"><div class="InsertButtonToCodeBlock_insertButtonWrapper__ueql2"><div class="znc BodyCommentContent_bodyCommentContainer__5up6o"><h2 id="%E3%82%B3%E3%83%B3%E3%83%86%E3%82%AD%E3%82%B9%E3%83%88" data-line="0" class="code-line"> <a class="header-anchor-link" href="#%E3%82%B3%E3%83%B3%E3%83%86%E3%82%AD%E3%82%B9%E3%83%88" aria-hidden="true"/> コンテキスト</h2> <li data-line="2" class="code-line">1つのソケットを複数のスコープに分け、並行的に通信する考え <code>zeromq</code>のコンテキストとは考え方が違うことに注意</li> <code>raw</code>モードではサポートされない</li> <li data-line="5" class="code-line">一つの<code>REP</code>ソケットで複数の<code>REQ</code>を受信に使われる <li data-line="6" class="code-line">リクエストは非同期IOで受ける</li> <code>zeromq</code>ではポーリングで実現してたやつ</li> <li data-line="11" class="code-line">サーバ側の受信は1リクエスト複数コンテキスト</li> <li data-line="12" class="code-line">クライアント側は1リクエスト1コンテキスト</li> </div></div><footer class="ThreadItemContent_footer__WEMyQ"><div class="LikeButton_container__YlckE style-icon"><button aria-label="いいね" class="LikeButton_button__ZwdG4" data-pressed="false"><svg class="LikeButton_svgLike__Gl0Sz" viewbox="0 0 110 110"><path class="LikeButton_svgLikeLine__f9txR" 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aria-label="2024年11月12日 20時15分" data-tooltip-for-desktop="true" data-tooltip-position="top" datetime="2024-11-12T11:15:50+00:00" role="tooltip">2024/11/12に更新</time></a><div class="ThreadHeader_actionContainer__8UItF"><button aria-label="メニューを開く" class="PopoverMenuButton_menuButton__hKCa_"><svg viewbox="0 0 27 27" height="16" width="16"><path fill="currentColor" d="M12.74,20.53,3.48,11.35a.75.75,0,0,1,0-1.07L4.71,9.05a.75.75,0,0,1,1.07,0l7.49,7.41,7.49-7.41a.74.74,0,0,1,1.06,0l1.24,1.23a.77.77,0,0,1,0,1.07L13.8,20.53A.74.74,0,0,1,12.74,20.53Z"/></svg></button></div></header><div class="ThreadItemContent_content__Ivb_O"><div class="InsertButtonToCodeBlock_insertButtonWrapper__ueql2"><div class="znc BodyCommentContent_bodyCommentContainer__5up6o"><h2 id="%E3%83%88%E3%83%A9%E3%83%B3%E3%82%B9%E3%83%9D%E3%83%BC%E3%83%88%E3%83%AC%E3%82%A4%E3%83%A4%E3%83%BC" data-line="0" class="code-line"> <a class="header-anchor-link" href="#%E3%83%88%E3%83%A9%E3%83%B3%E3%82%B9%E3%83%9D%E3%83%BC%E3%83%88%E3%83%AC%E3%82%A4%E3%83%A4%E3%83%BC" aria-hidden="true"/> トランスポートレイヤー</h2> <p data-line="2" class="code-line"><code>nng</code>のトランスポートは<code>URL</code>を用いて<code>zeromq</code>に類似した記述を行う。</p> <p data-line="4" class="code-line">inproc (inproc://&lt;IDENTIFIRE&gt;)</p> <li data-line="5" class="code-line">同一プロセス内での通信</li> <li data-line="6" class="code-line">スレッド間をシェアードナッシングに保つのに役立つ</li> <li data-line="7" class="code-line">ゼロコピー</li> <li data-line="8" class="code-line">別アプリケーションで同じURLを使用しても干渉しない</li> <p data-line="9" class="code-line">ipc (ipc://&lt;PATH&gt;)</p> <li data-line="10" class="code-line">同一ホスト内の別プロセス間通信</li> <li data-line="11" class="code-line">UNIXプラットホームではPOSIXドメインソケットを使用</li> <li data-line="12" class="code-line">Windows環境では<code>PATH</code>として<code>UNC</code>や<code>名前付きパイプ</code>を使用する</li> <p data-line="13" class="code-line">BSDソケット (socket://...)</p> <li data-line="14" class="code-line">実体は<code>TCPソケット</code> <p data-line="8" class="code-line">NNG_OPT_WS_RECV_TEXT</p> <li data-line="9" class="code-line">(bool) Enable receiving of TEXT frames at the WebSocket layer. This option should only be used with the low level nng_stream API. When set, the stream will accept in-bound TEXT frames as well as BINARY frames.</li> <li data-line="10" class="code-line">The SP protocols (such as REQ) require BINARY frames as they pass binary protocol data. Hence this option should not be used with such protocols.</li> <li data-line="11" class="code-line">RFC 6455 requires that TEXT frames be discarded and the connection closed if the frame does not contain valid UTF-8 data. NNG does not perform any such validation. Applications that need to be strictly conformant should check for this themselves.</li> <p data-line="13" class="code-line">NNG_OPT_WS_SEND_TEXT</p> <li data-line="14" class="code-line">(bool) Enable sending of TEXT frames at the WebSocket layer. This option should only be used with the low level nng_stream API. When set, the stream will send TEXT frames instead of BINARY frames.</li> <li data-line="15" class="code-line">NNG does not check the frame data, and will attempt to send whatever the client requests. Peers that are compliant with RFC 6455 will discard TEXT frames (and break the connection) if they do not contain valid UTF-8.</li> <p data-line="17" class="code-line">NNG_OPT_TLS_CONFIG</p> <li data-line="18" class="code-line">(nng_tls_config *) The underlying TLS configuration object for wss:// endpoints. A hold is placed on the underlying configuration object before returning it. The caller should release the object with nng_tls_config_free() when it no longer needs the TLS configuration.</li> <li data-line="19" class="code-line">Use this option when advanced TLS configuration is required.</li> <p data-line="21" class="code-line">NNG_OPT_TLS_CA_FILE</p> <li data-line="22" class="code-line">(string) Write-only option naming a file containing certificates to use for peer validation. See nng_tls_config_ca_file() for more information.</li> <p data-line="24" class="code-line">NNG_OPT_TLS_CERT_KEY_FILE</p> <li data-line="25" class="code-line">(string) Write-only option naming a file containing the local certificate and associated private key. The private key used must be unencrypted. See nng_tls_config_own_cert() for more information.</li> <p data-line="27" class="code-line">NNG_OPT_TLS_AUTH_MODE</p> <li data-line="28" class="code-line">(int) Write-only option used to configure the authentication mode used. See nng_tls_config_auth_mode() for more details.</li> <p data-line="30" class="code-line">NNG_OPT_TLS_VERIFIED</p> <li data-line="31" class="code-line">(bool) Whether the remote peer has been properly verified using TLS authentication. May return incorrect results if peer authentication is disabled.</li> <p data-line="33" class="code-line">NNG_OPT_TLS_PEER_CN</p> <li data-line="34" class="code-line">(string) This read-only option returns the common name of the peer certificate. May return incorrect results if peer authentication is disabled.</li> <p data-line="36" class="code-line">NNG_OPT_TLS_PEER_ALT_NAMES</p> <li data-line="37" class="code-line">(string list) returns string list with the subject alternative names of the peer certificate. May return incorrect results if peer authentication is disabled.</li> </div></div><footer class="ThreadItemContent_footer__WEMyQ"><div class="LikeButton_container__YlckE style-icon"><button aria-label="いいね" class="LikeButton_button__ZwdG4" data-pressed="false"><svg class="LikeButton_svgLike__Gl0Sz" viewbox="0 0 110 110"><path class="LikeButton_svgLikeLine__f9txR" d="M73,24a23.78,23.78,0,0,0-15.89,6.19,3.14,3.14,0,0,1-4.18,0A23.81,23.81,0,0,0,37,24a22,22,0,0,0-22,22c0,16.67,19.64,32.82,25.11,37.93,2.84,2.65,6.15,5.64,8.92,8.13a8.9,8.9,0,0,0,11.9,0c2.77-2.49,6.07-5.48,8.91-8.13C75.37,78.81,95,62.66,95,46A22,22,0,0,0,73,24Z" fill="currentColor"/><path class="LikeButton_svgLikeInner__uiexS" 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class="ThreadItemContent_addReplyContainer__cV93C"><button class="ThreadItemContent_addReplyButton__2Y8xI">返信を追加</button></div></article></div><div class="ScrapThread_item__zTzyN"><article class="ThreadItemContent_parentItem__2BweX" id="comment-ff4b677baa8f29"><header class="ThreadHeader_header__rscC4"><a class="ThreadHeader_userAvatar__zumMm" href="/ktz_alias"><img alt="ktz_alias" class="AvatarImage_plain__Fgp4R " height="36" loading="lazy" referrerpolicy="no-referrer" src="https://zenn-dev.github.io/default-avatars/dark/k.png" width="36"/></a><a class="ThreadHeader_userName__TmgaQ" href="/ktz_alias">ktz_alias</a><a class="ThreadHeader_dateContainer__349dg" href="#comment-ff4b677baa8f29"><time aria-label="2024年11月12日 20時14分" data-tooltip-for-desktop="true" data-tooltip-position="top" datetime="2024-11-12T11:14:22+00:00" role="tooltip">2024/11/12に更新</time></a><div class="ThreadHeader_actionContainer__8UItF"><button aria-label="メニューを開く" class="PopoverMenuButton_menuButton__hKCa_"><svg viewbox="0 0 27 27" height="16" width="16"><path fill="currentColor" d="M12.74,20.53,3.48,11.35a.75.75,0,0,1,0-1.07L4.71,9.05a.75.75,0,0,1,1.07,0l7.49,7.41,7.49-7.41a.74.74,0,0,1,1.06,0l1.24,1.23a.77.77,0,0,1,0,1.07L13.8,20.53A.74.74,0,0,1,12.74,20.53Z"/></svg></button></div></header><div class="ThreadItemContent_content__Ivb_O"><div class="InsertButtonToCodeBlock_insertButtonWrapper__ueql2"><div class="znc BodyCommentContent_bodyCommentContainer__5up6o"><h2 id="%E3%83%97%E3%83%AD%E3%83%88%E3%82%B3%E3%83%AB" data-line="0" class="code-line"> <a class="header-anchor-link" href="#%E3%83%97%E3%83%AD%E3%83%88%E3%82%B3%E3%83%AB" aria-hidden="true"/> プロトコル</h2> <li data-line="2" class="code-line">REQ/REP <li data-line="3" class="code-line">req -&gt; rep -&gt; reqの一方向通信</li> <li data-line="4" class="code-line">req: <code>nng_req0_open</code>関数でソケットを作成する</li> <li data-line="5" class="code-line">rep: <code>nng_rep0_open</code>関数でソケットを作成する</li> <li data-line="6" class="code-line">コンテキストサポート</li> <li data-line="7" class="code-line">PUB/SUB <li data-line="8" class="code-line">pub -&gt; subの一方向通信</li> <li data-line="9" class="code-line">pub: <code>nng_pub0_open</code>関数でソケットを作成する</li> <li data-line="10" class="code-line">sub: <code>nng_sub0_open</code>関数でソケットを作成する</li> <li data-line="11" class="code-line">PUSH/PULL <li data-line="12" class="code-line">push -&gt; pullの一方向通信</li> <li data-line="13" class="code-line">push: <code>nng_push0_open</code>関数でソケットを作成する</li> <li data-line="14" class="code-line">pull: <code>nng_pull0_open</code>関数でソケットを作成する</li> <li data-line="16" class="code-line">p2pの双方向通信</li> <code>nng_pair0_open</code>関数でソケットを作成する</li> <li data-line="18" class="code-line">SURVAYOR/RESPONDENT <li data-line="19" class="code-line">survayor -&gt; respondantの一方向通信</li> <li data-line="20" class="code-line">SURVAYOR: ブロードキャスト <code>nng_surveyor0_open</code>関数でソケットを作成する</li> <li data-line="22" class="code-line">コンテキストサポート <li data-line="23" class="code-line">複数のリクエストを一斉配信</li> <li data-line="24" class="code-line">最新の返信を採用</li> <div class="code-block-container"><pre class="language-zig"><code class="language-zig code-line" data-line="16"><span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">nng_aio_wait</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 一つ目のソケットの待機</span> <span class="token function">nng_aio_wait</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 二つ目のソケットの待機</span> </code></pre></div><p data-line="23" class="code-line">とすると、一つ目のソケットの処理が完了するまで、二つ目のソケットの処理が行えなくなり、スループットが低下する。</p> <p data-line="25" class="code-line">回避策として、それぞれのソケット用に別スレッドを起動して、そこで待機させる。<br/> 無限ループのままだとスレッドを終わらせることができないため、キャンセルやソケットクローズかどうかの判定も行う。</p> <div class="code-block-container"><pre class="language-zig"><code class="language-zig code-line" data-line="28"><span class="token keyword">while</span> <span class="token punctuation">(</span><span class="token boolean">true</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token function">nng_aio_wait</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token keyword">switch</span> <span class="token punctuation">(</span><span class="token function">nng_ctx_result</span><span class="token punctuation">(</span><span class="token operator">...</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> NNG_ECANCELED <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> <span class="token comment">// キャンセルされた場合</span> <span class="token keyword">break</span><span class="token punctuation">;</span> NNG_ECLOSED <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> <span class="token comment">// ソケットがクローズされた場合</span> <span class="token keyword">break</span><span class="token punctuation">;</span> <span class="token keyword">else</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span> <span class="token comment">// 正常系</span> <span class="token comment">// 受け取ったメッセージをハンドリングする</span> </code></pre></div></div></div><footer class="ThreadItemContent_footer__WEMyQ"><div class="LikeButton_container__YlckE style-icon"><button aria-label="いいね" class="LikeButton_button__ZwdG4" data-pressed="false"><svg class="LikeButton_svgLike__Gl0Sz" viewbox="0 0 110 110"><path class="LikeButton_svgLikeLine__f9txR" 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cy="48.5" fill="#c067f4" r="3.5"/><circle cx="4.5" cy="60.5" fill="#3ea8ff" r="3.5"/><circle cx="94.5" cy="73.5" fill="#3ea8ff" r="1.5"/><circle cx="16.5" cy="75.5" fill="#ffdc6e" r="1.5"/><circle cx="78.5" cy="91.5" fill="#ffdc6e" r="1.5"/></g></svg></button></div></footer></div><div class="ThreadItemContent_addReplyContainer__cV93C"><button class="ThreadItemContent_addReplyButton__2Y8xI">返信を追加</button></div></article></div><div class="ScrapThread_item__zTzyN"><article class="ThreadItemContent_parentItem__2BweX" id="comment-1e2743a993c802"><header class="ThreadHeader_header__rscC4"><a class="ThreadHeader_userAvatar__zumMm" href="/ktz_alias"><img alt="ktz_alias" class="AvatarImage_plain__Fgp4R " height="36" loading="lazy" referrerpolicy="no-referrer" src="https://zenn-dev.github.io/default-avatars/dark/k.png" width="36"/></a><a class="ThreadHeader_userName__TmgaQ" href="/ktz_alias">ktz_alias</a><a class="ThreadHeader_dateContainer__349dg" href="#comment-1e2743a993c802"><time aria-label="2024年11月12日 20時1分" data-tooltip-for-desktop="true" data-tooltip-position="top" datetime="2024-11-12T11:01:48+00:00" role="tooltip">2024/11/12に更新</time></a><div class="ThreadHeader_actionContainer__8UItF"><button aria-label="メニューを開く" class="PopoverMenuButton_menuButton__hKCa_"><svg viewbox="0 0 27 27" height="16" width="16"><path fill="currentColor" d="M12.74,20.53,3.48,11.35a.75.75,0,0,1,0-1.07L4.71,9.05a.75.75,0,0,1,1.07,0l7.49,7.41,7.49-7.41a.74.74,0,0,1,1.06,0l1.24,1.23a.77.77,0,0,1,0,1.07L13.8,20.53A.74.74,0,0,1,12.74,20.53Z"/></svg></button></div></header><div class="ThreadItemContent_content__Ivb_O"><div class="InsertButtonToCodeBlock_insertButtonWrapper__ueql2"><div class="znc BodyCommentContent_bodyCommentContainer__5up6o"><h2 id="%E5%8F%97%E4%BF%A1%E3%81%AE%E5%A4%9A%E9%87%8D%E5%8C%96%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6" data-line="0" class="code-line"> <a class="header-anchor-link" href="#%E5%8F%97%E4%BF%A1%E3%81%AE%E5%A4%9A%E9%87%8D%E5%8C%96%E3%81%AB%E3%81%A4%E3%81%84%E3%81%A6" aria-hidden="true"/> 受信の多重化について</h2> <li data-line="2" class="code-line">後方互換性のため<code>nng_poll</code>が残されてはいるが、非同期IO+コンテキストで組むことが基本。</li> <li data-line="3" class="code-line">非同期IO+コンテキストの場合、単に複数のソケットを受信待ちにしておけばよく、やってきたものから順に処理してくれる。 <li data-line="4" class="code-line">ただし場合によってはREQ-&gt;REQになる可能性もあるため、自前での状態遷移の管理とキューイングが重要</li> </div></div><footer class="ThreadItemContent_footer__WEMyQ"><div class="LikeButton_container__YlckE style-icon"><button aria-label="いいね" class="LikeButton_button__ZwdG4" data-pressed="false"><svg class="LikeButton_svgLike__Gl0Sz" viewbox="0 0 110 110"><path class="LikeButton_svgLikeLine__f9txR" d="M73,24a23.78,23.78,0,0,0-15.89,6.19,3.14,3.14,0,0,1-4.18,0A23.81,23.81,0,0,0,37,24a22,22,0,0,0-22,22c0,16.67,19.64,32.82,25.11,37.93,2.84,2.65,6.15,5.64,8.92,8.13a8.9,8.9,0,0,0,11.9,0c2.77-2.49,6.07-5.48,8.91-8.13C75.37,78.81,95,62.66,95,46A22,22,0,0,0,73,24Z" 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r="1.5"/></g></svg></button></div></footer></div><div class="ThreadItemContent_addReplyContainer__cV93C"><button class="ThreadItemContent_addReplyButton__2Y8xI">返信を追加</button></div></article></div><div class="ScrapThread_item__zTzyN"><article class="ThreadItemContent_parentItem__2BweX" id="comment-3f077b917b853d"><header class="ThreadHeader_header__rscC4"><a class="ThreadHeader_userAvatar__zumMm" href="/ktz_alias"><img alt="ktz_alias" class="AvatarImage_plain__Fgp4R " height="36" loading="lazy" referrerpolicy="no-referrer" src="https://zenn-dev.github.io/default-avatars/dark/k.png" width="36"/></a><a class="ThreadHeader_userName__TmgaQ" href="/ktz_alias">ktz_alias</a><a class="ThreadHeader_dateContainer__349dg" href="#comment-3f077b917b853d"><time aria-label="2024年11月12日 20時0分" data-tooltip-for-desktop="true" data-tooltip-position="top" datetime="2024-11-12T11:00:36+00:00" role="tooltip">2024/11/12</time></a><div class="ThreadHeader_actionContainer__8UItF"><button aria-label="メニューを開く" class="PopoverMenuButton_menuButton__hKCa_"><svg viewbox="0 0 27 27" height="16" width="16"><path fill="currentColor" d="M12.74,20.53,3.48,11.35a.75.75,0,0,1,0-1.07L4.71,9.05a.75.75,0,0,1,1.07,0l7.49,7.41,7.49-7.41a.74.74,0,0,1,1.06,0l1.24,1.23a.77.77,0,0,1,0,1.07L13.8,20.53A.74.74,0,0,1,12.74,20.53Z"/></svg></button></div></header><div class="ThreadItemContent_content__Ivb_O"><div class="InsertButtonToCodeBlock_insertButtonWrapper__ueql2"><div class="znc BodyCommentContent_bodyCommentContainer__5up6o"><h2 id="helo%E3%83%A1%E3%83%83%E3%82%BB%E3%83%BC%E3%82%B8" data-line="0" class="code-line"> <a class="header-anchor-link" href="#helo%E3%83%A1%E3%83%83%E3%82%BB%E3%83%BC%E3%82%B8" aria-hidden="true"/> HELOメッセージ</h2> <p data-line="2" class="code-line">サーバが<code>nng_listen</code>でバインド後、<code>nng_ctx_recv</code>を呼ぶことでやっと受信待ちにできる</p> <li data-line="4" class="code-line">しかしクライアントは<code>nng_listen</code>でバインドが完了していれば、<code>nng_connect</code>は成功する</li> <code>nng_ctx_recv</code>未完了で投げられたメッセージは捨てられる</li> <p data-line="7" class="code-line">クライアントは<code>nng_connect</code>を呼んだ後</p> <li data-line="9" class="code-line">サーバに<code>HELO</code>メッセージを送る</li>

NNGとは