rpc: further constrain the libevent workaround
The bug was introduced in 2.1.6-beta, versions before that don't need the workaround. zcash: currently, we build with libevent-2.1.12, so this fix is needed zcash: cherry picked from commit 97932cd2689659addfbb58dc6148928b73af3bd0 zcash: https://github.com/bitcoin/bitcoin/pull/11593
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@ -248,7 +248,7 @@ static std::string RequestMethodString(HTTPRequest::RequestMethod m)
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static void http_request_cb(struct evhttp_request* req, void* arg)
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{
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// Disable reading to work around a libevent bug, fixed in 2.2.0.
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if (event_get_version_number() < 0x02020001) {
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if (event_get_version_number() >= 0x02010600 && event_get_version_number() < 0x02020001) {
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evhttp_connection* conn = evhttp_request_get_connection(req);
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if (conn) {
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bufferevent* bev = evhttp_connection_get_bufferevent(conn);
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@ -620,7 +620,7 @@ void HTTPRequest::WriteReply(int nStatus, const std::string& strReply)
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evhttp_send_reply(req_copy, nStatus, nullptr, nullptr);
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// Re-enable reading from the socket. This is the second part of the libevent
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// workaround above.
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if (event_get_version_number() < 0x02020001) {
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if (event_get_version_number() >= 0x02010600 && event_get_version_number() < 0x02020001) {
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evhttp_connection* conn = evhttp_request_get_connection(req_copy);
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if (conn) {
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bufferevent* bev = evhttp_connection_get_bufferevent(conn);
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