1 files changed, 93 insertions, 0 deletions
diff --git a/src/shrpx_dual_dns_resolver.cc b/src/shrpx_dual_dns_resolver.cc
new file mode 100644
index 0000000..8c6c5c9
--- /dev/null
+++ b/src/shrpx_dual_dns_resolver.cc
@@ -0,0 +1,93 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2016 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "shrpx_dual_dns_resolver.h"
+
+namespace shrpx {
+
+DualDNSResolver::DualDNSResolver(struct ev_loop *loop, int family)
+    : family_(family), resolv4_(loop), resolv6_(loop) {
+  auto cb = [this](DNSResolverStatus, const Address *) {
+    Address result;
+
+    auto status = this->get_status(&result);
+    switch (status) {
+    case DNSResolverStatus::ERROR:
+    case DNSResolverStatus::OK:
+      break;
+    default:
+      return;
+    }
+
+    auto cb = this->get_complete_cb();
+    cb(status, &result);
+  };
+
+  if (family_ == AF_UNSPEC || family_ == AF_INET) {
+    resolv4_.set_complete_cb(cb);
+  }
+  if (family_ == AF_UNSPEC || family_ == AF_INET6) {
+    resolv6_.set_complete_cb(cb);
+  }
+}
+
+int DualDNSResolver::resolve(const StringRef &host) {
+  int rv4 = 0, rv6 = 0;
+  if (family_ == AF_UNSPEC || family_ == AF_INET) {
+    rv4 = resolv4_.resolve(host, AF_INET);
+  }
+  if (family_ == AF_UNSPEC || family_ == AF_INET6) {
+    rv6 = resolv6_.resolve(host, AF_INET6);
+  }
+
+  if (rv4 != 0 && rv6 != 0) {
+    return -1;
+  }
+
+  return 0;
+}
+
+CompleteCb DualDNSResolver::get_complete_cb() const { return complete_cb_; }
+
+void DualDNSResolver::set_complete_cb(CompleteCb cb) { complete_cb_ = cb; }
+
+DNSResolverStatus DualDNSResolver::get_status(Address *result) const {
+  auto rv6 = resolv6_.get_status(result);
+  if (rv6 == DNSResolverStatus::OK) {
+    return DNSResolverStatus::OK;
+  }
+  auto rv4 = resolv4_.get_status(result);
+  if (rv4 == DNSResolverStatus::OK) {
+    return DNSResolverStatus::OK;
+  }
+  if (rv4 == DNSResolverStatus::RUNNING || rv6 == DNSResolverStatus::RUNNING) {
+    return DNSResolverStatus::RUNNING;
+  }
+  if (rv4 == DNSResolverStatus::ERROR || rv6 == DNSResolverStatus::ERROR) {
+    return DNSResolverStatus::ERROR;
+  }
+  return DNSResolverStatus::IDLE;
+}
+
+} // namespace shrpx