commit e02d01c18d2a1cf8f0d759b3be07a971b8e723e7
author lifr <lifr@google.com> Tue Dec 31 17:24:57 2019 +0800
committer Frank Li <lifr@google.com> Mon Jan 06 02:28:02 2020 +0000
tree c7d6fa12711a77d8d1198ff6d2305f7e5b4704c3
parent b9da5e9a8c17c3ca2af6c0c941200abbe29be0f5

Fill in DNS query type in DNS metric when DNS lookup hit cache

- When looking up DNS in cache, Rasta and DNS statistics are required
  Perform statistical analysis based on the type of DNS query.

The DNS stats proto shows "query type" as following:
============================================================
Without the commit:
        dns_query_events {
          dns_query_event {
            cache_hit: CS_FOUND
            latency_micros: 12
          }
With the commit:
        dns_query_events {
          dns_query_event {
            type: NS_T_AAAA <= ”DNS　query type”
            cache_hit: CS_FOUND
            latency_micros: 12
          }


Bug: 147031435
Test: statsd_testdrive
Change-Id: Iac6a6f819104247ecec65bb4134a33ddd66cfa9c

res_send.cpp

diff --git a/res_send.cpp b/res_send.cpp
index cef339a..3b088b9 100644
--- a/res_send.cpp
+++ b/res_send.cpp
@@ -418,6 +418,7 @@
         DnsQueryEvent* dnsQueryEvent = addDnsQueryEvent(statp->event);
         dnsQueryEvent->set_latency_micros(cacheLatencyUs);
         dnsQueryEvent->set_cache_hit(static_cast<CacheStatus>(cache_status));
+        dnsQueryEvent->set_type(getQueryType(buf, buflen));
         return anslen;
     } else if (cache_status != RESOLV_CACHE_UNSUPPORTED) {
         // had a cache miss for a known network, so populate the thread private