statsd: add a chance to set hostname and port in hydra.conf

Co-authored-by: Graham Christensen <graham@grahamc.com>

src/lib/Hydra/Helper/Nix.pm

@@ -15,7 +15,7 @@ use IPC::Run;
 our @ISA = qw(Exporter);
 our @EXPORT = qw(
     getHydraHome getHydraConfig getBaseUrl
-    getSCMCacheDir
+    getSCMCacheDir getStatsdConfig
     registerRoot getGCRootsDir gcRootFor
     jobsetOverview jobsetOverview_
     getDrvLogPath findLog
@@ -55,6 +55,23 @@ sub getHydraConfig {
 }
 
 
+# Return hash of statsd configuration of the following shape:
+# (
+#   host => string,
+#   port => digit
+# )
+sub getStatsdConfig {
+    my ($config) = @_;
+    my $cfg = $config->{statsd};
+    my %statsd = defined $cfg ? ref $cfg eq "HASH" ? %$cfg : ($cfg) : ();
+
+    return {
+        "host" => %statsd{'host'}  // 'localhost',
+        "port" => %statsd{'port'}  // 8125,
+    }
+}
+
+
 sub getBaseUrl {
     my ($config) = @_;
     return $config->{'base_uri'} // "http://" . hostname_long . ":3000";

src/script/hydra-eval-jobset

@@ -33,6 +33,10 @@ my $plugins = [Hydra::Plugin->instantiate(db => $db, config => $config)];
 
 my $dryRun = defined $ENV{'HYDRA_DRY_RUN'};
 
+my $statsdConfig = Hydra::Helper::Nix::getStatsdConfig($config);
+$Net::Statsd::HOST = $statsdConfig->{'host'};
+$Net::Statsd::PORT = $statsdConfig->{'port'};
+
 alarm 3600; # FIXME: make configurable
 
 

src/script/hydra-send-stats

@@ -9,6 +9,11 @@ use JSON;
 STDERR->autoflush(1);
 binmode STDERR, ":encoding(utf8)";
 
+my $config = getHydraConfig();
+my $statsdConfig = Hydra::Helper::Nix::getStatsdConfig($config);
+$Net::Statsd::HOST = $statsdConfig->{'host'};
+$Net::Statsd::PORT = $statsdConfig->{'port'};
+
 sub gauge {
     my ($name, $val) = @_;
     die unless defined $val;