Warn if PUSHGATEWAY is not provided

.github/workflows/ci.yml

@@ -17,9 +17,9 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Build docker image
-        run: docker-compose build
+        run: docker compose build
 
       - name: Run tests
-        run: docker-compose run test_and_cover
+        run: docker compose run test_and_cover
         env:
           GITHUB_TOKEN: ${{ secrets.github_token }}

Dockerfile

@@ -10,6 +10,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     libtest-exception-perl \
     libtest-spec-perl \
     libtest-time-perl \
+    libtest-warn-perl \
     libwww-perl \
     libyaml-perl \
     netcat

Makefile.PL

@@ -11,6 +11,7 @@ WriteMakefile(
   TEST_REQUIRES => {
     'Test::Spec'       => 0,
     'Test::Time'       => 0,
+    'Test::Warn'       => 0,
     'LWP::UserAgent'   => 0,
   },
   CONFIGURE_REQUIRES => { "ExtUtils::MakeMaker" => 0 },

README.md

@@ -40,6 +40,11 @@ $tracker->finalize;
 This will report the number of lines processed to the push gateway every 1,000
 lines.
 
+In order to report to the pushgateway, the `PUSHGATEWAY` environment variable
+must be set, or a `pushgateway` argument can be supplied to
+`ProgressTracker->new()`. Otherwise, `ProgressTracker` will warn this is not
+provided.
+
 ### Stages
 
 ```perl

docker-compose.yml

@@ -1,16 +1,17 @@
-version: '3'
+---
 
 services:
 
   test:
     build: .
     volumes:
       - .:/src
-    command: bin/wait-for --timeout=300 pushgateway:9091 -- prove
+    command: prove
     environment:
       - PUSHGATEWAY=http://pushgateway:9091
     depends_on:
-      - pushgateway
+      pushgateway:
+        condition: service_healthy
 
   test_and_cover:
     build: .
@@ -24,11 +25,19 @@ services:
       - GITHUB_REF
       - GITHUB_ACTIONS
       - PUSHGATEWAY=http://pushgateway:9091
-    command: bin/test_and_cover.sh
+    command: cover -test -report Coveralls 
     depends_on:
-      - pushgateway
+      pushgateway:
+        condition: service_healthy
 
   pushgateway:
     image: prom/pushgateway
     command:
       - --web.enable-admin-api
+    healthcheck:
+      test: [ "CMD", "wget", "--quiet", "--tries=1", "-O", "/dev/null", "pushgateway:9091/-/healthy" ]
+      x-healthcheck-defaults: &healthcheck-defaults
+      interval: 5s
+      timeout: 5s
+      start_period: 5s
+      retries: 5

lib/ProgressTracker.pm

@@ -21,7 +21,7 @@ sub new {
   $self->{labels} = { };
   $self->{job} = $params{job} || $ENV{'JOB_NAME'} || basename($0);
   $self->{pushgateway} = $params{pushgateway} || $ENV{'PUSHGATEWAY'};
-  die("Must specify pushgateway base URL with pushgateway param or PUSHGATEWAY env var") unless $self->{pushgateway};
+  $self->warn_not_reporting if !$self->{pushgateway};
 
   my $namespace =  $params{namespace} || $ENV{'JOB_NAMESPACE'};
   $self->{labels}{namespace} = $namespace if $namespace;
@@ -48,6 +48,11 @@ sub new {
 
 }
 
+sub warn_not_reporting {
+  my $self = shift;
+  warn("Push gateway base URL is not set; not reporting (set PUSHGATEWAY env var)");
+}
+
 sub label_names {
   my $self = shift;
 
@@ -107,6 +112,11 @@ sub finalize {
 sub push_metrics {
   my $self = shift;
 
+  if(!$self->{pushgateway}) {
+    $self->warn_not_reporting;
+    return;
+  }
+
   my $job = $self->{job};
   my $url = $self->{pushgateway} . "/metrics/job/$job";
   my $data = $self->{prom}->render;

t/progress_tracker.t

@@ -1,6 +1,7 @@
 use Test::Spec;
 use Test::Exception;
 use Test::Time;
+use Test::Warn;
 use ProgressTracker;
 use LWP::UserAgent;
 
@@ -32,10 +33,10 @@ describe "ProgressTracker" => sub {
     ok($tracker);
   };
 
-  it "requires pushgateway env var is set" => sub {
+  it "warns if pushgateway env var is not set" => sub {
     my $old_gateway = $ENV{PUSHGATEWAY};
     delete $ENV{PUSHGATEWAY};
-    dies_ok { ProgressTracker->new() };
+    warning_like { ProgressTracker->new() } qr/not reporting.*PUSHGATEWAY/;
 
     $ENV{PUSHGATEWAY} = $old_gateway;
   };
@@ -187,6 +188,15 @@ describe "ProgressTracker" => sub {
       ok(metrics !~ /^job_last_success/m);
     };
 
+    it "warns if pushgateway env var is not set" => sub {
+      my $old_gateway = $ENV{PUSHGATEWAY};
+      delete $ENV{PUSHGATEWAY};
+      my $tracker = ProgressTracker->new();
+      warning_like { $tracker->update_metrics; } qr/not reporting.*PUSHGATEWAY/;
+
+      $ENV{PUSHGATEWAY} = $old_gateway;
+    }
+
   };
 
   context "without stage" => sub {