Accept user-defined dashboard uids in Grafana embeds

app/services/metrics/dashboard/grafana_metric_embed_service.rb

@@ -133,7 +133,7 @@ module Metrics
       def uid_regex
         base_url = @project.grafana_integration.grafana_url.chomp('/')
 
-        %r{(#{Regexp.escape(base_url)}\/d\/(?<uid>\w+)\/)}x
+        %r{^(#{Regexp.escape(base_url)}\/d\/(?<uid>.+)\/)}x
       end
     end
 

changelogs/unreleased/sy-grafana-fix-uid.yml

+---
+title: Accept user-defined dashboard uids in Grafana embeds
+merge_request: 20486
+author:
+type: fixed

spec/services/metrics/dashboard/grafana_metric_embed_service_spec.rb

@@ -175,3 +175,64 @@ describe Metrics::Dashboard::GrafanaMetricEmbedService do
     end
   end
 end
+
+describe Metrics::Dashboard::GrafanaUidParser do
+  let_it_be(:grafana_integration) { create(:grafana_integration) }
+  let_it_be(:project) { grafana_integration.project }
+
+  subject { described_class.new(grafana_url, project).parse }
+
+  context 'with a Grafana-defined uid' do
+    let(:grafana_url) { grafana_integration.grafana_url + '/d/XDaNK6amz/?panelId=1' }
+
+    it { is_expected.to eq 'XDaNK6amz' }
+  end
+
+  context 'with a user-defined uid' do
+    let(:grafana_url) { grafana_integration.grafana_url + '/d/pgbouncer-main/pgbouncer-overview?panelId=1' }
+
+    it { is_expected.to eq 'pgbouncer-main' }
+  end
+
+  context 'when a uid is not present' do
+    let(:grafana_url) { grafana_integration.grafana_url }
+
+    it { is_expected.to be nil }
+  end
+
+  context 'when the url starts with unrelated content' do
+    let(:grafana_url) { 'js:' + grafana_integration.grafana_url }
+
+    it { is_expected.to be nil }
+  end
+end
+
+describe Metrics::Dashboard::DatasourceNameParser do
+  include GrafanaApiHelpers
+
+  let(:grafana_url) { valid_grafana_dashboard_link('https://gitlab.grafana.net') }
+  let(:grafana_dashboard) { JSON.parse(fixture_file('grafana/dashboard_response.json'), symbolize_names: true) }
+
+  subject { described_class.new(grafana_url, grafana_dashboard).parse }
+
+  it { is_expected.to eq 'GitLab Omnibus' }
+
+  context 'when the panelId is missing from the url' do
+    let(:grafana_url) { 'https:/gitlab.grafana.net/d/jbdbks/' }
+
+    it { is_expected.to be nil }
+  end
+
+  context 'when the panel is not present' do
+    # We're looking for panelId of 8, but only 6 is present
+    let(:grafana_dashboard) { { dashboard: { panels: [{ id: 6 }] } } }
+
+    it { is_expected.to be nil }
+  end
+
+  context 'when the dashboard panel does not have a datasource' do
+    let(:grafana_dashboard) { { dashboard: { panels: [{ id: 8 }] } } }
+
+    it { is_expected.to be nil }
+  end
+end