fix: Error shouldn't halt the campaign for entire audience (#11980)

## Summary
- handle Twilio failures per contact when running one-off SMS campaigns
- rescue errors in WhatsApp and generic SMS one-off campaigns so they
continue
- add specs confirming campaigns continue sending when a single contact
fails

fixes:  https://github.com/chatwoot/chatwoot/issues/9000

Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>

app/services/sms/oneoff_sms_campaign_service.rb

@@ -29,5 +29,7 @@ class Sms::OneoffSmsCampaignService
 
   def send_message(to:, content:)
     channel.send_text_message(to, content)
+  rescue StandardError => e
+    Rails.logger.error("[SMS Campaign #{campaign.id}] Failed to send to #{to}: #{e.message}")
   end
 end

app/services/twilio/oneoff_sms_campaign_service.rb

@@ -23,7 +23,13 @@ class Twilio::OneoffSmsCampaignService
       next if contact.phone_number.blank?
 
       content = Liquid::CampaignTemplateService.new(campaign: campaign, contact: contact).call(campaign.message)
-      channel.send_message(to: contact.phone_number, body: content)
+
+      begin
+        channel.send_message(to: contact.phone_number, body: content)
+      rescue Twilio::REST::TwilioError, Twilio::REST::RestError => e
+        Rails.logger.error("[Twilio Campaign #{campaign.id}] Failed to send to #{contact.phone_number}: #{e.message}")
+        next
+      end
     end
   end
 end

app/services/whatsapp/oneoff_campaign_service.rb

@@ -89,6 +89,7 @@ class Whatsapp::OneoffCampaignService
   rescue StandardError => e
     Rails.logger.error "Failed to send WhatsApp template message to #{to}: #{e.message}"
     Rails.logger.error "Backtrace: #{e.backtrace.first(5).join('\n')}"
-    raise e
+    # continue processing remaining contacts
+    nil
   end
 end

spec/services/sms/oneoff_sms_campaign_service_spec.rb

@@ -20,6 +20,7 @@ describe Sms::OneoffSmsCampaignService do
         body: { 'id' => '1' }.to_json,
         headers: {}
       )
+      allow_any_instance_of(described_class).to receive(:channel).and_return(sms_channel) # rubocop:disable RSpec/AnyInstance
     end
 
     it 'raises error if the campaign is completed' do
@@ -52,5 +53,21 @@ describe Sms::OneoffSmsCampaignService do
 
       sms_campaign_service.perform
     end
+
+    it 'continues processing contacts when sending message raises an error' do
+      contact_error, contact_success = FactoryBot.create_list(:contact, 2, :with_phone_number, account: account)
+      contact_error.update_labels([label1.title])
+      contact_success.update_labels([label1.title])
+
+      error_message = 'SMS provider error'
+
+      expect(sms_channel).to receive(:send_text_message).with(contact_error.phone_number, anything).and_raise(StandardError, error_message)
+      expect(sms_channel).to receive(:send_text_message).with(contact_success.phone_number, anything).and_return(nil)
+
+      expect(Rails.logger).to receive(:error).with("[SMS Campaign #{campaign.id}] Failed to send to #{contact_error.phone_number}: #{error_message}")
+
+      sms_campaign_service.perform
+      expect(campaign.reload.completed?).to be true
+    end
   end
 end

spec/services/twilio/oneoff_sms_campaign_service_spec.rb

@@ -70,5 +70,36 @@ describe Twilio::OneoffSmsCampaignService do
 
       sms_campaign_service.perform
     end
+
+    it 'continues processing contacts when Twilio raises an error' do
+      contact_error, contact_success = FactoryBot.create_list(:contact, 2, :with_phone_number, account: account)
+      contact_error.update_labels([label1.title])
+      contact_success.update_labels([label1.title])
+
+      error = Twilio::REST::TwilioError.new("The 'To' number #{contact_error.phone_number} is not a valid phone number.")
+
+      allow(twilio_messages).to receive(:create).and_return(nil)
+
+      expect(twilio_messages).to receive(:create).with(
+        body: campaign.message,
+        messaging_service_sid: twilio_sms.messaging_service_sid,
+        to: contact_error.phone_number,
+        status_callback: 'http://localhost:3000/twilio/delivery_status'
+      ).and_raise(error)
+
+      expect(twilio_messages).to receive(:create).with(
+        body: campaign.message,
+        messaging_service_sid: twilio_sms.messaging_service_sid,
+        to: contact_success.phone_number,
+        status_callback: 'http://localhost:3000/twilio/delivery_status'
+      ).once
+
+      expect(Rails.logger).to receive(:error).with(
+        "[Twilio Campaign #{campaign.id}] Failed to send to #{contact_error.phone_number}: #{error.message}"
+      )
+
+      sms_campaign_service.perform
+      expect(campaign.reload.completed?).to be true
+    end
   end
 end

spec/services/whatsapp/oneoff_campaign_service_spec.rb

@@ -151,18 +151,23 @@ describe Whatsapp::OneoffCampaignService do
     end
 
     context 'when send_template raises an error' do
-      it 'logs error and re-raises' do
-        contact = create(:contact, :with_phone_number, account: account)
-        contact.update_labels([label1.title])
+      it 'logs error and continues processing remaining contacts' do
+        contact_error, contact_success = create_list(:contact, 2, :with_phone_number, account: account)
+        contact_error.update_labels([label1.title])
+        contact_success.update_labels([label1.title])
         error_message = 'WhatsApp API error'
 
-        allow(whatsapp_channel).to receive(:send_template).and_raise(StandardError, error_message)
+        allow(whatsapp_channel).to receive(:send_template).and_return(nil)
+
+        expect(whatsapp_channel).to receive(:send_template).with(contact_error.phone_number, anything).and_raise(StandardError, error_message)
+        expect(whatsapp_channel).to receive(:send_template).with(contact_success.phone_number, anything).once
 
         expect(Rails.logger).to receive(:error)
-          .with("Failed to send WhatsApp template message to #{contact.phone_number}: #{error_message}")
+          .with("Failed to send WhatsApp template message to #{contact_error.phone_number}: #{error_message}")
         expect(Rails.logger).to receive(:error).with(/Backtrace:/)
 
-        expect { described_class.new(campaign: campaign).perform }.to raise_error(StandardError, error_message)
+        described_class.new(campaign: campaign).perform
+        expect(campaign.reload.completed?).to be true
       end
     end
   end