Repository: flexprice/flexprice
Pull request #245: feat(events): config driven post processing consumption
Author: login: nkmishra1997
Created: 2025-05-09T22:25:41Z | Merged: 2025-05-11T21:16:27Z


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> [!IMPORTANT]
> Introduce configuration-driven event post-processing with dynamic topic and rate limit settings, and enhance cost calculation with rounding control.
> 
>   - **Behavior**:
>     - `startPostProcessingConsumer` in `main.go` now accepts `cfg` to configure post-processing consumer.
>     - `RegisterHandler` in `event_post_processing.go` uses `cfg` for topic and rate limit.
>     - `PublishEvent` in `event_post_processing.go` uses `cfg.EventPostProcessing.Topic`.
>   - **Configuration**:
>     - Adds `EventPostProcessingConfig` to `config.go` and `config.yaml` for topic and rate limit.
>   - **Service**:
>     - `CalculateCostWithBreakup` in `price.go` now accepts a `round` parameter to control cost rounding.
>   - **Tests**:
>     - Adds `event_post_processing_test.go` for post-processing service tests.
>     - Updates `price_test.go` to test `CalculateCostWithBreakup` with `round` parameter.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis" src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=flexprice%2Fflexprice&utm_source=github&utm_medium=referral)<sup> for b625cb6f213b5bf3aa9839e283b851eba348321f. You can [customize](https://app.ellipsis.dev/flexprice/settings/summaries) this summary. It will automatically update as commits are pushed.</sup>


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Diff:
diff --git a/cmd/server/main.go b/cmd/server/main.go
index 7fba353f7..a5ba26ff5 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -284,7 +284,7 @@ func startServer(
 		startAPIServer(lc, r, cfg, log)
 		startConsumer(lc, consumer, eventRepo, cfg, log, sentryService, eventPostProcessingSvc)
 		startMessageRouter(lc, router, webhookService, onboardingService, log)
-		startPostProcessingConsumer(lc, router, eventPostProcessingSvc, log)
+		startPostProcessingConsumer(lc, router, eventPostProcessingSvc, cfg, log)
 		startTemporalWorker(lc, temporalClient, &cfg.Temporal, log)
 	case types.ModeAPI:
 		startAPIServer(lc, r, cfg, log)
@@ -297,7 +297,7 @@ func startServer(
 			log.Fatal("Kafka consumer required for consumer mode")
 		}
 		startConsumer(lc, consumer, eventRepo, cfg, log, sentryService, eventPostProcessingSvc)
-		startPostProcessingConsumer(lc, router, eventPostProcessingSvc, log)
+		startPostProcessingConsumer(lc, router, eventPostProcessingSvc, cfg, log)
 	case types.ModeAWSLambdaAPI:
 		startAWSLambdaAPI(r)
 		startMessageRouter(lc, router, webhookService, onboardingService, log)
@@ -579,10 +579,11 @@ func startPostProcessingConsumer(
 	lc fx.Lifecycle,
 	router *pubsubRouter.Router,
 	eventPostProcessingSvc service.EventPostProcessingService,
+	cfg *config.Configuration,
 	logger *logger.Logger,
 ) {
 	// Register handlers before starting the router
-	eventPostProcessingSvc.RegisterHandler(router)
+	eventPostProcessingSvc.RegisterHandler(router, cfg)
 
 	lc.Append(fx.Hook{
 		OnStart: func(ctx context.Context) error {
diff --git a/internal/config/config.go b/internal/config/config.go
index 4663a5a9e..b4d1d05aa 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -16,22 +16,23 @@ import (
 )
 
 type Configuration struct {
-	Deployment DeploymentConfig `validate:"required"`
-	Server     ServerConfig     `validate:"required"`
-	Auth       AuthConfig       `validate:"required"`
-	Kafka      KafkaConfig      `validate:"required"`
-	ClickHouse ClickHouseConfig `validate:"required"`
-	Logging    LoggingConfig    `validate:"required"`
-	Postgres   PostgresConfig   `validate:"required"`
-	Sentry     SentryConfig     `validate:"required"`
-	Event      EventConfig      `validate:"required"`
-	DynamoDB   DynamoDBConfig   `validate:"required"`
-	Temporal   TemporalConfig   `validate:"required"`
-	Webhook    Webhook          `validate:"omitempty"`
-	Secrets    SecretsConfig    `validate:"required"`
-	Billing    BillingConfig    `validate:"omitempty"`
-	S3         S3Config         `validate:"required"`
-	Cache      CacheConfig      `validate:"required"`
+	Deployment          DeploymentConfig          `validate:"required"`
+	Server              ServerConfig              `validate:"required"`
+	Auth                AuthConfig                `validate:"required"`
+	Kafka               KafkaConfig               `validate:"required"`
+	ClickHouse          ClickHouseConfig          `validate:"required"`
+	Logging             LoggingConfig             `validate:"required"`
+	Postgres            PostgresConfig            `validate:"required"`
+	Sentry              SentryConfig              `validate:"required"`
+	Event               EventConfig               `validate:"required"`
+	DynamoDB            DynamoDBConfig            `validate:"required"`
+	Temporal            TemporalConfig            `validate:"required"`
+	Webhook             Webhook                   `validate:"omitempty"`
+	Secrets             SecretsConfig             `validate:"required"`
+	Billing             BillingConfig             `validate:"omitempty"`
+	S3                  S3Config                  `validate:"required"`
+	Cache               CacheConfig               `validate:"required"`
+	EventPostProcessing EventPostProcessingConfig `mapstructure:"event_post_processing" validate:"required"`
 }
 
 type CacheConfig struct {
@@ -143,6 +144,12 @@ type BillingConfig struct {
 	EnvironmentID string `mapstructure:"environment_id" validate:"omitempty"`
 }
 
+type EventPostProcessingConfig struct {
+	// Rate limit in messages consumed per second
+	Topic     string `mapstructure:"topic" validate:"required"`
+	RateLimit int64  `mapstructure:"rate_limit" validate:"required"`
+}
+
 func NewConfig() (*Configuration, error) {
 	v := viper.New()
 
diff --git a/internal/config/config.yaml b/internal/config/config.yaml
index 770b7637c..c46088541 100644
--- a/internal/config/config.yaml
+++ b/internal/config/config.yaml
@@ -125,3 +125,7 @@ s3:
 
 cache:
   enabled: false
+
+event_post_processing:
+  topic: "events_post_processing"
+  rate_limit: 12
diff --git a/internal/domain/price/model.go b/internal/domain/price/model.go
index ede177908..67781d54d 100644
--- a/internal/domain/price/model.go
+++ b/internal/domain/price/model.go
@@ -148,7 +148,6 @@ func (p *Price) CalculateAmount(quantity decimal.Decimal) decimal.Decimal {
 
 // CalculateTierAmount performs calculation for tier price with flat and fixed ampunt
 func (pt *PriceTier) CalculateTierAmount(quantity decimal.Decimal, currency string) decimal.Decimal {
-	// Calculate tier cost with proper rounding
 	tierCost := pt.UnitAmount.Mul(quantity)
 	if pt.FlatAmount != nil {
 		tierCost = tierCost.Add(*pt.FlatAmount)
diff --git a/internal/service/event_post_processing.go b/internal/service/event_post_processing.go
index d2f0fad95..15ddd1056 100644
--- a/internal/service/event_post_processing.go
+++ b/internal/service/event_post_processing.go
@@ -12,6 +12,7 @@ import (
 	"github.com/ThreeDotsLabs/watermill/message"
 	"github.com/ThreeDotsLabs/watermill/message/router/middleware"
 	"github.com/flexprice/flexprice/internal/api/dto"
+	"github.com/flexprice/flexprice/internal/config"
 	"github.com/flexprice/flexprice/internal/domain/events"
 	"github.com/flexprice/flexprice/internal/domain/feature"
 	"github.com/flexprice/flexprice/internal/domain/meter"
@@ -25,10 +26,6 @@ import (
 	"github.com/shopspring/decimal"
 )
 
-const (
-	EventsPostProcessingTopic = "events_post_processing"
-)
-
 // PriceMatch represents a matching price and meter for an event
 type PriceMatch struct {
 	Price *price.Price
@@ -41,7 +38,7 @@ type EventPostProcessingService interface {
 	PublishEvent(ctx context.Context, event *events.Event) error
 
 	// Register message handler with the router
-	RegisterHandler(router *pubsubRouter.Router)
+	RegisterHandler(router *pubsubRouter.Router, cfg *config.Configuration)
 
 	// Get usage cost for a specific period
 	GetPeriodCost(ctx context.Context, tenantID, environmentID, customerID, subscriptionID string, periodID uint64) (decimal.Decimal, error)
@@ -116,7 +113,7 @@ func (s *eventPostProcessingService) PublishEvent(ctx context.Context, event *ev
 	)
 
 	// Publish to post-processing topic
-	if err := s.pubSub.Publish(ctx, EventsPostProcessingTopic, msg); err != nil {
+	if err := s.pubSub.Publish(ctx, s.Config.EventPostProcessing.Topic, msg); err != nil {
 		return ierr.WithError(err).
 			WithHint("Failed to publish event for post-processing").
 			Mark(ierr.ErrSystem)
@@ -126,21 +123,31 @@ func (s *eventPostProcessingService) PublishEvent(ctx context.Context, event *ev
 }
 
 // RegisterHandler registers a handler for the post-processing topic with rate limiting
-func (s *eventPostProcessingService) RegisterHandler(router *pubsubRouter.Router) {
+func (s *eventPostProcessingService) RegisterHandler(router *pubsubRouter.Router, cfg *config.Configuration) {
+	// handle config defaults
+	if cfg.EventPostProcessing.RateLimit == 0 {
+		cfg.EventPostProcessing.RateLimit = 1
+	}
+
+	if cfg.EventPostProcessing.Topic == "" {
+		cfg.EventPostProcessing.Topic = "events_post_processing"
+	}
+
 	// Add throttle middleware to this specific handler
-	throttle := middleware.NewThrottle(1, time.Second)
+	throttle := middleware.NewThrottle(cfg.EventPostProcessing.RateLimit, time.Second)
 
 	// Add the handler
 	router.AddNoPublishHandler(
 		"events_post_processing_handler",
-		EventsPostProcessingTopic,
+		cfg.EventPostProcessing.Topic,
 		s.pubSub,
 		s.processMessage,
 		throttle.Middleware,
 	)
 
 	s.Logger.Infow("registered event post-processing handler",
-		"topic", EventsPostProcessingTopic,
+		"topic", cfg.EventPostProcessing.Topic,
+		"rate_limit", cfg.EventPostProcessing.RateLimit,
 	)
 }
 
@@ -481,24 +488,7 @@ func (s *eventPostProcessingService) prepareProcessedEvents(ctx context.Context,
 			// Create a unique hash for deduplication
 			uniqueHash := s.generateUniqueHash(event, match.Meter)
 
-			// Check for duplicate events
-			// TODO: review if this is correct and also maybe just call for COUNT_UNIQUE and not all cases
-			isDuplicate, err := s.processedEventRepo.IsDuplicate(ctx, sub.ID, match.Meter.ID, periodID, uniqueHash)
-			if err != nil {
-				s.Logger.Errorw("failed to check for duplicate event",
-					"event_id", event.ID,
-					"error", err,
-				)
-				continue
-			}
-
-			if isDuplicate {
-				s.Logger.Debugw("duplicate event detected, skipping",
-					"event_id", event.ID,
-					"unique_hash", uniqueHash,
-				)
-				continue
-			}
+			// TODO: Check for duplicate events also maybe just call for COUNT_UNIQUE and not all cases
 
 			// Create a new processed event for each match
 			processedEventCopy := &events.ProcessedEvent{
@@ -565,8 +555,9 @@ func (s *eventPostProcessingService) prepareProcessedEvents(ctx context.Context,
 			processedEventCopy.TierSnapshot = tierSnapshot
 
 			// Calculate cost details using the price service
+			// since per event price can be very small, we don't round the cost
 			priceService := NewPriceService(s.PriceRepo, s.MeterRepo, s.Logger)
-			costDetails := priceService.CalculateCostWithBreakup(ctx, match.Price, billableQty)
+			costDetails := priceService.CalculateCostWithBreakup(ctx, match.Price, billableQty, false)
 
 			// Set cost details on the processed event
 			processedEventCopy.UnitCost = costDetails.EffectiveUnitCost
diff --git a/internal/service/event_post_processing_test.go b/internal/service/event_post_processing_test.go
new file mode 100644
index 000000000..6d43c3366
--- /dev/null
+++ b/internal/service/event_post_processing_test.go
@@ -0,0 +1 @@
+package service
diff --git a/internal/service/price.go b/internal/service/price.go
index 0d78b8b10..7913a4350 100644
--- a/internal/service/price.go
+++ b/internal/service/price.go
@@ -24,7 +24,7 @@ type PriceService interface {
 
 	// CalculateCostWithBreakup calculates the cost for a given price and quantity
 	// and returns detailed information about the calculation
-	CalculateCostWithBreakup(ctx context.Context, price *price.Price, quantity decimal.Decimal) dto.CostBreakup
+	CalculateCostWithBreakup(ctx context.Context, price *price.Price, quantity decimal.Decimal, round bool) dto.CostBreakup
 }
 
 type priceService struct {
@@ -245,7 +245,7 @@ func (s *priceService) calculateTieredCost(ctx context.Context, price *price.Pri
 
 		selectedTier := price.Tiers[selectedTierIndex]
 
-		// Calculate tier cost with proper rounding and handling of flat amount
+		// Calculate tier cost with full precision and handling of flat amount
 		tierCost := selectedTier.CalculateTierAmount(quantity, price.Currency)
 
 		s.logger.WithContext(ctx).Debugf(
@@ -269,7 +269,7 @@ func (s *priceService) calculateTieredCost(ctx context.Context, price *price.Pri
 				}
 			}
 
-			// Calculate tier cost with proper rounding and handling of flat amount
+			// Calculate tier cost with full precision and handling of flat amount
 			tierCost := tier.CalculateTierAmount(tierQuantity, price.Currency)
 			cost = cost.Add(tierCost)
 			remainingQuantity = remainingQuantity.Sub(tierQuantity)
@@ -295,7 +295,7 @@ func (s *priceService) calculateTieredCost(ctx context.Context, price *price.Pri
 }
 
 // CalculateCostWithBreakup calculates the cost with detailed breakdown information
-func (s *priceService) CalculateCostWithBreakup(ctx context.Context, price *price.Price, quantity decimal.Decimal) dto.CostBreakup {
+func (s *priceService) CalculateCostWithBreakup(ctx context.Context, price *price.Price, quantity decimal.Decimal, round bool) dto.CostBreakup {
 	result := dto.CostBreakup{
 		EffectiveUnitCost: decimal.Zero,
 		SelectedTierIndex: -1,
@@ -334,7 +334,10 @@ func (s *priceService) CalculateCostWithBreakup(ctx context.Context, price *pric
 		result = s.calculateTieredCostWithBreakup(ctx, price, quantity)
 	}
 
-	result.FinalCost = result.FinalCost.Round(types.GetCurrencyPrecision(price.Currency))
+	if round {
+		result.FinalCost = result.FinalCost.Round(types.GetCurrencyPrecision(price.Currency))
+	}
+
 	return result
 }
 
@@ -376,7 +379,7 @@ func (s *priceService) calculateTieredCostWithBreakup(ctx context.Context, price
 		result.SelectedTierIndex = selectedTierIndex
 		result.TierUnitAmount = selectedTier.UnitAmount
 
-		// Calculate tier cost with proper rounding and handling of flat amount
+		// Calculate tier cost with full precision and handling of flat amount
 		result.FinalCost = selectedTier.CalculateTierAmount(quantity, price.Currency)
 
 		// Calculate effective unit cost (handle zero quantity case)
@@ -405,7 +408,7 @@ func (s *priceService) calculateTieredCostWithBreakup(ctx context.Context, price
 				}
 			}
 
-			// Calculate tier cost with proper rounding and handling of flat amount
+			// Calculate tier cost with full precision and handling of flat amount
 			tierCost := tier.CalculateTierAmount(tierQuantity, price.Currency)
 			result.FinalCost = result.FinalCost.Add(tierCost)
 
diff --git a/internal/service/price_test.go b/internal/service/price_test.go
index 7d799d5bc..cdc3c90b8 100644
--- a/internal/service/price_test.go
+++ b/internal/service/price_test.go
@@ -19,8 +19,10 @@ import (
 type PriceServiceSuite struct {
 	suite.Suite
 	ctx          context.Context
-	priceService *priceService
+	priceService PriceService
 	priceRepo    *testutil.InMemoryPriceStore
+	meterRepo    *testutil.InMemoryMeterStore
+	logger       *logger.Logger
 }
 
 func TestPriceService(t *testing.T) {
@@ -30,11 +32,9 @@ func TestPriceService(t *testing.T) {
 func (s *PriceServiceSuite) SetupTest() {
 	s.ctx = testutil.SetupContext()
 	s.priceRepo = testutil.NewInMemoryPriceStore()
-
-	s.priceService = &priceService{
-		repo:   s.priceRepo,
-		logger: logger.GetLogger(),
-	}
+	s.meterRepo = testutil.NewInMemoryMeterStore()
+	s.logger = logger.GetLogger()
+	s.priceService = NewPriceService(s.priceRepo, s.meterRepo, s.logger)
 }
 
 func (s *PriceServiceSuite) TestCreatePrice() {
@@ -188,9 +188,9 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_FlatFee() {
 	}
 
 	quantity := decimal.NewFromInt(5)
-	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 
-	s.Equal(decimal.NewFromInt(500).Equal(result.FinalCost), true)
+	s.Equal(decimal.NewFromInt(500).Equal(result.FinalCost), true, "Final cost is %v", result.FinalCost)
 	s.Equal(decimal.NewFromInt(100).Equal(result.EffectiveUnitCost), true)
 	s.Equal(decimal.NewFromInt(100).Equal(result.TierUnitAmount), true)
 	s.Equal(-1, result.SelectedTierIndex)
@@ -209,7 +209,7 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_Package() {
 	}
 
 	quantity := decimal.NewFromInt(25)
-	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 
 	s.Equal(decimal.NewFromInt(150).Equal(result.FinalCost), true) // 25/10 = 2.5, rounded up to 3, 3*50 = 150
 	s.Equal(decimal.NewFromInt(50).Equal(result.EffectiveUnitCost), true)
@@ -243,7 +243,7 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_TieredVolume() {
 
 	// Test within first tier
 	quantity := decimal.NewFromInt(5)
-	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 	s.Equal(decimal.NewFromInt(250).Equal(result.FinalCost), true) // 5 * 50 = 250
 	s.Equal(decimal.NewFromInt(50).Equal(result.EffectiveUnitCost), true)
 	s.Equal(decimal.NewFromInt(50).Equal(result.TierUnitAmount), true)
@@ -251,7 +251,7 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_TieredVolume() {
 
 	// Test within second tier
 	quantity = decimal.NewFromInt(15)
-	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 	s.Equal(decimal.NewFromInt(600).Equal(result.FinalCost), true) // 15 * 40 = 600
 	s.Equal(decimal.NewFromInt(40).Equal(result.EffectiveUnitCost), true)
 	s.Equal(decimal.NewFromInt(40).Equal(result.TierUnitAmount), true)
@@ -259,7 +259,7 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_TieredVolume() {
 
 	// Test within third tier (unlimited)
 	quantity = decimal.NewFromInt(25)
-	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 	s.Equal(decimal.NewFromInt(750).Equal(result.FinalCost), true) // 25 * 30 = 750
 	s.Equal(decimal.NewFromInt(30).Equal(result.EffectiveUnitCost), true)
 	s.Equal(decimal.NewFromInt(30).Equal(result.TierUnitAmount), true)
@@ -292,14 +292,14 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_TieredSlab() {
 
 	// Test within first tier
 	quantity := decimal.NewFromInt(5)
-	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 	s.Equal(decimal.NewFromInt(250).Equal(result.FinalCost), true) // 5 * 50 = 250
 	s.Equal(decimal.NewFromInt(50).Equal(result.TierUnitAmount), true)
 	s.Equal(0, result.SelectedTierIndex)
 
 	// Test spanning first and second tiers
 	quantity = decimal.NewFromInt(15)
-	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 
 	// The implementation calculates: (10 * 50) + (5 * 40) = 500 + 200 = 700
 	expectedFinalCost := decimal.NewFromInt(700)
@@ -312,7 +312,7 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_TieredSlab() {
 
 	// Test spanning all three tiers
 	quantity = decimal.NewFromInt(25)
-	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result = s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 
 	// From the debug logs, the calculation is:
 	// (10 * 50) = 500 (first tier)
@@ -337,7 +337,7 @@ func (s *PriceServiceSuite) TestCalculateCostWithBreakup_ZeroQuantity() {
 	}
 
 	quantity := decimal.Zero
-	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity)
+	result := s.priceService.CalculateCostWithBreakup(s.ctx, price, quantity, false)
 
 	s.Equal(decimal.Zero, result.FinalCost)
 	s.Equal(decimal.Zero, result.EffectiveUnitCost)


Reviews:
user: login: ellipsis-dev[bot]
body: > [!CAUTION]
> **Changes requested  :x:**
> <details>
> <summary>Reviewed everything up to 5a006ce4686ab687a0aebe1be6670e9030002b5b in <ellipsistime>2 minutes and 30 seconds</ellipsistime>. Click for details.</summary> 
> 
> - Reviewed `181` lines of code in `4` files
> - Skipped `0` files when reviewing.
> - Skipped posting `8` draft comments. View those below.
> - Modify your [settings](https://app.ellipsis.dev/flexprice/settings/code-review) and [rules](https://app.ellipsis.dev/flexprice/code-review/rules) to customize what types of comments Ellipsis leaves. And don't forget to react with :+1: or :-1: to teach Ellipsis.
> 
> <details>
> <summary>1. <code>cmd/server/main.go:286</code></summary>
> 
> - **Draft comment:** 
> Passing the cfg parameter to startPostProcessingConsumer is clear. Ensure that all call sites now include cfg consistently.
> - **Reason this comment was not posted:**
> Comment looked like it was already resolved.
> 
> 
> </details>
> 
> <details>
> <summary>2. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> New EventPostProcessingConfig is added as required. Double-check validations and default behaviors.
> - **Reason this comment was not posted:**
> Comment did not seem useful. Confidence is useful = `0%` <= threshold `50%` This comment is asking the PR author to double-check validations and default behaviors, which violates the rule against asking the author to confirm or double-check things. It doesn't provide a specific suggestion or point out a specific issue.
> 
> 
> </details>
> 
> <details>
> <summary>3. <code>internal/config/config.yaml:129</code></summary>
> 
> - **Draft comment:** 
> Event post processing configuration defaults (topic, rate_limit) are set; confirm these are appropriate for production.
> - **Reason this comment was not posted:**
> Comment did not seem useful. Confidence is useful = `0%` <= threshold `50%` The comment is asking the author to confirm if the default settings for `topic` and `rate_limit` are appropriate for production. This falls under asking the author to confirm their intention, which is against the rules. Therefore, this comment should be removed.
> 
> 
> </details>
> 
> <details>
> <summary>4. <code>internal/service/event_post_processing.go:116</code></summary>
> 
> - **Draft comment:** 
> PublishEvent uses s.Config.EventPostProcessing.Topic. Ensure that s.Config is initialized (likely via ServiceParams) so this configuration is accessible.
> - **Reason this comment was not posted:**
> Comment did not seem useful. Confidence is useful = `0%` <= threshold `50%` The comment is suggesting to ensure that a configuration is initialized, which falls under asking the PR author to ensure something is set up correctly. This violates the rule against asking the author to ensure behavior is intended or to double-check things.
> 
> 
> </details>
> 
> <details>
> <summary>5. <code>cmd/server/main.go:287</code></summary>
> 
> - **Draft comment:** 
> Passing cfg to startPostProcessingConsumer is correct. This change allows the post‐processing consumer to be driven by config values.
> - **Reason this comment was not posted:**
> Comment did not seem useful. Confidence is useful = `0%` <= threshold `50%` This comment is purely informative and does not provide any actionable feedback or suggestions for improvement. It simply states a fact about the code change without offering any guidance or raising any concerns.
> 
> 
> </details>
> 
> <details>
> <summary>6. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> New EventPostProcessing config section looks good. Verify that defaults (topic and rate_limit) are set as desired.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>7. <code>internal/service/event_post_processing.go:41</code></summary>
> 
> - **Draft comment:** 
> Changed RegisterHandler signature to accept cfg improves configurability. Ensure that s.Config is properly initialized for use in PublishEvent.
> - **Reason this comment was not posted:**
> Comment did not seem useful. Confidence is useful = `0%` <= threshold `50%` The comment suggests ensuring that `s.Config` is properly initialized, which is a form of asking the author to double-check their work. This violates the rule against asking the author to ensure behavior is intended or tested. However, the first part of the comment is informative and does not violate any rules. Overall, the comment is not approved because it includes a request to ensure initialization.
> 
> 
> </details>
> 
> <details>
> <summary>8. <code>internal/service/event_post_processing.go:116</code></summary>
> 
> - **Draft comment:** 
> Using s.Config.EventPostProcessing.Topic in PublishEvent is appropriate; just ensure that ServiceParams correctly provides the config.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> 
> Workflow ID: <workflowid>`wflow_aQzNNWray5vH8GMA`</workflowid>
> </details>
> 
> <sup>You can customize </sup>[<img alt="Ellipsis" src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=flexprice%2Fflexprice&utm_source=github&utm_medium=referral)<sup> by changing your [verbosity settings](https://app.ellipsis.dev/flexprice/settings/code-review), reacting with :+1: or :-1:, [replying to comments](https://docs.ellipsis.dev/features/code-review#teaching-ellipsis), or adding [code review rules](https://app.ellipsis.dev/flexprice/code-review/rules).</sup>
state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-05-09T22:28:15Z
user: login: ellipsis-dev[bot]
body: > [!IMPORTANT]
> **Looks good to me!  :+1:**
> <details>
> <summary>Reviewed dd50ccbc16d74b242ee6ba37bf4ebdb26e1a7530 in <ellipsistime>47 seconds</ellipsistime>. Click for details.</summary> 
> 
> - Reviewed `13` lines of code in `1` files
> - Skipped `0` files when reviewing.
> - Skipped posting `2` draft comments. View those below.
> - Modify your [settings](https://app.ellipsis.dev/flexprice/settings/code-review) and [rules](https://app.ellipsis.dev/flexprice/code-review/rules) to customize what types of comments Ellipsis leaves. And don't forget to react with :+1: or :-1: to teach Ellipsis.
> 
> <details>
> <summary>1. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> Good change: Adding the mapstructure tag for EventPostProcessing for consistency with other fields.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>2. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> Good addition of the mapstructure tag on EventPostProcessing. This ensures the YAML key 'event_post_processing' is correctly unmarshaled. Ensure similar consistency across comparable config fields if needed.
> - **Reason this comment was not posted:**
> Comment looked like it was already resolved.
> 
> 
> </details>
> 
> 
> Workflow ID: <workflowid>`wflow_MBZmYMd8w3W0BFxT`</workflowid>
> </details>
> 
> <sup>You can customize </sup>[<img alt="Ellipsis" src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=flexprice%2Fflexprice&utm_source=github&utm_medium=referral)<sup> by changing your [verbosity settings](https://app.ellipsis.dev/flexprice/settings/code-review), reacting with :+1: or :-1:, [replying to comments](https://docs.ellipsis.dev/features/code-review#teaching-ellipsis), or adding [code review rules](https://app.ellipsis.dev/flexprice/code-review/rules).</sup>
state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-05-11T20:53:00Z
user: login: ellipsis-dev[bot]
body: > [!IMPORTANT]
> **Looks good to me!  :+1:**
> <details>
> <summary>Reviewed a7c80e1fa08c6e0ade27fa5767bdc21eb1a74cef in <ellipsistime>2 minutes and 10 seconds</ellipsistime>. Click for details.</summary> 
> 
> - Reviewed `20` lines of code in `2` files
> - Skipped `0` files when reviewing.
> - Skipped posting `4` draft comments. View those below.
> - Modify your [settings](https://app.ellipsis.dev/flexprice/settings/code-review) and [rules](https://app.ellipsis.dev/flexprice/code-review/rules) to customize what types of comments Ellipsis leaves. And don't forget to react with :+1: or :-1: to teach Ellipsis.
> 
> <details>
> <summary>1. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> Good addition of the mapstructure tag. Ensure your config files consistently use 'event_post_processing' so the value is mapped correctly.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>2. <code>internal/service/event_post_processing_test.go:1</code></summary>
> 
> - **Draft comment:** 
> Empty test file. Add tests for post-processing consumption to validate behavior.
> - **Reason this comment was not posted:**
> Decided after close inspection that this draft comment was likely wrong and/or not actionable: usefulness confidence = 20% vs. threshold = 50% This is a newly created test file that's clearly meant to contain tests but is currently empty. The comment is suggesting to add tests which would be the expected next step. However, the PR might be work in progress, or the tests might be coming in a subsequent PR. We shouldn't assume tests must be added in this PR. The file might be intentionally empty as a placeholder, or tests might be planned for a future PR. We don't have enough context about the PR's scope. While those are valid points, an empty test file provides no value and should either contain tests or not exist at all. Delete the comment. While adding tests would be good, we shouldn't assume they must be added in this PR, and the author likely knows they need to add tests.
> 
> 
> </details>
> 
> <details>
> <summary>3. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> Good change adding the mapstructure tag for the EventPostProcessing field. Ensure the corresponding YAML key is 'event_post_processing'.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>4. <code>internal/service/event_post_processing_test.go:1</code></summary>
> 
> - **Draft comment:** 
> Empty test file detected. Consider adding tests or removing the file if it's not used.
> - **Reason this comment was not posted:**
> Confidence changes required: `33%` <= threshold `50%` None
> 
> 
> </details>
> 
> 
> Workflow ID: <workflowid>`wflow_d8fEPwNmzfSX1Wa0`</workflowid>
> </details>
> 
> <sup>You can customize </sup>[<img alt="Ellipsis" src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=flexprice%2Fflexprice&utm_source=github&utm_medium=referral)<sup> by changing your [verbosity settings](https://app.ellipsis.dev/flexprice/settings/code-review), reacting with :+1: or :-1:, [replying to comments](https://docs.ellipsis.dev/features/code-review#teaching-ellipsis), or adding [code review rules](https://app.ellipsis.dev/flexprice/code-review/rules).</sup>
state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-05-11T21:05:16Z
user: login: ellipsis-dev[bot]
body: > [!IMPORTANT]
> **Looks good to me!  :+1:**
> <details>
> <summary>Reviewed b625cb6f213b5bf3aa9839e283b851eba348321f in <ellipsistime>43 seconds</ellipsistime>. Click for details.</summary> 
> 
> - Reviewed `42` lines of code in `3` files
> - Skipped `0` files when reviewing.
> - Skipped posting `6` draft comments. View those below.
> - Modify your [settings](https://app.ellipsis.dev/flexprice/settings/code-review) and [rules](https://app.ellipsis.dev/flexprice/code-review/rules) to customize what types of comments Ellipsis leaves. And don't forget to react with :+1: or :-1: to teach Ellipsis.
> 
> <details>
> <summary>1. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> Good addition of the 'mapstructure:"event_post_processing"' tag for Viper parsing. This ensures config mapping consistency.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>2. <code>internal/service/event_post_processing_test.go:1</code></summary>
> 
> - **Draft comment:** 
> Empty test file detected; consider adding tests or a TODO note.
> - **Reason this comment was not posted:**
> Confidence changes required: `50%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>3. <code>internal/service/price_test.go:185</code></summary>
> 
> - **Draft comment:** 
> Changed base amount from 500 to 100 in flat fee test; ensure this aligns with business logic: 100 * 5 = 500. Good to include a debug message in the assertion.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>4. <code>internal/config/config.go:35</code></summary>
> 
> - **Draft comment:** 
> Added mapstructure tag for EventPostProcessing; ensures proper unmarshalling from config files.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>5. <code>internal/service/event_post_processing_test.go:1</code></summary>
> 
> - **Draft comment:** 
> This test file is empty; consider adding tests or removing it if not needed.
> - **Reason this comment was not posted:**
> Confidence changes required: `33%` <= threshold `50%` None
> 
> 
> </details>
> 
> <details>
> <summary>6. <code>internal/service/price_test.go:185</code></summary>
> 
> - **Draft comment:** 
> Updated flat fee test: using base price 100 with quantity 5 correctly yields a final cost of 500; inclusion of a debug message improves failure visibility.
> - **Reason this comment was not posted:**
> Confidence changes required: `0%` <= threshold `50%` None
> 
> 
> </details>
> 
> 
> Workflow ID: <workflowid>`wflow_aEMKTQAIxOe0AHSI`</workflowid>
> </details>
> 
> <sup>You can customize </sup>[<img alt="Ellipsis" src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=flexprice%2Fflexprice&utm_source=github&utm_medium=referral)<sup> by changing your [verbosity settings](https://app.ellipsis.dev/flexprice/settings/code-review), reacting with :+1: or :-1:, [replying to comments](https://docs.ellipsis.dev/features/code-review#teaching-ellipsis), or adding [code review rules](https://app.ellipsis.dev/flexprice/code-review/rules).</sup>
state: COMMENTED
author_association: CONTRIBUTOR
submitted_at: 2025-05-11T21:06:47Z

Review comments:
diff_hunk: @@ -126,21 +123,31 @@ func (s *eventPostProcessingService) PublishEvent(ctx context.Context, event *ev
 }
 
 // RegisterHandler registers a handler for the post-processing topic with rate limiting
-func (s *eventPostProcessingService) RegisterHandler(router *pubsubRouter.Router) {
+func (s *eventPostProcessingService) RegisterHandler(router *pubsubRouter.Router, cfg *config.Configuration) {
+	// handle config defaults
path: internal/service/event_post_processing.go
user: login: ellipsis-dev[bot]
body: Consider adding inline comments explaining why defaults are set in `RegisterHandler` (e.g., rate limit zero becomes 1).
```suggestion
	// handle config defaults (e.g., rate limit 0 means unlimited, so we default to 1 to avoid disabling rate limiting entirely)
```

created_at: 2025-05-09T22:28:15Z
author_association: CONTRIBUTOR
diff_hunk: @@ -126,21 +123,31 @@ func (s *eventPostProcessingService) PublishEvent(ctx context.Context, event *ev
 }
 
 // RegisterHandler registers a handler for the post-processing topic with rate limiting
-func (s *eventPostProcessingService) RegisterHandler(router *pubsubRouter.Router) {
+func (s *eventPostProcessingService) RegisterHandler(router *pubsubRouter.Router, cfg *config.Configuration) {
+	// handle config defaults
+	if cfg.EventPostProcessing.RateLimit == 0 {
path: internal/service/event_post_processing.go
user: login: ellipsis-dev[bot]
body: Avoid mutating the injected config in `RegisterHandler` (setting defaults directly on `cfg`). It may be better to use a local copy to prevent side effects.

created_at: 2025-05-09T22:28:15Z
author_association: CONTRIBUTOR

PR comments: