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GORM adds deleted_at IS NULL to these queries, and SQLite, which has no table statistics here, preferred the deleted_at index to the new single-column ones wherever a column is matched against several values or compared with <. The event log's attempt load, retention's lookups of expired events and their deliveries, and the queue-depth sampler still read every live row. Each index now also covers deleted_at, first in the events index because created_at is compared with <; events keeps its created_at index for retention's final delete. A test checks SQLite's plan for each statement as GORM builds it. Model: opus-5-5
53 lines
1.8 KiB
Go
53 lines
1.8 KiB
Go
package database
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import "gorm.io/gorm"
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// DeliveryStatus represents the status of a delivery
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type DeliveryStatus string
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// Delivery status values.
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const (
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DeliveryStatusPending DeliveryStatus = "pending"
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DeliveryStatusDelivered DeliveryStatus = "delivered"
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DeliveryStatusFailed DeliveryStatus = "failed"
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DeliveryStatusRetrying DeliveryStatus = "retrying"
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)
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// Terminal reports whether a delivery in this status has finished, so
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// the delivery engine will make no further attempt of its own.
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//
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// It is what decides which deliveries the event log offers to replay:
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// a pending or retrying delivery is still the engine's, and replaying
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// one would race it.
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func (s DeliveryStatus) Terminal() bool {
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switch s {
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case DeliveryStatusDelivered, DeliveryStatusFailed:
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return true
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case DeliveryStatusPending, DeliveryStatusRetrying:
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return false
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default:
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return false
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}
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}
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// Delivery represents a delivery attempt for an event to a target
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//
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//nolint:lll // a struct tag cannot wrap
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type Delivery struct {
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BaseModel
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EventID string `gorm:"type:uuid;not null;index:idx_deliveries_event_id,priority:1" json:"eventId"`
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TargetID string `gorm:"type:uuid;not null" json:"targetId"`
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Status DeliveryStatus `gorm:"not null;default:'pending';index:idx_deliveries_status,priority:1" json:"status"`
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// DeletedAt repeats the BaseModel field only to be the second column
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// of the event_id and status indexes, for the reason DeliveryResult
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// gives.
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DeletedAt gorm.DeletedAt `gorm:"index:idx_deliveries_event_id,priority:2;index:idx_deliveries_status,priority:2" json:"deletedAt,omitzero"`
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// Relations
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Event Event `json:"event,omitzero"`
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Target Target `json:"target,omitzero"`
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DeliveryResults []DeliveryResult `json:"deliveryResults,omitempty"`
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}
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