239 lines
9.7 KiB
Go
239 lines
9.7 KiB
Go
package mysql
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import (
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"context"
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"database/sql"
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"errors"
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"time"
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)
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const operationalMetricSampleLimit = 10000
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const operationalMetricEventWindow = 5 * time.Minute
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// OperationalSnapshot 是进程观测使用的有限数据库快照。
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// Counts 只包含固定状态的有界计数；达到上限时 Truncated 为 true，不能解释为精确总量。
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type OperationalSnapshot struct {
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// TaskStates 是 Pulse 任务按状态的有界计数。
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TaskStates map[string]uint64
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// TaskOldestAgeSeconds 是运行中任务中最早 available_at 的年龄。
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TaskOldestAgeSeconds float64
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// DeliveryStates 是结果交付按状态的有界计数。
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DeliveryStates map[string]uint64
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// DeliveryOldestAgeSeconds 是待处理交付中最早 available_at 的年龄。
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DeliveryOldestAgeSeconds float64
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// WorkflowStates 是 Weave 实例按状态的有界计数。
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WorkflowStates map[string]uint64
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// WorkflowOldestAgeSeconds 是未终结流程中最早 updated_at 的年龄。
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WorkflowOldestAgeSeconds float64
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// InboxStates 是 Weave 内部事件按状态的有界计数。
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InboxStates map[string]uint64
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// InboxOldestAgeSeconds 是待消费内部事件中最早 available_at 的年龄。
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InboxOldestAgeSeconds float64
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// Truncated 表示至少一个状态达到有界采样上限。
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Truncated bool
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// RecentEvents 是固定事件类别在最近窗口内的有界数量。
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RecentEvents map[string]uint64
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// TaskTerminalLatencySeconds 是最近窗口终态任务从创建到完成的平均耗时样本。
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TaskTerminalLatencySeconds float64
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// TaskTerminalLatencyMaxSeconds 是最近窗口终态任务样本的最大耗时。
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TaskTerminalLatencyMaxSeconds float64
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// WorkflowTerminalLatencySeconds 是最近窗口终态流程从创建到完成的平均耗时样本。
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WorkflowTerminalLatencySeconds float64
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// WorkflowTerminalLatencyMaxSeconds 是最近窗口终态流程样本的最大耗时。
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WorkflowTerminalLatencyMaxSeconds float64
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}
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var (
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operationalTaskStates = []string{"WAITING", "LEASED", "RUNNING", "NEEDS_REVIEW", "SUCCEEDED", "FAILED", "CANCELLED"}
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operationalDeliveryStates = []string{"PENDING", "LEASED", "ACKED", "EXPIRED"}
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operationalWorkflowStates = []string{"RUNNING", "WAITING", "CANCELLING", "NEEDS_REVIEW", "SUCCEEDED", "FAILED", "CANCELLED"}
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operationalInboxStates = []string{"PENDING", "LEASED", "PROCESSED", "QUARANTINED"}
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operationalEventTypes = []string{"task.accepted", "task.started", "task.succeeded", "task.failed", "task.needs_review", "task.requeued", "workflow.started", "workflow.advanced", "workflow.recovered", "workflow.blocked", "workflow.stopped"}
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)
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// ReadOperationalSnapshot performs only bounded, indexed reads. It is intended
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// for a background sampler with a short context deadline, never for a request.
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func ReadOperationalSnapshot(ctx context.Context, db *sql.DB) (OperationalSnapshot, error) {
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if db == nil {
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return OperationalSnapshot{}, errors.New("database is required")
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}
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now, err := readDatabaseNow(ctx, db)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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tasks, taskTruncated, err := boundedStateCounts(ctx, db, "pulse_tasks", "ix_task_observe_state_available", operationalTaskStates)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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deliveries, deliveryTruncated, err := boundedStateCounts(ctx, db, "orbit_deliveries", "ix_delivery_observe_state_available", operationalDeliveryStates)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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workflows, workflowTruncated, err := boundedStateCounts(ctx, db, "weave_instances", "ix_workflow_observe_state_updated", operationalWorkflowStates)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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inbox, inboxTruncated, err := boundedStateCounts(ctx, db, "weave_inbox", "ix_inbox_due", operationalInboxStates)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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taskAge, err := oldestAge(ctx, db, "pulse_tasks", "ix_task_observe_state_available", []string{"WAITING", "LEASED", "RUNNING", "NEEDS_REVIEW"}, "available_at", now)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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inboxAge, err := oldestAge(ctx, db, "weave_inbox", "ix_inbox_due", []string{"PENDING", "LEASED"}, "available_at", now)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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deliveryAge, err := oldestAge(ctx, db, "orbit_deliveries", "ix_delivery_observe_state_available", []string{"PENDING", "LEASED"}, "available_at", now)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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workflowAge, err := oldestAge(ctx, db, "weave_instances", "ix_workflow_observe_state_updated", []string{"RUNNING", "WAITING", "CANCELLING", "NEEDS_REVIEW"}, "updated_at", now)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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events, eventTruncated, err := boundedRecentEventCounts(ctx, db, now)
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if err != nil {
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return OperationalSnapshot{}, err
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}
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taskLatency, err := sampledTerminalLatency(ctx, db, "pulse_tasks", "ix_task_observe_terminal_completed", []string{"SUCCEEDED", "FAILED", "CANCELLED"}, now.Add(-operationalMetricEventWindow))
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if err != nil {
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return OperationalSnapshot{}, err
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}
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workflowLatency, err := sampledTerminalLatency(ctx, db, "weave_instances", "ix_workflow_observe_terminal_completed", []string{"SUCCEEDED", "FAILED", "CANCELLED"}, now.Add(-operationalMetricEventWindow))
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if err != nil {
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return OperationalSnapshot{}, err
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}
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return OperationalSnapshot{
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TaskStates: tasks, TaskOldestAgeSeconds: taskAge,
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DeliveryStates: deliveries, DeliveryOldestAgeSeconds: deliveryAge,
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WorkflowStates: workflows, WorkflowOldestAgeSeconds: workflowAge,
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InboxStates: inbox, InboxOldestAgeSeconds: inboxAge,
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RecentEvents: events,
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TaskTerminalLatencySeconds: taskLatency.average, TaskTerminalLatencyMaxSeconds: taskLatency.maximum,
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WorkflowTerminalLatencySeconds: workflowLatency.average, WorkflowTerminalLatencyMaxSeconds: workflowLatency.maximum,
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Truncated: taskTruncated || deliveryTruncated || workflowTruncated || inboxTruncated || eventTruncated || taskLatency.truncated || workflowLatency.truncated,
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}, nil
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}
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func readDatabaseNow(ctx context.Context, db *sql.DB) (time.Time, error) {
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var now time.Time
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if err := db.QueryRowContext(ctx, "SELECT UTC_TIMESTAMP(6)").Scan(&now); err != nil {
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return time.Time{}, err
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}
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return now.UTC(), nil
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}
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func boundedStateCounts(ctx context.Context, db *sql.DB, table, index string, states []string) (map[string]uint64, bool, error) {
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counts := make(map[string]uint64, len(states))
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truncated := false
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for _, state := range states {
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query := "SELECT COUNT(*) FROM (SELECT id FROM " + table + " FORCE INDEX (" + index + ") WHERE state=? LIMIT ?) AS bounded"
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var n uint64
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if err := db.QueryRowContext(ctx, query, state, operationalMetricSampleLimit+1).Scan(&n); err != nil {
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return nil, false, err
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}
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if n > operationalMetricSampleLimit {
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n = operationalMetricSampleLimit
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truncated = true
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}
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counts[state] = n
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}
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return counts, truncated, nil
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}
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func boundedRecentEventCounts(ctx context.Context, db *sql.DB, now time.Time) (map[string]uint64, bool, error) {
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counts := make(map[string]uint64, len(operationalEventTypes))
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truncated := false
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cutoff := now.Add(-operationalMetricEventWindow)
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for _, eventType := range operationalEventTypes {
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query := "SELECT COUNT(*) FROM (SELECT id FROM orbit_events FORCE INDEX (ix_event_observe_type_occurred) WHERE type=? AND occurred_at>=? LIMIT ?) AS bounded"
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var n uint64
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if err := db.QueryRowContext(ctx, query, eventType, cutoff, operationalMetricSampleLimit+1).Scan(&n); err != nil {
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return nil, false, err
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}
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if n > operationalMetricSampleLimit {
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n = operationalMetricSampleLimit
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truncated = true
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}
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counts[eventType] = n
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}
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return counts, truncated, nil
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}
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type terminalLatencySample struct {
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average float64
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maximum float64
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truncated bool
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}
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func sampledTerminalLatency(ctx context.Context, db *sql.DB, table, index string, states []string, cutoff time.Time) (terminalLatencySample, error) {
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placeholders := "?"
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args := make([]any, 0, len(states)+2)
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args = append(args, states[0])
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for _, state := range states[1:] {
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placeholders += ",?"
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args = append(args, state)
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}
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args = append(args, cutoff, operationalMetricSampleLimit+1)
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query := "SELECT created_at,completed_at FROM " + table + " FORCE INDEX (" + index + ") WHERE state IN (" + placeholders + ") AND completed_at>=? ORDER BY completed_at,id LIMIT ?"
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rows, err := db.QueryContext(ctx, query, args...)
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if err != nil {
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return terminalLatencySample{}, err
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}
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defer rows.Close()
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var total, maximum float64
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var read, valid int
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for rows.Next() {
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read++
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if read > operationalMetricSampleLimit {
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continue
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}
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var created, completed time.Time
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if err := rows.Scan(&created, &completed); err != nil {
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return terminalLatencySample{}, err
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}
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seconds := completed.Sub(created).Seconds()
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if seconds < 0 {
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seconds = 0
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}
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total += seconds
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if seconds > maximum {
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maximum = seconds
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}
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valid++
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}
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if err := rows.Err(); err != nil {
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return terminalLatencySample{}, err
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}
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result := terminalLatencySample{maximum: maximum, truncated: read > operationalMetricSampleLimit}
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if valid > 0 {
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result.average = total / float64(valid)
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}
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return result, nil
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}
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func oldestAge(ctx context.Context, db *sql.DB, table, index string, states []string, column string, now time.Time) (float64, error) {
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placeholders := "?"
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args := make([]any, 0, len(states))
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args = append(args, states[0])
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for _, state := range states[1:] {
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placeholders += ",?"
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args = append(args, state)
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}
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query := "SELECT " + column + " FROM " + table + " FORCE INDEX (" + index + ") WHERE state IN (" + placeholders + ") ORDER BY " + column + ",id LIMIT 1"
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var occurred time.Time
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if err := db.QueryRowContext(ctx, query, args...).Scan(&occurred); err != nil {
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if err == sql.ErrNoRows {
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return 0, nil
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}
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return 0, err
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}
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age := now.Sub(occurred.UTC()).Seconds()
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if age < 0 {
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return 0, nil
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}
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return age, nil
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}
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