99 lines
2.6 KiB
Go
99 lines
2.6 KiB
Go
package postgres
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import (
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"context"
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"errors"
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"testing"
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"time"
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"github.com/jackc/pgx/v5/pgconn"
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)
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func TestIsTransient(t *testing.T) {
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tests := []struct {
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name string
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err error
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want bool
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}{
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{"nil", nil, false},
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{"serialization failure", &pgconn.PgError{Code: codeSerializationFailure}, true},
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{"deadlock", &pgconn.PgError{Code: codeDeadlockDetected}, true},
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{"too many connections", &pgconn.PgError{Code: codeTooManyConnections}, true},
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// A unique-violation repeats identically forever — retrying is pointless.
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{"unique violation", &pgconn.PgError{Code: "23505"}, false},
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{"syntax error", &pgconn.PgError{Code: "42601"}, false},
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{"context cancelled", context.Canceled, false},
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{"deadline exceeded", context.DeadlineExceeded, false},
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{"unknown error", errors.New("boom"), false},
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// Wrapping must not hide the cause: errors.As walks the chain.
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{"wrapped deadlock", errors2Wrap(&pgconn.PgError{Code: codeDeadlockDetected}), true},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if got := isTransient(tt.err); got != tt.want {
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t.Errorf("isTransient(%v) = %v, want %v", tt.err, got, tt.want)
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}
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})
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}
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}
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func errors2Wrap(err error) error {
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return errors.Join(errors.New("query failed"), err)
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}
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func TestWithRetrySucceedsAfterTransientFailures(t *testing.T) {
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calls := 0
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err := withRetry(context.Background(), func(context.Context) error {
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calls++
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if calls < 3 {
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return &pgconn.PgError{Code: codeSerializationFailure}
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}
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return nil
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})
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if err != nil {
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t.Fatalf("unexpected error: %v", err)
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}
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if calls != 3 {
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t.Errorf("calls = %d, want 3", calls)
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}
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}
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func TestWithRetryStopsOnPermanentError(t *testing.T) {
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permanent := &pgconn.PgError{Code: "23505"} // unique violation
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calls := 0
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err := withRetry(context.Background(), func(context.Context) error {
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calls++
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return permanent
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})
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if !errors.Is(err, permanent) {
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t.Errorf("err = %v, want the original error", err)
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}
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if calls != 1 {
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t.Errorf("calls = %d, want 1 — a permanent error must not be retried", calls)
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}
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}
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func TestWithRetryHonoursContextCancellation(t *testing.T) {
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ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
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defer cancel()
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calls := 0
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start := time.Now()
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err := withRetry(ctx, func(context.Context) error {
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calls++
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return &pgconn.PgError{Code: codeDeadlockDetected}
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})
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if err == nil {
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t.Fatal("expected an error once the context expired")
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}
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// Must abort at the deadline, not run the full 5s retry budget.
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if elapsed := time.Since(start); elapsed > time.Second {
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t.Errorf("took %v, expected to stop at the context deadline", elapsed)
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}
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}
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