sneak
27493568fd
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internal/app now provides the cache, the fetcher, the processor, the image service, the session manager and the encrypted URL generator, and handlers.New receives them built. database.New opens the database, so these parts can read it while fx builds them; the cache's stop hook still runs before the database's. Each setting's default is declared in internal/config, the default cache_max_bytes included, which internal/app works out before it builds the cache. The cache's MaxBytes is the one value for the disk cache limit, and 0 turns the disk cache off. The fetcher and the processor take explicit values. The server tests build the pipeline themselves, as they cannot import internal/app. Model: opus-5-5
88 lines
2.6 KiB
Go
88 lines
2.6 KiB
Go
package imgcache
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import (
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"errors"
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"testing"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/testutil"
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)
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// counterValues holds the values of a cache's counters.
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type counterValues struct {
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hitCount int64
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missCount int64
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upstreamFetchCount int64
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upstreamFetchBytes int64
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transformCount int64
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}
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// readCounters reads cache's counters.
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func readCounters(cache *Cache) counterValues {
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return counterValues{
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hitCount: int64(testutil.ToFloat64(cache.cacheHits)),
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missCount: int64(testutil.ToFloat64(cache.cacheMisses)),
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upstreamFetchCount: int64(testutil.ToFloat64(cache.upstreamFetches)),
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upstreamFetchBytes: int64(testutil.ToFloat64(cache.upstreamFetchBytes)),
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transformCount: int64(testutil.ToFloat64(cache.transforms)),
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}
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}
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// TestNewCache_RegistersItsCountersOnItsRegistry checks that NewCache
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// registers the cache's counters on the registry it is given, under the
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// names README.md gives them.
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func TestNewCache_RegistersItsCountersOnItsRegistry(t *testing.T) {
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t.Parallel()
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registry := prometheus.NewRegistry()
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_, err := NewCache(evictionTestDB(t),
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CacheConfig{StateDir: t.TempDir(), MaxBytes: 1 << 30}, registry)
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if err != nil {
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t.Fatalf("NewCache() error = %v", err)
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}
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names := []string{
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"pixa_cache_hits_total",
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"pixa_cache_misses_total",
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"pixa_upstream_fetches_total",
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"pixa_upstream_fetch_bytes_total",
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"pixa_transforms_total",
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}
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count, err := testutil.GatherAndCount(registry, names...)
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if err != nil {
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t.Fatalf("testutil.GatherAndCount() error = %v", err)
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}
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if count != len(names) {
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t.Errorf("%d of the counters %v are on the registry, want %d",
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count, names, len(names))
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}
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}
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// TestNewCache_FailsWhenItsCountersCannotBeRegistered makes a second cache
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// on the registry of a first. Its counters have the same names, so the
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// registry refuses them, and NewCache must return that error.
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func TestNewCache_FailsWhenItsCountersCannotBeRegistered(t *testing.T) {
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t.Parallel()
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registry := prometheus.NewRegistry()
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_, err := NewCache(evictionTestDB(t),
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CacheConfig{StateDir: t.TempDir(), MaxBytes: 1 << 30}, registry)
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if err != nil {
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t.Fatalf("NewCache() of the first cache error = %v", err)
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}
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_, err = NewCache(evictionTestDB(t),
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CacheConfig{StateDir: t.TempDir(), MaxBytes: 1 << 30}, registry)
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t.Logf("NewCache() of the second cache error = %v", err)
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var alreadyRegistered prometheus.AlreadyRegisteredError
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if !errors.As(err, &alreadyRegistered) {
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t.Errorf("NewCache() of the second cache error = %v, want %T",
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err, alreadyRegistered)
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}
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}
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