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The five counts the cache_stats table held are now Prometheus counters in memory, as fields of the cache. NewCache makes them and registers them on the registry it is given. pixad gives it Prometheus' default registry, which /metrics serves; each test gives it a new one. The Increment methods add to their cache's counters, so counting makes no database call. cache_stats, Cache.Stats, Service.Stats, CacheStats and the pending counts are gone, with their tests. The background goroutine now writes only access times, and its names say so: StartPendingAccessTimeWrites, StopPendingAccessTimeWrites and pendingaccesstimes.go. The two stop tests whose write under way was a count now use access times. Model: opus-5-5
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
// Package imgcache provides interfaces and types for the image caching proxy.
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package imgcache
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import (
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"context"
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"io"
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"time"
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"sneak.berlin/go/pixa/internal/imagerequest"
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)
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// ImageResponse represents a processed image ready to serve
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type ImageResponse struct {
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// Content is the image data reader
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Content io.ReadCloser
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// ContentLength is the size in bytes (-1 if unknown)
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ContentLength int64
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// ContentType is the MIME type of the response
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ContentType string
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// ETag is the entity tag for caching
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ETag string
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// LastModified is when the content was last modified
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LastModified time.Time
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// CacheStatus indicates HIT, MISS, or STALE
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CacheStatus CacheStatus
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// FetchedBytes is the number of bytes fetched from upstream (0 if cache hit)
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FetchedBytes int64
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}
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// CacheStatus indicates whether the response was served from cache.
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type CacheStatus string
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// Cache status values for response headers.
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const (
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CacheHit CacheStatus = "HIT"
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CacheMiss CacheStatus = "MISS"
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CacheStale CacheStatus = "STALE"
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)
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// ImageCache is the main interface for the image caching proxy
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type ImageCache interface {
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// Get retrieves a processed image, fetching and processing if necessary
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Get(ctx context.Context, req *imagerequest.Request) (*ImageResponse, error)
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// Warm pre-fetches and caches an image without returning it
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Warm(ctx context.Context, req *imagerequest.Request) error
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}
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