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package hexaicli
import (
"context"
"crypto/sha256"
"encoding/hex"
"encoding/json"
"os"
"path/filepath"
"time"
"codeberg.org/snonux/hexai/internal/llm"
"codeberg.org/snonux/hexai/internal/stats"
)
const cliResponseCacheTTL = 24 * time.Hour
// responseCache carries the injectable dependencies for the on-disk CLI
// response cache. The only dependency is the clock used to stamp entries and
// decide expiry. Production code uses defaultResponseCache (backed by
// time.Now); tests construct a responseCache with a fake clock to exercise TTL
// expiry without sleeping.
type responseCache struct {
now func() time.Time
}
// defaultResponseCache is the production cache used by the package-level
// lookup/store wrappers. It reads the real wall clock.
var defaultResponseCache = responseCache{now: time.Now}
// cacheNowContextKey carries an injected clock through the request context so
// the cache TTL logic can be driven deterministically (e.g. in tests) without
// mutating package state.
type cacheNowContextKey struct{}
// withCLIResponseCacheNow returns a context carrying now as the clock the CLI
// response cache should use for stamping and expiring entries.
func withCLIResponseCacheNow(ctx context.Context, now func() time.Time) context.Context {
return context.WithValue(ctx, cacheNowContextKey{}, now)
}
// responseCacheFromContext builds a responseCache using the clock injected via
// withCLIResponseCacheNow, falling back to the real wall clock.
func responseCacheFromContext(ctx context.Context) responseCache {
if now, ok := ctx.Value(cacheNowContextKey{}).(func() time.Time); ok && now != nil {
return responseCache{now: now}
}
return defaultResponseCache
}
type cliResponseCacheKey struct {
Provider string `json:"provider"`
Model string `json:"model"`
Messages []llm.Message `json:"messages"`
MaxTokens int `json:"max_tokens,omitempty"`
Temperature *float64 `json:"temperature,omitempty"`
}
type cliResponseCacheEntry struct {
CreatedAt time.Time `json:"created_at"`
Output string `json:"output"`
}
func newCLIResponseCacheKey(provider, model string, req requestArgs, msgs []llm.Message) cliResponseCacheKey {
return cliResponseCacheKey{
Provider: provider,
Model: model,
Messages: cloneCLIMessages(msgs),
MaxTokens: req.maxTokens,
Temperature: cloneCLITemperature(req.temperature),
}
}
// lookupCLIResponseCache reads a cached response using the clock injected into
// ctx (defaulting to the real wall clock).
func lookupCLIResponseCache(ctx context.Context, key cliResponseCacheKey) (string, time.Duration, bool) {
return responseCacheFromContext(ctx).lookup(key)
}
// storeCLIResponseCache writes a cached response using the clock injected into
// ctx (defaulting to the real wall clock).
func storeCLIResponseCache(ctx context.Context, key cliResponseCacheKey, output string) {
responseCacheFromContext(ctx).store(key, output)
}
// lookup returns the cached output for key, its age, and whether it is a valid
// (non-expired) hit. Expired entries are removed.
func (c responseCache) lookup(key cliResponseCacheKey) (string, time.Duration, bool) {
path, ok := cliResponseCachePath(key)
if !ok {
return "", 0, false
}
entry, ok := loadCLIResponseCacheEntry(path)
if !ok {
return "", 0, false
}
age := c.now().Sub(entry.CreatedAt)
if age > cliResponseCacheTTL {
_ = os.Remove(path)
return "", 0, false
}
return entry.Output, age, true
}
// store persists output for key, stamping it with the injected clock.
func (c responseCache) store(key cliResponseCacheKey, output string) {
path, ok := cliResponseCachePath(key)
if !ok {
return
}
if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
return
}
entry := cliResponseCacheEntry{CreatedAt: c.now().UTC(), Output: output}
data, err := json.Marshal(entry)
if err != nil {
return
}
_ = os.WriteFile(path, data, 0o600)
}
func cliResponseCachePath(key cliResponseCacheKey) (string, bool) {
dir, err := stats.CacheDir()
if err != nil {
return "", false
}
fingerprint, ok := cliResponseCacheFingerprint(key)
if !ok {
return "", false
}
return filepath.Join(dir, "cli-responses", fingerprint+".json"), true
}
func cliResponseCacheFingerprint(key cliResponseCacheKey) (string, bool) {
data, err := json.Marshal(key)
if err != nil {
return "", false
}
sum := sha256.Sum256(data)
return hex.EncodeToString(sum[:]), true
}
func loadCLIResponseCacheEntry(path string) (cliResponseCacheEntry, bool) {
data, err := os.ReadFile(path)
if err != nil {
return cliResponseCacheEntry{}, false
}
var entry cliResponseCacheEntry
if err := json.Unmarshal(data, &entry); err != nil {
_ = os.Remove(path)
return cliResponseCacheEntry{}, false
}
return entry, true
}
func cloneCLIMessages(msgs []llm.Message) []llm.Message {
out := make([]llm.Message, len(msgs))
copy(out, msgs)
return out
}
func cloneCLITemperature(temp *float64) *float64 {
if temp == nil {
return nil
}
value := *temp
return &value
}
|
