feat: backend service

gateway/internal/session/memory.go

@@ -1,88 +0,0 @@
-package session
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"strings"
-	"sync"
-)
-
-// MemoryCache stores session record snapshots in process-local memory. It is
-// intended for the authenticated gateway hot path and deliberately keeps no
-// TTL or size-based eviction policy.
-type MemoryCache struct {
-	mu      sync.RWMutex
-	records map[string]Record
-}
-
-// NewMemoryCache constructs an empty process-local session snapshot store.
-func NewMemoryCache() *MemoryCache {
-	return &MemoryCache{
-		records: make(map[string]Record),
-	}
-}
-
-// Lookup resolves deviceSessionID from the process-local snapshot map.
-func (c *MemoryCache) Lookup(ctx context.Context, deviceSessionID string) (Record, error) {
-	if c == nil {
-		return Record{}, errors.New("lookup session from in-memory cache: nil cache")
-	}
-	if ctx == nil || fmt.Sprint(ctx) == "context.TODO" {
-		return Record{}, errors.New("lookup session from in-memory cache: nil context")
-	}
-	if strings.TrimSpace(deviceSessionID) == "" {
-		return Record{}, errors.New("lookup session from in-memory cache: empty device session id")
-	}
-
-	c.mu.RLock()
-	record, ok := c.records[deviceSessionID]
-	c.mu.RUnlock()
-	if !ok {
-		return Record{}, fmt.Errorf("lookup session from in-memory cache: %w", ErrNotFound)
-	}
-
-	return cloneRecord(record), nil
-}
-
-// Upsert stores record in the process-local snapshot map after validating the
-// same session invariants expected from the Redis-backed cache.
-func (c *MemoryCache) Upsert(record Record) error {
-	if c == nil {
-		return errors.New("upsert session into in-memory cache: nil cache")
-	}
-	if err := validateRecord(record.DeviceSessionID, record); err != nil {
-		return fmt.Errorf("upsert session into in-memory cache: %w", err)
-	}
-
-	cloned := cloneRecord(record)
-
-	c.mu.Lock()
-	c.records[record.DeviceSessionID] = cloned
-	c.mu.Unlock()
-
-	return nil
-}
-
-// Delete removes the local snapshot for deviceSessionID when one exists.
-func (c *MemoryCache) Delete(deviceSessionID string) {
-	if c == nil || strings.TrimSpace(deviceSessionID) == "" {
-		return
-	}
-
-	c.mu.Lock()
-	delete(c.records, deviceSessionID)
-	c.mu.Unlock()
-}
-
-func cloneRecord(record Record) Record {
-	cloned := record
-	if record.RevokedAtMS != nil {
-		value := *record.RevokedAtMS
-		cloned.RevokedAtMS = &value
-	}
-
-	return cloned
-}
-
-var _ SnapshotStore = (*MemoryCache)(nil)