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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| package cache | ||
|
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| import ( | ||
| "errors" | ||
|
|
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| "github.com/dgraph-io/ristretto" | ||
| ) | ||
|
|
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| var ErrParsing = errors.New("parsing error") | ||
|
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| type Config struct { | ||
| NumCounters int64 `yaml:"num_counters" mapstructure:"num_counters" default:"10000000"` | ||
| MaxCost int64 `yaml:"max_cost" mapstructure:"max_cost" default:"1073741824"` | ||
| BufferItems int64 `yaml:"buffer_items" mapstructure:"buffer_items" default:"64"` | ||
| Metrics bool `yaml:"metrics" mapstructure:"metrics" default:"true"` | ||
| TTLInSeconds int `yaml:"ttl_in_seconds" mapstructure:"ttl_in_seconds" default:"3600"` | ||
| } | ||
|
|
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| type Cache struct { | ||
| *ristretto.Cache | ||
| config Config | ||
| } | ||
|
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| func NewCache(config Config) (Cache, error) { | ||
| cache, err := ristretto.NewCache(&ristretto.Config{ | ||
| NumCounters: config.NumCounters, | ||
| MaxCost: config.MaxCost, | ||
| BufferItems: config.MaxCost, | ||
| Metrics: config.Metrics, | ||
| }) | ||
| if err != nil { | ||
| return Cache{}, err | ||
| } | ||
|
|
||
| return Cache{ | ||
| Cache: cache, | ||
| config: config, | ||
| }, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package cache | ||
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "time" | ||
|
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| "github.com/goto/shield/core/group" | ||
| ) | ||
|
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| var keyPrefix = "group" | ||
|
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| type GroupRepository interface { | ||
| GetBySlug(ctx context.Context, slug string) (group.Group, error) | ||
| } | ||
|
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| type CachedGroupRepository struct { | ||
| cache Cache | ||
| repository GroupRepository | ||
| } | ||
|
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| func NewCachedGroupRepository(cache Cache, repository GroupRepository) *CachedGroupRepository { | ||
| return &CachedGroupRepository{ | ||
| cache: cache, | ||
| repository: repository, | ||
| } | ||
| } | ||
|
|
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| func getKey(identifier string) string { | ||
| return fmt.Sprintf("%s:%s", keyPrefix, identifier) | ||
| } | ||
|
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| func (r CachedGroupRepository) GetBySlug(ctx context.Context, slug string) (group.Group, error) { | ||
| key := getKey(slug) | ||
| grp, found := r.cache.Get(key) | ||
| if !found { | ||
| grp, err := r.repository.GetBySlug(ctx, slug) | ||
| if err != nil { | ||
| return group.Group{}, err | ||
| } | ||
|
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| r.cache.SetWithTTL(key, grp, 0, time.Duration(r.cache.config.TTLInSeconds)*time.Second) | ||
| return grp, nil | ||
| } | ||
|
|
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| grpParsed, ok := grp.(group.Group) | ||
| if !ok { | ||
| return group.Group{}, ErrParsing | ||
| } | ||
|
|
||
| return grpParsed, nil | ||
| } |
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