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Merge pull request #1 from purwandi/feat/lru-cache-in-memory-store
implement lru backed repository
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,156 @@ | ||
| package repository | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "sort" | ||
| "time" | ||
|
|
||
| lru "github.com/hashicorp/golang-lru" | ||
| "github.com/purwandi/mail" | ||
| "github.com/purwandi/mail/domain" | ||
| "github.com/segmentio/ksuid" | ||
| "go.uber.org/zap" | ||
| ) | ||
|
|
||
| type lruCache struct { | ||
| cache *lru.Cache | ||
| } | ||
|
|
||
| func evictionFn(logger *zap.Logger) func(key interface{}, value interface{}) { | ||
| return func(key interface{}, value interface{}) { | ||
| m, ok := value.(domain.Message) | ||
| if !ok { | ||
| return | ||
| } | ||
| for _, att := range m.Attachments { | ||
| fullPath := fmt.Sprintf("%s/%s", mail.AssetFilePath, att.Filepath) | ||
| err := os.Remove(fullPath) | ||
| if err != nil { | ||
| msg := fmt.Sprintf("failed deleting file: %s from message id: %s", fullPath, key) | ||
| logger.Error(msg, zap.Error(err)) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| } | ||
|
|
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| func NewLRUCacheStore(size int, logger *zap.Logger) (MessageRepository, error) { | ||
| c, err := lru.NewWithEvict(size, evictionFn(logger)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| m1 := ksuid.New().String() | ||
| m2 := ksuid.New().String() | ||
| c.Add(m1, domain.Message{ | ||
| ID: m1, | ||
| Subject: "7 Quotes by Albert Einstein That Will Change How You Think ", | ||
| Sender: "[email protected]", | ||
| From: []domain.Contact{ | ||
| {Email: "[email protected]", Name: "Medium"}, | ||
| }, | ||
| To: []domain.Contact{ | ||
| {Email: "[email protected]", Name: "Fooabar"}, | ||
| }, | ||
| TextBody: "We’ve almost made it to 2021. Have you built any particularly cool projects this year? We’d love to hear about them.", | ||
| HTMLBody: "<p>hello world</p>", | ||
| Attachments: []domain.Attachment{ | ||
| {ID: "1lNigjr8fsntbweehfBLpkQRoMh", Filename: "attachment.txt", Filepath: "1lNigjr8fsntbweehfBLpkQRoMh.txt"}, | ||
| {ID: "1lNip3BucJnkDGo2uAChhgib20T", Filename: "attachment.png", Filepath: "1lNip3BucJnkDGo2uAChhgib20T.png"}, | ||
| }, | ||
| Date: time.Now().Add(-20 * time.Minute), | ||
| }) | ||
| c.Add(m2, domain.Message{ | ||
| ID: m2, | ||
| Subject: "Change How You Think | Sinem Günel in Age of Awareness", | ||
| Sender: "[email protected]", | ||
| From: []domain.Contact{ | ||
| {Email: "[email protected]", Name: "google"}, | ||
| }, | ||
| To: []domain.Contact{ | ||
| {Email: "[email protected]", Name: "Foobar"}, | ||
| }, | ||
| TextBody: "Collaborating with multiple people can be difficult, especially with lots of back and forth across email and chat.", | ||
| HTMLBody: "<p>hello world</p>", | ||
| Attachments: []domain.Attachment{ | ||
| {ID: "1lOs2EOqStjiMlDINR44KnMV9De", Filename: "attachment.txt", Filepath: "1lOs2EOqStjiMlDINR44KnMV9D.txt"}, | ||
| {ID: "1lOs60waIw6LoEqWNPmL7LRR06M", Filename: "attachment.png", Filepath: "1lOs60waIw6LoEqWNPmL7LRR06M.png"}, | ||
| }, | ||
| Date: time.Now(), | ||
| }) | ||
| return &lruCache{ | ||
| cache: c, | ||
| }, nil | ||
| } | ||
|
|
||
| func (c *lruCache) Save(ctx context.Context, m *domain.Message) <-chan error { | ||
| ch := make(chan error) | ||
| go func() { | ||
| c.cache.Add(m.ID, *m) | ||
| ch <- nil | ||
| close(ch) | ||
| }() | ||
|
|
||
| return ch | ||
| } | ||
| func (c *lruCache) Delete(ctx context.Context, id string) <-chan error { | ||
| ch := make(chan error) | ||
| go func() { | ||
| present := c.cache.Remove(id) | ||
| if present { | ||
| ch <- nil | ||
| close(ch) | ||
| return | ||
| } | ||
| ch <- errors.New("Message not found") | ||
| close(ch) | ||
| }() | ||
|
|
||
| return ch | ||
| } | ||
| func (c *lruCache) Reset(ctx context.Context) <-chan error { | ||
| ch := make(chan error) | ||
| go func() { | ||
| c.cache.Purge() | ||
| ch <- nil | ||
| close(ch) | ||
| }() | ||
|
|
||
| return ch | ||
| } | ||
| func (c *lruCache) Find(ctx context.Context, id string) <-chan QueryResult { | ||
| ch := make(chan QueryResult) | ||
| go func() { | ||
| var qr QueryResult | ||
| inf, ok := c.cache.Get(id) | ||
| if !ok { | ||
| qr.Error = errors.New("Message not found") | ||
| ch <- qr | ||
| return | ||
| } | ||
| qr.Result = inf | ||
| ch <- qr | ||
| close(ch) | ||
| }() | ||
| return ch | ||
| } | ||
| func (c *lruCache) FindAll(context.Context) <-chan QueryResult { | ||
| ch := make(chan QueryResult) | ||
| go func() { | ||
| var ( | ||
| qr QueryResult | ||
| msgs []domain.Message | ||
| ) | ||
| for _, k := range c.cache.Keys() { | ||
| inf, _ := c.cache.Get(k) | ||
| msgs = append(msgs, inf.(domain.Message)) | ||
| } | ||
| sort.Sort(ByDateDesc(msgs)) | ||
| qr.Result = msgs | ||
| ch <- qr | ||
| close(ch) | ||
| }() | ||
| return ch | ||
| } |