67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
package client
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import (
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"context"
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"encoding/json"
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"fmt"
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"hash/fnv"
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"time"
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"github.com/micro/go-micro/v3/metadata"
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cache "github.com/patrickmn/go-cache"
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)
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// NewCache returns an initialised cache.
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func NewCache() *Cache {
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return &Cache{
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cache: cache.New(cache.NoExpiration, 30*time.Second),
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}
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}
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// Cache for responses
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type Cache struct {
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cache *cache.Cache
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}
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// Get a response from the cache
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func (c *Cache) Get(ctx context.Context, req Request) (interface{}, bool) {
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return c.cache.Get(key(ctx, req))
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}
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// Set a response in the cache
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func (c *Cache) Set(ctx context.Context, req Request, rsp interface{}, expiry time.Duration) {
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c.cache.Set(key(ctx, req), rsp, expiry)
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}
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// List the key value pairs in the cache
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func (c *Cache) List() map[string]string {
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items := c.cache.Items()
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rsp := make(map[string]string, len(items))
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for k, v := range items {
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bytes, _ := json.Marshal(v.Object)
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rsp[k] = string(bytes)
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}
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return rsp
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}
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// key returns a hash for the context and request
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func key(ctx context.Context, req Request) string {
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ns, _ := metadata.Get(ctx, "Micro-Namespace")
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bytes, _ := json.Marshal(map[string]interface{}{
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"namespace": ns,
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"request": map[string]interface{}{
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"service": req.Service(),
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"endpoint": req.Endpoint(),
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"method": req.Method(),
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"body": req.Body(),
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},
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})
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h := fnv.New64()
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h.Write(bytes)
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return fmt.Sprintf("%x", h.Sum(nil))
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}
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