convert abi_cache into a proper package.

abi_cache/cache.go

@@ -0,0 +1,42 @@
+
+package abi_cache
+
+import (
+    "time"
+    "context"
+    redis_cache "github.com/go-redis/cache/v8"
+    eos "github.com/eoscanada/eos-go"
+)
+
+type Cache struct {
+    c *redis_cache.Cache
+    ctx context.Context
+    prefix string
+}
+
+func New(prefix string, options *redis_cache.Options) (*Cache) {
+    return &Cache{
+        c: redis_cache.New(options),
+        ctx: context.Background(),
+        prefix: prefix,
+    }
+}
+
+func (this *Cache) Get(account string) (*eos.ABI, error) {
+    var v eos.ABI
+    err := this.c.Get(this.ctx, this.key(account), &v);
+    return &v, err
+}
+
+func (this *Cache) Set(account string, abi *eos.ABI, ttl time.Duration) error {
+    return this.c.Set(&redis_cache.Item{
+        Ctx:   this.ctx,
+        Key:   this.key(account),
+        Value: *abi,
+        TTL:   ttl,
+    })
+}
+
+func (this *Cache) key(account string) (string) {
+    return this.prefix + "." + account
+}