79 lines
1.7 KiB
Go
79 lines
1.7 KiB
Go
package rpc
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import (
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"github.com/mitchellh/packer/packer"
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"log"
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"net/rpc"
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)
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// An implementation of packer.Cache where the cache is actually executed
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// over an RPC connection.
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type cache struct {
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client *rpc.Client
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}
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// CacheServer wraps a packer.Cache implementation and makes it exportable
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// as part of a Golang RPC server.
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type CacheServer struct {
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cache packer.Cache
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}
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type CacheRLockResponse struct {
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Path string
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Exists bool
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}
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func (c *cache) Lock(key string) (result string) {
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if err := c.client.Call("Cache.Lock", key, &result); err != nil {
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log.Printf("[ERR] Cache.Lock error: %s", err)
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return
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}
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return
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}
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func (c *cache) RLock(key string) (string, bool) {
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var result CacheRLockResponse
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if err := c.client.Call("Cache.RLock", key, &result); err != nil {
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log.Printf("[ERR] Cache.RLock error: %s", err)
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return "", false
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}
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return result.Path, result.Exists
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}
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func (c *cache) Unlock(key string) {
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if err := c.client.Call("Cache.Unlock", key, new(interface{})); err != nil {
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log.Printf("[ERR] Cache.Unlock error: %s", err)
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return
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}
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}
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func (c *cache) RUnlock(key string) {
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if err := c.client.Call("Cache.RUnlock", key, new(interface{})); err != nil {
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log.Printf("[ERR] Cache.RUnlock error: %s", err)
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return
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}
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}
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func (c *CacheServer) Lock(key string, result *string) error {
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*result = c.cache.Lock(key)
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return nil
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}
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func (c *CacheServer) Unlock(key string, result *interface{}) error {
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c.cache.Unlock(key)
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return nil
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}
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func (c *CacheServer) RLock(key string, result *CacheRLockResponse) error {
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path, exists := c.cache.RLock(key)
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*result = CacheRLockResponse{path, exists}
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return nil
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}
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func (c *CacheServer) RUnlock(key string, result *interface{}) error {
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c.cache.RUnlock(key)
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return nil
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}
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