1 files changed, 55 insertions, 0 deletions
diff --git a/vendor/src/github.com/alexedwards/stack/context.go b/vendor/src/github.com/alexedwards/stack/context.go
new file mode 100644
index 0000000..07afe21
--- /dev/null
+++ b/vendor/src/github.com/alexedwards/stack/context.go
@@ -0,0 +1,55 @@
+package stack
+
+import (
+	"sync"
+)
+
+type Context struct {
+	mu sync.RWMutex
+	m  map[string]interface{}
+}
+
+func NewContext() *Context {
+	m := make(map[string]interface{})
+	return &Context{m: m}
+}
+
+func (c *Context) Get(key string) interface{} {
+	if !c.Exists(key) {
+		return nil
+	}
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	return c.m[key]
+}
+
+func (c *Context) Put(key string, val interface{}) *Context {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	c.m[key] = val
+	return c
+}
+
+func (c *Context) Delete(key string) *Context {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+	delete(c.m, key)
+	return c
+}
+
+func (c *Context) Exists(key string) bool {
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	_, ok := c.m[key]
+	return ok
+}
+
+func (c *Context) copy() *Context {
+	nc := NewContext()
+	c.mu.RLock()
+	defer c.mu.RUnlock()
+	for k, v := range c.m {
+		nc.m[k] = v
+	}
+	return nc
+}