88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
|
// Copyright 2018 Adam Tauber
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
package colly
|
||
|
|
|
||
|
|
import (
|
||
|
|
"sync"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Context provides a tiny layer for passing data between callbacks
|
||
|
|
type Context struct {
|
||
|
|
contextMap map[string]interface{}
|
||
|
|
lock *sync.RWMutex
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewContext initializes a new Context instance
|
||
|
|
func NewContext() *Context {
|
||
|
|
return &Context{
|
||
|
|
contextMap: make(map[string]interface{}),
|
||
|
|
lock: &sync.RWMutex{},
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// UnmarshalBinary decodes Context value to nil
|
||
|
|
// This function is used by request caching
|
||
|
|
func (c *Context) UnmarshalBinary(_ []byte) error {
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// MarshalBinary encodes Context value
|
||
|
|
// This function is used by request caching
|
||
|
|
func (c *Context) MarshalBinary() (_ []byte, _ error) {
|
||
|
|
return nil, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Put stores a value of any type in Context
|
||
|
|
func (c *Context) Put(key string, value interface{}) {
|
||
|
|
c.lock.Lock()
|
||
|
|
c.contextMap[key] = value
|
||
|
|
c.lock.Unlock()
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get retrieves a string value from Context.
|
||
|
|
// Get returns an empty string if key not found
|
||
|
|
func (c *Context) Get(key string) string {
|
||
|
|
c.lock.RLock()
|
||
|
|
defer c.lock.RUnlock()
|
||
|
|
if v, ok := c.contextMap[key]; ok {
|
||
|
|
return v.(string)
|
||
|
|
}
|
||
|
|
return ""
|
||
|
|
}
|
||
|
|
|
||
|
|
// GetAny retrieves a value from Context.
|
||
|
|
// GetAny returns nil if key not found
|
||
|
|
func (c *Context) GetAny(key string) interface{} {
|
||
|
|
c.lock.RLock()
|
||
|
|
defer c.lock.RUnlock()
|
||
|
|
if v, ok := c.contextMap[key]; ok {
|
||
|
|
return v
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// ForEach iterate context
|
||
|
|
func (c *Context) ForEach(fn func(k string, v interface{}) interface{}) []interface{} {
|
||
|
|
c.lock.RLock()
|
||
|
|
defer c.lock.RUnlock()
|
||
|
|
|
||
|
|
ret := make([]interface{}, 0, len(c.contextMap))
|
||
|
|
for k, v := range c.contextMap {
|
||
|
|
ret = append(ret, fn(k, v))
|
||
|
|
}
|
||
|
|
|
||
|
|
return ret
|
||
|
|
}
|