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