context.go

package middleware

import (
	"math"
	"time"
)

type Context struct {
	mid *Middleware
    index int8
	handlers HandlersChain
	Keys map[string]interface{}
    Errors []error
}

const abortIndex int8 = math.MaxInt8 / 2

func (c *Context) Next() {
	c.index++
	for s := int8(len(c.handlers)); c.index < s; c.index++ {
		c.handlers[c.index](c)
	}
}

// IsAborted returns true if the current context was aborted.
func (c *Context) IsAborted() bool {
	return c.index >= abortIndex
}

// Call Abort to ensure the remaining handlers are not called
// If c.index >= abortIndex the Next method will not exec
func (c *Context) Abort() {
	c.index = abortIndex
}

func (c *Context) reset() {
	c.index = -1
	c.handlers = nil
	c.Keys = nil
	c.Errors = c.Errors[0: 0]
}

/************************************/
/******** METADATA MANAGEMENT********/
/************************************/

// Set is used to store a new key/value pair exclusively for this context.
// It also lazy initializes  c.Keys if it was not used previously.
func (c *Context) Set(key string, value interface{}) {
	if c.Keys == nil {
		c.Keys = make(map[string]interface{})
	}
	c.Keys[key] = value
}

// Get returns the value for the given key, ie: (value, true).
// If the value does not exists it returns (nil, false)
func (c *Context) Get(key string) (value interface{}, exists bool) {
	value, exists = c.Keys[key]
	return
}

// MustGet returns the value for the given key if it exists, otherwise it panics.
func (c *Context) MustGet(key string) interface{} {
	if value, exists := c.Get(key); exists {
		return value
	}
	panic("Key \"" + key + "\" does not exist")
}

// GetString returns the value associated with the key as a string.
func (c *Context) GetString(key string) (s string) {
	if val, ok := c.Get(key); ok && val != nil {
		s, _ = val.(string)
	}
	return
}

// GetBool returns the value associated with the key as a boolean.
func (c *Context) GetBool(key string) (b bool) {
	if val, ok := c.Get(key); ok && val != nil {
		b, _ = val.(bool)
	}
	return
}

// GetInt returns the value associated with the key as an integer.
func (c *Context) GetInt(key string) (i int) {
	if val, ok := c.Get(key); ok && val != nil {
		i, _ = val.(int)
	}
	return
}

// GetInt64 returns the value associated with the key as an integer.
func (c *Context) GetInt64(key string) (i64 int64) {
	if val, ok := c.Get(key); ok && val != nil {
		i64, _ = val.(int64)
	}
	return
}

// GetFloat64 returns the value associated with the key as a float64.
func (c *Context) GetFloat64(key string) (f64 float64) {
	if val, ok := c.Get(key); ok && val != nil {
		f64, _ = val.(float64)
	}
	return
}

// GetTime returns the value associated with the key as time.
func (c *Context) GetTime(key string) (t time.Time) {
	if val, ok := c.Get(key); ok && val != nil {
		t, _ = val.(time.Time)
	}
	return
}

// GetDuration returns the value associated with the key as a duration.
func (c *Context) GetDuration(key string) (d time.Duration) {
	if val, ok := c.Get(key); ok && val != nil {
		d, _ = val.(time.Duration)
	}
	return
}

// GetStringSlice returns the value associated with the key as a slice of strings.
func (c *Context) GetStringSlice(key string) (ss []string) {
	if val, ok := c.Get(key); ok && val != nil {
		ss, _ = val.([]string)
	}
	return
}

// GetStringMap returns the value associated with the key as a map of interfaces.
func (c *Context) GetStringMap(key string) (sm map[string]interface{}) {
	if val, ok := c.Get(key); ok && val != nil {
		sm, _ = val.(map[string]interface{})
	}
	return
}

// GetStringMapString returns the value associated with the key as a map of strings.
func (c *Context) GetStringMapString(key string) (sms map[string]string) {
	if val, ok := c.Get(key); ok && val != nil {
		sms, _ = val.(map[string]string)
	}
	return
}

// GetStringMapStringSlice returns the value associated with the key as a map to a slice of strings.
func (c *Context) GetStringMapStringSlice(key string) (smss map[string][]string) {
	if val, ok := c.Get(key); ok && val != nil {
		smss, _ = val.(map[string][]string)
	}
	return
}