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package attributes
import (
"context"
"errors"
"net/http"
)
// contextKey is a value for use with context.WithValue. It's used as
// a pointer fits an interface{} without allocation.
type contextKey struct {
name string
}
func (k *contextKey) String() string { return k.name }
var (
// PsrContextKey is a context key. It can be used in the http attributes
PsrContextKey = &contextKey{"psr_attributes"}
)
type attrs map[string]interface{}
func (v attrs) get(key string) interface{} {
if v == nil {
return ""
}
return v[key]
}
func (v attrs) set(key string, value interface{}) {
v[key] = value
}
func (v attrs) del(key string) {
delete(v, key)
}
// Init returns request with new context and attribute bag.
func Init(r *http.Request) *http.Request {
return r.WithContext(context.WithValue(r.Context(), PsrContextKey, attrs{}))
}
// All returns all context attributes.
func All(r *http.Request) map[string]interface{} {
v := r.Context().Value(PsrContextKey)
if v == nil {
return attrs{}
}
return v.(attrs)
}
// Get gets the value from request context. It replaces any existing
// values.
func Get(r *http.Request, key string) interface{} {
v := r.Context().Value(PsrContextKey)
if v == nil {
return nil
}
return v.(attrs).get(key)
}
// Set sets the key to value. It replaces any existing
// values. Context specific.
func Set(r *http.Request, key string, value interface{}) error {
v := r.Context().Value(PsrContextKey)
if v == nil {
return errors.New("unable to find `psr:attributes` context key")
}
v.(attrs).set(key, value)
return nil
}
// Delete deletes values associated with attribute key.
func (v attrs) Delete(key string) {
if v == nil {
return
}
v.del(key)
}
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