forked from vitessio/vitess
/
callinfo.go
51 lines (40 loc) · 1.25 KB
/
callinfo.go
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// Package callinfo stores custom values into the Context
// (related to the RPC source)
package callinfo
import (
"html/template"
"golang.org/x/net/context"
)
// CallInfo is the extra data stored in the Context
type CallInfo interface {
// RemoteAddr is the remote address information for this rpc call.
RemoteAddr() string
// Username is associated with this rpc call, if any.
Username() string
// Text is a text version of this connection, as specifically as possible.
Text() string
// HTML represents this rpc call connection in a web-friendly way.
HTML() template.HTML
}
// internal type and value
type key int
var callInfoKey key = 0
// NewContext adds the provided CallInfo to the context
func NewContext(ctx context.Context, ci CallInfo) context.Context {
return context.WithValue(ctx, callInfoKey, ci)
}
// FromContext returns the CallInfo value stored in ctx, if any.
func FromContext(ctx context.Context) (CallInfo, bool) {
ci, ok := ctx.Value(callInfoKey).(CallInfo)
return ci, ok
}
// HTMLFromContext returns that value of HTML() from the context, or "" if we're
// not able to recover one
func HTMLFromContext(ctx context.Context) template.HTML {
var h template.HTML
ci, ok := FromContext(ctx)
if ok {
return ci.HTML()
}
return h
}