Add TrimmedAppID to info service.

service/info/context.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package info
 
 import (
         "golang.org/x/net/context"
 )
 
 type key int
 
 var (
         infoKey       key
         infoFilterKey key = 1
 )
 
 // Factory is the function signature for factory methods compatible with
 // SetFactory.
-type Factory func(context.Context) Interface
+type Factory func(context.Context) RawInterface
 
 // Filter is the function signature for a filter GI implementation. It
 // gets the current GI implementation, and returns a new GI implementation
 // backed by the one passed in.
-type Filter func(context.Context, Interface) Interface
+type Filter func(context.Context, RawInterface) RawInterface
 
-// getUnfiltered gets gets the Interface implementation from context without
+// getUnfiltered gets gets the RawInterface implementation from context without
 // any of the filters applied.
-func getUnfiltered(c context.Context) Interface {
+func getUnfiltered(c context.Context) RawInterface {
         if f, ok := c.Value(infoKey).(Factory); ok && f != nil {
                 return f(c)
         }
         return nil
 }
 
 // Get gets the Interface implementation from context.
 func Get(c context.Context) Interface {
         ret := getUnfiltered(c)
         if ret == nil {
                 return nil
         }
         for _, f := range getCurFilters(c) {
                 ret = f(c, ret)
         }
-        return ret
+        return infoImpl{ret}
 }
 
-// SetFactory sets the function to produce Interface instances, as returned
+// SetFactory sets the function to produce RawInterface instances, as returned
 // by the Get method.
 func SetFactory(c context.Context, gif Factory) context.Context {
         return context.WithValue(c, infoKey, gif)
 }
 
-// Set sets the current Interface object in the context. Useful for testing
+// Set sets the current RawInterface object in the context. Useful for testing
 // with a quick mock. This is just a shorthand SetFactory invocation to set
 // a factory which always returns the same object.
-func Set(c context.Context, gi Interface) context.Context {
-        return SetFactory(c, func(context.Context) Interface { return gi })
+func Set(c context.Context, gi RawInterface) context.Context {
+        return SetFactory(c, func(context.Context) RawInterface { return gi })
 }
 
 func getCurFilters(c context.Context) []Filter {
         curFiltsI := c.Value(infoFilterKey)
         if curFiltsI != nil {
                 return curFiltsI.([]Filter)
         }
         return nil
 }
 
-// AddFilters adds Interface filters to the context.
+// AddFilters adds RawInterface filters to the context.
 func AddFilters(c context.Context, filts ...Filter) context.Context {
         if len(filts) == 0 {
                 return c
         }
         cur := getCurFilters(c)
         newFilts := make([]Filter, 0, len(cur)+len(filts))
         newFilts = append(newFilts, getCurFilters(c)...)
         newFilts = append(newFilts, filts...)
         return context.WithValue(c, infoFilterKey, newFilts)
 }