diff options
Diffstat (limited to 'vendor/github.com/docker/distribution/context/context.go')
-rw-r--r-- | vendor/github.com/docker/distribution/context/context.go | 85 |
1 files changed, 0 insertions, 85 deletions
diff --git a/vendor/github.com/docker/distribution/context/context.go b/vendor/github.com/docker/distribution/context/context.go deleted file mode 100644 index 23cbf5b54..000000000 --- a/vendor/github.com/docker/distribution/context/context.go +++ /dev/null @@ -1,85 +0,0 @@ -package context - -import ( - "sync" - - "github.com/docker/distribution/uuid" - "golang.org/x/net/context" -) - -// Context is a copy of Context from the golang.org/x/net/context package. -type Context interface { - context.Context -} - -// instanceContext is a context that provides only an instance id. It is -// provided as the main background context. -type instanceContext struct { - Context - id string // id of context, logged as "instance.id" - once sync.Once // once protect generation of the id -} - -func (ic *instanceContext) Value(key interface{}) interface{} { - if key == "instance.id" { - ic.once.Do(func() { - // We want to lazy initialize the UUID such that we don't - // call a random generator from the package initialization - // code. For various reasons random could not be available - // https://github.com/docker/distribution/issues/782 - ic.id = uuid.Generate().String() - }) - return ic.id - } - - return ic.Context.Value(key) -} - -var background = &instanceContext{ - Context: context.Background(), -} - -// Background returns a non-nil, empty Context. The background context -// provides a single key, "instance.id" that is globally unique to the -// process. -func Background() Context { - return background -} - -// WithValue returns a copy of parent in which the value associated with key is -// val. Use context Values only for request-scoped data that transits processes -// and APIs, not for passing optional parameters to functions. -func WithValue(parent Context, key, val interface{}) Context { - return context.WithValue(parent, key, val) -} - -// stringMapContext is a simple context implementation that checks a map for a -// key, falling back to a parent if not present. -type stringMapContext struct { - context.Context - m map[string]interface{} -} - -// WithValues returns a context that proxies lookups through a map. Only -// supports string keys. -func WithValues(ctx context.Context, m map[string]interface{}) context.Context { - mo := make(map[string]interface{}, len(m)) // make our own copy. - for k, v := range m { - mo[k] = v - } - - return stringMapContext{ - Context: ctx, - m: mo, - } -} - -func (smc stringMapContext) Value(key interface{}) interface{} { - if ks, ok := key.(string); ok { - if v, ok := smc.m[ks]; ok { - return v - } - } - - return smc.Context.Value(key) -} |