x/talks/2014/gotham-context: talk for GothamGo 2014 in NYC.
LGTM=bcmills, adg
R=bcmills, adg, minux
CC=golang-codereviews
https://golang.org/cl/170290043
diff --git a/2014/gotham-context.slide b/2014/gotham-context.slide
new file mode 100644
index 0000000..afe00f0
--- /dev/null
+++ b/2014/gotham-context.slide
@@ -0,0 +1,329 @@
+Cancelation, Context, and Plumbing
+GothamGo 2014
+
+Sameer Ajmani
+sameer@golang.org
+
+* Introduction
+
+In Go servers, each incoming request is handled in its own goroutine.
+
+Handler code needs access to request-specific values:
+
+- security credentials
+- request deadline
+- operation priority
+
+When the request completes or times out, its work should be canceled.
+
+* Cancelation
+
+Abandon work when the caller no longer needs the result.
+
+- user navigates away, closes connection
+- operation exceeds its deadline
+- when using hedged requests, cancel the laggards
+
+Efficiently canceling unneeded work saves resources.
+
+* Cancelation is advisory
+
+Cancelation does not stop execution or trigger panics.
+
+Cancelation informs code that its work is no longer needed.
+
+Code checks for cancelation and decides what to do:
+shut down, clean up, return errors.
+
+* Cancelation is transitive
+
+.image gotham-context/transitive.svg
+
+* Cancelation affects all APIs on the request path
+
+Network protocols support cancelation.
+
+- HTTP: close the connection
+- RPC: send a control message
+
+APIs above network need cancelation, too.
+
+- Database clients
+- Network file system clients
+- Cloud service clients
+
+And all the layers atop those, up to the UI.
+
+*Goal:* provide a uniform cancelation API that works across package boundaries.
+
+* Cancelation APIs
+
+Many Go APIs support cancelation and deadlines already.
+
+Go APIs are synchronous, so cancelation comes from another goroutine.
+
+Method on the connection or client object:
+
+ // goroutine #1
+ result, err := conn.Do(req)
+
+ // goroutine #2
+ conn.Cancel(req)
+
+Method on the request object:
+
+ // goroutine #1
+ result, err := conn.Do(req)
+
+ // goroutine #2
+ req.Cancel()
+
+* Cancelation APIs (continued)
+
+Method on the pending result object:
+
+ // goroutine #1
+ pending := conn.Start(req)
+ ...
+ result, err := pending.Result()
+
+ // goroutine #2
+ pending.Cancel()
+
+
+Different cancelation APIs in each package are a headache.
+
+We need one that's independent of package or transport:
+
+ // goroutine #1
+ result, err := conn.Do(x, req)
+
+ // goroutine #2
+ x.Cancel()
+
+* Context
+
+A `Context` carries a cancelation signal and request-scoped values to all functions running on behalf of the same task. It's safe for concurrent access.
+
+.code gotham-context/interface.go /type Context/,/^}/
+
+*Idiom:* pass `ctx` as the first argument to a function.
+
+ import "golang.org/x/net/context"
+
+ // ReadFile reads file name and returns its contents.
+ // If ctx.Done is closed, ReadFile returns ctx.Err immediately.
+ func ReadFile(ctx context.Context, name string) ([]byte, error)
+
+Examples and discussion in [[http://blog.golang.org/context][blog.golang.org/context]].
+
+* Contexts are hierarchical
+
+`Context` has no `Cancel` method; obtain a cancelable `Context` using `WithCancel`:
+
+.code gotham-context/interface.go /WithCancel /,/func WithCancel/
+
+Passing a `Context` to a function does not pass the ability to cancel that `Context`.
+
+ // goroutine #1
+ ctx, cancel := context.WithCancel(parent)
+ ...
+ data, err := ReadFile(ctx, name)
+
+ // goroutine #2
+ cancel()
+
+Contexts form a tree, any subtree of which can be canceled.
+
+* Why does Done return a channel?
+
+Closing a channel works well as a broadcast signal.
+
+_After_the_last_value_has_been_received_from_a_closed_channel_c,_any_receive_from_c_will_succeed_without_blocking,_returning_the_zero_value_for_the_channel_element._
+
+Any number of goroutines can `select` on `<-ctx.Done()`.
+
+Examples and discussion in in [[http://blog.golang.org/pipelines][blog.golang.org/pipelines]].
+
+Using `close` requires care.
+
+- closing a nil channel panics
+- closing a closed channel panics
+
+`Done` returns a receive-only channel that can only be canceled using the `cancel` function returned by `WithCancel`. It ensures the channel is closed exactly once.
+
+* Context values
+
+Contexts carry request-scoped values across API boundaries.
+
+- deadline
+- cancelation signal
+- security credentials
+- distributed trace IDs
+- operation priority
+- network QoS label
+
+RPC clients encode `Context` values onto the wire.
+
+RPC servers decode them into a new `Context` for the handler function.
+
+* Replicated Search
+
+Example from [[https://talks.golang.org/2012/concurrency.slide][Go Concurrency Patterns]].
+
+.code gotham-context/first.go /START1/,/STOP1/
+
+Remaining searches may continue running after First returns.
+
+* Cancelable Search
+
+.code gotham-context/first-context.go /START1/,/STOP1/
+
+* Context plumbing
+
+*Goal:* pass a `Context` parameter from each inbound RPC at a server through the call stack to each outgoing RPC.
+
+.code gotham-context/before.go /START/,/END/
+
+* Context plumbing (after)
+
+.code gotham-context/after.go /START/,/END/
+
+* Problem: Existing and future code
+
+Google has millions of lines of Go code.
+
+We've retrofitted the internal RPC and distributed file system APIs to take a Context.
+
+Lots more to do, growing every day.
+
+* Why not use (something like) thread local storage?
+
+C++ and Java pass request state in thread-local storage.
+
+Requires no API changes, but ...
+requires custom thread and callback libraries.
+
+Mostly works, except when it doesn't. Failures are hard to debug.
+
+Serious consequences if credential-passing bugs affect user privacy.
+
+"Goroutine-local storage" doesn't exist, and even if it did,
+request processing may flow between goroutines via channels.
+
+We won't sacrifice clarity for convenience.
+
+* In Go, pass Context explicitly
+
+Easy to tell when a Context passes between functions, goroutines, and processes.
+
+Invest up front to make the system easier to maintain:
+
+- update relevant functions to accept a `Context`
+- update function calls to provide a `Context`
+- update interface methods and implementations
+
+Go's awesome tools can help.
+
+* Automated refactoring
+
+*Initial*State:*
+
+Pass `context.TODO()` to outbound RPCs.
+
+`context.TODO()` is a sentinel for static analysis tools. Use it wherever a `Context` is needed but there isn't one available.
+
+*Iteration:*
+
+For each function `F(x)` whose body contains `context.TODO()`,
+
+- add a `Context` parameter to `F`
+- update callers to use `F(context.TODO(),`x)`
+- if the caller has a `Context` available, pass it to `F` instead
+
+Repeat until `context.TODO()` is gone.
+
+* Finding relevant functions
+
+The [[http://godoc.org/golang.org/x/tools/cmd/callgraph][golang.org/x/tools/cmd/callgraph]] tool constructs the call graph of a Go program.
+
+It uses whole-program pointer analysis to find dynamic calls (via interfaces or function values).
+
+*For*context*plumbing:*
+
+Find all functions on call paths from `Context` _suppliers_ (inbound RPCs) to `Context` _consumers_ (`context.TODO`).
+
+* Updating function calls
+
+To change add all `F(x)` to `F(context.TODO(),`x)`:
+
+- define `FContext(ctx,`x)`
+- `F(x)` → `FContext(context.TODO(),`x)`
+- change `F(x)` to `F(ctx,`x)`
+- `FContext(context.TODO(),`x)` → `F(context.TODO(),`x)`
+- remove `FContext(ctx,`x)`
+
+* gofmt -r
+
+Works well for simple replacements:
+
+ gofmt -r 'pkg.F(a) -> pkg.FContext(context.TODO(), a)'
+
+But this is too imprecise for methods. There may be many methods named M:
+
+ gofmt -r 'x.M(y) -> x.MContext(context.TODO(), y)'
+
+We want to restrict the transformation to specific method signatures.
+
+* The eg tool
+
+The [[http://godoc.org/golang.org/x/tools/cmd/eg][golang.org/x/tools/cmd/eg]] tool performs precise example-based refactoring.
+
+The `before` expression specifies a pattern and the `after` expression its replacement.
+
+To replace `x.M(y)` with `x.MContext(context.TODO(),`y)`:
+
+.code gotham-context/eg.go
+
+* Dealing with interfaces
+
+We need to update dynamic calls to `x.M(y)`.
+
+If `M` called via interface `I`, then `I.M` also needs to change. The eg tool can update call sites with receiver type `I`.
+
+When we change `I`, we need to update all of its implementations.
+
+Find types assignable to `I` using [[http://godoc.org/golang.org/x/tools/go/types][golang.org/x/tools/go/types]].
+
+More to do here.
+
+* What about the standard library?
+
+The Go 1.0 compatibility guarantee means we will not break existing code.
+
+Interfaces like `io.Reader` and `io.Writer` are widely used.
+
+For Google files, used a currying approach:
+
+ f, err := file.Open(ctx, "/gfs/cell/path")
+ ...
+ fio := f.IO(ctx) // returns an io.ReadWriteCloser that passes ctx
+ data, err := ioutil.ReadAll(fio)
+
+For versioned public packages, add `Context` parameters in a new API version and provide `eg` templates to insert `context.TODO()`.
+
+More to do here.
+
+* Conclusion
+
+Cancelation needs a uniform API across package boundaries.
+
+Retrofitting code is hard, but Go is tool-friendly.
+
+New code should use `Context`.
+
+Links:
+
+- [[http://golang.org/x/net/context][golang.org/x/net/context]] - package
+- [[http://blog.golang.org/context][blog.golang.org/context]] - blog post
+- [[http://golang.org/x/tools/cmd/eg][golang.org/x/tools/cmd/eg]] - eg tool
diff --git a/2014/gotham-context/after.go b/2014/gotham-context/after.go
new file mode 100644
index 0000000..c86662c
--- /dev/null
+++ b/2014/gotham-context/after.go
@@ -0,0 +1,18 @@
+// +build OMIT
+
+package after
+
+// START OMIT
+func (*ServiceA) HandleRPC(ctx context.Context, a Arg) {
+ f(ctx, a)
+}
+
+func f(ctx context.Context, a Args) { // HL
+ x.M(ctx, a)
+}
+
+func (x *X) M(ctx context.Context, a Args) { // HL
+ serviceB.IssueRPC(ctx, a)
+}
+
+// END OMIT
diff --git a/2014/gotham-context/before.go b/2014/gotham-context/before.go
new file mode 100644
index 0000000..79a1efa
--- /dev/null
+++ b/2014/gotham-context/before.go
@@ -0,0 +1,19 @@
+// +build OMIT
+
+package before
+
+// START OMIT
+func (*ServiceA) HandleRPC(ctx context.Context, a Arg) {
+ f(a)
+}
+
+func f(a Args) {
+ x.M(a)
+}
+
+func (x *X) M(a Args) {
+ // TODO(sameer): pass a real Context here.
+ serviceB.IssueRPC(context.TODO(), a) // HL
+}
+
+// END OMIT
diff --git a/2014/gotham-context/eg.go b/2014/gotham-context/eg.go
new file mode 100644
index 0000000..c314f4d
--- /dev/null
+++ b/2014/gotham-context/eg.go
@@ -0,0 +1,18 @@
+// +build OMIT
+
+package P
+
+import (
+ "xpkg"
+ "ypkg"
+
+ "golang.org/x/net/context"
+)
+
+func before(x xpkg.X, y ypkg.Y) error { // HL
+ return x.M(y)
+}
+
+func after(x xpkg.X, y ypkg.Y) error { // HL
+ return x.MContext(context.TODO(), y)
+}
diff --git a/2014/gotham-context/first-context.go b/2014/gotham-context/first-context.go
new file mode 100644
index 0000000..dde0ffa
--- /dev/null
+++ b/2014/gotham-context/first-context.go
@@ -0,0 +1,61 @@
+// +build OMIT
+
+package main
+
+import (
+ "fmt"
+ "math/rand"
+ "time"
+
+ "golang.org/x/net/context"
+)
+
+type Result struct {
+ Hit string
+ Err error
+}
+
+// START1 OMIT
+// Search runs query on a backend and returns the result.
+type Search func(ctx context.Context, query string) Result // HL
+
+// First runs query on replicas and returns the first result.
+func First(ctx context.Context, query string, replicas ...Search) Result {
+ c := make(chan Result, len(replicas))
+ ctx, cancel := context.WithCancel(ctx) // HL
+ defer cancel() // HL
+ search := func(replica Search) { c <- replica(ctx, query) } // HL
+ for _, replica := range replicas {
+ go search(replica)
+ }
+ select {
+ case <-ctx.Done(): // HL
+ return Result{Err: ctx.Err()} // HL
+ case r := <-c:
+ return r
+ }
+}
+
+// STOP1 OMIT
+
+// START2 OMIT
+func main() {
+ rand.Seed(time.Now().UnixNano())
+ start := time.Now()
+ result := First(context.Background(),
+ "golang",
+ fakeSearch("replica 1"),
+ fakeSearch("replica 2"))
+ elapsed := time.Since(start)
+ fmt.Printf("%+v\n", result)
+ fmt.Println(elapsed)
+}
+
+// STOP2 OMIT
+
+func fakeSearch(kind string) Search {
+ return func(ctx context.Context, query string) Result {
+ time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
+ return Result{Hit: fmt.Sprintf("%s result for %q\n", kind, query)}
+ }
+}
diff --git a/2014/gotham-context/first.go b/2014/gotham-context/first.go
new file mode 100644
index 0000000..47bee60
--- /dev/null
+++ b/2014/gotham-context/first.go
@@ -0,0 +1,50 @@
+// +build OMIT
+
+package main
+
+import (
+ "fmt"
+ "math/rand"
+ "time"
+)
+
+// START1 OMIT
+// Search runs query on a backend and returns the result.
+type Search func(query string) Result
+type Result struct {
+ Hit string
+ Err error
+}
+
+// First runs query on replicas and returns the first result.
+func First(query string, replicas ...Search) Result {
+ c := make(chan Result, len(replicas))
+ search := func(replica Search) { c <- replica(query) }
+ for _, replica := range replicas {
+ go search(replica)
+ }
+ return <-c
+}
+
+// STOP1 OMIT
+
+// START2 OMIT
+func main() {
+ rand.Seed(time.Now().UnixNano())
+ start := time.Now()
+ result := First("golang",
+ fakeSearch("replica 1"),
+ fakeSearch("replica 2"))
+ elapsed := time.Since(start)
+ fmt.Printf("%+v\n", result)
+ fmt.Println(elapsed)
+}
+
+// STOP2 OMIT
+
+func fakeSearch(kind string) Search {
+ return func(query string) Result {
+ time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond)
+ return Result{Hit: fmt.Sprintf("%s result for %q\n", kind, query)}
+ }
+}
diff --git a/2014/gotham-context/interface.go b/2014/gotham-context/interface.go
new file mode 100644
index 0000000..a203450
--- /dev/null
+++ b/2014/gotham-context/interface.go
@@ -0,0 +1,37 @@
+// +build OMIT
+
+package context
+
+import "time"
+
+// A Context carries a deadline, cancelation signal, and request-scoped values
+// across API boundaries. Its methods are safe for simultaneous use by multiple
+// goroutines.
+type Context interface {
+ Done() <-chan struct{} // closed when this Context is canceled
+ Err() error // why this Context was canceled
+ Deadline() (deadline time.Time, ok bool) // when this Context will be canceled
+ Value(key interface{}) interface{} // data associated with this Context
+}
+
+// WithCancel returns a copy of parent whose Done channel is closed as soon as
+// parent.Done is closed or cancel is called.
+func WithCancel(parent Context) (ctx Context, cancel CancelFunc)
+
+// A CancelFunc cancels a Context.
+type CancelFunc func()
+
+// WithTimeout returns a copy of parent whose Done channel is closed as soon as
+// parent.Done is closed, cancel is called, or timeout elapses. The new
+// Context's Deadline is the sooner of now+timeout and the parent's deadline, if
+// any. If the timer is still running, the cancel function releases its
+// resources.
+func WithTimeout(parent Context, timeout time.Duration) (Context, CancelFunc)
+
+// WithValue returns a copy of parent whose Value method returns val for key.
+func WithValue(parent Context, key interface{}, val interface{}) Context
+
+// Background returns an empty Context. It is never canceled, has no deadline,
+// and has no values. Background is typically used in main, init, and tests,
+// and as the top-level Context for incoming requests.
+func Background() Context
diff --git a/2014/gotham-context/transitive.svg b/2014/gotham-context/transitive.svg
new file mode 100644
index 0000000..e89c01d
--- /dev/null
+++ b/2014/gotham-context/transitive.svg
@@ -0,0 +1,4 @@
+<?xml version="1.0" standalone="yes"?>
+
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