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package utils_test
import (
"fmt"
"time"
"golang.org/x/net/context"
"github.com/juju/testing"
jc "github.com/juju/testing/checkers"
gc "gopkg.in/check.v1"
"github.com/juju/utils"
)
type contextSuite struct{}
var _ = gc.Suite(&contextSuite{})
// Note: the logic in these tests was copied from the tests
// in the Go standard library.
func (*contextSuite) TestDeadline(c *gc.C) {
clk := testing.NewClock(time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC))
ctx, cancel := utils.ContextWithDeadline(context.Background(), clk, clk.Now().Add(50*time.Millisecond))
defer cancel()
c.Assert(fmt.Sprint(ctx), gc.Equals, `context.Background.WithDeadline(2000-01-01 00:00:00.05 +0000 UTC [50ms])`)
testContextDeadline(c, ctx, "WithDeadline", clk, 1, 50*time.Millisecond)
ctx, cancel = utils.ContextWithDeadline(context.Background(), clk, clk.Now().Add(50*time.Millisecond))
defer cancel()
o := otherContext{ctx}
testContextDeadline(c, o, "WithDeadline+otherContext", clk, 1, 50*time.Millisecond)
ctx, cancel = utils.ContextWithDeadline(context.Background(), clk, clk.Now().Add(50*time.Millisecond))
defer cancel()
o = otherContext{ctx}
ctx, _ = utils.ContextWithDeadline(o, clk, clk.Now().Add(4*time.Second))
testContextDeadline(c, ctx, "WithDeadline+otherContext+WithDeadline", clk, 2, 50*time.Millisecond)
ctx, cancel = utils.ContextWithDeadline(context.Background(), clk, clk.Now().Add(-time.Millisecond))
defer cancel()
testContextDeadline(c, ctx, "WithDeadline+inthepast", clk, 0, 0)
ctx, cancel = utils.ContextWithDeadline(context.Background(), clk, clk.Now())
testContextDeadline(c, ctx, "WithDeadline+now", clk, 0, 0)
}
func (*contextSuite) TestTimeout(c *gc.C) {
clk := testing.NewClock(time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC))
ctx, _ := utils.ContextWithTimeout(context.Background(), clk, 50*time.Millisecond)
c.Assert(fmt.Sprint(ctx), gc.Equals, `context.Background.WithDeadline(2000-01-01 00:00:00.05 +0000 UTC [50ms])`)
testContextDeadline(c, ctx, "WithTimeout", clk, 1, 50*time.Millisecond)
ctx, _ = utils.ContextWithTimeout(context.Background(), clk, 50*time.Millisecond)
o := otherContext{ctx}
testContextDeadline(c, o, "WithTimeout+otherContext", clk, 1, 50*time.Millisecond)
ctx, _ = utils.ContextWithTimeout(context.Background(), clk, 50*time.Millisecond)
o = otherContext{ctx}
ctx, _ = utils.ContextWithTimeout(o, clk, 3*time.Second)
testContextDeadline(c, ctx, "WithTimeout+otherContext+WithTimeout", clk, 2, 50*time.Millisecond)
}
func (*contextSuite) TestCanceledTimeout(c *gc.C) {
clk := testing.NewClock(time.Date(2000, time.January, 1, 0, 0, 0, 0, time.UTC))
ctx, _ := utils.ContextWithTimeout(context.Background(), clk, time.Second)
o := otherContext{ctx}
ctx, cancel := utils.ContextWithTimeout(o, clk, 2*time.Second)
cancel()
time.Sleep(100 * time.Millisecond) // let cancelation propagate
select {
case <-ctx.Done():
default:
c.Errorf("<-ctx.Done() blocked, but shouldn't have")
}
c.Assert(ctx.Err(), gc.Equals, context.Canceled)
}
func testContextDeadline(c *gc.C, ctx context.Context, name string, clk *testing.Clock, waiters int, failAfter time.Duration) {
err := clk.WaitAdvance(failAfter, 0, waiters)
c.Assert(err, jc.ErrorIsNil)
select {
case <-time.After(time.Second):
c.Fatalf("%s: context should have timed out", name)
case <-ctx.Done():
}
c.Assert(ctx.Err(), gc.Equals, context.DeadlineExceeded)
}
// otherContext is a Context that's not one of the types defined in context.go.
// This lets us test code paths that differ based on the underlying type of the
// Context.
type otherContext struct {
context.Context
}
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