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context_test.go
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context_test.go
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package gotcha
import (
"context"
"testing"
"time"
"github.com/stretchr/testify/require"
)
func TestTracker(t *testing.T) {
t.Run("context with positive limits", func(t *testing.T) {
ctx := NewContext(
context.Background(),
ContextWithLimitBytes(10),
ContextWithLimitObjects(5),
ContextWithLimitCalls(3),
)
b, o, c := ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
lb, lo, lc := ctx.Limits()
require.Equal(t, int64(10), lb)
require.Equal(t, int64(5), lo)
require.Equal(t, int64(3), lc)
rb, ro, rc := ctx.Remains()
require.Equal(t, int64(10), rb)
require.Equal(t, int64(5), ro)
require.Equal(t, int64(3), rc)
require.False(t, ctx.Exceeded())
ctx.Add(2, 4, 2)
b, o, c = ctx.Used()
require.Equal(t, int64(8), b)
require.Equal(t, int64(4), o)
require.Equal(t, int64(2), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(10), lb)
require.Equal(t, int64(5), lo)
require.Equal(t, int64(3), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(2), rb)
require.Equal(t, int64(1), ro)
require.Equal(t, int64(1), rc)
require.False(t, ctx.Exceeded())
ctx.Add(3, 1, 1)
b, o, c = ctx.Used()
require.Equal(t, int64(11), b)
require.Equal(t, int64(5), o)
require.Equal(t, int64(3), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(10), lb)
require.Equal(t, int64(5), lo)
require.Equal(t, int64(3), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(0), rb)
require.Equal(t, int64(0), ro)
require.Equal(t, int64(0), rc)
require.True(t, ctx.Exceeded())
ctx.Reset()
b, o, c = ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(10), lb)
require.Equal(t, int64(5), lo)
require.Equal(t, int64(3), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(10), rb)
require.Equal(t, int64(5), ro)
require.Equal(t, int64(3), rc)
require.False(t, ctx.Exceeded())
ctx.Add(0, 0, 10)
b, o, c = ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(10), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(10), lb)
require.Equal(t, int64(5), lo)
require.Equal(t, int64(3), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(10), rb)
require.Equal(t, int64(5), ro)
require.Equal(t, int64(0), rc)
require.True(t, ctx.Exceeded())
})
t.Run("context with infinity limits", func(t *testing.T) {
ctx := NewContext(
context.Background(),
ContextWithLimitBytes(5*Infinity),
ContextWithLimitObjects(3),
)
b, o, c := ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
lb, lo, lc := ctx.Limits()
require.Equal(t, int64(5*Infinity), lb)
require.Equal(t, int64(3), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc := ctx.Remains()
require.Equal(t, int64(Infinity), rb)
require.Equal(t, int64(3), ro)
require.Equal(t, int64(Infinity), rc)
require.False(t, ctx.Exceeded())
ctx.Add(Petabyte, 1, Exa)
b, o, c = ctx.Used()
require.Equal(t, int64(Petabyte), b)
require.Equal(t, int64(1), o)
require.Equal(t, int64(Exa), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(5*Infinity), lb)
require.Equal(t, int64(3), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(Infinity), rb)
require.Equal(t, int64(2), ro)
require.Equal(t, int64(Infinity), rc)
require.False(t, ctx.Exceeded())
ctx.Add(Petabyte, 5, Exa)
b, o, c = ctx.Used()
require.Equal(t, int64(6*Petabyte), b)
require.Equal(t, int64(6), o)
require.Equal(t, int64(2*Exa), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(5*Infinity), lb)
require.Equal(t, int64(3), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(Infinity), rb)
require.Equal(t, int64(0), ro)
require.Equal(t, int64(Infinity), rc)
require.True(t, ctx.Exceeded())
ctx.Reset()
b, o, c = ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(5*Infinity), lb)
require.Equal(t, int64(3), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(Infinity), rb)
require.Equal(t, int64(3), ro)
require.Equal(t, int64(Infinity), rc)
require.False(t, ctx.Exceeded())
})
t.Run("context with infinity parent", func(t *testing.T) {
pctx := NewContext(
context.Background(),
ContextWithLimitBytes(10),
ContextWithLimitObjects(5),
ContextWithLimitCalls(3),
)
ctx := NewContext(
pctx,
ContextWithLimitBytes(Infinity),
ContextWithLimitObjects(Infinity),
ContextWithLimitCalls(Infinity),
)
b, o, c := ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
lb, lo, lc := ctx.Limits()
require.Equal(t, int64(Infinity), lb)
require.Equal(t, int64(Infinity), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc := ctx.Remains()
require.Equal(t, int64(10), rb)
require.Equal(t, int64(5), ro)
require.Equal(t, int64(3), rc)
require.False(t, ctx.Exceeded())
ctx.Add(5, 3, 3)
b, o, c = ctx.Used()
require.Equal(t, int64(15), b)
require.Equal(t, int64(3), o)
require.Equal(t, int64(3), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(Infinity), lb)
require.Equal(t, int64(Infinity), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(0), rb)
require.Equal(t, int64(2), ro)
require.Equal(t, int64(0), rc)
require.True(t, ctx.Exceeded())
ctx.Reset()
b, o, c = ctx.Used()
require.Equal(t, int64(0), b)
require.Equal(t, int64(0), o)
require.Equal(t, int64(0), c)
lb, lo, lc = ctx.Limits()
require.Equal(t, int64(Infinity), lb)
require.Equal(t, int64(Infinity), lo)
require.Equal(t, int64(Infinity), lc)
rb, ro, rc = ctx.Remains()
require.Equal(t, int64(0), rb)
require.Equal(t, int64(2), ro)
require.Equal(t, int64(0), rc)
require.True(t, ctx.Exceeded())
})
}
func TestContext(t *testing.T) {
t.Run("context with parent background", func(t *testing.T) {
ctx := NewContext(
context.Background(),
ContextWithLimitBytes(10),
ContextWithLimitObjects(5),
ContextWithLimitCalls(3),
)
_, dok := ctx.Deadline()
require.False(t, dok)
ch := ctx.Done()
time.Sleep(3 * time.Millisecond)
select {
case <-ch:
require.False(t, true)
default:
}
require.NoError(t, ctx.Err())
require.Nil(t, ctx.Value("test"))
ctx.Add(2, 5, 5)
_, dok = ctx.Deadline()
require.False(t, dok)
ch = ctx.Done()
select {
case <-ch:
default:
require.False(t, true)
}
require.Error(t, ctx.Err())
require.EqualValues(t, ContextLimitsExceeded{Context: ctx}, ctx.Err())
require.EqualValues(t, `context limits have been exceeded "on this context: 5 objects has been allocated with total size of 10 bytes within 5 calls"`, ctx.Err().Error())
require.Nil(t, ctx.Value("test"))
ctx.Reset()
_, dok = ctx.Deadline()
require.False(t, dok)
ch = ctx.Done()
time.Sleep(3 * time.Millisecond)
select {
case <-ch:
require.False(t, true)
default:
}
require.NoError(t, ctx.Err())
require.Nil(t, ctx.Value("test"))
ctx.Add(2, 5, 5)
time.Sleep(3 * time.Millisecond)
select {
case <-ch:
default:
require.False(t, true)
}
})
t.Run("context with parent canceled", func(t *testing.T) {
ctx, cancel := context.WithDeadline(
//nolint
context.WithValue(
context.Background(),
"test",
100,
),
time.Now().UTC().Add(time.Nanosecond),
)
cancel()
ctx = NewContext(
ctx,
ContextWithLimitBytes(10),
ContextWithLimitObjects(5),
ContextWithLimitCalls(3),
)
_, dok := ctx.Deadline()
require.True(t, dok)
ch := ctx.Done()
time.Sleep(3 * time.Millisecond)
select {
case <-ch:
default:
require.False(t, true)
}
require.Error(t, ctx.Err())
require.Equal(t, 100, ctx.Value("test"))
})
}