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v/vlib/context/onecontext/onecontext_test.v

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module onecontext
import context
import time
fn eventually(ch chan int) bool {
mut background := context.background()
mut timeout, cancel := context.with_timeout(mut &background, 30 * time.millisecond)
defer {
cancel()
}
tdone := timeout.done()
select {
_ := <-ch {
return true
}
_ := <-tdone {
return false
}
}
return false
}
struct Value {
val string
}
fn test_merge_nomilan() {
mut background := context.background()
foo := &Value{
val: 'foo'
}
mut value_ctx1 := context.with_value(background, 'foo', foo)
mut ctx1, cancel := context.with_cancel(mut &value_ctx1)
defer {
cancel()
}
bar := &Value{
val: 'bar'
}
mut value_ctx2 := context.with_value(background, 'bar', bar)
mut ctx2, _ := context.with_cancel(mut &value_ctx2)
mut ctx, cancel2 := merge(ctx1, ctx2)
if deadline := ctx.deadline() {
panic('this should never happen')
}
val1 := ctx.value('foo') or { panic('wrong value access for key `foo`') }
match val1 {
Value {
assert foo == val1
}
else {
assert false
}
}
val2 := ctx.value('bar') or { panic('wrong value access for key `bar`') }
match val2 {
Value {
assert bar == val2
}
else {
assert false
}
}
if _ := ctx.value('baz') {
panic('this should never happen')
}
assert !eventually(ctx.done())
assert ctx.err() is none
cancel2()
assert eventually(ctx.done())
assert ctx.err() is Error
}
fn test_merge_deadline_context_1() {
mut background := context.background()
mut ctx1, cancel := context.with_timeout(mut &background, time.second)
defer {
cancel()
}
ctx2 := context.background()
mut ctx, _ := merge(ctx1, ctx2)
if deadline := ctx.deadline() {
assert deadline.unix_time() != 0
} else {
panic('this should never happen')
}
}
fn test_merge_deadline_context_2() {
mut background := context.background()
ctx1 := context.background()
mut ctx2, cancel := context.with_timeout(mut &background, time.second)
defer {
cancel()
}
mut ctx, _ := merge(ctx1, ctx2)
if deadline := ctx.deadline() {
assert deadline.unix_time() != 0
} else {
panic('this should never happen')
}
}
fn test_merge_deadline_context_n() {
mut background := context.background()
ctx1 := context.background()
mut ctxs := []context.Context{cap: 21}
for i in 0 .. 10 {
ctxs << context.background()
}
mut ctx_n, _ := context.with_timeout(mut &background, time.second)
ctxs << ctx_n
for i in 0 .. 10 {
ctxs << context.background()
}
mut ctx, cancel := merge(ctx1, ...ctxs)
assert !eventually(ctx.done())
assert ctx.err() is none
cancel()
assert eventually(ctx.done())
assert ctx.err() is Error
}
fn test_merge_deadline_none() {
ctx1 := context.background()
ctx2 := context.background()
mut ctx, _ := merge(ctx1, ctx2)
if _ := ctx.deadline() {
panic('this should never happen')
}
}
fn test_merge_cancel_two() {
ctx1 := context.background()
ctx2 := context.background()
mut ctx, cancel := merge(ctx1, ctx2)
cancel()
assert eventually(ctx.done())
assert ctx.err() is Error
assert ctx.err().str() == 'canceled context'
}
fn test_merge_cancel_multiple() {
ctx1 := context.background()
ctx2 := context.background()
ctx3 := context.background()
mut ctx, cancel := merge(ctx1, ctx2, ctx3)
cancel()
assert eventually(ctx.done())
assert ctx.err() is Error
assert ctx.err().str() == 'canceled context'
}