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interruptablejob.go
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/
interruptablejob.go
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/*
* Copyright 2020 National Library of Norway.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package server
import (
"context"
browsercontrollerV1 "github.com/nlnwa/veidemann-api/go/browsercontroller/v1"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"time"
)
func Send(fn func(*browsercontrollerV1.DoReply) error, reply *browsercontrollerV1.DoReply) error {
return DoWithTimeout(func() error { return fn(reply) }, 5*time.Second)
}
func Recv(ctx context.Context, fn func() (*browsercontrollerV1.DoRequest, error)) (*browsercontrollerV1.DoRequest, error) {
var result *browsercontrollerV1.DoRequest
var err error
done := make(chan interface{})
go func() {
result, err = fn()
close(done)
}()
select {
case <-ctx.Done():
return result, ctx.Err()
case <-done:
return result, err
}
}
// DoWithTimeout runs f and returns its error. If the deadline d elapses first,
// it returns a grpc DeadlineExceeded error instead.
func DoWithTimeout(f func() error, d time.Duration) error {
errChan := make(chan error, 1)
go func() {
errChan <- f()
close(errChan)
}()
t := time.NewTimer(d)
select {
case <-t.C:
return status.Errorf(codes.DeadlineExceeded, "too slow")
case err := <-errChan:
if !t.Stop() {
<-t.C
}
return err
}
}
// DoWithContext runs f and returns its error. If the context is cancelled or
// times out first, it returns the context's error instead.
func DoWithContext(ctx context.Context, f func() error) error {
errChan := make(chan error, 1)
go func() {
errChan <- f()
close(errChan)
}()
select {
case <-ctx.Done():
return ctx.Err()
case err := <-errChan:
return err
}
}