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ttl.go
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ttl.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package http
import (
"context"
"fmt"
"strconv"
"time"
"go.uber.org/yarpc/api/transport"
"go.uber.org/yarpc/internal/errors"
)
// parseTTL takes a context parses the given TTL, clamping the context to that
// TTL and as a side-effect, tracking any errors encountered while attempting
// to parse and validate that TTL.
//
// Leaves the context unchanged if the TTL is empty.
func parseTTL(ctx context.Context, req *transport.Request, ttl string) (_ context.Context, cancel func(), _ error) {
if ttl == "" {
return ctx, func() {}, nil
}
ttlms, err := strconv.Atoi(ttl)
if err != nil {
return ctx, func() {}, invalidTTLError{
Service: req.Service,
Procedure: req.Procedure,
TTL: ttl,
}
}
// negative TTLs are invalid
if ttlms < 0 {
return ctx, func() {}, invalidTTLError{
Service: req.Service,
Procedure: req.Procedure,
TTL: fmt.Sprint(ttlms),
}
}
ctx, cancel = context.WithTimeout(ctx, time.Duration(ttlms)*time.Millisecond)
return ctx, cancel, nil
}
// invalidTTLError is a failure to process a request because the TTL was in an
// invalid format.
type invalidTTLError struct {
Service string
Procedure string
TTL string
}
func (e invalidTTLError) AsHandlerError() errors.HandlerError {
return errors.HandlerBadRequestError(e)
}
func (e invalidTTLError) Error() string {
return fmt.Sprintf(
`invalid TTL %q for procedure %q of service %q: must be positive integer`,
e.TTL, e.Procedure, e.Service,
)
}