jochen
be92762969
The live tests reached one shared bus and assert, read and remove the mesh's own objects by their fixed names, so packages run in parallel deleted what each other read and the suite passed only one package at a time; a red suite read as noise. internal/testbus starts a server per test, linked in at the nats-server release go.mod pins, and a test holds that pin to the catalogue's bus image and to the facts snapshot's bus when there is one, so the tests never run a bus the mesh does not. The waiter test read a timing (the most connections held at one look) and now reads the state it means (the fewest held across the wait). make check runs the packages in parallel under the race detector, with a timeout.
114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
// Copyright (c) 2018, Google LLC All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package tpmutil provides common utility functions for both TPM 1.2 and TPM
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// 2.0 devices.
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package tpmutil
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import (
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"errors"
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"io"
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"os"
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"time"
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)
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// maxTPMResponse is the largest possible response from the TPM. We need to know
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// this because we don't always know the length of the TPM response, and
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// /dev/tpm insists on giving it all back in a single value rather than
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// returning a header and a body in separate responses.
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const maxTPMResponse = 4096
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// RunCommandRaw executes the given raw command and returns the raw response.
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// Does not check the response code except to execute retry logic.
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func RunCommandRaw(rw io.ReadWriter, inb []byte) ([]byte, error) {
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if rw == nil {
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return nil, errors.New("nil TPM handle")
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}
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// f(t) = (2^t)ms, up to 2s
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var backoffFac uint
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var rh responseHeader
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var outb []byte
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for {
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if _, err := rw.Write(inb); err != nil {
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return nil, err
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}
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// If the TPM is a real device, it may not be ready for reading
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// immediately after writing the command. Wait until the file
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// descriptor is ready to be read from.
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if f, ok := rw.(*os.File); ok {
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if err := poll(f); err != nil {
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return nil, err
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}
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}
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outb = make([]byte, maxTPMResponse)
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outlen, err := rw.Read(outb)
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if err != nil {
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return nil, err
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}
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// Resize the buffer to match the amount read from the TPM.
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outb = outb[:outlen]
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_, err = Unpack(outb, &rh)
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if err != nil {
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return nil, err
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}
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// If TPM is busy, retry the command after waiting a few ms.
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if rh.Res == RCRetry {
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if backoffFac < 11 {
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dur := (1 << backoffFac) * time.Millisecond
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time.Sleep(dur)
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backoffFac++
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} else {
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return nil, err
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}
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} else {
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break
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}
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}
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return outb, nil
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}
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// RunCommand executes cmd with given tag and arguments. Returns TPM response
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// body (without response header) and response code from the header. Returned
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// error may be nil if response code is not RCSuccess; caller should check
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// both.
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func RunCommand(rw io.ReadWriter, tag Tag, cmd Command, in ...interface{}) ([]byte, ResponseCode, error) {
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inb, err := packWithHeader(commandHeader{tag, 0, cmd}, in...)
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if err != nil {
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return nil, 0, err
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}
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outb, err := RunCommandRaw(rw, inb)
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if err != nil {
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return nil, 0, err
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}
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var rh responseHeader
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read, err := Unpack(outb, &rh)
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if err != nil {
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return nil, 0, err
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}
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if rh.Res != RCSuccess {
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return nil, rh.Res, nil
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}
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return outb[read:], rh.Res, nil
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}
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