mirror of
https://github.com/caddyserver/xcaddy.git
synced 2024-09-07 13:09:15 +01:00
Technically they are packages to be imported, not necessarily paths to the containing Go module.
267 lines
6.9 KiB
Go
267 lines
6.9 KiB
Go
// Copyright 2020 Matthew Holt
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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 xcaddy
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import (
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"bytes"
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"context"
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"fmt"
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"html/template"
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"io/ioutil"
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"log"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"time"
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)
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func (b Builder) newEnvironment(ctx context.Context) (*environment, error) {
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// assume Caddy v2 if no semantic version is provided
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caddyModulePath := defaultCaddyModulePath
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if !strings.HasPrefix(b.CaddyVersion, "v") || !strings.Contains(b.CaddyVersion, ".") {
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caddyModulePath += "/v2"
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}
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caddyModulePath, err := versionedModulePath(caddyModulePath, b.CaddyVersion)
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if err != nil {
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return nil, err
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}
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// clean up any SIV-incompatible module paths real quick
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for i, p := range b.Plugins {
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b.Plugins[i].PackagePath, err = versionedModulePath(p.PackagePath, p.Version)
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if err != nil {
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return nil, err
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}
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}
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// create the context for the main module template
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tplCtx := goModTemplateContext{
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CaddyModule: caddyModulePath,
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}
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for _, p := range b.Plugins {
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tplCtx.Plugins = append(tplCtx.Plugins, p.PackagePath)
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}
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// evaluate the template for the main module
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var buf bytes.Buffer
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tpl, err := template.New("main").Parse(mainModuleTemplate)
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if err != nil {
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return nil, err
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}
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err = tpl.Execute(&buf, tplCtx)
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if err != nil {
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return nil, err
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}
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// create the folder in which the build environment will operate
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tempFolder, err := newTempFolder()
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if err != nil {
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return nil, err
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}
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defer func() {
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if err != nil {
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err2 := os.RemoveAll(tempFolder)
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if err2 != nil {
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err = fmt.Errorf("%w; additionally, cleaning up folder: %v", err, err2)
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}
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}
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}()
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log.Printf("[INFO] Temporary folder: %s", tempFolder)
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// write the main module file to temporary folder
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mainPath := filepath.Join(tempFolder, "main.go")
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log.Printf("[INFO] Writing main module: %s", mainPath)
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err = ioutil.WriteFile(mainPath, buf.Bytes(), 0644)
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if err != nil {
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return nil, err
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}
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env := &environment{
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caddyVersion: b.CaddyVersion,
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plugins: b.Plugins,
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caddyModulePath: caddyModulePath,
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tempFolder: tempFolder,
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timeoutGoGet: b.TimeoutGet,
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skipCleanup: b.SkipCleanup,
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}
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// initialize the go module
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log.Println("[INFO] Initializing Go module")
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cmd := env.newCommand("go", "mod", "init", "caddy")
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err = env.runCommand(ctx, cmd, 10*time.Second)
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if err != nil {
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return nil, err
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}
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// specify module replacements before pinning versions
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replaced := make(map[string]string)
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for _, r := range b.Replacements {
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log.Printf("[INFO] Replace %s => %s", r.Old, r.New)
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cmd := env.newCommand("go", "mod", "edit",
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"-replace", fmt.Sprintf("%s=%s", r.Old, r.New))
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err := env.runCommand(ctx, cmd, 10*time.Second)
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if err != nil {
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return nil, err
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}
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replaced[r.Old] = r.New
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}
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// check for early abort
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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// pin versions by populating go.mod, first for Caddy itself and then plugins
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log.Println("[INFO] Pinning versions")
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err = env.execGoGet(ctx, caddyModulePath, env.caddyVersion)
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if err != nil {
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return nil, err
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}
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nextPlugin:
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for _, p := range b.Plugins {
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// if module is locally available, do not "go get" it;
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// also note that we iterate and check prefixes, because
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// a plugin package may be a subfolder of a module, i.e.
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// foo/a/plugin is within module foo/a.
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for repl := range replaced {
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if strings.HasPrefix(p.PackagePath, repl) {
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continue nextPlugin
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}
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}
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err = env.execGoGet(ctx, p.PackagePath, p.Version)
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if err != nil {
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return nil, err
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}
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// check for early abort
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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default:
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}
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}
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log.Println("[INFO] Build environment ready")
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return env, nil
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}
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type environment struct {
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caddyVersion string
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plugins []Dependency
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caddyModulePath string
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tempFolder string
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timeoutGoGet time.Duration
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skipCleanup bool
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}
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// Close cleans up the build environment, including deleting
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// the temporary folder from the disk.
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func (env environment) Close() error {
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if env.skipCleanup {
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log.Printf("[INFO] Skipping cleanup as requested; leaving folder intact: %s", env.tempFolder)
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return nil
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}
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log.Printf("[INFO] Cleaning up temporary folder: %s", env.tempFolder)
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return os.RemoveAll(env.tempFolder)
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}
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func (env environment) newCommand(command string, args ...string) *exec.Cmd {
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cmd := exec.Command(command, args...)
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cmd.Dir = env.tempFolder
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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return cmd
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}
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func (env environment) runCommand(ctx context.Context, cmd *exec.Cmd, timeout time.Duration) error {
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log.Printf("[INFO] exec (timeout=%s): %+v ", timeout, cmd)
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if timeout > 0 {
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var cancel context.CancelFunc
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ctx, cancel = context.WithTimeout(ctx, timeout)
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defer cancel()
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}
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// start the command; if it fails to start, report error immediately
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err := cmd.Start()
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if err != nil {
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return err
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}
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// wait for the command in a goroutine; the reason for this is
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// very subtle: if, in our select, we do `case cmdErr := <-cmd.Wait()`,
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// then that case would be chosen immediately, because cmd.Wait() is
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// immediately available (even though it blocks for potentially a long
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// time, it can be evaluated immediately). So we have to remove that
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// evaluation from the `case` statement.
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cmdErrChan := make(chan error)
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go func() {
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cmdErrChan <- cmd.Wait()
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}()
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// unblock either when the command finishes, or when the done
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// channel is closed -- whichever comes first
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select {
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case cmdErr := <-cmdErrChan:
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// process ended; report any error immediately
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return cmdErr
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case <-ctx.Done():
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// context was canceled, either due to timeout or
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// maybe a signal from higher up canceled the parent
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// context; presumably, the OS also sent the signal
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// to the child process, so wait for it to die
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select {
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case <-time.After(15 * time.Second):
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cmd.Process.Kill()
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case <-cmdErrChan:
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}
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return ctx.Err()
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}
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}
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func (env environment) execGoGet(ctx context.Context, modulePath, moduleVersion string) error {
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mod := modulePath
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if moduleVersion != "" {
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mod += "@" + moduleVersion
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}
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cmd := env.newCommand("go", "get", "-d", "-v", mod)
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return env.runCommand(ctx, cmd, env.timeoutGoGet)
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}
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type goModTemplateContext struct {
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CaddyModule string
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Plugins []string
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}
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const mainModuleTemplate = `package main
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import (
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caddycmd "{{.CaddyModule}}/cmd"
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// plug in Caddy modules here
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_ "{{.CaddyModule}}/modules/standard"
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{{- range .Plugins}}
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_ "{{.}}"
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{{- end}}
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)
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func main() {
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caddycmd.Main()
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}
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`
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