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buildserver.go
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buildserver.go
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/*
Copyright IBM Corp All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package nwo
import (
"context"
"fmt"
"net"
"net/http"
"strings"
"sync"
"time"
"github.com/hyperledger/fabric/integration/helpers"
. "github.com/onsi/gomega"
"github.com/onsi/gomega/gexec"
)
type BuildServer struct {
server *http.Server
lis net.Listener
}
func NewBuildServer(args ...string) *BuildServer {
return &BuildServer{
server: &http.Server{
Handler: &buildHandler{args: args},
},
}
}
func (s *BuildServer) Serve() {
lis, err := net.Listen("tcp", "127.0.0.1:0")
Expect(err).NotTo(HaveOccurred())
s.lis = lis
go s.server.Serve(lis)
}
func (s *BuildServer) Shutdown() {
ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
defer cancel()
defer gexec.CleanupBuildArtifacts()
s.server.Shutdown(ctx)
}
func (s *BuildServer) Components() *Components {
Expect(s.lis).NotTo(BeNil())
helpers.AssertImagesExist(RequiredImages...)
return &Components{
ServerAddress: s.lis.Addr().String(),
}
}
type artifact struct {
mutex sync.Mutex
input string
output string
}
func (a *artifact) build(args ...string) error {
a.mutex.Lock()
defer a.mutex.Unlock()
if a.output != "" {
return nil
}
output, err := gexec.Build(a.input, args...)
if err != nil {
return err
}
a.output = output
return nil
}
type buildHandler struct {
mutex sync.Mutex
artifacts map[string]*artifact
args []string
}
func (b *buildHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method != http.MethodGet {
w.WriteHeader(http.StatusBadRequest)
return
}
input := strings.TrimPrefix(req.URL.Path, "/")
a := b.artifact(input)
if err := a.build(b.args...); err != nil {
w.WriteHeader(http.StatusInternalServerError)
fmt.Fprintf(w, "%s", err)
return
}
w.WriteHeader(http.StatusOK)
fmt.Fprintf(w, "%s", a.output)
}
func (b *buildHandler) artifact(input string) *artifact {
b.mutex.Lock()
defer b.mutex.Unlock()
if b.artifacts == nil {
b.artifacts = map[string]*artifact{}
}
a, ok := b.artifacts[input]
if !ok {
a = &artifact{input: input}
b.artifacts[input] = a
}
return a
}