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server.go
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server.go
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/*
* Copyright IBM Corporation 2022
*
* 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 graph
import (
"embed"
"encoding/json"
"fmt"
"io/fs"
"net/http"
"time"
"github.com/gorilla/mux"
graphtypes "github.com/konveyor/move2kube/types/graph"
"github.com/sirupsen/logrus"
)
// content is our static web server content.
//
//go:embed web/build/*
var content embed.FS
// StartServer starts the graph server and web UI to display the nodes and edges.
func StartServer(graph graphtypes.GraphT, port int32) error {
jsonBytes, err := json.Marshal(graph)
if err != nil {
return fmt.Errorf("failed to marshal the graph to json. Error: %w", err)
}
router := mux.NewRouter()
sub, err := fs.Sub(content, "web/build")
if err != nil {
return fmt.Errorf("failed to create a filesystem from the embedded static files. Error: %w", err)
}
router.Path("/graph.json").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
if _, err := w.Write(jsonBytes); err != nil {
logrus.Errorf("failed to write the json bytes out to the response. Actual:\n%s\nError: %q", string(jsonBytes), err)
}
})
router.PathPrefix("/").Handler(http.StripPrefix("/", http.FileServer(http.FS(sub))))
addr := fmt.Sprintf("127.0.0.1:%d", port)
server := &http.Server{
Handler: router,
Addr: addr,
WriteTimeout: 15 * time.Second,
ReadTimeout: 15 * time.Second,
}
logrus.Infof("Listening on http://%s/", addr)
return server.ListenAndServe()
}