started with frontend server

build/docker/frontend/Dockerfile

+# Copyright 2020 Institute for Automation of Complex Power Systems,
+# E.ON Energy Research Center, RWTH Aachen University
+#
+# This project is licensed under either of
+# - Apache License, Version 2.0
+# - MIT License
+# at your option.
+#
+# Apache License, Version 2.0:
+#
+# 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.
+#
+# MIT License:
+#
+# 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.
+
+FROM golang:1.13.8 AS fe_builder
+
+WORKDIR /clonemap
+COPY go.mod .
+COPY go.sum .
+RUN go mod download
+COPY cmd/frontend cmd/frontend
+COPY pkg/frontend pkg/frontend
+COPY pkg/common pkg/common
+COPY web web
+ENV PATH="/clonemap:${PATH}"
+RUN cd cmd/frontend; CGO_ENABLED=0 GOOS=linux go build -ldflags '-s' -o frontend; cp frontend /clonemap/
+
+FROM alpine:latest
+
+WORKDIR /root/
+#RUN apk add --update netbase ca-certificates
+COPY --from=fe_builder /clonemap/frontend . 
+COPY --from=fe_builder /clonemap/web ./web
+EXPOSE 30013
+CMD ["./frontend"]

cmd/frontend/main.go

+/*
+Copyright 2020 Institute for Automation of Complex Power Systems,
+E.ON Energy Research Center, RWTH Aachen University
+
+This project is licensed under either of
+- Apache License, Version 2.0
+- MIT License
+at your option.
+
+Apache License, Version 2.0:
+
+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.
+
+MIT License:
+
+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 main
+
+import "git.rwth-aachen.de/acs/public/cloud/mas/clonemap/pkg/frontend"
+
+func main() {
+	frontend.StartFrontend()
+	return
+}

pkg/frontend/frontend.go

+/*
+Copyright 2020 Institute for Automation of Complex Power Systems,
+E.ON Energy Research Center, RWTH Aachen University
+
+This project is licensed under either of
+- Apache License, Version 2.0
+- MIT License
+at your option.
+
+Apache License, Version 2.0:
+
+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.
+
+MIT License:
+
+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 frontend
+
+import (
+	"errors"
+	"net/http"
+	"strings"
+
+	"git.rwth-aachen.de/acs/public/cloud/mas/clonemap/pkg/common/httpreply"
+)
+
+// Frontend frontend
+type Frontend struct {
+}
+
+// StartFrontend start
+func StartFrontend() (err error) {
+	fe := &Frontend{}
+	fe.listen()
+	return
+}
+
+// handleAPI is the global handler for requests to path /api
+func (fe *Frontend) handleAPI(w http.ResponseWriter, r *http.Request) {
+	var cmapErr, httpErr error
+	// ams.logInfo.Println("Received Request: ", r.Method, " ", r.URL.EscapedPath())
+	// determine which ressource is requested and call corresponding handler
+	respath := strings.Split(r.URL.EscapedPath(), "/")
+	resvalid := false
+
+	switch len(respath) {
+	case 2:
+		resvalid = true
+
+	default:
+		cmapErr = errors.New("Resource not found")
+	}
+
+	if !resvalid {
+		httpErr = httpreply.NotFoundError(w)
+		cmapErr = errors.New("Resource not found")
+	}
+	if cmapErr != nil {
+		// ams.logError.Println(respath, cmapErr)
+	}
+	if httpErr != nil {
+		// ams.logError.Println(respath, httpErr)
+	}
+}
+
+// listen opens a http server listening and serving request
+func (fe *Frontend) listen() (err error) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/api/", fe.handleAPI)
+	mux.HandleFunc("/", http.FileServer(http.Dir("./web")).ServeHTTP)
+	s := &http.Server{
+		Addr:    ":13000",
+		Handler: mux,
+	}
+	err = s.ListenAndServe()
+	return
+}