Add builder manager support (#308)

This change orchestrates function builds.

Environments (in v2) define a builder image, just like they do a runtime image. The builder image contains a build script that's invoked with source and deployment paths (as env vars).

The buildermgr watches for environments with build images defined, and creates build deployments and services.

Functions can define source and deployment. Buildermgr watches for functions with source code (and build status == pending) and invokes the environment's builder when appropriate. It captures logs from the build and sets the build status (success/failure) and build lots into the PackageStatus.

controller/api.go

@@ -37,6 +37,7 @@ type (
 	API struct {
 		fissionClient     *tpr.FissionClient
 		storageServiceUrl string
+		builderManagerUrl string
 	}
 
 	logDBConfig struct {
@@ -56,6 +57,13 @@ func MakeAPI() (*API, error) {
 		api.storageServiceUrl = "http://storagesvc"
 	}
 
+	u = os.Getenv("BUILDER_MANAGER_URL")
+	if len(u) > 0 {
+		api.builderManagerUrl = strings.TrimSuffix(u, "/")
+	} else {
+		api.builderManagerUrl = "http://buildermgr"
+	}
+
 	return api, err
 }
 
@@ -160,6 +168,8 @@ func (api *API) Serve(port int) {
 
 	r.HandleFunc("/proxy/{dbType}", api.FunctionLogsApiPost).Methods("POST")
 	r.HandleFunc("/proxy/storage/v1/archive", api.StorageServiceProxy)
+	r.HandleFunc("/proxy/buildermgr/v1/build", api.BuilderManagerBuildProxy)
+	r.HandleFunc("/proxy/buildermgr/v1/builder", api.BuilderManagerEnvBuilderProxy)
 
 	address := fmt.Sprintf(":%v", port)
 

controller/buildermgr.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2017 The Fission Authors.
+
+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 controller
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+)
+
+func (api *API) BuilderManagerBuildProxy(w http.ResponseWriter, r *http.Request) {
+	u := api.builderManagerUrl + "/v1/build"
+	proxy, err := api._getBuilderManagerProxy(u)
+	if err != nil {
+		msg := fmt.Sprintf("Failed to establish proxy server: %v", err)
+		log.Println(msg)
+		http.Error(w, msg, 500)
+		return
+	}
+	proxy.ServeHTTP(w, r)
+}
+
+func (api *API) BuilderManagerEnvBuilderProxy(w http.ResponseWriter, r *http.Request) {
+	u := api.builderManagerUrl + "/v1/builder"
+	proxy, err := api._getBuilderManagerProxy(u)
+	if err != nil {
+		msg := fmt.Sprintf("Failed to establish proxy server: %v", err)
+		log.Println(msg)
+		http.Error(w, msg, 500)
+		return
+	}
+	proxy.ServeHTTP(w, r)
+}
+
+func (api *API) _getBuilderManagerProxy(targetUrl string) (*httputil.ReverseProxy, error) {
+	svcUrl, err := url.Parse(targetUrl)
+	if err != nil {
+		return nil, err
+	}
+	// set up proxy server director
+	director := func(req *http.Request) {
+		// only replace url Scheme and Host to remote server
+		// and leave query string intact
+		req.URL.Scheme = svcUrl.Scheme
+		req.URL.Host = svcUrl.Host
+		req.URL.Path = svcUrl.Path
+	}
+	return &httputil.ReverseProxy{
+		Director: director,
+	}, nil
+}

controller/environmentApi.go

@@ -139,6 +139,7 @@ func (a *API) EnvironmentApiUpdate(w http.ResponseWriter, r *http.Request) {
 		a.respondWithError(w, err)
 		return
 	}
+
 	a.respondWithSuccess(w, resp)
 }