Switch dep manager from govendor to go modules (#20)

- CircleCi config is update to enable go mod support for go in ci env.
- Go modules enables project to built outside go workspace. Hence,
  build/setEnv.sh that was used for creating fake workspace is removed.
- Functionality to check if build scripts are invoked from project root
  directory is moved from build/setEnv.sh to build/ci.go
- Build scripts (build/ci.go), Readme and .gitignore are updated.

- Also, as a a result of migrating from govendor to go modules,
    - Vendor directory is no more required and hence removed.
    - go.mod and go.sum files are added to track dependencies.

Resolves #9

Signed-off-by: Manoranjith <ponraj.manoranjitha@in.bosch.com>

.circleci/config.yml

@@ -4,6 +4,8 @@ jobs:
   checkout_deps:
     docker:
       - image: circleci/golang:1.12.7-stretch
+        environment:
+            GO111MODULE: "on"
     working_directory: /go/src/github.com/direct-state-transfer/dst-go
     steps:
       - checkout
@@ -20,6 +22,7 @@ jobs:
     docker:
       - image: circleci/golang:1.12.7-stretch
     environment:
+      GO111MODULE: "on"
       TEST_RESULTS: /tmp/test-results
     working_directory: /go/src/github.com/direct-state-transfer/dst-go
     steps:
@@ -41,6 +44,8 @@ jobs:
   walkthrough_simulated:
     docker:
       - image: circleci/golang:1.12.7-stretch
+    environment:
+      GO111MODULE: "on"
     working_directory: /go/src/github.com/direct-state-transfer/dst-go
     steps:
       - restore_cache:

.gitignore

@@ -1,8 +1 @@
-#Ignore these files
-vendor/*
-build/workspace_
-
-#But not these
-!vendor/vendor.json
-
 

.golangci.yml

@@ -3,9 +3,6 @@ run:
   # include test files or not, default is true
   tests: true
 
-  skip-dirs:
-    - workspace_
-
   # default is true. Enables skipping of directories:
   #   vendor$, third_party$, testdata$, examples$, Godeps$, builtin$
   skip-dirs-use-default: true

Makefile

@@ -29,6 +29,6 @@ help:               ## display this help text
 # $(O) is meant as a shortcut for $(BUILDOPTS).
 $(__TARGETS): Makefile
 	go build -o build/build ./build
-	build/setEnv.sh build/build $@ $(BUILDOPTS) $(0)
+	build/build $@ $(BUILDOPTS) $(0)
 	rm build/build
 	@echo "Done building."

README.md

@@ -35,40 +35,30 @@ This below document explains how to start using direct state transfer software.
 
 ### Prerequisites
 
-1. Install Go (v1.10 or later)
+1. Install Go (v1.11 or later)
 2. Install Geth (v1.8.20-stable) (Optional; required only for running walkthrough)
 
 ### Build from source
 
 The following commands can be used to build and install dst-go from its source.
-Once the GOPATH and GOBIN are properly set in the local environment, following commands can be executed.
 
 ```bash
-cd $GOPATH
-cd src
-
-#create directory
-mkdir -p github.com/direct-state-transfer
-cd github.com/direct-state-transfer
-
 #clone dst-go repo
 git clone https://github.com/direct-state-transfer/dst-go.git
 cd dst-go
 
-#install govendor tool to sync vendored dependencies
-go get -u -v github.com/kardianos/govendor
-
 #sync dependencies
-#should be run inside the cloned root of the dst-go repo (~/PATH/dst-go)
-govendor sync -v
+#should be run inside the cloned root of the dst-go repo
+go mod tidy
 
 #Now navigate to dst-go module inside the repo
 cd dst-go
 #install dst-go
 go install -v
 ```
 
-dst-go is installed in the local machine and the binary will be available at the set GOBIN path.
+dst-go is installed in the local machine and the binary will be available at `$GOBIN`.
+If `$GOBIN` environement variable is not set, then it can be found at `~/go/bin`
 
 ### Build using Make
 
@@ -80,7 +70,6 @@ git clone https://github.com/direct-state-transfer/dst-go.git
 
 The available make file can be used to build dst-go from source.
 The following commands can be executed from the root repository of the project.
-(~/LOCAL_WORKSPACE/dst-go/)
 
 ```bash
 #To get a list of available build targets
@@ -89,7 +78,7 @@ make help
 make install
 ```
 
-On successful run, the binary will be available at ~/LOCAL_WORKSPACE/dst-go/build/workspace_/bin
+On successful run, the binary will be available at `$GOPATH/bin`. If `$GOPATH` environement variable is not set, then it can be found at `~/go/bin`
 
 ### Build and run walkthrough
 
@@ -106,7 +95,7 @@ This can be run with a geth node (real backend) or with the simulated backend (f
 
 1. The geth node should be configured to use port number 8546 for
    websocket connection or the geth nodes websocket port number should
-   be updated in `~/LOCAL_WORKSPACE/dst-go/testdata/test_addresses.json`
+   be updated in `<project-root-directory>/testdata/test_addresses.json`
    in the place of ethereum node url.
 
     The following shows the default test_addresses.json with some sample keys already present in the keystore which is already present in the project. Similarly the ports and ethereum addresses of alice and bob can be updated.
@@ -130,27 +119,27 @@ This can be run with a geth node (real backend) or with the simulated backend (f
     }
     ```
 
-2. The key files of the keys mentioned in the test_addresses.json for alice and bob should be present in testdata/test-keystore and the geth's keystore.
-3. Sample configuration is available at testdata with default keys and key files. To use these, simply add the key files from testdata/test-keystore directory to geth's keystore.
+2. The key files of the keys mentioned in the `test_addresses.json` for alice and bob should be present in `testdata/test-keystore` directory and the loaded in geth's keystore.
+3. Sample configuration is available at `testdata` with default keys and key files. To use these, simply add the key files from `testdata/test-keystore` directory to geth's keystore.
 4. Both Alice's and Bob's account should have minimum of 10 Ethers each to run this walkthrough. (It is currently not yet tested on mainnet.)
 5. If a local geth node is used to run the walkthrough, the mining should be activated to execute transactions.
-6. Make sure that the vendored dependencies using govendor tool are synchronized.
+6. Make sure that the dependencies are synchronized using `go mod tidy` command.
 
 #### Build and run from source
 
 Use the below commands to build and run the walkthrough from source.
 
 ```bash
-cd $GOPATH/src/github.com/direct-state-transfer/dst-go/walkthrough
+cd dst-go/walkthrough
 #build walkthrough
 go build -v
 
 #Run walkthrough
-#Initialize bob's node (should be started first) and let it run..
+#Initialize bob's node (should be started first) and let it run.
 ./walkthrough --real_backend_bob
 
 #Open a new terminal and go to walkthrough dir
-cd $GOPATH/src/github.com/direct-state-transfer/dst-go/walkthrough
+cd dst-go/walkthrough
 
 #Initialize alice's node and commence walkthrough
 ./walkthrough --real_backend_alice
@@ -183,8 +172,8 @@ In test mode short, all the unit tests will be performed using the simulated bac
 ```bash
 # To run all the tests
 make test
-# All options supported by go test command can be passed via testOpts
-# option as shown below.
+# All options supported by go test command can be passed via BUILDOPTS
+# as shown below.
 # Some flags will be enabled by default (-cover and cache=1). Output is
 # non verbose by default.
 make test BUILDOPTS="-v -short"

build/ci.go

@@ -18,30 +18,56 @@ package main
 
 import (
 	"fmt"
+	"go/build"
 	"os"
 	"os/exec"
+	"path"
 	"path/filepath"
 	"runtime"
 	"strings"
 )
 
-var tempGoPath, tempProjectRoot string
+var goPath, goBin, projectRootDir string
 
 var (
 	requiredGoVersionMajor = uint8(1)  //Go1.x Required
-	minimumGoVersionMinor  = uint8(10) //Go1.10 Minimum
+	minimumGoVersionMinor  = uint8(11) //Go1.11 Minimum
 )
 
 func main() {
 
+	var err error
+	var workingDir string
+
+	_, programFilePath, _, ok := runtime.Caller(0)
+	if !ok {
+		fmt.Printf("Error in fetching caller information : %s\n", err)
+		os.Exit(1)
+	}
+
+	projectRootDir = path.Dir(path.Dir(programFilePath))
+
+	workingDir, err = os.Getwd()
+	if err != nil {
+		fmt.Printf("Error in fetching current working directory : %s\n", err)
+		os.Exit(1)
+	}
+
+	if projectRootDir != workingDir {
+		fmt.Printf("Error - Program can only be invoked from project root directory\n")
+		os.Exit(1)
+	}
+
 	if len(os.Args) < 1 {
 		fmt.Println("No commands to execute")
 	}
 
-	tempGoPath = os.Getenv("GOPATH")
-	tempProjectRoot = os.Getenv("GOPATH") + os.Getenv("DST_GO_PATH")
+	//the variable from build package gives the proper gopath
+	//from environment variables if set, else default value (~/go)
+	goPath = build.Default.GOPATH
+	goBin = filepath.Join(goPath, "bin")
 
-	err := checkGoEnv(requiredGoVersionMajor, minimumGoVersionMinor)
+	err = checkGoEnv(requiredGoVersionMajor, minimumGoVersionMinor)
 	if err != nil {
 		fmt.Printf("Error in go environment : %s\n", err)
 		os.Exit(1)
@@ -59,7 +85,6 @@ func main() {
 		os.Exit(1)
 	}
 
-	// documentation of commands in doc.go
 	switch os.Args[1] {
 	case "fetchDependencies":
 		fetchVendoredPackages()
@@ -88,8 +113,8 @@ func main() {
 		runWalkthrough(os.Args[2:])
 
 	case "lint":
-		fetchVendoredPackages()
-		performLint()
+		// fetchVendoredPackages()
+		performLint(os.Args[2:])
 	}
 }
 
@@ -99,22 +124,13 @@ func installDependencies() (err error) {
 	fmt.Println("                  Installing Dependencies                 ")
 	fmt.Println("----------------------------------------------------------")
 
-	fmt.Printf("\ngovendor...\t")
-	cmd := exec.Command("go", "get", "-u", "-v", "github.com/kardianos/govendor")
-	output, err := cmd.CombinedOutput()
-	if err != nil {
-		return fmt.Errorf("failed. Below errors are reported\n\n%s", output)
-	}
-	fmt.Printf("Successful")
-
 	fmt.Printf("\ngolangci-lint v1.21.0...\t")
 
-	tempGoBin := filepath.Join(tempGoPath, "bin")
 	outputByteArr, err := pipe(
 		// #nosec G204. To suppress gosec linter warning. The below command is safe to use.
 		exec.Command("curl", "-sfL", "https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh"),
 		// #nosec G204. To suppress gosec linter warning. The below command is safe to use.
-		exec.Command("sh", "-s", "--", "-b", tempGoBin, "v1.21.0"),
+		exec.Command("sh", "-s", "--", "-b", goBin, "v1.21.0"),
 	)
 	if err != nil {
 		return fmt.Errorf("failed. Below errors are reported\n\n%s", outputByteArr.String())
@@ -140,9 +156,6 @@ func checkGoEnv(requiredGoVersionMajor, minimumGoVersionMinor uint8) (err error)
 	if goVersionMinor < minimumGoVersionMinor {
 		return fmt.Errorf("detected go version - %s. Minor version atleast %d required", goVersion, minimumGoVersionMinor)
 	}
-	if tempGoPath == "" {
-		return fmt.Errorf("gopath not found")
-	}
 
 	return nil
 }
@@ -151,50 +164,16 @@ func fetchVendoredPackages() {
 	fmt.Printf("\n----------------------------------------------------------\n")
 	fmt.Println("                Fetching vendored libraries                  ")
 	fmt.Printf("---------------------------------------------------------- \n\n")
-	var filesList []string
 	var err error
 
-	//Delete all the existing vendored files
-	root := filepath.Join(tempProjectRoot, "vendor")
-	var vendorFile os.FileInfo
-	if vendorFile, err = os.Stat(root); os.IsNotExist(err) || !vendorFile.IsDir() {
-		fmt.Println("Vendor directory missing or it is a file")
-		os.Exit(1)
-	}
-	_ = filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
-		if info.Name() != "vendor.json" && info.Name() != "vendor" {
-			filesList = append(filesList, path)
-		}
-		return nil
-	})
-
-	cmd := exec.Command("rm", "-rf")
-	cmd.Args = append(cmd.Args, filesList...)
-	err = cmd.Run()
-	if err != nil {
-		fmt.Println("Delete existing vendored packages failed - ", err)
-		os.Exit(1)
-	}
-
-	//Fetch vendored libraries using tool
+	//Add missing and remove unnecessary dependencies.
 	// #nosec G204. To suppress gosec linter warning. The below command is safe to use.
-	cmd = exec.Command(filepath.Join(tempGoPath, "/bin/govendor"), "sync", "-v")
+	cmd := exec.Command("go", "mod", "tidy", "-v")
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	err = cmd.Run()
 	if err != nil {
-		fmt.Println("Govendor sync failed - ", err)
-		os.Exit(1)
-	}
-
-	//Print the status of vendored libraries
-	// #nosec G204. To suppress gosec linter warning. The below command is safe to use.
-	cmd = exec.Command(filepath.Join(tempGoPath, "/bin/govendor"), "list")
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
-	err = cmd.Run()
-	if err != nil {
-		fmt.Println("Govendor list failed - ", err)
+		fmt.Println("go mod tidy failed with error - ", err)
 		os.Exit(1)
 	}
 }
@@ -227,7 +206,7 @@ func install() {
 		fmt.Println("Build failed - ", err)
 		os.Exit(1)
 	}
-	fmt.Println("Installed successfully at", (filepath.Join(tempGoPath, "/bin/dst-go")))
+	fmt.Println("Installed successfully at", (filepath.Join(goPath, "/bin/dst-go")))
 }
 
 //run unit tests for all packages
@@ -269,7 +248,8 @@ func buildWalkthrough() {
 	fmt.Printf("\n----------------------------------------------------------\n")
 	fmt.Println("                   Building Walkthrough                   ")
 	fmt.Printf("---------------------------------------------------------- \n\n")
-	cmd := exec.Command("go", "build", "-o", "./walkthrough/walkthrough", "-v", "./walkthrough")
+	cmd := exec.Command("go", "build", "-v")
+	cmd.Dir = filepath.Join(projectRootDir, "walkthrough")
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 	err := cmd.Run()
@@ -290,7 +270,7 @@ func runWalkthrough(flags []string) {
 
 	cmd := exec.Command("./walkthrough")
 	cmd.Args = append(cmd.Args, flags...)
-	cmd.Dir = tempProjectRoot + "walkthrough"
+	cmd.Dir = filepath.Join(projectRootDir, "walkthrough")
 	cmd.Stdout = os.Stdout
 	cmd.Stderr = os.Stderr
 
@@ -302,7 +282,7 @@ func runWalkthrough(flags []string) {
 }
 
 //perform Lint
-func performLint() {
+func performLint(flags []string) {
 
 	fmt.Println("----------------------------------------------------------")
 	fmt.Println("                     Linting the code                     ")
@@ -311,13 +291,15 @@ func performLint() {
 
 	// Configuration is fetched from the file .golangci.yml in project root directory.
 	// #nosec G204. To suppress gosec linter warning. The below command is safe to use.
-	cmd := exec.Command(filepath.Join(tempGoPath, "/bin/golangci-lint"), "run", "./...")
-	cmd.Dir = tempProjectRoot
+	cmd := exec.Command(filepath.Join(goBin, "golangci-lint"), "run", "./...")
+	cmd.Args = append(cmd.Args, flags...)
+	cmd.Dir = projectRootDir
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		fmt.Printf("Failed. Below warnings and errors are reported\n\n%s\n", output)
 		os.Exit(1)
 	} else {
+		fmt.Printf("\n%s\n", output)
 		fmt.Printf("Successful. No errors detected\n")
 	}
 }