fn: support for functions testing (#379)

* fn: add test framework

* fn: make routes creation smarter

* fn: add testframework examples

* fn: remove unnecessary dependency

* fn: update doc

* fn: fix consistenty between runff, runlocaltest and runremotetest

fn/run.go

@@ -3,6 +3,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"strings"
@@ -46,12 +47,16 @@ func (r *runCmd) run(c *cli.Context) error {
 		image = ff.FullName()
 	}
 
+	return runff(image, stdin(), os.Stdout, os.Stderr, c.StringSlice("e"))
+}
+
+func runff(image string, stdin io.Reader, stdout, stderr io.Writer, restrictedEnv []string) error {
 	sh := []string{"docker", "run", "--rm", "-i"}
 
 	var env []string
 	detectedEnv := os.Environ()
-	if se := c.StringSlice("e"); len(se) > 0 {
-		detectedEnv = se
+	if len(restrictedEnv) > 0 {
+		detectedEnv = restrictedEnv
 	}
 
 	for _, e := range detectedEnv {
@@ -67,26 +72,9 @@ func (r *runCmd) run(c *cli.Context) error {
 
 	sh = append(sh, image)
 	cmd := exec.Command(sh[0], sh[1:]...)
-	// Check if stdin is being piped, and if not, create our own pipe with nothing in it
-	// http://stackoverflow.com/questions/22744443/check-if-there-is-something-to-read-on-stdin-in-golang
-	stat, err := os.Stdin.Stat()
-	if err != nil {
-		// On Windows, this gets an error if nothing is piped in.
-		// If something is piped in, it works fine.
-		// Turns out, this works just fine in our case as the piped stuff works properly and the non-piped doesn't hang either.
-		// See: https://github.com/golang/go/issues/14853#issuecomment-260170423
-		// log.Println("Warning: couldn't stat stdin, you are probably on Windows. Be sure to pipe something into this command, eg: 'echo \"hello\" | fn run'")
-	} else {
-		if (stat.Mode() & os.ModeCharDevice) == 0 {
-			// log.Println("data is being piped to stdin")
-			cmd.Stdin = os.Stdin
-		} else {
-			// log.Println("stdin is from a terminal")
-			cmd.Stdin = strings.NewReader("")
-		}
-	}
-	cmd.Stdout = os.Stdout
-	cmd.Stderr = os.Stderr
+	cmd.Stdin = stdin
+	cmd.Stdout = stdout
+	cmd.Stderr = stderr
 	cmd.Env = env
 	return cmd.Run()
 }