afb-api-js: first step for javascript bindingssandbox/jobol/jsapi

Adds the javascript interpreter duktape 2.3.0
for bindings written in javascript.

This is a first integration. Much more work has to be
done for fully providing an interesting feature.

The option --jsapi allows to load a file that
contains javascript. It exports its verbs using

 exports.verbname = function(req, args) ...

where req is the opaque request object and args
is the object representing arguments as returned
by afb_req_json.

The available functions are:
 - require(path) module load (ex system = require("afb:system"))
 - afb_req_success(req, result, info)
 - afb_req_fail(req, status, info)
 - result = afb_req_subcall(req, api, verb, args)

Change-Id: I9e6f14acf3c291ce6a56a1fe88e93afbc4089106
Signed-off-by: José Bollo <jose.bollo@iot.bzh>

1 files changed, 28 insertions, 0 deletions

diff --git a/jsapi/js-hello.js b/jsapi/js-hello.js
new file mode 100644
index 00000000..c6c41dfc
--- /dev/null
+++ b/jsapi/js-hello.js
@@ -0,0 +1,28 @@
+var counter = 0;
+
+exports.ping = function(req, args) {
+
+	afb_req_success(req, args, String(++counter));
+};
+
+exports.fail = function(req, args) {
+
+	afb_req_fail(req, "fail", String(++counter));
+};
+
+exports.subcall = function(req, args) {
+
+	if (!args.api || !args.verb)
+		afb_req_fail(req, "bad-args", String(++counter));
+	else {
+		var x = afb_req_subcall_sync(req, args.api, args.verb, args.args);
+		if (!x)
+			afb_req_fail(req, "null-answer", String(++counter));
+		else if (x.request.status == "success")
+			afb_req_success(req, x.response, String(++counter));
+		else
+			afb_req_fail(req, x.request.status, String(++counter));
+	}
+};
+
+