= NodeMSH: A NodeJS implementation of Micro Service Shell

In http://asciidoctor.org/docs/asciidoc-syntax-quick-reference/[Asciidoc] format.

:toc:

== Quick Start Examples

=== GETing POSTing PUTing and PIPEing

[source,javascript]

    var msh = require('msh'); 
    
    var h = 'localhost';
    var p = mockMshServicePort;
    var url = '/some/path';

    var callback = function(actions) {
              // Great, msh finished successfully now what?
            console.log("action 0" + JSON.stringify(actions[0]));
            console.log("action 1" + JSON.stringify(actions[1]));
            console.log("action 2" + JSON.stringify(actions[2]));
            console.log("action 3" + JSON.stringify(actions[3]));
            console.log("action 4" + JSON.stringify(actions[4]));
            console.log("action 5" + JSON.stringify(actions[5]));

              assert.equal(actions[0].type, 'http'); // every action has a type
              assert.equal(actions[0].method, 'GET'); // every http type has a method
              assert.equal(actions[1].type, 'pipe'); // this means we piped data from one action to another
              assert.equal(actions[2].statusCode, 201); // get http response status codes
              assert.equal(actions[5].response.message, 'some test data'); // put payload/response data
              assert.equal(true, actions.allOk()); // all http return code > 399
              done();
      };

      var errCallback = function(status, host, data) {
        // Oh noes! An error! Do something good to restore your Karma
      };

      var testTransformer = function(data) {return '{"message": "this was transformed from:", "oldmessage": ' + data + ' }'};
      var putData = '{"data": "putData"}';

      var host = "localhost";
      var port = 8080;

      // Here's the magic... 
      // Eh? what happened to all the nested callbacks?
      msh.init(callback, errCallback)
      .get(h, p, '/path1')
      .pipe(testTransformer)
      .post(h, p, '/path2')
      .del(h, p, '/path3')
      .get(h, p, '/path4')
      .put(h, p, '/path5', putData)
      .end();

=== Using predicates to halt execution

  var msh = require('msh');
    var h = 'localhost';
        var p = mockMshServicePort;
        var url = '/some/path';
        
       var payload = {"id":"sentiment","image":"sp_platform/uber-any","env":{"GIT_REPO_URL":"https://github.com/fuzzy-logic/sentiment.git", "DNS": "sentiment.muoncore.io"}};
        
        var errCallback = function(status, host, data) {
            console.log('errCallback status=%s, host=%s data=%s', status, host, data);
             assert.ok(false);
        };
        
        var callback = function(actions) {
            console.log('msh callback...');
           // console.dir(actions);
            
            var getStatus = actions[0].statusCode;
            var postStatus = actions[2].statusCode;
            
            console.log('action0: ' + JSON.stringify(actions[0]));
            assert.equal(200, actions[0].statusCode);
            assert.equal('http', actions[0].type);
            assert.equal('GET', actions[0].method);
            assert.ok(actions[0].response);
            
            
            console.log('action1: ' + JSON.stringify(actions[1]));
            assert.equal('stopPredicate', actions[1].type);
            assert.equal(true, actions[1].response); //predicate returned false
            
            
            console.log('action2: ' + JSON.stringify(actions[2]));
            assert.equal('http', actions[2].type);
            assert.equal('POST', actions[2].method);
            assert.equal(undefined, actions[2].response);
            
            
            done();
            
        };
    
    var predicate = function(prevAction) {
        //console.log("predicate prevAction=%s", JSON.stringify(prevAction));
        return true
    };
                                  
    console.log('msh starting...');
    msh.init(callback, errCallback).get(h, p, url, payload).stop(predicate).post(h, p, url).end();

=== Using URL Templating

            var h = 'localhost';
            var p = 80;
            var url = '/some/path';
            var url2 = '/{first}/{second}/{third}';
            
            var errCallback = function(status, host, data) {
                console.log('errCallback status=%s, host=%s data=%s', status, host, data);
            };
            
            var callback = function(actions) {
                var get1Id = actions[0].response.id;
                assert.equal(url2,  actions[2].pathTemplate);
                assert.equal('/foo/bar/' + get1Id,  actions[2].path);
                done();
                
            };
        
            var processor = function (result) {
                return {    
                    first: "foo",
                    second: "bar",
                    third: result.id // result = {id: 3}
                }
            }
            msh.init(callback, errCallback).get(h, p, url).template(processor).get(h, p, url2).end();