on-http-y1/lib/services/taskgraph-api-service.js

OnRack Http Server

// Copyright 2016, EMC, Inc.

'use strict';

var di = require('di');
var grpc = require('grpc');
var consul = require('consul');

module.exports = taskgraphApiServiceFactory;
di.annotate(taskgraphApiServiceFactory, new di.Provide('Http.Services.Api.Taskgraph.Scheduler'));
di.annotate(taskgraphApiServiceFactory,
    new di.Inject(
        'Errors',
        'Services.Configuration',
        'Promise',
        '_'
    )
);

function taskgraphApiServiceFactory(
    Errors,
    configuration,
    Promise,
    _
) {
    var protocol = grpc.load( __dirname + '/scheduler.proto').scheduler;
    var url = require('url');
    var consulUrl = configuration.get('consulUrl');
    var urlObject = consulUrl ? url.parse(configuration.get('consulUrl')) : null;

    if (urlObject) {
        // Create a promisified Consul interface
        var consul = require('consul')({
            host: urlObject.hostname,
            port: urlObject.port || 8500,
            promisify: function(fn) {
              return new Promise(function(resolve, reject) {
                try {
                  return fn(function(err, data, res) {
                    if (err) {
                      err.res = res;
                      return reject(err);
                    }
                    return resolve([data, res]);
                  });
                } catch (err) {
                  return reject(err);
                }
              });
            }
        });
    }

    var grpcClients = {};

    function getClient() {
        return Promise.try(function() {
            if (consul) { return consul.agent.service.list(); }

            var taskGraphUrl = url.parse(
                _.get(configuration.get('taskgraphConfig'), 'url') ||
                'scheduler://127.0.0.1:31001'
            );

            return [[{
                Service: 'taskgraph',
                Tags: [ 'scheduler' ],
                Address: taskGraphUrl.hostname,
                Port: taskGraphUrl.port
            }]];
        })
        .then(function(services) {
            var scheduler = _.reduce(services[0], function(result, value) {
                if(value.Service === 'taskgraph' && _.includes(value.Tags, 'scheduler')) {
                    result.push(value);
                }
                return result;
            }, []);

            if(_.isEmpty(scheduler)) {
                var err = new Errors.BaseError('No registered service found for taskgraph scheduler'); // jshint ignore:line
                err.status = 503;
                throw err;
            }

            // TODO: cool code to rotate/pick the service, but just pick the first one for now
            var host = scheduler[0].Address + ':' + scheduler[0].Port;
            var client = grpcClients[host] ||
                new protocol.Scheduler(host, grpc.credentials.createInsecure());
            if(!grpcClients[host]) {
                grpcClients[host] = client;
            }
            return client;
        });
    }

    function runRpc(funcName) {
        var _arguments = Array.prototype.slice.call(arguments);
        var args = _arguments.slice(1);
        return getClient()
        .then(function(client) {
            return new Promise(function(resolve, reject) {
                args.push(function(err, response) {
                    if(err) {
                        return reject(err);
                    }
                    resolve(response);
                });
                client[funcName].apply(client, args);
            });
        })
        .then(function(response) {
            var responseObj;
            try {
                responseObj = JSON.parse(response.response);
            } catch(err) {
                responseObj = null;
            }

            if (responseObj && responseObj.context && responseObj.context.status > 299) {
                throw new Errors[responseObj.name](responseObj.message);
            }
            return JSON.parse(response.response);
        });
    }

    function TaskgraphApiService() {
    }

    TaskgraphApiService.prototype.getBootstrap = function() {
    };

    TaskgraphApiService.prototype.getTasksById = function(identifier) {
        return runRpc('getTasksById', {
            identifier: identifier
        });
    };

    TaskgraphApiService.prototype.postTaskById = function(identifier, body) {
        return runRpc('postTaskById', {
            identifier: identifier,
            config: JSON.stringify(body)
        });
    };

    TaskgraphApiService.prototype.workflowsGetGraphs = function() {
        return runRpc('workflowsGetGraphs', {});
    };

    TaskgraphApiService.prototype.workflowsGetGraphsByName = function(injectableName) {
        return runRpc('workflowsGetGraphsByName', {
            injectableName: injectableName
        });
    };

    TaskgraphApiService.prototype.workflowsPutGraphs = function(definition) {
        return runRpc('workflowsPutGraphs', {
            definition: JSON.stringify(definition)
        });
    };

    TaskgraphApiService.prototype.workflowsDeleteGraphsByName = function(injectableName) {
        return runRpc('workflowsDeleteGraphsByName', {
            injectableName: injectableName
        });
    };

    TaskgraphApiService.prototype.workflowsGet = function(query) {
        return runRpc('workflowsGet', { 
            query: JSON.stringify(query) 
        });
    };

    TaskgraphApiService.prototype.workflowsPost = function(config, nodeId) {
        return runRpc('workflowsPost', {
            nodeId: nodeId, 
            configuration: JSON.stringify(config)
        });
    };

    TaskgraphApiService.prototype.workflowsGetByInstanceId = function(graphName) {
        return runRpc('workflowsGetByInstanceId', {
            graphName: graphName
        });
    };

    TaskgraphApiService.prototype.workflowsAction = function(graphId, command) {
        return runRpc('workflowsAction', {
            command: command, 
            identifier: graphId
        });
    };

    TaskgraphApiService.prototype.workflowsDeleteByInstanceId = function(graphId) {
        return runRpc('workflowsDeleteByInstanceId', {
            graphId: graphId
        });
    };

    TaskgraphApiService.prototype.workflowsPutTask = function(definition) {
        return runRpc('workflowsPutTask', {
            definition: JSON.stringify(definition)
        });
    };

    TaskgraphApiService.prototype.workflowsGetAllTasks = function() {
        return runRpc('workflowsGetAllTasks', {});
    };

    TaskgraphApiService.prototype.workflowsGetTasksByName = function(injectableName) {
        return runRpc('workflowsGetTasksByName', {
            injectableName: injectableName
        });
    };

    TaskgraphApiService.prototype.workflowsDeleteTasksByName = function(injectableName) {
        return runRpc('workflowsDeleteTasksByName', {
            injectableName: injectableName
        });
    };

    return new TaskgraphApiService();
}