doc

CloudI Quick Start

Install

Get wget and curl if you don't already have them
- (Ubuntu) sudo apt-get install wget curl
- (OSX) sudo port install wget curl

Get CloudI running (need ./configure help?):

wget --content-disposition \
    http://sourceforge.net/projects/cloudi/files/latest/download
tar zxvf cloudi-1.7.1.tar.gz
cd cloudi-1.7.1/src
./configure
make
sudo make install
cd ../..
sudo cloudi start

The CloudI integration tests are now running and consuming your available CPUs. The /usr/local/var/log/cloudi/cloudi.log file provides integration test output. You can now select a programming language below to create a CloudI service.

C

A CloudI service written in C is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example C service can be created by executing the following inside your shell:

cat << EOF > hello_world.c
#include "cloudi.h"
#include <string.h>
#include <assert.h>
static void hello_world(int const command,
                        char const * const name,
                        char const * const pattern,
                        void const * const request_info,
                        uint32_t const request_info_size,
                        void const * const request,
                        uint32_t const request_size,
                        uint32_t timeout,
                        int8_t priority,
                        char const * const trans_id,
                        char const * const pid,
                        uint32_t const pid_size,
                        void * state,
                        cloudi_instance_t * api)
{
    char const * const message = "Hello World!";
    uint32_t const message_size = strlen(message);
    cloudi_return(api, command, name, pattern, "", 0,
                  message, message_size,
                  timeout, trans_id, pid, pid_size);
}
int main(int argc, char ** argv)
{
    unsigned int thread_count;
    int result = cloudi_initialize_thread_count(&thread_count);
    assert(result == cloudi_success);
    assert(thread_count == 1);
    cloudi_instance_t api;
    result = cloudi_initialize(&api, 0, 0);
    assert(result == cloudi_success);
    result = cloudi_subscribe(&api, "hello_world/get",
                              &hello_world);
    assert(result == cloudi_success);
    result = cloudi_poll(&api, -1);
    cloudi_destroy(&api);
    return result;
}
EOF

Compile the CloudI service executable:

gcc -I/usr/local/lib/cloudi-1.7.1/api/c \
    -L/usr/local/lib/cloudi-1.7.1/api/c \
    -g -O0 -fexceptions hello_world.c -o hello_world_c -lcloudi

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):

export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/c/"},
  {file_path, "$PWD/hello_world_c"},
  {env, [{"LD_LIBRARY_PATH",
          "/usr/local/lib/cloudi-1.7.1/api/c/"},
         {"DYLD_LIBRARY_PATH",
          "/usr/local/lib/cloudi-1.7.1/api/c/"}]}]]
EOF

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/c/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex C examples are listed here.

C++

A CloudI service written in C++ is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example C++ service can be created by executing the following inside your shell:

cat << EOF > hello_world.cpp
#include "cloudi.hpp"
#include <string>
#include <cassert>
class Task
{
    public:
        Task(unsigned int const thread_index) :
            m_api(thread_index)
        {
            int result = 0;
            result = m_api.subscribe("hello_world/get",
                                     *this, &Task::hello_world);
            assert(result == CloudI::API::return_value::success);
        }

        int run()
        {
            return m_api.poll();
        }
    private:
        void hello_world(CloudI::API const & api,
                         int const command,
                         std::string const & name,
                         std::string const & pattern,
                         void const * const /*request_info*/,
                         uint32_t const /*request_info_size*/,
                         void const * const request,
                         uint32_t const request_size,
                         uint32_t timeout,
                         int8_t /*priority*/,
                         char const * const trans_id,
                         char const * const pid,
                         uint32_t const pid_size)
        {
            std::string message("Hello World!");
            api.return_(command, name, pattern, "", 0,
                        message.c_str(), message.size(),
                        timeout, trans_id, pid, pid_size);
        }
        CloudI::API m_api;
};
int main(int, char **)
{
    unsigned int const thread_count = CloudI::API::thread_count();
    assert(thread_count == 1);
    Task t(0);
    return t.run();
}
EOF

Compile the CloudI service executable:

g++ -I/usr/local/lib/cloudi-1.7.1/api/c \
    -L/usr/local/lib/cloudi-1.7.1/api/c \
    -g -O0 hello_world.cpp -o hello_world_cxx -lcloudi

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):

export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/cxx/"},
  {file_path, "$PWD/hello_world_cxx"},
  {env, [{"LD_LIBRARY_PATH",
          "/usr/local/lib/cloudi-1.7.1/api/c/"},
         {"DYLD_LIBRARY_PATH",
          "/usr/local/lib/cloudi-1.7.1/api/c/"}]}]]
EOF

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/cxx/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex C++ examples are listed here.

Elixir

A CloudI service written in Elixir is called an "internal" service because the service is ran inside the Erlang VM. The example Elixir service can be created by executing the following inside your shell:

mkdir lib
cat << EOF > lib/HelloWorld.ex
defmodule HelloWorld do

    import CloudILogger

    def cloudi_service_init(_args, _prefix, _timeout,
                            dispatcher) do
        :cloudi_service.subscribe(dispatcher, 'hello_world/get')
        {:ok, :undefined}
    end

    def cloudi_service_handle_request(_type, _name, _pattern,
                                      _requestinfo, _request,
                                      _timeout, _priority,
                                      _transid, _pid, state,
                                      _dispatcher) do
        {:reply, "Hello World!", state}
    end

    def cloudi_service_handle_info(request, state, _dispatcher) do
        log_warn('Unknown info "~p"', [request])
        {:noreply, state}
    end

    def cloudi_service_terminate(_reason, _timeout, _state) do
        :ok
    end
end
EOF
cat << EOF > mix.exs
defmodule HelloWorld.Mixfile do
    use Mix.Project

    def project do
        [app: :Elixir.HelloWorld,
         version: "1.7.1",
         elixirc_paths: ["lib/"],
         deps: []]
    end

    def application do
        [applications: [:cloudi_core]]
    end
end
EOF

Now compile the CloudI service module. If the CloudI service needed to utilize other Elixir dependencies they would be added to the mix.exs file.
```
mix compile
```
You now have a CloudI service contained within a single Elixir module that may look familiar if you remember how a GenServer behavior works. Instead of using the GenServer behavior, we are using a cloudi_service behavior which provides more features with CloudI service requests. To allow the Erlang VM to find the CloudI service Elixir module that has been compiled, it is necessary to add the current directory to the code path:
```
export PWD=`pwd`
curl -X POST -d '"'$PWD'/_build/dev/lib/Elixir.HelloWorld/ebin"' \
    http://localhost:6464/cloudi/api/rpc/code_path_add.erl
```

If Elixir isn't already in the Erlang VM code search path, add it:

curl -X POST -d '"/usr/local/lib/elixir/lib/elixir/ebin"' \
    http://localhost:6464/cloudi/api/rpc/code_path_add.erl

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/elixir/"},
  {module, 'Elixir.HelloWorld'}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/elixir/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation.

Erlang

A CloudI service written in Erlang (or using a language based on core Erlang like Elixir) is called an "internal" service because the service is ran inside the Erlang VM. The example Erlang service can be created by executing the following inside your shell:

cat << EOF > hello_world.erl
-module(hello_world).
-behaviour(cloudi_service).

%% cloudi_service callbacks
-export([cloudi_service_init/4,
         cloudi_service_handle_request/11,
         cloudi_service_handle_info/3,
         cloudi_service_terminate/3]).

-include_lib("cloudi_core/include/cloudi_logger.hrl").

-record(state,
    {
    }).

cloudi_service_init(_Args, _Prefix, _Timeout, Dispatcher) ->
    cloudi_service:subscribe(Dispatcher, "hello_world/get"),
    {ok, #state{}}.

cloudi_service_handle_request(_Type, _Name, _Pattern,
                              _RequestInfo, _Request,
                              _Timeout, _Priority,
                              _TransId, _Pid,
                              #state{} = State, _Dispatcher) ->
    {reply, <<"Hello World!">>, State}.

cloudi_service_handle_info(Request, State, _Dispatcher) ->
    ?LOG_WARN("Unknown info \"~p\"", [Request]),
    {noreply, State}.

cloudi_service_terminate(_Reason, _Timeout, #state{}) ->
    ok.
EOF

Now compile the CloudI service module. If the CloudI service needed to utilize other Erlang dependencies an Erlang/OTP .app file would be added with the same filename (see the examples for more details).
```
erlc -pz /usr/local/lib/cloudi-1.7.1/lib/cloudi_core-1.7.1/ebin \
    hello_world.erl
```
You now have a CloudI service contained within a single Erlang module that may look familiar if you remember how a gen_server behavior works. Instead of using the gen_server behavior, we are using a cloudi_service behavior which provides more features with CloudI service requests. To allow the Erlang VM to find the CloudI service Erlang module that has been compiled, it is necessary to add the current directory to the code path:
```
curl -X POST -d '"'`pwd`'"' \
    http://localhost:6464/cloudi/api/rpc/code_path_add.erl
```
Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/erlang/"},
  {module, hello_world}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/erlang/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. To get more details on CloudI Erlang integration (i.e., CloudI runtime usage with Erlang) see the examples in the source code repository. The available service configuration parameters are described in the services_add documentation. More complex Erlang examples are listed here.

Go

CloudI must be compiled and installed after using the configure argument "--enable-go-support" before attempting the Go quickstart below:

A CloudI service written in Go is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example Go service can be created by executing the following inside your shell:

mkdir -p src/hello_world_go/vendor/
cp -rf /usr/local/lib/cloudi-1.7.1/api/go/cloudi src/hello_world_go/vendor/
cp -rf /usr/local/lib/cloudi-1.7.1/api/go/erlang src/hello_world_go/vendor/
cat << EOF > src/hello_world_go/main.go
package main

import (
    "cloudi"
    "os"
    "sync"
)

func helloWorld(requestType int, name, pattern string, requestInfo, request []byte, timeout uint32, priority int8, transId [16]byte, pid cloudi.Source, state interface{}, api *cloudi.Instance) ([]byte, []byte, error) {
    return nil, []byte("Hello World!"), nil
}

func task(threadIndex uint32, execution *sync.WaitGroup) {
    defer execution.Done()
    api, err := cloudi.API(threadIndex, nil)
    if err != nil {
        cloudi.ErrorWrite(os.Stderr, err)
        return
    }
    err = api.Subscribe("hello_world/get", helloWorld)
    if err != nil {
        cloudi.ErrorWrite(os.Stderr, err)
        return
    }
    _, err = api.Poll(-1)
    if err != nil {
        cloudi.ErrorWrite(os.Stderr, err)
    }
}

func main() {
    threadCount, err := cloudi.ThreadCount()
    if err != nil {
        cloudi.ErrorExit(os.Stderr, err)
    }
    var execution sync.WaitGroup
    for threadIndex := uint32(0); threadIndex < threadCount; threadIndex++ {
        execution.Add(1)
        go task(threadIndex, &execution)
    }
    execution.Wait()
}
EOF

Compile the CloudI service executable:

mkdir -p bin
GOPATH=`pwd` GOBIN=$GOPATH/bin go install -x hello_world_go

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/go/"},
  {file_path, "$PWD/bin/hello_world_go"}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/go/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex Go examples are listed here.

Java

A CloudI service written in Java is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example Java service can be created by executing the following inside your shell:

mkdir -p org/cloudi/tests/hello_world/
cat << EOF > org/cloudi/tests/hello_world/Main.java
package org.cloudi.tests.hello_world;

import org.cloudi.API;

public class Main
{
    public static void main(String[] args)
    {
        try
        {
            final int thread_count = API.thread_count();
            assert(thread_count == 1);
            Task t = new Task(0);
            t.run();
        }
        catch (API.InvalidInputException e)
        {
            e.printStackTrace(API.err);
        }
    }
}
EOF
cat << EOF > org/cloudi/tests/hello_world/Task.java
package org.cloudi.tests.hello_world;

import com.ericsson.otp.erlang.OtpErlangPid;
import org.cloudi.API;

public class Task
{
    private API api;

    public Task(final int thread_index)
    {
        try
        {
            this.api = new API(thread_index);
        }
        catch (API.InvalidInputException e)
        {
            e.printStackTrace(API.err);
            System.exit(1);
        }
        catch (API.MessageDecodingException e)
        {
            e.printStackTrace(API.err);
            System.exit(1);
        }
        catch (API.TerminateException e)
        {
            System.exit(1);
        }
    }

    public Object hello_world(Integer command,
                              String name, String pattern,
                              byte[] request_info,
                              byte[] request,
                              Integer timeout, Byte priority,
                              byte[] trans_id, OtpErlangPid pid)
    {
        return ("Hello World!").getBytes();
    }

    public void run()
    {
        try
        {
            this.api.subscribe("hello_world/get",
                               this, "hello_world");
            this.api.poll();
        }
        catch (API.TerminateException e)
        {
        }
        catch (Exception e)
        {
            e.printStackTrace(API.err);
        }
    }
}

EOF
cat << EOF > manifest.txt
Main-Class: org.cloudi.tests.hello_world.Main
Class-Path: /usr/local/lib/cloudi-1.7.1/api/java/cloudi.jar

EOF

Compile the CloudI service jar:

cd org/cloudi/tests/hello_world/
CLASSPATH=/usr/local/lib/cloudi-1.7.1\
/api/java/cloudi.jar:${CLASSPATH} javac Task.java Main.java
cd ../../../../
jar cvfm hello_world.jar manifest.txt org

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):

export JAVA=`which java`
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/java/"},
  {file_path, "$JAVA"},
  {args, "-cp /usr/local/lib/cloudi-1.7.1/api/java/ "
         "-ea:org.cloudi... -jar $PWD/hello_world.jar"}]]
EOF

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/java/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex Java examples are listed here.

JavaScript

A CloudI service written in JavaScript is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example JavaScript service can be created by executing the following inside your shell:

cat << EOF > hello_world.js
var CloudI = require('/usr/local/lib/cloudi-1.7.1/' +
                     'api/javascript/CloudI.js').CloudI;
var assert = require('assert');

Task = function Task (thread_index) {
    var Task = this;
    Task._thread_index = thread_index;
};
Task.prototype.run = function () {
    var Task = this;
    try {
        new CloudI.API(Task._thread_index, function (api) {
        Task._api = api;
        Task._api.subscribe('hello_world/get', Task,
                            Task.hello_world,
                            function () {
        Task._api.poll(function (timeout) {
        });
        });});
    }
    catch (err) {
        if (typeof err.stack !== 'undefined') {
            process.stderr.write(err.stack + '\n');
        }
        else {
            process.stderr.write(err + '\n');
        }
    }
};
Task.prototype.hello_world = function (command, name, pattern,
                                       request_info, request,
                                       timeout, priority,
                                       trans_id, pid) {
    return 'Hello World!';
};

assert(CloudI.API.thread_count() == 1);
var thread = new Task(0);
thread.run();
EOF

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
export NODE=`which node`
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/javascript/"},
  {file_path, "$NODE"},
  {args, "$PWD/hello_world.js"}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/javascript/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex JavaScript examples are listed here.

Perl

A CloudI service written in Perl is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example Perl service can be created by executing the following inside your shell:

cat << EOF > hello_world.pl
use strict;
use warnings;

require CloudI::API;
require CloudI::TerminateException;

sub task
{
    my (\$api) = @_;
    eval
    {
        my \$task_hello_world = sub
        {
            my (\$command, \$name, \$pattern,
                \$request_info, \$request,
                \$timeout, \$priority, \$trans_id, \$pid) = @_;
            return 'Hello World!';
        };
        \$api->subscribe('hello_world/get', \$task_hello_world);
        \$api->poll();
    };
    my \$e = \$@;
    if (\$e)
    {
        if (\$e->isa('CloudI::TerminateException'))
        {
            1;
        }
        else
        {
            print "\$e";
        }
    }
}
{
    CloudI::API->assert(CloudI::API->thread_count() == 1);
    task(CloudI::API->new(0));
}
EOF

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):

export PERL=`which perl`
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/perl/"},
  {file_path, "$PERL"},
  {args, "$PWD/hello_world.pl"},
  {env, [{"PERL5LIB", "/usr/local/lib/cloudi-1.7.1/api/perl"}]}]]
EOF

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/perl/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex Perl examples are listed here.

PHP

A CloudI service written in PHP is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example PHP service can be created by executing the following inside your shell:

cat << EOF > hello_world.php
<?php

require '/usr/local/lib/cloudi-1.7.1/api/php/CloudI.php';

class Task
{
    private \$api;

    public function __construct(\$api)
    {
        \$this->api = \$api;
    }

    public function run()
    {
        try
        {
            \$this->api->subscribe('hello_world/get',
                                   \$this, 'hello_world');
            \$this->api->poll();
        }
        catch (\CloudI\TerminateException \$e)
        {
        }
        catch (Exception \$e)
        {
            error_log("{\$e->getMessage()}\n{\$e}\n");
        }
    }

    public function hello_world(\$command, \$name, \$pattern,
                                \$request_info, \$request,
                                \$timeout, \$priority,
                                \$trans_id, \$pid)
    {
        return 'Hello World!';
    }
}

\$thread_count = \CloudI\API::thread_count();
assert(\$thread_count == 1);
\$main_thread = new Task(new \CloudI\API(0));
\$main_thread->run();

?>
EOF

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
export PHP=`which php`
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/php/"},
  {file_path, "$PHP"},
  {args, "$PWD/hello_world.php"}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/php/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex PHP examples are listed here.

Python

A CloudI service written in Python is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example Python service can be created by executing the following inside your shell:

cat << EOF > hello_world.py
import sys
sys.path.append('/usr/local/lib/cloudi-1.7.1/api/python/')
import traceback
from cloudi import API, terminate_exception

class Task(object):
    def __init__(self):
        self.__api = API(0) # first/only thread == 0

    def run(self):
        try:
            self.__api.subscribe("hello_world/get",
                                 self.__hello_world)
            self.__api.poll()
        except terminate_exception:
            pass
        except:
            traceback.print_exc(file=sys.stderr)

    def __hello_world(self, command, name, pattern,
                      request_info, request,
                      timeout, priority, trans_id, pid):
        return 'Hello World!'

if __name__ == '__main__':
    assert API.thread_count() == 1
    task = Task()
    task.run()
EOF

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
export PYTHON=`which python`
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/python/"},
  {file_path, "$PYTHON"},
  {args, "$PWD/hello_world.py"}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/python/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex Python examples are listed here.

Ruby

A CloudI service written in Ruby is called an "external" service because the service is ran inside an Operating System process (external to the Erlang VM). The example Ruby service can be created by executing the following inside your shell:

cat << EOF > hello_world.rb
\$:.unshift '/usr/local/lib/cloudi-1.7.1/api/ruby'

\$DEBUG = false

require 'cloudi'

if __FILE__ == \$PROGRAM_NAME
    thread_count = CloudI::API.thread_count()
    CloudI::API.assert{thread_count == 1}

    class Task
        def initialize(thread_index)
            @api = CloudI::API.new(thread_index)
        end

        def run
            begin
                @api.subscribe('hello_world/get',
                               method(:hello_world))

                @api.poll
            rescue CloudI::TerminateException
                #
            rescue
                \$stderr.puts \$!.message
                \$stderr.puts \$!.backtrace
            end
        end

        private

        def hello_world(command, name, pattern,
                        request_info, request,
                        timeout, priority, trans_id, pid)
            return 'Hello World!';
        end
    end
    begin
        object = Task.new(0)
        object.run
    rescue
        \$stderr.puts \$!.message
        \$stderr.puts \$!.backtrace
    end
end
EOF

Now it is necessary to create the CloudI service configuration that specifies both the initialization and fault-tolerance constraints the CloudI service should be executed with (with the proplist format to rely on defaults):
```
export RUBY=`which ruby` # must be >= 1.9
export PWD=`pwd`
cat << EOF > hello_world.conf
[[{prefix, "/quickstart/ruby/"},
  {file_path, "$RUBY"},
  {args, "$PWD/hello_world.rb"}]]
EOF
```

To dynamically add the CloudI service configuration that starts the service's execution use:

curl -X POST -d @hello_world.conf \
    http://localhost:6464/cloudi/api/rpc/services_add.erl

The curl requests have been using the cowboy HTTP server that is running within the default CloudI configuration to allow the CloudI Service API to be used over HTTP. The same HTTP server can be used to make a CloudI service request to the hello_world service with:
```
curl http://localhost:6464/quickstart/ruby/hello_world
```
If there was a problem during the service creation there would be an ERROR entry within the /usr/local/var/log/cloudi/cloudi.log file. If an error occurred with a curl command it would be displayed in the shell. The available service configuration parameters are described in the services_add documentation. More complex Ruby examples are listed here.

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