opensips-mi-client

OpenSIPS 3.0 Management Interface Client

Introduction

This is a client library that wraps all OpenSIPS 3.0 MI Functions in a comprehensive and easy-to-use way. It is not intended to verify or handle the functionality of OpenSIPS modules. At this moment opensips-mi-client only supports http transport.

Installation

npm install opensips-mi-client

Configuration

This library supports the following environment variables:

OS_MI_COMM_TYPE=http
OS_MI_FIFO_FILE=/tmp/opensips_fifo
OS_MI_FIFO_REPLY_DIR=/tmp
OS_MI_URL=http://127.0.0.1:8888/mi

It also uses dotenv node module, so you can create a .env file at the root of the project to set the variables. These variables can be easily retrieved by importing config object from the library as follows:

import { config } from 'opensips-mi-client';
console.log(config);

The config object has the properties communication_type, fifo_file, fifo_reply_dir and url, with the corresponding values read from the .env file.

{  communication_type: 'http',
   fifo_file: '/tmp/opensips_fifo',
   fifo_reply_dir: '/tmp',
   url: 'http://127.0.0.1:8888/mi',
   jsonrpcVersion: '2.0' }

Usage

TypeScript

Client class is the default export of the library, so you can import it as follows:

import Client from 'opensips-mi-client';

Now you are able to connect to the OpenSIPS instance defined in .env and get its version with just a few lines of code:

import Client from 'opensips-mi-client';

const showVersion = async () => {
    const client = new Client();
    const version = await client.version();
    console.log(version);
};

showVersion();

{ Server: 'OpenSIPS (3.1.0-dev (x86_64/linux))' }

Client class constructor supports passing the parameters needed to connect to OpenSIPS, so instead of using environment variables you can create a client as follows:

import Client from 'opensips-mi-client';
const client = new Client({ url: 'http://10.10.10.10:8000/mi' });

Note: at this moment opensips-mi-client only supports http transport.

Javascript

Use the library in Javascript as follows:

const Client = require('opensips-mi-client').default;

const showVersion = async () => {
    const client = new Client();
    const version = await client.version();
    console.log(version);
};

showVersion();

{ Server: 'OpenSIPS (3.1.0-dev (x86_64/linux))' }

Promises

Most of the methods exposed by the classes of this library are asynchronous, so they return promises. You should use await/async syntax as shown in the examples above to handle those promises, or then() catch() methods if you prefer.

Function Parameters

All parameters required by OpenSIPS MI functions are passed to each method defined in this library using only one parameter called params. For each method, params type has been defined according to the specifications of the respective MI function.

Intellisense

In order to get the must from this library, it is recommended to use an IDE that can read JsDoc descriptions. Every single method includes its explanation and the description of its parameters in JsDoc format, based on the OpenSIPS documentation. Parameter types have been excluded from JsDoc because they are enforced by TypeScript.

Name Conventions

The OpenSIPS Management Interface, and must of its code, uses snake_case naming convention. This library has been developed using camelCase and PascalCase naming following the ESLint Code Conventions. In order to do that, names of MI functions have been converted to camelCase, but the names of its parameters have not been changed. For example:

const dialog_id = 'Y2IwYjQ2YmE2ZDg5MWVkNDNkZGIwZjAzNGM1ZDY';
await client.dialog.endDlg({ dialog_id });

Here MI function name dlg_end_dlg was converted to endDlg (camelCase), but the parameter keeps the same name dialog_id. This is because OpenSIPS MI needs to receive the parameters with these specific names. This library does not parse the parameters in any way, it only defines their types and passes them to OpenSIPS MI. If you see a parameter name in all caps, it is because that is the name OpenSIPS MI expects, like DID in this example:

const dlg_val_name = 'var_name';
const dlg_val_value = 'var_value';
const DID = ['DID1'];
const response = await client.dialog.pushVar({ dlg_val_name, dlg_val_value, DID });

OpenSIPS modules are defined as classes in opensips-mi-client and their names where converted to PascalCase. As noticed in the above examples, MI functions prefixes dlg_ were removed from the method names for clarity and simplicity.

Modules

This library defines one class for each OpenSIPS module, and the Client class exposes all possible modules as properties. If the OpenSIPS instance we are connected to does not support the MI functions of one module (maybe because it is not loaded), and we try to execute any of its methods, an error like the following will be trigger:

'dlg_end_dlg' command is not available in this OpenSIPS instance.

Note: the names of the properties (modules) in Client class use camelCase naming convention.

Statistics

The Client class exposes all core MI functions, including listStatistics and getStatistics methods. These methods work in the way documented in OpenSIPS: listStatistics returns a list of all available statistics in the instance, and getStatistics returns their realtime values. getStatistics allows to filter statistics using a group or an specific name. This library also exposes a getStatistics method in every module that has statistics. This method can be used to obtain the realtime values of the statistics of the module from where it is called. For example:

const response = await client.dialog.getStatistics();
console.log(response);

will print

{
    active_dialogs: 0,
    early_dialogs: 0,
    processed_dialogs: 0,
    expired_dialogs: 0,
    failed_dialogs: 0,
    create_sent: 0,
    update_sent: 0,
    delete_sent: 0,
    create_recv: 0,
    update_recv: 0,
    delete_recv: 0,
}

To facilitate getting statistics by name, all possible statistics of a module are exposed in an enum of the class called Stats. For example, in order to get only the value of the update_recv statistic, call the getStatistics method of client.dialog using the corresponding enum member.

const response = await client.dialog.getStatistics(Dialog.Stats.UpdateRecv);
console.log(response);

it will print

{ update_recv: 0 }

All Stats enums include an All member that can be used to obtain the values of all the statistics. You will get the same result if you call getStatistics method without any parameter. It is not mandatory to call getStatistics using the enum, you can get stats values by name using strings:

const response = await client.dialog.getStatistics('update_recv');
console.log(response);

Note: Stats enum can only be used in TypeScript. For Javascript you should get stats values by their names.

This library defines as types the names of all the statistics of every module to enforce the use of valid names in TypeScript. So, if you try to pass an invalid statistic name, TypeScript will trigger a compilation error.

There are some statistics in TM and SL modules with names that cannot be used to define enums (2xx_transactions, 1xx_replies, etc.). The letter C (code) was added in front of these names in order to define the corresponding members in Stats enums as follows:

Tm.Stats.C2xxTransactions
Tm.Stats.C3xxTransactions
Tm.Stats.C4xxTransactions
Tm.Stats.C5xxTransactions
Tm.Stats.C6xxTransactions

Sl.Stats.C1xxReplies
Sl.Stats.C2xxReplies
Sl.Stats.C3xxReplies
Sl.Stats.C4xxReplies
Sl.Stats.C5xxReplies
Sl.Stats.C6xxReplies

Note that the statistics are returned without the group name. This functionality is implemented in opensips-mi-client by default to make easier to manipulate the statistics values. If you want to get the original names returned by OpenSIPS, you can pass the keepGroupName option to getStatistics as follows:

const options = { keepGroupName: true };
const response = await client.dialog.getStatistics(Dialog.Stats.All, options);
console.log(response);

and get

{   'dialog:active_dialogs': 0,
    'dialog:early_dialogs': 0,
    'dialog:processed_dialogs': 0,
    'dialog:expired_dialogs': 0,
    'dialog:failed_dialogs': 0,
    'dialog:create_sent': 0,
    'dialog:update_sent': 0,
    'dialog:delete_sent': 0,
    'dialog:create_recv': 0,
    'dialog:update_recv': 0,
    'dialog:delete_recv': 0 }

Statistics of Call Center Module

The Call Center module has three types of statistics: global, per-flow and per-agent. Global statistics follow the same schema used by other modules where each realtime value has a fixed name. However, per-flow and per-agent statistics use parametrized names that include the flow ID or the agent ID. For example, get_statistics call_center:ccf_incalls-sales returns the number of received calls of the flow with ID sales, and get_statistics call_center:cca_att-agentX returns the average talk time of the agent with ID agentX.

The CallCenter class of opensips-mi-client has the getStatistics method that can be used to retrieve realtime values of the global statistics. The Stats enum of this class only includes the global statistics names. To get per-flow of per-agent statistics values you have to use the getFlowStatistic and getAgentStatistic methods, respectively. These methods need an additional parameter: the flow ID or the agent ID. Following the examples mentioned above, if we want to get the received calls of sales flow, we should call getFlowStatistic in this way:

const incalls = await client.callCenter.getFlowStatistic(CallCenter.FlowStats.Incalls, 'sales');

The CallCenter class has a FlowStats enum that lists the per-flow statistics. It also includes an AgentStats enum with the collection of per-agent statistics. The average talk time of agentX could be retrieved as follows:

const att = await client.callCenter.getAgentStatistic(CallCenter.AgentStats.Att, 'agentX');

You can pass the name of the per-flow or per-agent statistic you want as a string, just take into account that statistic names do not include the hyphen before the ID. The equivalent of the examples above would be:

const incalls = await client.callCenter.getFlowStatistic('ccf_incalls', 'sales');
const att = await client.callCenter.getAgentStatistic('cca_att', 'agentX');

The keepGroupName option could be passed to getFlowStatistic or getAgentStatistic in order to get the original names returned by OpenSIPS, as in getStatistics.