An Implementation of 'Interactive Brokers' API.

rib

An R implementation of Interactive Brokers API

Originally inspired by IBrokers, rib is a native R client that implements Interactive Brokers API to communicate with TWS or IBGateway.

It aims to be feature complete, however it does not support legacy versions. Currently, only API versions v176+ are supported.

The package design mirrors the official C++/Java IB API, which is based on an asynchronous communication model over TCP.

Installation

To install from CRAN:

install.packages("rib")

To install the latest snapshot from GitHub, assuming devtools or at least remotes is already installed:

remotes::install_github("lbilli/rib")

Usage

The user interacts mainly with two classes, implemented as R6 objects:

• IBClient: responsible to establish a connection and send requests to the server
• IBWrap: base class holding the callbacks that are invoked when responses are processed. User customizations are derived from this class.

Other data structures, such as Contract and Order, are implemented as R lists, or nested lists, and mirror the respective classes in the official IB API.

A complete minimal working example is shown. For this code to work, an instance of IB TWS or IBGateway needs to be running on the local machine and listening on port 4002. Note:demo or paper account recommended!! :smirk:

library(rib)

# Define a customized callbacks wrapper
IBWrapCustom <- R6::R6Class("IBWrapCustom",
  class=      FALSE,
  cloneable=  FALSE,
  lock_class= TRUE,

  inherit= IBWrap,

  public= list(
    # Customized methods go here
    error=            function(id, errorCode, errorString, advancedOrderRejectJson)
                        cat("Error:", id, errorCode, errorString, advancedOrderRejectJson, "\n"),

    nextValidId=      function(orderId)
                        cat("Next OrderId:", orderId, "\n"),

    managedAccounts=  function(accountsList)
                        cat("Managed Accounts:", accountsList, "\n")

    # more method overrides can go here...
  )
)

# Instantiate wrapper and client
wrap <- IBWrapCustom$new()
ic   <- IBClient$new()

# Connect to the server with clientId = 1
ic$connect(port=4002, clientId=1)

# Check connection messages (optional)
ic$checkMsg(wrap)

# Define contract
contract <- IBContract(symbol="GOOG", secType="STK", exchange="SMART", currency="USD")

# Define order
order <- IBOrder(action="BUY", totalQuantity=10, orderType="LMT", lmtPrice=100)

orderId <- 1    # Should match whatever is returned by the server

# Send order
ic$placeOrder(orderId, contract, order)

# Check inbound messages
ic$checkMsg(wrap)

# Disconnect
ic$disconnect()

As R is single threaded, in general it is the user's responsibility to code some kind of event loop to periodically process incoming messages: i.e. there is no background Reader monitoring the connection and processing the server responses.

Two possible approaches, with or without a loop, are described:

Straight Request-Response pattern. No loop.

This is the simplest case. It's not suitable for data subscriptions or whenever a stream of messages is expected. It follows the pattern:

• connect
• send requests
• process responses
• disconnect

library(rib)

# Instantiate wrapper, client and connect
wrap <- IBWrapSimple$new()
ic   <- IBClient$new()
ic$connect(port=4002, clientId=1)

# Send requests, e.g.:
contract <- IBContract(symbol="GOOG", secType="STK", exchange="SMART", currency="USD")
ic$reqContractDetails(11, contract)

# more requests can go here...

# Parse responses
# Might need to be called several times to exhaust all messages
ic$checkMsg(wrap)

# Find results in
wrap$context

# Disconnect
ic$disconnect()

Request-Response loop

A more realistic application requires a loop around the previous example:

• connect
• repeat
  • send requests
  • process responses
  • if done exit
• disconnect

library(rib)

# Instantiate wrapper, client and connect
wrap <- IBWrapSimple$new()
ic   <- IBClient$new()
ic$connect(port=4002, clientId=1)

# Main loop
repeat {

  # Application logic goes here
  # e.g.: send request
  ic$reqContractDetails(...)

  # Wait and process responses
  ic$checkMsg(wrap)

  if(done)
    break

  # Might be convenient to have a little wait here
  Sys.sleep(1)
}

# Disconnect
ic$disconnect()

Implementation Details

IBClient

This implements the IB EClient class functionality. Among its methods:

• new(): create a new instance.
• connect(host, port, clientId, connectOptions): establish a connection.
• disconnect(): terminate the connection.
• checkMsg(wrap, timeout): wait for responses and dispatch callbacks defined in wrap, which must be an instance of a class derived from IBWrap. If no response is available, it blocks up to timeout seconds. If wrap is missing, messages are taken off the wire and discarded. Return the number of responses processed. Needs to be called regularly!
• methods that send requests to the server. Refer to the official IB EClient class documentation for further details and method signatures.

IBWrap

Like the official IB EWrapper class, this holds the callbacks that are dispatched when responses are processed. IBWrap itself contains only stubs. Users need to derive from it and override the desired methods. The code above provides a template of the procedure.

For a more extensive example refer to the definition of IBWrapSimple, mainly provided for illustrative purposes, which simply prints out the content of the responses or store it within IBWrapSimple$context for later inspection.

For more details about callback definitions and signatures, refer to the official IB EWrapper class documentation.

Notes

Callbacks are generally invoked with arguments and types matching the signatures as described in the official documentation. However, there are few exceptions:

• tickPrice() has an extra size argument, which is meaningful only when TickType ∈ {BID, ASK, LAST}. In these cases, the official IB API fires an extra tickSize() event instead.
• historicalData() is invoked only once per request, presenting all the historical data as a single data.frame, whereas the official IB API invokes it row-by-row.
• scannerData() is also invoked once per request and its arguments are in fact vectors rather than single values.

These modifications make it possible to establish the rule: one callback per server response.

Consequently, historicalDataEnd() and scannerDataEnd() are redundant and are not used in this package.

data.frame are passed to several other callbacks, such as: softDollarTiers(), familyCodes(), mktDepthExchanges(), smartComponents(), newsProviders(), histogramData(), marketRule() and the historicalTicks*() family.

Missing Values

Occasionally, for numerical types, there is the need to represent the lack of a value.

IB API does not have a uniform solution across the board, but rather it adopts a variety of sentinel values. They can be either the plain 0 or the largest representable value of a given type such as 2147483647 and 9223372036854775807 for 32- and 64-bit integers respectively or 1.7976931348623157E308 for 64-bit floating point.

This package makes an effort to use R built-in NA in all circumstances.

Data Structures

Other classes that mainly hold data are also replicated. They are implemented as R lists, possibly nested, with names, types and default values matching the IB API counterparts: e.g.Contract, Order, ComboLeg, ExecutionFilter, ScannerSubscription and Condition.

To use them, simply make a copy and override their elements:

contract          <- Contract
contract$conId    <- 12345
contract$currency <- "USD"

In the case of Contract and Order, helper functions are also provided to simplify the assignment to a subset of the fields:

contract <- IBContract(symbol="GOOG", secType="STK", exchange="SMART", currency="USD")

# Equivalent to
contract <- Contract
contract$symbol   <- "GOOG"
contract$secType  <- "STK"
contract$exchange <- "SMART"
contract$currency <- "USD"

and

order <- IBOrder(action="BUY", totalQuantity=100, orderType="LMT", lmtPrice=110)

# Equivalent to
order <- Order
order$action        <- "BUY"
order$totalQuantity <- 100
order$orderType     <- "LMT"
order$lmtPrice      <- 110

To instantiate a Condition, invoke fCondition(type) and fill in the appropriate fields:

condition <- fCondition("Price")
condition$conId    <- 265598L
condition$exchange <- "SMART"
condition$is_more  <- TRUE
condition$value    <- 200

TagValueList are implemented as R named character vectors. Wherever a TagValueList is needed, something like this can be used:

tagvaluelist <- c(tag1="value1", tag2="value2")
# or, in case of an empty list:
emptylist <- character()