package wcs-lib

SDK and command line interface for Watson Conversation Service

wcs-ocaml is a source development kit in OCaml and command line interface for Watson Conversation Service (WCS). It allows to program chat bots in OCaml.

• wcs-lib provides a framework to write WCS programs, called workspaces.

• wcs-api offers an OCaml binding to the service API and a generic client application.

• wcs is a command line tool that interact with the service.

Building

Prerequistes

To build from source, you will need:

• OCaml 4.04 or later (http://ocaml.org/) along with the following libraries:

  • ocamlfind, a library manager (http://projects.camlcity.org/projects/findlib.html)

  • jbuilder, a build system (https://github.com/janestreet/jbuilder)

  • atdgen, a json parser generator (https://github.com/mjambon/atdgen)

  • cohttp, HTTPS client (https://github.com/mirage/ocaml-cohttp)

An easy way to get set up on most platforms is to use the OCaml package manager (https://opam.ocaml.org). Once opam is installed, you can just add the corresponding libraries:

opam install ocamlfind jbuilder atdgen
opam install lwt ssl tls cohttp

Compiling

To compile, do:

make

Watson Conversation Service command line interface

The compilation produces a command line interface for Watson Conversation Service in:

./_build/install/default/bin/wcs

The command line interface support the following commands:

• list - List the workspaces associated with a Conversation service instance.

• create - Create workspaces on the Conversation service instance.

• delete - Delete workspaces from the Conversation service instance.

• get - Get information about workspaces, optionally including all workspace contents.

• update - Update an existing workspace with new or modified data.

• try - Generic bot running in the terminal.

All commands require to get the Watson Conversation Service credentials. They should be stored in a JSON file with the following structure (getting credentials):

{
  "url": "https://gateway.watsonplatform.net/conversation/api",
  "password": "PASSWORD",
  "username": "USERNAME"
}

The path to this JSON file can be provided either with the option -wcs-cred or through the environment variable WCS_CRED.

The list command

List the workspaces associated with a Conversation service instance.

Usage:
  wcs list [options]
Options:
  -page_limit n       The number of records to return in each page of results.
  -include_count b    Whether to include information about the number of records returned.
  -sort attr          The attribute by which returned results will be sorted. To reverse the sort order, prefix the value with a minus sign (-). Supported values are name, modified, and workspace_id.
  -cursor token       A token identifying the last value from the previous page of results.
  -short              Display ony workspace ids and names.
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

The command ls is a synonym for the command list -short.

The create command

Create workspaces on the Conversation service instance.

Usage:
  wcs create [options] [workspace.json ...]
Options:
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

The delete command

Delete workspaces from the Conversation service instance.

Usage:
  wcs delete [options] [workspace_id ...]
Options:
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

The command rm is a synonym for the command delete.

The get command

Get information about workspaces, optionally including all workspace contents.

Usage:
  wcs get [options] [workspace_id ...]
Options:
  -export             To include all element content in the returned data.
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

The update command

Update an existing workspace with new or modified data.

Usage:
  wcs update [options] workspace.json workspace_id
Options:
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

The logs command

List the events from the log of a workspace.

Usage:
  wcs logs [options] [workspace_id ...]
Options:
  -filter s           A cacheable parameter that limits the results to those matching the specified filter.
  -page_limit n       The number of records to return in each page of results.
  -sort attr          The attribute by which returned results will be sorted. To reverse the sort order, prefix the value with a minus sign (-). The only supported value is request_timestamp.
  -cursor token       A token identifying the last value from the previous page of results.
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

The try command

Generic bot running in the terminal.

Usage:
  wcs try [options] workspace_id
Options:
  -context ctx.json   The initial context.
  -text txt           The initial user input.
  -node node_id       The node where to start the conversation.
  -wcs-cred cred.json The file containing the Watson Conversation Service credentials.
  -version            Print the Watson Conversation API version number used.
  -no-error-recovery  Do not try to recover in case of error.
  -debug              Print debug messages.
  -help               Display this list of options

Watson Conversation Service OCaml API

The interface to use Watson Conversation Service is defined in the module Wcs (https://github.ibm.com/Conversational/wcs-ocaml/blob/master/src/wcs.mli).