189 lines
6.2 KiB
Plaintext
189 lines
6.2 KiB
Plaintext
json-rpc-shell(1)
|
|
=================
|
|
:doctype: manpage
|
|
:manmanual: json-rpc-shell Manual
|
|
:mansource: json-rpc-shell {release-version}
|
|
|
|
Name
|
|
----
|
|
json-rpc-shell - a shell for JSON-RPC 2.0
|
|
|
|
Synopsis
|
|
--------
|
|
*json-rpc-shell* [_OPTION_]... { _ENDPOINT_ | _COMMAND_ [_ARG_]... }
|
|
|
|
Description
|
|
-----------
|
|
The _ENDPOINT_ must be either an HTTP or a WebSocket URL, with or without TLS
|
|
(i.e. one of the _+++http+++://_, _+++https+++://_, _ws://_, _wss://_ schemas).
|
|
|
|
*json-rpc-shell* will use it to send any JSON-RPC 2.0 requests you enter on its
|
|
command line. The server's response will be parsed and validated, stripping it
|
|
of the protocol's noisy envelope. At your option, it can then also be
|
|
pretty-printed, rendered with adjustable syntax highlighting, or even piped
|
|
through another program such as the *less*(1) pager or the *jq*(1) JSON
|
|
processor.
|
|
|
|
Usage
|
|
~~~~~
|
|
Three things may appear on the internal command line, in a sequence. The first
|
|
one is always the name of the JSON-RPC method to call, as a bare word, separated
|
|
from the rest by white space. Following that, you may enter three kinds of JSON
|
|
values. If it is an object or an array, it constitutes the method parameters.
|
|
If it is a string or a number, it is taken as the "id" to use for the request,
|
|
which would be chosen for you automatically if left unspecified. Finally,
|
|
a null value indicates that the request should be sent as a notification,
|
|
lacking the ID completely. Booleans cannot be used for anything.
|
|
|
|
The response to the method call may be piped through external commands, the same
|
|
way you would do it in a Unix shell.
|
|
|
|
Exit the program by pressing C-c or C-d. No special keywords are reserved for
|
|
this action as they might conflict with method names.
|
|
|
|
Options
|
|
-------
|
|
Controlling output
|
|
~~~~~~~~~~~~~~~~~~
|
|
*-c*, *--compact-output*::
|
|
Do not pretty-print responses. Normally, spaces and newlines are added
|
|
where appropriate to improve readability.
|
|
|
|
*--color*=_WHEN_::
|
|
By default, when the output of the program is a terminal, JSON responses
|
|
are syntax-highlighted. This corresponds to the _auto_ setting. You may
|
|
also set this to _always_ or _never_. In either case, color is never
|
|
applied when piping to another program.
|
|
|
|
*-v*, *--verbose*::
|
|
Print raw requests and responses, including the JSON-RPC 2.0 envelope.
|
|
|
|
*-d*, *--debug*::
|
|
Print even more information to help debug various issues.
|
|
|
|
Protocol
|
|
~~~~~~~~
|
|
*-n*, *--null-as-id*::
|
|
Normally, entering a null JSON value on the command line causes
|
|
a notification to be sent. With this option, it is sent as the "id"
|
|
field of a normal request, which is discouraged by the specification.
|
|
|
|
*-t*, *--trust-all*::
|
|
Trust all SSL/TLS certificates. Useful in case that the certificate is
|
|
self-signed, or when the CA isn't in your CA store. Beware that this option
|
|
is about as good as using plain unencrypted HTTP.
|
|
|
|
*-o* _ORIGIN_, *--origin*=_ORIGIN_::
|
|
Set the HTTP Origin header to _ORIGIN_. Some servers may need this.
|
|
|
|
*-O*[__PATH__], *--openrpc*[**=**__PATH__]::
|
|
Call "rpc.discover" upon start-up in order to pull in OpenRPC data for
|
|
tab completion of method names. If a path is given, it is read from a file.
|
|
|
|
*-e*, *--execute*::
|
|
Rather than an _ENDPOINT_, accept a command line to execute and communicate
|
|
with using the JSON-RPC 2.0 protocol variation used in the Language Server
|
|
Protocol.
|
|
|
|
Program information
|
|
~~~~~~~~~~~~~~~~~~~
|
|
*-h*, *--help*::
|
|
Display a help message and exit.
|
|
|
|
*-V*, *--version*::
|
|
Output version information and exit.
|
|
|
|
*--write-default-cfg*[**=**__PATH__]::
|
|
Write a default configuration file, show its path and exit.
|
|
|
|
Files
|
|
-----
|
|
_~/.config/json-rpc-shell/json-rpc-shell.conf_::
|
|
The configuration file, in which you can configure color output and
|
|
CA certificate paths. Use the *--write-default-cfg* option to create
|
|
a new one for editing.
|
|
|
|
_~/.local/share/json-rpc-shell/history_::
|
|
All your past method invocations are stored here upon exit and loaded back
|
|
on start-up.
|
|
|
|
Notes
|
|
-----
|
|
Editing
|
|
~~~~~~~
|
|
While single-line editing on the command line may be satisfactory for simple
|
|
requests, it is often convenient or even necessary to run a full text editor
|
|
in order to construct complex objects or arrays, and may even be used to import
|
|
data from elsewhere. You can launch an editor for the current request using
|
|
the M-e key combination. Both *readline*(3) and *editline*(7) also support
|
|
multiline editing natively, press either M-Enter or C-v C-j in order to insert
|
|
newlines.
|
|
|
|
WebSocket
|
|
~~~~~~~~~
|
|
The JSON-RPC 2.0 specification doesn't say almost anything about underlying
|
|
transports. The way it's implemented here is that every request is sent as
|
|
a single text message. If it has an "id" field, i.e., it's not just
|
|
a notification, the client waits for a message from the server in response.
|
|
Should any message arrive unexpectedly, you will receive a warning.
|
|
|
|
There is no support so far for any protocol extensions, nor for specifying
|
|
the higher-level protocol (the "Sec-Ws-Protocol" HTTP field).
|
|
|
|
Bugs
|
|
----
|
|
The editline (libedit) frontend is more of a proof of concept that mostly seems
|
|
to work but exhibits bugs that are not our fault.
|
|
|
|
Examples
|
|
--------
|
|
Running some queries against json-rpc-test-server, included in the source
|
|
distribution of this program (public services are hard to find):
|
|
|
|
Methods without parameters
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
$ json-rpc-shell ws://localhost:1234
|
|
json-rpc> ping
|
|
"pong"
|
|
json-rpc> date
|
|
{
|
|
"year": 2020,
|
|
"month": 9,
|
|
"day": 5,
|
|
"hours": 2,
|
|
"minutes": 23,
|
|
"seconds": 51
|
|
}
|
|
|
|
Notification with a parameter
|
|
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
Notifications never produce a response, not even when the method is not known
|
|
to the server:
|
|
|
|
$ json-rpc-shell ws://localhost:1234
|
|
json-rpc> notify {"events": ["conquest", "war", "famine", "death"]} null
|
|
[Notification]
|
|
|
|
Piping in and out
|
|
~~~~~~~~~~~~~~~~~
|
|
GNU Readline always repeats the prompt, which makes this a bit less useful
|
|
for invoking from other programs:
|
|
|
|
$ echo 'ping | jq ascii_upcase' | json-rpc-shell ws://localhost:1234
|
|
json-rpc> ping | jq ascii_upcase
|
|
"PONG"
|
|
|
|
Reporting bugs
|
|
--------------
|
|
Use https://git.janouch.name/p/json-rpc-shell to report bugs, request features,
|
|
or submit pull requests.
|
|
|
|
See also
|
|
--------
|
|
*jq*(1), *readline*(3) or *editline*(7)
|
|
|
|
Specifications
|
|
~~~~~~~~~~~~~~
|
|
https://www.jsonrpc.org/specification +
|
|
https://www.json.org
|