vrpc

Documentation

Overview

Command vrpc sends and receives Vanadium remote procedure calls. It is used as a generic client to interact with any Vanadium server.

Usage:

vrpc [flags] <command>

The vrpc commands are:

signature   Describe the interfaces of a Vanadium server
call        Call a method of a Vanadium server
identify    Reveal blessings presented by a Vanadium server
help        Display help for commands or topics

The vrpc flags are:

-s=false
  if true, perform a shallow resolve

The global flags are:

-v23.namespace.root=[/(dev.v.io:r:vprod:service:mounttabled)@ns.dev.v.io:8101]
  local namespace root; can be repeated to provided multiple roots

-alsologtostderr=true
  log to standard error as well as files
-log_backtrace_at=:0
  when logging hits line file:N, emit a stack trace
-log_dir=
  if non-empty, write log files to this directory
-logtostderr=false
  log to standard error instead of files
-max_stack_buf_size=4292608
  max size in bytes of the buffer to use for logging stack traces
-metadata=<just specify -metadata to activate>
  Displays metadata for the program and exits.
-stderrthreshold=2
  logs at or above this threshold go to stderr
-time=false
  Dump timing information to stderr before exiting the program.
-v=0
  log level for V logs
-v23.credentials=
  directory to use for storing security credentials
-v23.i18n-catalogue=
  18n catalogue files to load, comma separated
-v23.proxy=
  object name of proxy service to use to export services across network
  boundaries
-v23.tcp.address=
  address to listen on
-v23.tcp.protocol=wsh
  protocol to listen with
-v23.vtrace.cache-size=1024
  The number of vtrace traces to store in memory.
-v23.vtrace.collect-regexp=
  Spans and annotations that match this regular expression will trigger trace
  collection.
-v23.vtrace.dump-on-shutdown=true
  If true, dump all stored traces on runtime shutdown.
-v23.vtrace.sample-rate=0
  Rate (from 0.0 to 1.0) to sample vtrace traces.
-v23.vtrace.v=0
  The verbosity level of the log messages to be captured in traces
-vmodule=
  comma-separated list of globpattern=N settings for filename-filtered logging
  (without the .go suffix).  E.g. foo/bar/baz.go is matched by patterns baz or
  *az or b* but not by bar/baz or baz.go or az or b.*
-vpath=
  comma-separated list of regexppattern=N settings for file pathname-filtered
  logging (without the .go suffix).  E.g. foo/bar/baz.go is matched by patterns
  foo/bar/baz or fo.*az or oo/ba or b.z but not by foo/bar/baz.go or fo*az

Vrpc signature - Describe the interfaces of a Vanadium server

Signature connects to the Vanadium server identified by <server>.

If no [method] is provided, returns all interfaces implemented by the server.

If a [method] is provided, returns the signature of just that method.

Usage:

vrpc signature [flags] <server> [method]

<server> identifies a Vanadium server. It can either be the object address of the server, or an object name that will be resolved to an end-point.

[method] is the optional server method name.

The vrpc signature flags are:

-insecure=false
  If true, skip server authentication. This means that the client will reveal
  its blessings to servers that it may not recognize.
-show-reserved=false
  if true, also show the signatures of reserved methods

-s=false
  if true, perform a shallow resolve

Vrpc call - Call a method of a Vanadium server

Call connects to the Vanadium server identified by <server> and calls the <method> with the given positional [args...], returning results on stdout.

TODO(toddw): stdin is read for streaming arguments sent to the server. An EOF on stdin (e.g. via ^D) causes the send stream to be closed.

Regardless of whether the call is streaming, the main goroutine blocks for streaming and positional results received from the server.

All input arguments (both positional and streaming) are specified as VDL expressions, with commas separating multiple expressions. Positional arguments may also be specified as separate command-line arguments. Streaming arguments may also be specified as separate newline-terminated expressions.

The method signature is always retrieved from the server as a first step. This makes it easier to input complex typed arguments, since the top-level type for each argument is implicit and doesn't need to be specified.

Usage:

vrpc call [flags] <server> <method> [args...]

<server> identifies a Vanadium server. It can either be the object address of the server, or an object name that will be resolved to an end-point.

<method> is the server method to call.

[args...] are the positional input arguments, specified as VDL expressions.

The vrpc call flags are:

-s=false
  if true, perform a shallow resolve

Vrpc identify - Reveal blessings presented by a Vanadium server

Identify connects to the Vanadium server identified by <server> and dumps out the blessings presented by that server (and the subset of those that are considered valid by the principal running this tool) to standard output.

Usage:

vrpc identify [flags] <server>

<server> identifies a Vanadium server. It can either be the object address of the server, or an object name that will be resolved to an end-point.

The vrpc identify flags are:

-insecure=false
  If true, skip server authentication. This means that the client will reveal
  its blessings to servers that it may not recognize.

-s=false
  if true, perform a shallow resolve

Vrpc help - Display help for commands or topics

Help with no args displays the usage of the parent command.

Help with args displays the usage of the specified sub-command or help topic.

"help ..." recursively displays help for all commands and topics.

Usage:

vrpc help [flags] [command/topic ...]

[command/topic ...] optionally identifies a specific sub-command or help topic.

The vrpc help flags are:

-style=compact
  The formatting style for help output:
     compact   - Good for compact cmdline output.
     full      - Good for cmdline output, shows all global flags.
     godoc     - Good for godoc processing.
     shortonly - Only output short description.
  Override the default by setting the CMDLINE_STYLE environment variable.
-width=<terminal width>
  Format output to this target width in runes, or unlimited if width < 0.
  Defaults to the terminal width if available.  Override the default by setting
  the CMDLINE_WIDTH environment variable.