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## This Source Code Form is subject to the terms of the Mozilla Public
## License, v. 2.0. If a copy of the MPL was not distributed with this
## file, You can obtain one at https://mozilla.org/MPL/2.0/.
##
## Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
# Basic JSON formatter. Supports 1-level of
# collection using start/finish_collection.
# Primary purpose is to translate stream from CTL,
# so there is no need for multiple collection levels
defmodule RabbitMQ.CLI.Formatters.JsonStream do
@moduledoc """
Formats a potentially infinite stream of maps, proplists, keyword lists,
and other things that are essentially a map.
The output exclude JSON array boundaries. The output can be fed
to `jq' for pretty printing, filtering and querying.
"""
@behaviour RabbitMQ.CLI.FormatterBehaviour
alias RabbitMQ.CLI.Formatters.FormatterHelpers
alias RabbitMQ.CLI.Core.Platform
def format_output("", _opts) do
# the empty string can be emitted along with a finishing marker that ends the stream
# (e.g. with commands that have a duration argument)
# we just emit the empty string as the last value for the stream in this case
""
end
def format_output(output, _opts) do
{:ok, json} = JSON.encode(keys_to_atoms(output))
json
end
def format_stream(stream, options) do
elements =
Stream.flat_map(
stream,
fn
[first | _] = element ->
case FormatterHelpers.proplist?(first) or is_map(first) do
true -> element
false -> [element]
end
other ->
[other]
end
)
|> Stream.scan(
:empty,
FormatterHelpers.without_errors_2(fn element, _previous ->
format_element(element, options)
end)
)
elements
end
def keys_to_atoms(enum) do
Enum.map(enum,
fn({k, v}) when is_binary(k) or is_list(k) ->
{String.to_atom(k), v}
(other) -> other
end)
end
def format_element(val, options) do
format_output(val, options) <> Platform.line_separator()
end
def machine_readable?, do: true
end
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