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exprotobuf provides native encoding/decoding of protobuf messages via generated modules/structs.
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lib/exprotobuf/utils.ex
defmodule Protobuf.Utils do
@moduledoc false
def convert_to_record(map, module) do
# Convert module name if necessary
record_name = case module do
Protobuf.Field -> :field
_ -> module
end
# Convert the map to it's record representation by
# using the record schema originally extracted and
# defined in the module provided. For each field
# defined in the schema, get that field from the map,
# then add it to a list of values matching the record's
# original order. Convert that list to a tuple when done.
module.record
|> Enum.reduce([record_name], fn {key, default}, acc ->
value = Map.get(map, key, default)
[value|acc]
end)
|> Enum.reverse
|> List.to_tuple
end
def convert_from_record(rec, module) do
map = struct(module)
module.record
|> Enum.with_index
|> Enum.reduce(map, fn {{key, _default}, idx}, acc ->
# rec has the extra element when defines the record type
value = elem(rec, idx + 1)
Map.put(acc, key, value)
end)
end
end