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IDL to avpr/avsc converter; support multiple
throw types
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,173 @@ | ||
| -module(avro_idl). | ||
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| -export([new_context/1, | ||
| str_to_avpr/2, | ||
| protocol_to_avpr/2, | ||
| typedecl_to_avsc/2]). | ||
| -include("idl.hrl"). | ||
|
|
||
| -record(st, {cwd}). | ||
|
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| new_context(Cwd) -> | ||
| #st{cwd = Cwd}. | ||
|
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| str_to_avpr(String, Cwd) -> | ||
| str_to_avpr(String, Cwd, [drop_comments, trim_doc]). | ||
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|
||
| str_to_avpr(String, Cwd, Opts) -> | ||
| {ok, T0, _} = avro_idl_lexer:string(String), | ||
| T = avro_idl_lexer:preprocess(T0, Opts), | ||
| {ok, Tree} = avro_idl_parser:parse(T), | ||
| protocol_to_avpr(Tree, new_context(Cwd)). | ||
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|
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| protocol_to_avpr(#protocol{name = Name, | ||
| meta = Meta, | ||
| definitions = Defs0}, St) -> | ||
| Defs = process_imports(Defs0, St), | ||
| {Types, Messages} = | ||
| lists:partition(fun(#function{}) -> false; | ||
| (_) -> true | ||
| end, Defs), | ||
| Protocol0 = | ||
| #{protocol => Name, | ||
| types => | ||
| lists:map( | ||
| fun(Type) -> | ||
| typedecl_to_avsc(Type, St) | ||
| end, Types), | ||
| messages => | ||
| lists:map( | ||
| fun(Message) -> | ||
| message_to_avsc(Message, St) | ||
| end, Messages) | ||
| }, | ||
| meta(Protocol0, Meta). | ||
|
|
||
| process_imports(Defs, _St) -> | ||
| %% TODO | ||
| lists:filter(fun({import, _, _}) -> false; | ||
| (_) -> true | ||
| end, Defs). | ||
|
|
||
| typedecl_to_avsc(#enum{name = Name, meta = Meta, variants = Vars}, _St) -> | ||
| meta( | ||
| #{type => enum, | ||
| name => Name, | ||
| variants => Vars | ||
| }, | ||
| Meta); | ||
| typedecl_to_avsc(#fixed{name = Name, meta = Meta, size = Size}, _St) -> | ||
| meta( | ||
| #{type => fixed, | ||
| name => Name, | ||
| size => Size}, | ||
| Meta); | ||
| typedecl_to_avsc(#error{name = Name, meta = Meta, fields = Fields}, St) -> | ||
| meta( | ||
| #{type => error, | ||
| name => Name, | ||
| fields => [field_to_avsc(Field, St) || Field <- Fields]}, | ||
| Meta); | ||
| typedecl_to_avsc(#record{name = Name, meta = Meta, fields = Fields}, St) -> | ||
| meta( | ||
| #{type => record, | ||
| name => Name, | ||
| fields => [field_to_avsc(Field, St) || Field <- Fields]}, | ||
| Meta). | ||
|
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||
| field_to_avsc(#field{name = Name, meta = Meta, | ||
| type = Type, default = Default}, St) -> | ||
| meta( | ||
| default( | ||
| #{name => Name, | ||
| type => type_to_avsc(Type, St)}, | ||
| Default), % TODO: maybe validate default matches type | ||
| Meta). | ||
|
|
||
| message_to_avsc(#function{name = Name, meta = Meta, | ||
| arguments = Args, return = Return, | ||
| extra = Extra}, St) -> | ||
| %% TODO: arguments can just reuse `#field{}` | ||
| ArgsSchema = | ||
| [default( | ||
| #{name => ArgName, | ||
| type => type_to_avsc(Type, St)}, | ||
| Default) | ||
| || {arg, ArgName, Type, Default} <- Args], | ||
| Schema0 = | ||
| #{name => Name, | ||
| request => ArgsSchema, | ||
| response => type_to_avsc(Return, St)}, | ||
| Schema1 = case Extra of | ||
| undefined -> Schema0; | ||
| oneway -> | ||
| Schema0#{'one-way' => true}; | ||
| {throws, ThrowsTypes} -> | ||
| %% Throws = [type_to_avsc(TType, St) | ||
| %% || TType <- ThrowsTypes], | ||
| Schema0#{error => ThrowsTypes} | ||
| end, | ||
| meta(Schema1, Meta). | ||
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|
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| type_to_avsc(void, _St) -> | ||
| null; | ||
| type_to_avsc(null, _St) -> | ||
| null; | ||
| type_to_avsc(T, _St) when T == int; | ||
| T == long; | ||
| T == string; | ||
| T == boolean; | ||
| T == float; | ||
| T == double; | ||
| T == bytes -> | ||
| T; | ||
| type_to_avsc({decimal, Precision, Scale}, _St) -> | ||
| #{type => bytes, | ||
| 'logicalType' => "decimal", | ||
| precision => Precision, | ||
| scale => Scale}; | ||
| type_to_avsc(date, _St) -> | ||
| #{type => int, | ||
| 'logicalType' => "date"}; | ||
| type_to_avsc(time_ms, _St) -> | ||
| #{type => int, | ||
| 'logicalType' => "time-millis"}; | ||
| type_to_avsc(timestamp_ms, _St) -> | ||
| #{type => long, | ||
| 'logicalType' => "timestamp-millis"}; | ||
| type_to_avsc({custom, Id}, _St) -> | ||
| Id; | ||
| type_to_avsc({union, Types}, St) -> | ||
| [type_to_avsc(Type, St) || Type <- Types]; | ||
| type_to_avsc({array, Of}, St) -> | ||
| #{type => array, | ||
| items => type_to_avsc(Of, St)}; | ||
| type_to_avsc({map, ValType}, St) -> | ||
| #{type => map, | ||
| values => type_to_avsc(ValType, St)}. | ||
|
|
||
| meta(Schema, Meta) -> | ||
| {Docs, Annotations} = | ||
| lists:partition( | ||
| fun({doc, _}) -> true; | ||
| (#annotation{}) -> false | ||
| end, Meta), | ||
| Schema1 = case Docs of | ||
| [] -> Schema; | ||
| _ -> | ||
| DocStrings = [S || {doc, S} <- Docs], | ||
| Schema#{"doc" => lists:flatten(lists:join( | ||
| "\n", DocStrings))} | ||
| end, | ||
| lists:foldl( | ||
| fun(#annotation{name = Name, value = Value}, Schema2) -> | ||
| maps:is_key(Name, Schema2) andalso | ||
| error({duplicate_annotation, Name, Value, Schema2}), | ||
| Schema2#{Name => Value} | ||
| end, Schema1, Annotations). | ||
|
|
||
| default(Obj, undefined) -> | ||
| Obj; | ||
| default(Obj, Default) -> | ||
| Obj#{default => Default}. |
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