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%% Copyright (c) 2022 Peter Morgan <peter.james.morgan@gmail.com> |
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%% |
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%% Licensed under the Apache License, Version 2.0 (the "License"); |
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%% you may not use this file except in compliance with the License. |
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%% You may obtain a copy of the License at |
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%% |
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%% http://www.apache.org/licenses/LICENSE-2.0 |
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%% |
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%% Unless required by applicable law or agreed to in writing, software |
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%% distributed under the License is distributed on an "AS IS" BASIS, |
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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%% See the License for the specific language governing permissions and |
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%% limitations under the License. |
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-module(pgec_mcd_emulator_text). |
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-export([recv/1]). |
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-include_lib("kernel/include/logger.hrl"). |
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-include_lib("stdlib/include/ms_transform.hrl"). |
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recv(#{message := #{command := quit}}) -> |
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:-( |
stop; |
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recv(#{message := #{command := get, keys := Keys}} = Arg) -> |
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?LOG_DEBUG(#{arg => Arg}), |
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{continue, |
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lists:foldl( |
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fun |
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(Key, A) -> |
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try lookup(ptk(Key)) of |
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{ok, #{metadata := Metadata, row := Row}} -> |
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?LOG_DEBUG(#{key => Key, |
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metadata => Metadata, |
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row => Row}), |
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[{encode, |
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#{command => value, |
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key => Key, |
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flags => 0, |
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expiry => 0, |
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data => jsx:encode(row(Metadata, Row))}} | A]; |
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not_found -> |
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?LOG_DEBUG(#{key => Key, lookup => not_found}), |
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A |
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catch |
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Class:Exception:Stacktrace -> |
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?LOG_DEBUG(#{class => Class, |
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exception => Exception, |
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stacktrace => Stacktrace}), |
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A |
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end |
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end, |
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[{encode, #{command => 'end'}}], |
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Keys)}; |
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recv(#{message := #{command := Command}} = Arg) -> |
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?LOG_DEBUG(#{arg => Arg}), |
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{continue, |
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{encode, |
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#{command => client_error, |
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reason => io_lib:format("~p: not implemented", [Command])}}}. |
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lookup(PTK) -> |
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?LOG_DEBUG(#{ptk => PTK}), |
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case metadata(PTK) of |
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[{_, Metadata}] -> |
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case lookup(Metadata, PTK) of |
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[Row] -> |
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{ok, #{metadata => Metadata, row => Row, ptk => PTK}}; |
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[] -> |
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not_found |
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end; |
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[] -> |
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:-( |
not_found |
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end. |
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lookup(Metadata, PTK) -> |
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Key = key(Metadata, PTK), |
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?LOG_DEBUG(#{metadata => Metadata, ptk => PTK, key => Key}), |
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case pgec_storage_sync:read(PTK#{key := Key}) of |
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{ok, Value} -> |
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[pgec_storage_common:row(Key, Value, Metadata)]; |
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not_found -> |
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[] |
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end. |
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key(Metadata, #{key := Encoded} = PTK) -> |
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?LOG_DEBUG(#{metadata => Metadata, ptk => PTK}), |
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pgec_kv:key(Metadata, string:split(Encoded, "/", all)). |
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metadata(#{publication := Publication, table := Table} = Arg) -> |
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?LOG_DEBUG(#{arg => Arg}), |
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case pgec_storage_sync:metadata(Arg) of |
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{ok, Metdata} -> |
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[{{Publication, Table}, Metdata}]; |
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not_found -> |
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:-( |
[] |
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end. |
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ptk(PTK) -> |
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?LOG_DEBUG(#{ptk => PTK}), |
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case string:split(PTK, ".", all) of |
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[Publication, Table, Key] -> |
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#{publication => Publication, table => Table, key => Key}; |
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_Otherwise -> |
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:-( |
error(badarg, [PTK]) |
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end. |
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row(Metadata, Row) -> |
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Result = pgec_kv:row(Metadata, <<"application/json">>, Row), |
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?LOG_DEBUG(#{metadata => Metadata, row => Row, result => Result}), |
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Result. |