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Aegis key cache flow chart
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/raphael/2.2.7/raphael.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/js-sequence-diagrams/1.0.6/sequence-diagram-min.js"></script> | |
| </head> | |
| <body> | |
| <div id="diagram"></div> | |
| <script> | |
| var request = new XMLHttpRequest(); | |
| request.open('GET', 'sequence.txt', false); | |
| request.send(); | |
| var sequence = request.responseText; | |
| var diagram = Diagram.parse(sequence); | |
| diagram.drawSVG("diagram", {theme: 'simple'}); | |
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| Title: Aegis key cache flow chart | |
| participant aegis.erl | |
| participant aegis_key_cache.erl | |
| participant ets cache | |
| participant Openers | |
| participant Unwrappers | |
| participant Waiters | |
| participant worker process | |
| participant aegis_key_manager.erl | |
| Note over aegis.erl: Create Db | |
| aegis.erl->aegis_key_cache.erl: call {get_wrapped_key, Db} | |
| aegis_key_cache.erl->worker process: spawn_monitor get_wrapped_key(Db) | |
| aegis_key_cache.erl-->Openers: store {Ref, From} | |
| aegis_key_cache.erl->aegis.erl: noreply | |
| worker process->aegis_key_manager.erl: key_wrap(Db) | |
| aegis_key_manager.erl->worker process: {ok, DbKey, WrappedKey} | |
| worker process->aegis_key_cache.erl: DOWN {key, {ok, DbKey, WrappedKey}} | |
| aegis_key_cache.erl-->ets cache: insert {WrappedKey, DbKey} | |
| aegis_key_cache.erl-->Openers: take(Ref) | |
| Openers-->aegis_key_cache.erl: {Ref, From} | |
| aegis_key_cache.erl->aegis.erl: gen_server:reply(From, WrappedKey) | |
| # Note over aegis.erl: Open Db | |
| # aegis.erl->aegis_key_cache.erl: call {maybe_rewrap_key, Db} | |
| # aegis_key_cache.erl->worker process: spawn_monitor unwrap_key(From, Db) | |
| # aegis_key_cache.erl-->Openers: store {Ref, From} | |
| # aegis_key_cache.erl-->Unwrappers: store {WrappedKey, Ref} | |
| # aegis_key_cache.erl->aegis.erl: noreply | |
| # worker process->aegis_key_manager.erl: key_unwrap(Db) | |
| # aegis_key_manager.erl->worker process: {ok, DbKey, WrappedKey} | |
| # worker process->aegis_key_cache.erl: DOWN {key, {ok, DbKey, WrappedKey}} | |
| # Unwrappers-->aegis_key_cache.erl: take {WrappedKey, Ref} /confirm source/ | |
| # aegis_key_cache.erl-->ets cache: insert {WrappedKey, DbKey} | |
| # Openers-->aegis_key_cache.erl: take {Ref, From} | |
| # aegis_key_cache.erl->aegis.erl: gen_server:reply(From, WrappedKey) | |
| Note over aegis.erl: Encrypt key in cache | |
| aegis.erl->aegis_key_cache.erl: call {encrypt, Db,..} | |
| aegis_key_cache.erl-->ets cache: lookup(WrappedKey) | |
| ets cache-->aegis_key_cache.erl: {ok, DbKey} | |
| aegis_key_cache.erl->worker process: spawn do_encrypt(From, DbKey, Db,..) | |
| aegis_key_cache.erl->aegis.erl: noreply | |
| Note over worker process: aegis:encrypt(DbKey,..) | |
| worker process->aegis.erl: gen_server:reply(From, <<1:8...>>) | |
| Note over aegis.erl: Encrypt key not in cache | |
| aegis.erl->aegis_key_cache.erl: call {encrypt, Db,..} | |
| aegis_key_cache.erl-->ets cache: lookup(WrappedKey) | |
| ets cache-->aegis_key_cache.erl: not_found | |
| aegis_key_cache.erl-->Unwrappers: is_key(WrappedKey) /check if unwrap in flight/ | |
| Unwrappers-->aegis_key_cache.erl: false | |
| aegis_key_cache.erl->worker process: spawn_monitor unwrap_key(Db) | |
| aegis_key_cache.erl-->Unwrappers: store {WrappedKey, Ref} | |
| aegis_key_cache.erl-->Waiters: append {WrappedKey, {from => From, action=>...}} | |
| aegis_key_cache.erl->aegis.erl: noreply | |
| worker process->aegis_key_manager.erl: key_unwrap(Db) | |
| aegis_key_manager.erl->worker process: {ok, DbKey, WrappedKey} | |
| worker process->aegis_key_cache.erl: DOWN {key, {ok, DbKey, WrappedKey}} | |
| aegis_key_cache.erl-->Unwrappers: take(WrappedKey) | |
| Unwrappers-->aegis_key_cache.erl: {WrappedKey, Ref} /check if Ref match/ | |
| aegis_key_cache.erl-->ets cache: insert {WrappedKey, DbKey} | |
| aegis_key_cache.erl-->Waiters: take(WrappedKey) | |
| Waiters-->aegis_key_cache.erl: {WrappedKey, WaitList} | |
| aegis_key_cache.erl->worker process: foreach spawn do_encrypt(From, DbKey, Db,..) | |
| Note over worker process: aegis:encrypt(DbKey,..) | |
| worker process->aegis.erl: gen_server:reply(From, <<1:8...>>) |
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