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92 lines
3.4 KiB
Erlang
92 lines
3.4 KiB
Erlang
-module(pipeline).
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-export([run_stages/2,
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validate_inbound/1, validate_outbound/1,
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inbound_stages/0, outbound_stages/0,
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stage_envelope/1,
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stage_signature/1, stage_signature/2,
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stage_replay/1, stage_replay/2]).
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%% Validation pipeline per design §14.
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%%
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%% A stage is a 1-arity fun `(Activity) -> ok | {error, Reason}`.
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%% The driver folds the activity through the stage list, halting
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%% on the first error. The pure-functional driver itself takes a
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%% stage list directly so tests can inject ad-hoc stage sequences
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%% without depending on the bundled inbound/outbound lists.
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%%
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%% Inbound pipeline (full set per design §14): envelope, signature,
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%% replay, audience, activity_schema, object_schema, content_validators,
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%% capabilities, trust. Outbound is a subset (no replay, no trust;
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%% auth handled at the HTTP layer).
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%%
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%% This sub-deliverable (6a) wires only the driver and the empty
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%% stage lists. Concrete stages land in 6b-6c.
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run_stages(_Activity, []) -> ok;
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run_stages(Activity, [Stage | Rest]) ->
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Result = Stage(Activity),
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case Result of
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ok -> run_stages(Activity, Rest);
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{error, _} -> Result
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end.
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validate_inbound(Activity) ->
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run_stages(Activity, inbound_stages()).
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validate_outbound(Activity) ->
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run_stages(Activity, outbound_stages()).
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inbound_stages() ->
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[fun (A) -> stage_envelope(A) end].
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outbound_stages() ->
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[fun (A) -> stage_envelope(A) end].
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%% ── Concrete stages ─────────────────────────────────────────────
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%% stage_envelope/1 — wrap envelope:validate_shape/1. The pipeline
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%% driver expects ok | {error, R}; validate_shape returns exactly
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%% that, so delegation is direct.
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stage_envelope(Activity) ->
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envelope:validate_shape(Activity).
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%% stage_signature/2 — direct (Activity, ActorState) check. Wraps
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%% envelope:verify_signature/2 from Step 2c. Useful for tests and
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%% for callers that already have ActorState in scope.
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stage_signature(Activity, ActorState) ->
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envelope:verify_signature(Activity, ActorState).
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%% stage_signature/1 — factory: takes the ActorState and returns a
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%% 1-arity stage fun the pipeline driver can fold. This is how
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%% signature checking gets composed into a stage list at runtime
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%% (the static `inbound_stages/0` list omits it precisely because
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%% ActorState isn't available at static-list build time).
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stage_signature(ActorState) ->
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fun (Activity) -> envelope:verify_signature(Activity, ActorState) end.
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%% stage_replay/2 — checks the in-memory log for an existing
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%% activity with the same :id. Returns ok if the activity is new,
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%% `{error, replay}` if the log already carries it, `{error, no_id}`
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%% if the activity has no :id field. The check is linear scan of
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%% log entries; the projection scheduler (Step 7) will eventually
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%% maintain a CID index that turns this into O(1).
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stage_replay(Activity, LogState) ->
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case envelope:get_field(id, Activity) of
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not_found -> {error, no_id};
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{ok, Id} ->
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case log_has_id(Id, log:entries(LogState)) of
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true -> {error, replay};
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false -> ok
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end
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end.
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stage_replay(LogState) ->
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fun (Activity) -> stage_replay(Activity, LogState) end.
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log_has_id(_, []) -> false;
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log_has_id(Id, [Act | Rest]) ->
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case envelope:get_field(id, Act) of
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{ok, Id} -> true;
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_ -> log_has_id(Id, Rest)
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end.
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