version 1 .
embeddedType EntityRef.Cap .

# ---------------------------------------------------------------------------
# Protocol at *gatekeeper* entities

# Assertion. Gatekeeper will attempt to resolve `step`, responding with a `Resolved` to
# `observer`.
Resolve = <resolve @step Step @observer #!Resolved> .
Resolved = <accepted @responderSession #!any> / Rejected .
Step = <<rec> @stepType symbol [@detail any]> .

# ---------------------------------------------------------------------------
# Protocol at dataspaces *associated* with gatekeeper entities

# Assertion. Gatekeeper will compute an appropriate PathStep from `description` pointing at
# `target`, and will respond with a `Bound` to `observer` (if supplied).
Bind = <bind @description Description @target #!any @observer BindObserver> .
Description = <<rec> @stepType symbol [@detail any]> .
BindObserver = @present #!Bound / @absent #f .
Bound = <bound @pathStep PathStep> / Rejected .

# ---------------------------------------------------------------------------
# Protocol at client-side dataspaces, for resolution utilities

# Assertion. In response to observation of this with appropriate captures/wildcards in `addr`
# and `resolved`, respondent will follow `route.pathSteps` starting from one of the
# `route.transports`, asserting `ResolvePath` with the final `Resolved` as well as the selected
# transport `addr` and a `control` for it.
ResolvePath = <resolve-path @route Route @addr any @control #!TransportControl @resolved Resolved> .

TransportConnection = <connect-transport @addr any @control #!TransportControl @resolved Resolved> .
ResolvedPathStep = <path-step @origin #!Resolve @pathStep PathStep @resolved Resolved> .
PathStep = <<rec> @stepType symbol [@detail any]> .

# A `Route` describes a network path that can be followed to reach some target entity.
#
# It starts with a set of zero or more possible non-Syndicate `transports`. These could be
# `transportAddress.Tcp` values or similar. They are just suggestions; it's quite possible the
# endpoint is reachable by some means not listed. The network outside Syndicate is, after all,
# pretty diverse! In particular, *zero* `transports` may be provided, in which case some
# out-of-band means has to be used to make that first connection.
#
# The `transports` give instructions for contacting the first entity in the `Route` path. Often
# this will be a `gatekeeper`, or a `noise` protocol endpoint, or both. Occasionally, it may
# even be the desired target entity. Subsequent `pathSteps` describe how to proceed from the
# initial entity to the target.
#
# (`transports` should by rights be a set, not a sequence, but that opens up a Can Of Worms
# regarding dataspace patterns including literal sets that I can't deal with right now.)
Route = <route @transports [any ...] @pathSteps PathStep ...> .

TransportControl = ForceDisconnect .
ForceDisconnect = <force-disconnect> .

# ---------------------------------------------------------------------------

Rejected = <rejected @detail any> .