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https://github.com/logos-messaging/nim-ffi.git
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48 lines
1.6 KiB
Nim
48 lines
1.6 KiB
Nim
import std/tables
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import chronos
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################################################################################
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### Exported types
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type FFICallBack* = proc(
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callerRet: cint, msg: ptr cchar, len: csize_t, userData: pointer
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) {.cdecl, gcsafe, raises: [].}
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const RET_OK*: cint = 0
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const RET_ERR*: cint = 1
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const RET_MISSING_CALLBACK*: cint = 2
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### End of exported types
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################################################################################
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################################################################################
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### FFI utils
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type FFIRequestProc* = proc(
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request: pointer, reqHandler: pointer
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): Future[Result[seq[byte], string]] {.async.}
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## The OK payload is a CBOR-encoded response body. Errors are plain UTF-8.
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template foreignThreadGc*(body: untyped) =
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when declared(setupForeignThreadGc):
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setupForeignThreadGc()
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body
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when declared(tearDownForeignThreadGc):
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tearDownForeignThreadGc()
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## Registered requests table populated at compile time and never updated at run time.
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## The key represents the request type name as cstring, e.g., "CreateNodeRequest".
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## The value is a proc that handles the request asynchronously.
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var registeredRequests*: Table[cstring, FFIRequestProc]
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## Per-request handler-timeout overrides in milliseconds, keyed by the same Req
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## type name as `registeredRequests`. Populated at compile time from a
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## `{.ffi: "timeout = <ms>".}` spec; an absent key means "use the context's
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## `defaultRequestTimeout`". Like `registeredRequests`, never mutated at run time.
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var requestTimeoutsMs*: Table[cstring, int]
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### End of FFI utils
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################################################################################
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