78 lines
3.2 KiB
Nim
78 lines
3.2 KiB
Nim
# Copyright (c) 2018-2023 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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import
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chronos, chronicles, presto/client,
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"."/[rest_types, eth2_rest_serialization, rest_common]
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proc getValidatorsActivity*(epoch: Epoch,
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body: seq[ValidatorIndex]
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): RestPlainResponse {.
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rest, endpoint: "/nimbus/v1/validator/activity/{epoch}",
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meth: MethodPost.}
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proc getTimesyncInifo*(body: RestNimbusTimestamp1): RestPlainResponse {.
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rest, endpoint: "/nimbus/v1/timesync", meth: MethodPost.}
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proc getTimeOffset*(client: RestClientRef,
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delay: Duration): Future[int64] {.async.} =
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let
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timestamp1 = getTimestamp()
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data = RestNimbusTimestamp1(timestamp1: timestamp1)
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resp = await client.getTimesyncInifo(data)
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timestamp4 = getTimestamp()
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return
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case resp.status
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of 200:
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if resp.contentType.isNone() or
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isWildCard(resp.contentType.get().mediaType) or
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resp.contentType.get().mediaType != ApplicationJsonMediaType:
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raise newException(RestError, "Missing or incorrect Content-Type")
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let stamps = decodeBytes(RestNimbusTimestamp2, resp.data,
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resp.contentType).valueOr:
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raise newException(RestError, $error)
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trace "Time offset data",
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timestamp1 = timestamp1,
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timestamp2 = stamps.timestamp2,
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timestamp3 = stamps.timestamp3,
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timestamp4 = timestamp4,
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delay14 = delay.nanoseconds,
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delay23 = stamps.delay
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# t1 - time when we sent request.
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# t2 - time when remote server received request.
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# t3 - time when remote server sent response.
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# t4 - time when we received response.
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# delay14 = validator client processing delay.
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# delay23 = beacon node processing delay.
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#
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# Round-trip network delay `delta` = (t4 - t1) - (t3 - t2)
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# but with delays this will be:
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# `delta` = (t4 - t1 + delay14) - (t3 - t2 + delay23)
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# Estimated server time is t3 + (delta div 2)
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# Estimated clock skew `theta` = t3 + (delta div 2) - t4
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let
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delay14 = delay.nanoseconds
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delay23 = int64(stamps.delay)
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offset = (int64(stamps.timestamp2) - int64(timestamp1) +
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int64(stamps.timestamp3) - int64(timestamp4) +
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delay14 - delay23) div 2
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offset
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else:
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let error = decodeBytes(RestErrorMessage, resp.data,
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resp.contentType).valueOr:
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let msg = "Incorrect response error format (" & $resp.status &
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") [" & $error & "]"
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raise (ref RestResponseError)(msg: msg, status: resp.status)
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let msg = "Error response (" & $resp.status & ") [" & error.message & "]"
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raise (ref RestResponseError)(
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msg: msg, status: error.code, message: error.message)
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