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History

Dmitry Shulyak 707221954f

Make whisper tolerant to local time skews (#864 )

This change adds adds an ability to use different source of time for whisper:

when envelope is created it is used to set expiry
to track when envelope needs to be expired
This time is then used to check validity of the envelope when it is received. Currently If we receive an envelope that is sent from future - peer will get disconnected. If envelope that was received has an expiry less then now it will be simply dropped, if expiry is less than now + 10*2 seconds peer will get dropped.

So, it is clear that whisper depends on time. And any time we get a skew with peers that is > 20s reliability will be grealy reduced.

In this change another source of time for whisper will be used. This time source will use ntp servers from pool.ntp.org to compute offset. When whisper queries time - this offset will be added/substracted from current time.

Query is executed every 2 mins, queries 5 different servers, cut offs min and max and the computes mean value. pool.ntp.org is resolved to different servers and according to documentation you will rarely hit the same.

Closes: #687

2018-05-04 11:23:38 +03:00

dedup

Add shhext_getNewFilterMessages function to RPC APIs.

2018-04-27 15:24:37 +02:00

api.go

Make whisper tolerant to local time skews (#864 )

2018-05-04 11:23:38 +03:00

README.md

Add doc for shhext_requestMessages (#872 )

2018-04-27 13:59:01 +02:00

service_test.go

Make whisper tolerant to local time skews (#864 )

2018-05-04 11:23:38 +03:00

service.go

Add shhext_getNewFilterMessages function to RPC APIs.

2018-04-27 15:24:37 +02:00

signal.go

Move signal logic into signal package

2018-05-03 09:35:58 +02:00

README.md

Whisper API Extension

API

shhext_post

Accepts same input as shh_post (see https://github.com/ethereum/wiki/wiki/JSON-RPC#shh_post)

Returns

DATA, 32 Bytes - the envelope hash

shhext_requestMessages

Sends a request for historic messages to a mail server.

Parameters

Object - The message request object:

mailServerPeer:URL - Mail servers' enode addess
from:QUANTITY - (optional) Lower bound of time range as unix timestamp, default is 24 hours back from now
to:QUANTITY- (optional) Upper bound of time range as unix timestamp, default is now
topic:DATA, 4 Bytes - Regular whisper topic
symKeyID:DATA- ID of a symmetric key to authenticate to mail server, derived form mail server password

Returns

Boolean - returns true if the request was send, otherwise false.

Signals

Sends sent signal once per envelope.

{
  "type": "envelope.sent",
  "event": {
    "hash": "0xea0b93079ed32588628f1cabbbb5ed9e4d50b7571064c2962c3853972db67790"
  }
}

Sends expired signal if envelope dropped from whisper local queue before it was sent to any peer on the network.

{
  "type": "envelope.expired",
  "event": {
    "hash": "0x754f4c12dccb14886f791abfeb77ffb86330d03d5a4ba6f37a8c21281988b69e"
  }
}