Function ssb_validate::message::par_validate_message_hash_chain_of_feed

pub fn par_validate_message_hash_chain_of_feed<T: AsRef<[u8]>, U: AsRef<[u8]>>(
    messages: &[T], 
    previous: Option<U>
) -> Result<()> where
    [T]: ParallelSlice<T>,
    T: Sync,
    U: Sync + Send + Copy, 

Batch validates a collection of messages, all by the same author, ordered by ascending sequence number, with no missing messages.

It expects the messages to be the JSON encoded message of shape: {key: "", value: {...}}

This will mainly be useful during replication. Collect all the latest messages from a feed you’re replicating and batch validate all the messages at once.

Example

use ssb_validate::message::par_validate_message_hash_chain_of_feed;
let valid_message_1 = r##"{
  "key": "%/v5mCnV/kmnVtnF3zXtD4tbzoEQo4kRq/0d/bgxP1WI=.sha256",
  "value": {
    "previous": null,
    "author": "@U5GvOKP/YUza9k53DSXxT0mk3PIrnyAmessvNfZl5E0=.ed25519",
    "sequence": 1,
    "timestamp": 1470186877575,
    "hash": "sha256",
    "content": {
      "type": "about",
      "about": "@U5GvOKP/YUza9k53DSXxT0mk3PIrnyAmessvNfZl5E0=.ed25519",
      "name": "Piet"
    },
    "signature": "QJKWui3oyK6r5dH13xHkEVFhfMZDTXfK2tW21nyfheFClSf69yYK77Itj1BGcOimZ16pj9u3tMArLUCGSscqCQ==.sig.ed25519"
  },
  "timestamp": 1571140551481
}"##;
let valid_message_2 = r##"{
  "key": "%kLWDux4wCG+OdQWAHnpBGzGlCehqMLfgLbzlKCvgesU=.sha256",
  "value": {
    "previous": "%/v5mCnV/kmnVtnF3zXtD4tbzoEQo4kRq/0d/bgxP1WI=.sha256",
    "author": "@U5GvOKP/YUza9k53DSXxT0mk3PIrnyAmessvNfZl5E0=.ed25519",
    "sequence": 2,
    "timestamp": 1470187292812,
    "hash": "sha256",
    "content": {
      "type": "about",
      "about": "@U5GvOKP/YUza9k53DSXxT0mk3PIrnyAmessvNfZl5E0=.ed25519",
      "image": {
        "link": "&MxwsfZoq7X6oqnEX/TWIlAqd6S+jsUA6T1hqZYdl7RM=.sha256",
        "size": 642763,
        "type": "image/png",
        "width": 512,
        "height": 512
      }
    },
    "signature": "j3C7Us3JDnSUseF4ycRB0dTMs0xC6NAriAFtJWvx2uyz0K4zSj6XL8YA4BVqv+AHgo08+HxXGrpJlZ3ADwNnDw==.sig.ed25519"
  },
  "timestamp": 1571140551485
}"##;
 let messages = [valid_message_1.as_bytes(), valid_message_2.as_bytes()];
 // If you're passing `None` as the `previous` argument you'll need to give the compiler a hint about
 // the type.
 let result = par_validate_message_hash_chain_of_feed::<_, &[u8]>(&messages, None);
 assert!(result.is_ok());