The following changes have been made to the Travis CI:
* The cache timeout has been increased, before builds would spend three minutes trying to cache something before giving up.
* The toolchain for building and testing has been switched to stable. A nightly version is still used to run `clippy` and `rustfmt`; however in both cases the toolchain binaries are used instead of compiling them from scratch.
* The `cargo check` pass has been removed; it simply tested whether or not the crate compiled against stable before compiling again against release. As there very, very few bugs that will cause a mismatch here (differences will be in execution), a trade-off was made in favor of compiling only once.
This fixes several issues with the broadcast algorithm and enables the
previously ignored tests that now pass:
* Don't decide on a root hash based on anyone's `Echo` message.
* Work around the `merkle` crate's inability to produce the proof of the
`i`-th leaf for a given index `i`.
* Ignore messages from unknown nodes.
* Avoid decoding multiple times.
* Document the full algorithm.
* Don't count multiple `Echo` or `Ready` messages coming from the same
node.
* Fix index computation for a given proof.
* Move `BroadcastMessage` into `broadcast` to make the module more
self-contained.
The example now only executes a single broadcast instance, expecting the
first node (the one with the lexicographically lowest address) to
propose a value. A shell script is added that runs for example nodes.
Use env_logger instead of simple_logger, so the log level can be controlled
with an environment variable. You can e.g. log all output from the broadcast
test and the crate itself in debug mode with:
RUST_LOG=hbbft=debug,broadcast=debug
Some debugging messages are more concise now and use hexadecimal
notation instead of printing arrays of decimal values.
An indentation error in the Travis script is also fixed.
Andreas Fackler
Peter van Nostrand
Marc Brinkmann
Vladimir Komendantskiy