This pr changes the collator interface function to return an optional
collation instead of a collation. This is required as the parachain
itself can fail to generate a valid collation for various reason. Now if
the collation fails it will return `None`.
Besides that the pr adds some `RuntimeDebug` derive for `ValidationData`
and removes some whitespaces.
* Guide: Change for {Global,Local}ValidationData to ValidationData
Seems like that was missed during the transition from notions of global and local validation data to persistent and transient
* collation-generation: a small drive-by fix of line length
* collation-generation: extract an error module
this allows us to avoid piling Error and Result types from different contexts, specifically std vs. module-local
* collation-generation: extract LOG_TARGET from log statements
* guide: validation data refactoring
* address grumbles from review
* Update roadmap/implementers-guide/src/types/candidate.md
Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>
* last comments from review
Co-authored-by: Sergei Shulepov <sergei@parity.io>
Co-authored-by: Bernhard Schuster <bernhard@ahoi.io>
* Do a small write-up on collation-generation
* preamble to collator protocol
* notes on protocol
* collation-generation: point to collator protocol
* fix missing bracket
* expand on collator protocol wire protocol
* add a couple more sentences
* expand on requests some more
* go higher level
* network bridge: note peerset
* note peer-set = validation for protocols
* add `ConnectToValidators` message
* use ConnectToValidators in collator protocol
* typo
* remove references to sentry nodes