there is no api to get messages in latest ts

[hunjixin]

Describe the solution you'd like
i want to add a api ***MessageForTipset ***that can return messages in specify tipset key, but not return parent tipset message. i have no way to get messages in latest tipset.

[f8-ptrk]

messages are organized in blocks, not tipsets

get the tipset https://github.com/filecoin-project/lotus/blob/master/api/api_full.go#L82
get each block in the tipset https://github.com/filecoin-project/lotus/blob/master/api/api_full.go#L80
get messages per block https://github.com/filecoin-project/lotus/blob/master/api/api_full.go#L96

[hunjixin]

@f8-ptrk @jennijuju yes. i can copy the code of blockmsgfortipset to implete a tipset message select in local code. but i must call StateLookupId. this func may be invoked for many times. this code maybe cost a few seconds on network. and hundreds ms in local machine. on the other hand, blockmsgfortipset has relation to network upgrade and different network. this will make my code more complicated. so hope to have such a api to get messages that really to be process in tipset

[f8-ptrk]

i am sure a parallelized constant lookup api call routine of tipsets-blocks-messages will be faster then a single gettipsetmessages api call if implemented right "client" side in your code

[arajasek]

Thanks for the PR! Let's track discussion there.