The !thumbup Bot Command on Steem Blockchain (Updates and Improvements)

You can invoke the thumbup bot by having "!thumbup" in the comment, like this:

A random GIF (of thumbup images) from giphy will be shown. The images are now stored on local servers to improve the robustness/availability.

So far, there are 51 gifs (these are chosen in advance) because:

1. no surprise compared to calling the GIPHY api.
2. images are always available because the copies have been saved to local server(s).

Current problems:

1. The bot listens to the transactions on the chain at real time, if it misses it, it won't go back to scan and action.
2. The RPC node may not work as expected. There is a failover, but it happened that the node fails to respond the steem.api.streamOperations

Future work:

1. when thumbup, give a small upvote (automatically).
2. scale the deployment horizontally, so there is a backup to avoid single point of failure.

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