make DOT file for graphviz, from BQL

• sensorbee http://sensorbee.io/
  • v0.5.1
• cli https://github.com/urfave/cli
  • v1.18.0

$ go get github.com/disktnk/bqldot
$ cd $GOPATH/src/github.com/disktnk/bqldot
$ go install

$ bqldot path/to/bqlfile/foo.bql

"foo.dot" will be made.

"sample.bql" is put on "sample" directory

$ bqldot -t topology_name sample.bql # "sample.dot" will be made
$ dot -Tgif sample.dot -o sample_graph.gif

Visualized as:

• A UDSF node is not enough to represent the stream. To be completed, use built sensorbee to read UDSF implementation. (And bqldot should be subcommand of sensorbee.)
• Write keys on each stream nodes.
• A UDS edge. (It is difficult because topology_builder does not link UDSs and other nodes, UDSs are read after streaming)

• graphviz http://www.graphviz.org/
  • The DOT language http://www.graphviz.org/content/dot-language