A Big Line feeder
npm install node-red-contrib-bigline"Line" parser for Big Nodes. Following the "big csv" and "big file" implementations, here is a node working the same way
bash
npm install node-red-contrib-bigline
`Principles for Big Nodes
See biglib for details on Big Nodes.
and subsequent Big Nodes are a family of nodes built for my own purpose. They are all designed to help me build a complete process for production purposes. For that I needed nodes able to:* Flow big volume of data (memory control, work with buffers)
Work with a flow of blocks* (buffers) (multiple payload within a single job)
Tell what they are doing* with extended use of statuses (color/message)
Use their second output for flow control* (start/stop/running/status)
Reuse messages* in order to propagate _msgid, topic
* Depends on state of the art libraries for parsing (csv, xml, xlsxs, line, ...)
* Acts as filters by default (1 payload = 1 action) or data generators (block flow)
All functionnalities are built under a library named
biglib and all Big Nodes rely on itUsages
Big Line is a filter node for node-red to transform data into lines, one message per line. It uses the "byline" library
It works as a filter node that means it takes in the output of a "big file" node or any block node. It's able to read a file by itself to send lines
It has two options as byline offers them:
* data format (utf8, latin, hexdec, base64, ucs2 and ascii). This option is only used when reading a file
* keep empty lines
It has a filename property used to read files in the specific given data format*
Dependencies
byline simple line-by-line stream reader
biglib library for building node-red flows that supports blocks, high volume
Example flow files
Try pasting in the flow file below that shows the node behaviour
`json
[{"id":"7f677e4c.80988","type":"inject","z":"d7f0f148.280f1","name":"GO","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"x":430,"y":120,"wires":[["23aa1547.dc55ea"]]},{"id":"23aa1547.dc55ea","type":"function","z":"d7f0f148.280f1","name":"sample data","func":"msg.control = { state: \"standalone\" }\nmsg.payload = \"This is a line\\nThis is a second line\\n\\nThis is a ending line\"\nreturn msg;","outputs":1,"noerr":0,"x":610,"y":200,"wires":[["f219f15e.0de61"]]},{"id":"f219f15e.0de61","type":"bigline","z":"d7f0f148.280f1","name":"big line","filename":"","format":"utf8","keepEmptyLines":true,"x":800,"y":280,"wires":[["e68deb8e.197218"],["e1300565.1ecff8"]]},{"id":"e68deb8e.197218","type":"debug","z":"d7f0f148.280f1","name":"lines","active":true,"console":"false","complete":"payload","x":970,"y":200,"wires":[]},{"id":"e1300565.1ecff8","type":"debug","z":"d7f0f148.280f1","name":"status","active":true,"console":"false","complete":"control","x":970,"y":340,"wires":[]},{"id":"220d8b4e.ddf274","type":"inject","z":"d7f0f148.280f1","name":"GO keep empty lines","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"x":140,"y":220,"wires":[["d72e181d.28d1e8"]]},{"id":"6d8a0609.9275f8","type":"inject","z":"d7f0f148.280f1","name":"GO ignore empty lines","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"x":140,"y":300,"wires":[["d6aad846.295528"]]},{"id":"d6aad846.295528","type":"function","z":"d7f0f148.280f1","name":"keepEmptyLines=false","func":"msg.config = { keepEmptyLines: false }\nreturn msg;","outputs":1,"noerr":0,"x":380,"y":280,"wires":[["23aa1547.dc55ea"]]},{"id":"d72e181d.28d1e8","type":"function","z":"d7f0f148.280f1","name":"keepEmptyLines=true","func":"msg.config = { keepEmptyLines: true }\nreturn msg;","outputs":1,"noerr":0,"x":380,"y":200,"wires":[["23aa1547.dc55ea"]]},{"id":"44d2ade5.bb2d54","type":"comment","z":"d7f0f148.280f1","name":"This node accepts on the fly configuration","info":"","x":189,"y":150,"wires":[]},{"id":"396f3087.c690d","type":"comment","z":"d7f0f148.280f1","name":"4 lines of data with 1 empty line","info":"","x":690,"y":160,"wires":[]},{"id":"1aa13977.e55ec7","type":"comment","z":"d7f0f148.280f1","name":"control messages (start, stop, ...)","info":"","x":1050,"y":380,"wires":[]},{"id":"86fb9d2f.79046","type":"comment","z":"d7f0f148.280f1","name":"One message per line","info":"","x":1020,"y":240,"wires":[]},{"id":"a92d08b1.56d2f8","type":"comment","z":"d7f0f148.280f1","name":"Simple trigger","info":"","x":450,"y":80,"wires":[]},{"id":"24787944.db8786","type":"inject","z":"d7f0f148.280f1","name":"GO with an error","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"x":120,"y":360,"wires":[["aa1b01cb.55e5"]]},{"id":"aa1b01cb.55e5","type":"function","z":"d7f0f148.280f1","name":"Non existing file","func":"msg.filename = \"/A/Probably/Non/Existing/File\"\nreturn msg;","outputs":1,"noerr":0,"x":600,"y":360,"wires":[["f219f15e.0de61"]]},{"id":"83a230ab.7c5dd","type":"comment","z":"d7f0f148.280f1","name":"Big Line sample usage","info":"","x":120,"y":40,"wires":[]}]
``- Jacques W
This code is Open Source under an Apache 2 License.
You may not use this code except in compliance with the License. You may obtain an original copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
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