Mhttpd
Links
Purpose
The mhttpd utility runs the MIDAS Web Server which allows the user to communicate with an experiment using any web browser. It is used primarily for run control.
Arguments
-p port : port number e.g. 8081 (no default) [-h hostname ] : see Common Parameters to MIDAS Utilities [-e experiment] : see Common Parameters to MIDAS Utilities [-v] : display verbose HTTP communication [-D] : starts program as a daemon [-E] : only display ELog system [-H] : only display history plots [-a hostname] : only allow access for specific host(s). Several [-a Hostname] statements might be given [-help] : display usage information
Usage
The TCP/IP port number is required as an argument in order to listen to the web-based request.
e.g. if mhttpd is started on IP host machine "myhost" on port 8081 as follows
mhttpd -p 8081 -D
access to the Midas status page can be obtained by pointing a web browser to
http://myhost.mydomain:8081
- Note
If multiple experiments run on the same host, a web server for each experiment must be started on a different port, e.g.
mhttpd -e expt1 -p 8081 -D
mhttpd -e expt2 -p 8082 -D
Features
Mhttpd provides a means for run control including monitoring of the run parameters. Its main feature is a web page invoked through any web browser accessing the Midas experimental URL at a defined port (see Usage).
The contents of this Midas status page is composed with minimal information relative to the experiment. It contains a collection of buttons and links to other pages to further describe and control the configuration of the experiment.
- Minimal display on the main Status Page
- Experiment name, time & date, page refresh rate
- Standard Menu Buttons (see below)
- User defined buttons (e.g. alias links, run scripts, custom pages etc.)
- run comments and condition display section (if enabled)
- Equipment list with current running condition, number of event received, event rate, data rate for each equipment.
- Data logging statistics (number of event recorded, data size recorder, compression factor, usage storage level) if enabled.
- Secondary Data logging (data mover) with statistics if enabled.
- Single line of the most recent Midas message.
- Table of the current applications connected to this experiment.
- Standard Menu Buttons
- Transition the state of the run (stopped/running/paused), allows user running condition parameters to be entered at the start state (see Edit-on-start Parameters).
- Access to the full Online Database for data display and/or data content modification.
- Display the Message Page, which shows messages generated by the MIDAS [Message System]] as well as the user using cm_msg() functions.
- Access to ELOG Page switches to the predefined "electronic logbook".
- Access to the Alarms Page for monitoring the different type of alarms (evaluated, programs, internals, periodic).
- Access to the Programs Page for a status or interaction with the current running applications part of the Midas experiment.
- Access to the History Page for graphical data representation of any ODB variables and acquired data.
- Access to the Midas Slow Control Bus devices MSCB Page connected to this experiment.
- Access to the Sequencer Page control/monitoring page for Sequencer i.e. interactive loading/saving/running of a run sequence based on any ODB parameters.
- Access to the Help Page with short-cut to the Midas Help documentation resource and other information.
- Links
- links to all the listed equipments invoking a dedicated page for the display and possible control of the equipment parameters.
- link to the logger configuration (if present) for the data recording.
- link to the possible secondary logging configuration parameters (if present).
Other features include a JSON interface and Javascript library used for implementing interactive custom pages for MIDAS experiments.