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.
-p port : port number e.g. 8081 (no default). See #Usage. --mg : listens on port 8443. See #Usage. [-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
If Web security is an issue, use the command
- mhttpd --mg
to start the web server. See mhttpd HTTPS/SSL server for more information.
If Web Security is not a concern, or if running behind a firewall, the command mhttpd -p port can be used to start the web server (http version). In this case, 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
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
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 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).
HTTPS/SSL server (mongoose)
The HTTPS/SSL server is activated using "mhttpd --mg" (instead of -p) and it listens on port 8443.
The example SSL certificate provided in midas git is self-signed, for instructions on generating your own signed certificate, remove it and run "mhttpd --mg" - it will print the correct instructions.
Documentation for the version of mongoose included with MIDAS can be found at Mongoose documentation.
For more information see Elog note 1062