subscribers that can filter-out what they need and then do whatever they want
with the data. Status bar is one such subscriber:
-`P1 > pipe&; P2 > pipe&; ... PN > pipe&; tail -f pipe | tee >(S1) >(S2) ... >(SN) > /dev/null
+`P1 > pipe&; P2 > pipe&; ... PN > pipe&; tail -f pipe | tee >(S1) >(S2) ... >(SN) > /dev/null`
The cool thing is that, because the pipe is always read (`tail -f ... > /dev/null`),
-the publishers are never blocked, so we get a live stream of event to which we
+the publishers are never blocked, so we get a live stream of events to which we
can attach any number of interested subscribers (` ... tee ... `) and, because
the pipe is named, if a subscriber needs to - it too can publish something to
the pipe without being blocked.
TODO
----
+- tests (design is starting to take shape, so it is time)
+- show how many Debian package updates are available
+- show how many Debian package security-updates are available
+- monitor disk usage rate of change and alert if suspiciously fast
+- bring back CPU usage monitor
+- actual METAR parser, to replace the flaky `metar` program
- status bar templating language
- retry/cache for sensors fetching flaky remote resources (such as weather)
- throttling of broken sensors (constantly returns errors)
- priority
- snooze time (if already alerted, when to re-alert?)
- text: subject/body
+- monitor processes
+ - totals (grand and per state)
+ - zombies
+ - threads
+ - CPU hogs
+ - memory hogs
+ - memory leaks (if some process consistently grows)
+ - is select process up?
+ - log resource usage of select processes
+- monitor arbitrary HTTP endpoint availability
+ - is status within expected range?
+ - response time
+ - is responce time within acceptable range?
+- report detailed status upon request (to a terminal)
+ - use color to indicate age of data
+- monitor logins
+ - totals (per time period)
+ - failures
+ - successes
+ - most recent
+ - success
+ - failure
+- monitor battery time remaining
+ - monitor accuracy (is percentage change rate on track to meet estimate?)
+ - adjust estimate based on observed inaccuracies in past estimates (Kalman?)
Redesign notes
--------------
- controller should not do formatting
- need in-memory db for diskless feedback/throttling and cache
+- decouple sensor execution from sleep, i.e. a sensor is blocked not by sleep
+ process directly, but by reading of a pipe, to where a sleep process will
+ write a message announcing interval completion and thus signaling execution.
+ This will allow us to manually signal a sensor to update (concretely - I just
+ openned my laptop from sleep and want to force the weather to update
+ immediately); likewise, the sleep process should be blocked on pipe-read
+ until sensor execution is complete - this will allow us to reconfigure
+ intervals at runtime (which seems like a better idea than the above in-memory
+ DB one).
+
+Ideas
+-----
+
+- daemonize `khatus`, so we don't have to re-launch `X11` to re-launch `khatus`
+- interoperate with other khatus instances
+ - prefix machine ID to each data source
+ (What should that ID be? Hostname? Pub key?)
+ - fetch remote data and process locally
+ - what transport to use?
+ - ssh + rsync + cache dumps per some interval?
+ - `A` can setup self penetration testing, by setting up probe of `A` on `B`
+ and fetching results from `B` to `A`
+- offline mode - quick disable all network-using subsystems (sensors, monitors, etc)
+- classify each sensor as either "local" or "remote" (what about `iwconfig`, et al?)
+- store data with rrdtool
+- some kind of personal calendar thing integration
+- monitor tracking numbers (17track should be easiest to get started with)
+- monitor password digests against known leaked password databases
+- monitor stock prices
+- monitor some item price(s) at some store(s) (Amazon, etc.)
+ - https://docs.aws.amazon.com/AWSECommerceService/latest/DG/EX_RetrievingPriceInformation.html
+ - https://docs.aws.amazon.com/AWSECommerceService/latest/DG/ReturningPrices.html
+ - https://developer.amazonservices.com/
+- monitor Amazon order status
+ - https://developer.amazonservices.com/gp/mws/api.html?group=orders§ion=orders
+- monitor eBay order status
+ - http://developer.ebay.com/DevZone/XML/docs/Reference/eBay/GetOrders.html
+- monitor eBay auctions (https://en.wikipedia.org/wiki/EBay_API)
+- monitor PayPal (https://www.programmableweb.com/api/paypal)
+- monitor bank account balance and transactions
+ - https://communities.usaa.com/t5/Banking/Banking-via-API-Root/m-p/180789/highlight/true#M50758
+ - https://plaid.com/
+ - https://plaid.com/docs/api/
+ - https://plaid.com/docs/api/#institution-overview
+ - https://github.com/plaid
+ - https://www.bignerdranch.com/blog/online-banking-apis/
+- monitor/log road/traffic conditions
+ - travel times for some route over a course of time
+ - https://msdn.microsoft.com/en-us/library/hh441725
+ - https://cloud.google.com/maps-platform/
+ - https://cloud.google.com/maps-platform/routes/
+ - https://developer.mapquest.com/documentation/traffic-api/
+ - https://developer.here.com/api-explorer/rest/traffic/traffic-flow-bounding-box
+- monitor news sources for patterns/substrings
+ - http://developer.nytimes.com/
+ - https://news.ycombinator.com/
+ - https://lobste.rs/
+ - https://www.undeadly.org/
+ - http://openbsdnow.org/
+ - https://lwn.net/
+- monitor a git repository
+ - General
+ - total branches
+ - age of last change per branch
+ - change set sizes
+ - GitHub
+ - pull requests
+ - issues
+- monitor CI
+ - Travis
+ - Jenkins
+- pull/push data from/to other monitoring systems (Nagios, Graphite, etc.)
+- monitor file/directory age (can be used for email and other messaging systems)
+- monitor mailboxes for particular patterns/substrings
+- monitor IRC server(s)/channel(s) for particular patterns/substrings (use `ii`)
+- monitor iptables log
+ - auto-(un)block upon some threshold of violations
+- monitor changes in an arbitrary web resource
+ - deletions
+ - insertions
+ - delta = insertions - deletions
+- monitor/log LAN/WAN configurations (address, router, subnet)
+- monitor/log geolocation based on WAN IP address
+- correlate iptables violations with network/geolocation
+- monitor vulnerability databases
+ - https://nvd.nist.gov/
+ - https://vuldb.com/
+ - http://cve.mitre.org/
+- vacation planning optimization
+ - I want to visit a set of places within some time period. Given the
+ current set of prices, a set of constraints (I need to stay some amount
+ of days at each, I must be in X at Y date, etc), which visiting dates for
+ each are cheapest?
+- browse https://www.programmableweb.com/ for some more ideas
+- GC trick: instead of actually doing GC, do a dummy run of building a status
+ bar at `BEGIN`, to fill-in the atimes for keys we need, then use the atimes
+ keys to build a regular expression to accept messages only from keys we
+ actually use
+
+Many of the above will undoubtedly need non-standard-system dependencies
+(languages, libraries, etc.), in which case - would they be better off as
+separate projects/repos?
+
+With all these ideas, it is starting to sound very noisy, but no worries - to
+quickly and temporarily shut everything up - just kill `dunst` and or toggle
+the status bar (`Alt` + `B` in `dwm`). For a permanent change - just don't
+turn-on the unwanted monitors/sensors.
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