blacktip alternatives and similar packages
Based on the "Database" category.
Alternatively, view blacktip alternatives based on common mentions on social networks and blogs.
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erd
Translates a plain text description of a relational database schema to a graphical entity-relationship diagram. -
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HDBC-session
This repository includes a joined query generator based on typefull relational algebra, and mapping tools between SQL values list and Haskell record type. -
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groundhog
This library maps datatypes to a relational model, in a way similar to what ORM libraries do in OOP. See the tutorial https://www.schoolofhaskell.com/user/lykahb/groundhog for introduction -
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mysql-simple
A mid-level client library for the MySQL database, intended to be fast and easy to use. -
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dbmigrations
DISCONTINUED. A library for the creation, management, and installation of schema updates for relational databases. -
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ampersand
Build database applications faster than anyone else, and keep your data pollution free as a bonus. -
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hsparql
hsparql includes a DSL to easily create queries, as well as methods to submit those queries to a SPARQL server, returning the results as simple Haskell data structures.
InfluxDB - Purpose built for real-time analytics at any scale.
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README
Blacktip
[](blacktip.jpg "Blacktip Shark")
Blacktip is a k-ordered unique id service and a clone of Boundary's Flake.
Examples
import Database.Blacktip
wirelessConfig :: Config
wirelessConfig = defaultConfig { interface = IName "wlan0" }
main = do
result <- generateUniqueId wirelessConfig
case result of
Left NoInterfaceError -> error "fack"
Right uid -> putStrLn (show uid)
Benchmarks
Blacktip
[](bench.png "Benchmark results, Blacktip is faster than Flake")
Flake
([email protected])11> flake_harness:timed_generate(100000).
src/flake_harness.erl:33:<0.75.0>: generating ids: 0.272 s
Exceptional cases / Warnings
If you care about performance at all...
Don't pass the interface via the IName string. Fetch it yourself and put it in the config as an NIInterface.
I wrote getInterfaceByName for this purpose.
This is a singleton service, ONE INSTANCE PER SERVER/MAC ADDRESS
Do not embed this unless:
You don't care about globally unique identities (then why do you need this?)
You can guarantee there will be one instance of this running per server / MAC address.
System time
If system time flows backwards (this can happen), Database.Blacktip.Types.ArrowOfTimeError will be thrown.
This possibility could be eliminated by making an FFI wrapper for the monotonic system clock.
Sequence bounds checking
Currently there's no bounds checking on sequence. We start at 0 on a 16-bit signed integer. We're getting ~1500 uids per millisecond, we would need to exceed 32,767 (or 65,535 if we let negative numbers fly). We could flip it over to a Word16, which would at least eliminate the weirdness of negative sequence numbers but doesn't change anything at the bit level.
Possible solution would be to add bounds checking and yield. MVar has fairness and queue-like properties so this is a reasonable solution. For now, not a realistic possibility.
Timestamp file doesn't exist
Following the convention of existing implementations, we default the timestamp to 0 if there is no timestamp file at the location specified in the Database.Blacktip.Types.Config passed to generateUniqueId.
Timestamp file contains empty bits
Seems to be an artifact of something criterion (the benchmarks) does. Can't reproduce outside that, so defaulting timestamp to 0 when that happens.