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Kailash Nadh knadh
knadh
/ unix-to-time.go
Created
July 1, 2022 07:36
Convert a unix (milli) timestamp to year, month, day ... without using the standard library
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| package main | |
| import ( | |
| "fmt" | |
| "time" | |
| ) | |
| func main() { | |
| fmt.Println(unixToTime(time.Now().UnixMilli())) | |
| } |
knadh
/ numbers-to-words.go
Created
June 12, 2022 08:22
Simple algorithm for converting numbers to English words (Golang)
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| package main | |
| import ( | |
| "fmt" | |
| ) | |
| var ( | |
| ones = []string{ | |
| "zero", "one", "two", "three", "four", | |
| "five", "six", "seven", "eight", "nine", |
knadh
/ parse-database-url-dsn-bash.sh
Created
August 21, 2021 06:26
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| #!/usr/bin/env bash | |
| DATABASE_URL="postgres://MyPostgresUser:MyPostgresPassword@192.168.0.1:5432/MyPostgresDB" | |
| # `cut` is used to cut out the separators (:, @, /) that come matched with the groups. | |
| DATABASE_USER=$(echo $DATABASE_URL | grep -oP "postgres://\K(.+?):" | cut -d: -f1) | |
| DATABASE_PASSWORD=$(echo $DATABASE_URL | grep -oP "postgres://.*:\K(.+?)@" | cut -d@ -f1) | |
| DATABASE_HOST=$(echo $DATABASE_URL | grep -oP "postgres://.*@\K(.+?):" | cut -d: -f1) | |
| DATABASE_PORT=$(echo $DATABASE_URL | grep -oP "postgres://.*@.*:\K(\d+)/" | cut -d/ -f1) |
knadh
/ flatten_test.go
Last active
June 9, 2021 10:52
Benchmark of flattening nested maps ({ "parent": { "child": 123 }}` -> `{ "parent.child": 123 }): Recursion vs. iteration
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| package main | |
| import ( | |
| "encoding/json" | |
| "strings" | |
| "testing" | |
| ) | |
| var nested map[string]interface{} |
knadh
/ go-redis-struct-scan.go
Last active
January 24, 2021 10:06
A Redis reply to struct scanner for go-redis/redis
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| package cacheman | |
| import ( | |
| "errors" | |
| "fmt" | |
| "reflect" | |
| "strconv" | |
| "strings" | |
| ) |
knadh
/ listmonk-upgrade-v0.7.0-alpha.sql
Created
July 26, 2020 15:06
Schema changes to upgrade to listmonk v0.7.0-alpha
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| ALTER TABLE media DROP COLUMN width, DROP COLUMN height; | |
| ALTER TABLE media ADD COLUMN provider TEXT NOT NULL; | |
| DROP TABLE IF EXISTS settings CASCADE; | |
| CREATE TABLE settings ( | |
| key TEXT NOT NULL UNIQUE, | |
| value JSONB NOT NULL DEFAULT '{}', | |
| updated_at TIMESTAMP WITH TIME ZONE DEFAULT NOW() | |
| ); | |
| DROP INDEX IF EXISTS idx_settings_key; CREATE INDEX idx_settings_key ON settings(key); | |
| INSERT INTO settings (key, value) VALUES |
knadh
/ go-graceful-reload.go
Last active
July 14, 2020 05:30
Example of gracefully shutting down and re-loading / restarting a Go app on SIGHUP retaining the same PID
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| // program | |
| package main | |
| import ( | |
| "fmt" | |
| "log" | |
| "os" | |
| "os/signal" | |
| "syscall" | |
| "time" |
knadh
/ kaf-kafka-connect-error.md
Created
February 20, 2020 06:37
Unable to get cluster admin: kafka: controller is not available
If you get this error and don't want to waste hours trying to debug why
kaf is unable to communicate with a Kafka cluster, make sure you have
an entry in the hosts file for the system's hostname that resolves to self (127.0.0.1),
if your cluster is running locally.
knadh
/ nats-cluster-multiple-publisher-failover.md
Created
March 21, 2019 08:02
Running multiple active publishers on a NATS cluster for failover avoding message duplication
NATS is an excellent, clustered, full-mesh PubSub messaging system, highly performant and a cakewalk to setup. Full mesh means every node (servers and clients) knows about every other node, which is great, but makes it tricky to have multiple publishers on hot standby, for high availability of publishers (not the NATS network), while avoiding duplicate pubs.
Here --no-advertise comes in handy if we're willing to sacrifice the automatic meshing and discovery mechanism. This may be acceptable in setups where only a fixed set of NATS servers run in a cluster and whose addresses (either IPs or hostnames) are known.
The gnatsd --no-advertise flag makes a NATS server not advertise itself automatically to the mesh. For other nodes to discover --no-advertise nodes, the --routes have to be explicitly specified. If there are N servers, there should be N routes.
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