Golang: testing http and grpc servers
HTTP server is quite easy to test — here is a nice video about it:
Count lines in git repository
git ls-files | xargs wc -l https://stackoverflow.com/questions/4822471/count-number-of-lines-in-a-git-repository
Algorithms to find fastest route through network
This is a great article on that — https://www.redblobgames.com/pathfinding/a-star/introduction.html (in russain). It tells about Dijkstra, Breadth-first, Greedy and A* algorithms. It’s all about optimization of one travel. To optimize your entire network you should try to use Aint Colony algorithm — http://rain.ifmo.ru/cat/data/theory/unsorted/ant-algo-2006/article.pdf (it’s in russian). Another link to this PDF file — aca
How go code is being compiled to assembler code
https://go.godbolt.org/z/31FyJ3 I was interested in comparing line 15 vs line 17 of the following code: package main import «fmt» type kv struct { key []byte value []byte } type sliceMap []kv func (sm *sliceMap) Add(k, v []byte) { kvs := *sm if cap(kvs) > len(kvs) { kvs = kvs[:len(kvs)+1] } else { kvs = append(kvs, …
E2E tests in go
I tried it via ginkgo and gomega. It has Agouti with WebDriver support out of the box, but I didn’t use it as we have grpc API. That’s the example (table tests): var _ = Describe(«GetRoute», func() { var ( srClient sr.Client srErr error ) JustBeforeEach(func() { srClient, srErr = GetClient() }) DescribeTable(«positive cases», func(fromGeoPointID, …
What is teamlead’s first duty
Sarah Mei «We think awful code is written by awful devs. But in reality, it’s written by reasonable devs in awful circumstances.» (source) So, teamlead is there to improve circumstances.
ORM for go
https://github.com/Masterminds/squirrel Never used it as we always write SQL queries manually. But looks okay for ORM (well, actually a query-builder).
Kubernetes’ cronjobs
That’s what it is — https://kubernetes.io/docs/concepts/workloads/controllers/cron-jobs/ Get all cronjobs in env: kubectl —kubeconfig … —namespace platform -o wide get cronjobs Get info on exact cronjob: kubectl —kubeconfig … —namespace platform describe cronjob/smartrouting-cron-import-from-bi Get pods with this cronjob: kubectl —kubeconfig … —namespace platform -o wide get pods|grep «rou» Get logs of cronjob kubectl —kubeconfig … —namespace …
Crontab time format
That’s about it: min hour day/month month day/week Execution time 30 0 1 1,6,12 * — 00:30 Hrs on 1st of Jan, June & Dec. 0 20 * 10 1-5 –8.00 PM every weekday (Mon-Fri) only in Oct. 0 0 1,10,15 * * — midnight on 1st ,10th & 15th of month 5,10 0 10 …
How to make grpc call from shell
1 https://github.com/grpc/grpc/blob/master/doc/command_line_tool.md grpc_cli call localhost:7020 ChatAPI.GetChats «external_user:{id:’30594028′,type:1}, limit:10, offset:0, order:ORDER_DESC, requested_by_external_user:{id:’30594028′,type:1},with_unread_count:true» 2 https://github.com/fullstorydev/grpcurl grpcurl -plaintext -emit-defaults -d ‘{«lozon_id»: 15515160432000}’ -H ‘User-Name: grpcurl’ localhost:7020 points/FindPointByLozonID