DEV Community: Horst Gutmann

This post was originally published on my blog.

var zoneSources = []string{
    "/usr/share/zoneinfo/",
    "/usr/share/lib/zoneinfo/",
    "/usr/lib/locale/TZ/",
    runtime.GOROOT() + "/lib/time/zoneinfo.zip",
}

rsync://rsync.macports.org/macports/release/tarballs/ports.tar [default]

# Generate the private key
$ openssl genrsa -des3 -out privkey.pem 2048

# Derive the public key
$ openssl rsa -in privkey.pem -pubout -out pubkey.pem

# MacPorts system-wide public key configuration file.

/opt/local/share/macports/macports-pubkey.pem
/Users/zerok/src/github.com/zerok/macports-ports/pubkey.pem

$ exa -l --tree
drwxr-xr-x    - zerok  4 May 10:05 .
.rw-r--r--  562 zerok  4 May  9:59 ├── Makefile
.rw-r--r-- 1.8k zerok  4 May  9:32 ├── privkey.pem
.rw-r--r--  451 zerok  4 May  9:32 ├── pubkey.pem
.rw-r--r--  566 zerok  4 May 10:01 ├── pubkey.pem.sig
.rw-r--r--  316 zerok  4 May 10:01 ├── README.md
drwxr-xr-x    - zerok  4 May  9:26 └── sysutils
drwxr-xr-x    - zerok  4 May  9:26    └── exa
.rw-r--r-- 1.2k zerok  4 May  9:26       └── Portfile

all: dist/ports.tar.bz2 dist/ports.tar.bz2.rmd160

dist:
    mkdir -p dist

dist/ports.tar.bz2: dist
    mkdir dist/ports && \
    cp -R sysutils dist/ports/ && \
    cd dist && tar -cjvf ports.tar.bz2 ports && \
    rm -rf ports

dist/ports.tar.bz2.rmd160:
    openssl dgst -ripemd160 -sign privkey.pem -out dist/ports.tar.bz2.rmd160 dist/ports.tar.bz2.rmd160

clean:
    rm -rf dist

release:
    rsync -avz dist/* zerokspot.com:/srv/www/h10n.me/www/htdocs/macports-ports/ && \
    rsync -avz pubkey.* zerokspot.com:/srv/www/h10n.me/www/htdocs/macports-ports/

.PHONY: all clean release

https://h10n.me/macports-ports/ports.tar.bz2
rsync://rsync.macports.org/macports/release/tarballs/ports.tar [default]

# Download the sources:
$ sudo port sync

# Show the details of the new exa port:
$ port info exa
exa @0.8.0 (sysutils)

Description:          exa is a replacement for ls with additional features like color-coding for file types, Git integration, and extended attributes.
Homepage:             https://github.com/ogham/exa

Extract Dependencies: unzip
Platforms:            darwin
License:              MIT
Maintainers:          Email: zerok@macports.org

package server

import (
    "go.opencensus.io/stats"
    "go.opencensus.io/stats/view"
    "go.opencensus.io/tag"
)

var (
    loginFailedTotal     = stats.Int64("login_failed_total", "Total number of failed logins", "1")
    loginFailedTotalView = &view.View{
        Name:        "login_failed_total",
        Measure:     loginFailedTotal,
        Aggregation: view.Count(),
        TagKeys:     []tag.Key{},
    }
)

func init() {
    view.Register(loginFailedTotalView)
}

package server

import (
    "go.opencensus.io/stats"
)

func loginHandler(...) {
    // ...

    stats.Record(r.Context(), loginFailedTotal.M(1))

    // ...
}

package main

import (
    "contrib.go.opencensus.io/exporter/prometheus"
    "go.opencensus.io/stats/view"
)

func main() {
    // ...

    promex, _ := prometheus.NewExporter(prometheus.Options{Namespace: "myapp"})
    view.RegisterExporter(promex)

    mux.Handle("/metrics", promex)

    // ...
}

# HELP myapp_login_failed_total Total number of failed logins
# TYPE myapp_login_failed_total counter
myapp_login_failed_total 1

import (
    "net/http"

    "contrib.go.opencensus.io/exporter/jaeger"
    "go.opencensus.io/trace"
)

func main() {
    // ...

    trace.ApplyConfig(trace.Config{
        DefaultSampler: trace.AlwaysSample(),
    })
    agentEndpointURI := "localhost:6831"
    collectorEndpointURI := "http://localhost:14268/api/traces"
    jex, _ := jaeger.NewExporter(jaeger.Options{
        AgentEndpoint:     agentEndpointURI,
        CollectorEndpoint: collectorEndpointURI,
        ServiceName:       "myapp",
    })
    trace.RegisterExporter(jex)

    // ...
}

func loginHandler(w http.ResponseWriter, r *http.Request) {
    ctx := r.Context()
    ctx, span := trace.StartSpan(ctx, "failed-login")
    span.AddAttributes(trace.StringAttribute("user", "some-user"))
    defer span.End()

    // ...
}

DEV Community: Horst Gutmann

Timezone data in Go

Custom repositories in MacPorts

Signed archives

A new source

The good and the not so good

Getting started with OpenCensus

Tracking metrics

Traces

Closing thoughts

Complete example