dragonfax

asf

dragonfax

Whats a Context?

You can find this in a lot of frameworks for web dev nowdays and even a few UI frameworks. I feel its replacing something that some old languages had but modern ones don't. Dynamic scoping.

Think of it as a scope of data. Data that's scoped to the request. Every request might need a timeout, but it might not be a global hard-coded timeout. Different requests might require different timeouts. The headers are also request scoped data.

Dynamic Scope

We had this as a language feature back in perl. It was called "dynamic scoping" vs the "lexical scoping" we're all used to. Where you had global variables. But you could scope the value of a variable to a particular function call and its nested call tree.

dragonfax

Here is an example query and output. The `jq` command is just to format the JSON so its readable. 

17245-jstillwell:~ jstillwell$ curl -s https://api.travis-ci.com/repos?limit=100 -H "Authorization: token XXXXXXXXX" | jq '.' | head -30
[
  {
    "id": 302275,
    "slug": "zendesk/embeddable_framework",
    "description": "Home of the Embeddable Web Widget",
    "last_build_id": 72266014,
    "last_build_number": "9681",

dragonfax

package main

import (
	"fmt"
	"os"

	"github.com/therecipe/qt/core"
	"github.com/therecipe/qt/gui"
	"github.com/therecipe/qt/widgets"
)

dragonfax

Keybase proof

I hereby claim:

• I am dragonfax on github.
• I am dragonfax (https://keybase.io/dragonfax) on keybase.
• I have a public key whose fingerprint is E71B 4011 61B8 FDF2 7CA5 3828 F4C9 E0B5 00B1 1C51

To claim this, I am signing this object:

dragonfax

1. dd if=/dev/urandom of=test.file bs=1m count=100
2. go build
3. ./ test.file

This will have several goroutines try to read the file from the same file descriptor. And show that they all get only a random subset of the file.

dragonfax

The standard is for double quote (") to be encoded into " But golang seems to encode as the literal entity "

dragonfax

package main

import (
	"bytes"
	"fmt"
	"io/ioutil"

	"github.com/aws/aws-sdk-go/aws"
	"github.com/aws/aws-sdk-go/aws/credentials"
	"github.com/aws/aws-sdk-go/service/s3"

dragonfax

package main

import (
	"io/ioutil"
	"log"
	"net/http"
	"time"

	"github.com/smartystreets/go-aws-auth"
)

dragonfax

package main

import (
	"fmt"
	"log"

	"github.com/mitchellh/goamz/aws"
	"github.com/mitchellh/goamz/s3"
)