#Abstract
True Air Speed aka Tree Avoidance System, a lightweight system to track and analyze real-time data.
#Prerequisites
-
Go 1.2.2 package must be installed on your computer.
-
zmq2 package must also be installed.
#Usage TAS is useful if you are looking for code that can store information in a tree and automatically deletes the expired information.
Some applications of TAS include
- storing the users’ shopping history
- real-time display of stock market trends
- displaying live tweets
#Getting Started
###Installation
- Download the Go 1.2.2 package:http://golang.org/dl/
Note: TAS hasn’t been tested on Go 1.3.
Install the zmq2 library from github:
go get github/com/pebbe/zmq2
- Download the TAS package, run:
hg clone ssh://hg@bitbucket.org/chango/atc
cd atc/tas
###Example
The server has to be up and running first. For UNIX-like systems, type the following commands in terminal:
cd tas
go run tas.go
Create a file called hellotas.go and paste the following code:
package main
import (
"fmt"
zmq "github.com/pebbe/zmq2"
"time"
"net/http"
"io/ioutil"
"encoding/json"
"strconv"
)
const http_port = 7451
const tcp_port = 7450
func main() {
// Socket connection setup
socket, _ := zmq.NewSocket(zmq.PUSH)
socket.Connect("tcp://localhost:"+strconv.Itoa(tcp_port))
defer socket.Close()
// Inserting "Hello World" to the tree with key root.level1.level2
now := time.Now().Unix()
timestamp := strconv.FormatInt(now, 10)
key := "root.level1.level2"
value := []string{"Hello World"}
value_js, _ := json.Marshal(value)
msg := fmt.Sprintf("APPEND %s %s %s", timestamp, key, value_js)
socket.SendBytes([]byte(msg), 0)
fmt.Printf("Sending %s...\n", msg)
// Wait a few milliseconds for the server to update the tree
time.Sleep(2*time.Millisecond)
// Check the result from the http://localhost:7451/GET page
link := "http://localhost:"+strconv.Itoa(http_port)+"/GET?key=*.*.*"
resp, _ := http.Get(link)
defer resp.Body.Close()
// Read and return the output of HTTP GET
contents, _ := ioutil.ReadAll(resp.Body)
data := make(map[string]interface{})
json.Unmarshal(contents, &data)
// Print the output to terminal
fmt.Println(data)
}On a separate terminal, run hellotas.go by changing directory to where you stored hellotas.go. Then run the code by typing the command:
go run hellotas.go
#Documentation The documentation can be found here.