Import data from Google Cloud Storage, save locally, produce png, and save to Google Cloud Storage.

Julia-on-GCE-2

Pkg.add("Gadfly")
Pkg.add("HTTPClient")
Pkg.add("JSON")
Pkg.add("RDatasets")

using Gadfly
using HTTPClient.HTTPC
using JSON
using RDatasets


token_url = "http://metadata/computeMetadata/v1/instance/service-accounts/default/token"  
request = HTTPC.get(token_url, RequestOptions(headers=[("X-Google-Metadata-Request", "True")]))  
access_token = JSON.parse(bytestring(request.body))["access_token"]

bucket_name = <bucket_name> 
file_name = <data_file_name> 
project_number = <project_number> 
request_url = string("https://www.googleapis.com/storage/v1beta2/b/", bucket_name, "/o/", file_name, "?alt=media")  
request = HTTPC.get(request_url, RequestOptions(headers=[("Authorization", string("OAuth ", access_token)),  
                                                            ("x-goog-api-version", "2"),  
                                                            ("x-goog-project-id", project_number)]))

fp = open(file_name, "w")  
write(fp, takebuf_string(request.body))

wine_data = readtable(file_name) 

alcohol_vs_magnesium = plot(wine_data, x="Alcohol", y="Magnesium", Geom.point)  
png_name = "alcohol_vs_magnesium.png"  
draw(PNG(png_name, 6inch, 3inch),alcohol_vs_magnesium)

file_len = strip(readall(`stat -c %s $png_name`))  

request_url = string("https://www.googleapis.com/upload/storage/v1beta2/b/", bucket_name, "/o?uploadType=media&name=",png_name)  
options = RequestOptions(headers=[("Authorization", string("OAuth ", access_token)),("Content-Type","image/png"),("Content-Length", string(file_len))])  
request = HTTPC.post(request_url, (:file, png_name), options)  
println(request.http_code)
println("Check your bucket!")