圖片管理系統：Grid_the_Guardian

Grid 是英國《衛報》（the Guardian）的圖片管理系統，它提供了一種通用和快速的體驗來訪問已被整理好的媒體，并以很經濟的方法來生產高質量的內容。

Grid 的運行類似于一組獨立的微服務(Scala andPlay Framework) 公開超媒體 APIs (argo)，使用豐富的 Web 用戶界面（AngularJS）進行訪問。

Grid 依賴于 Elasticsearch 的高速搜索，以 AWS 服務作為附加的存儲和通信機制。

Grid 的架構圖：

Running the applications

Requirements

You will need to install:

• sbt
• JDK 8
• Nginx
• GraphicsMagick or ImageMagick (we use GraphicsMagick on the servers).sudo apt-get install graphicsorbrew install imagemagick.

Nginx

To run correctly in standalone mode we run behind nginx, this can be installed as follows:

1. Install nginx:

   • Linux: sudo apt-get install nginx
   • Mac OSX: brew install nginx

2. Make sure you have a sites-enabled folder under your nginx home. This should be

   • Linux: /etc/nginx/sites-enabled
   • Mac OSX: /usr/local/etc/nginx/

3. Make sure your nginx.conf (found in your nginx home) contains the following line in the http{} block:include sites-enabled/*;

   • you may also want to disable the default server on 8080

4. Get the dev-nginx repo checked out on your machine

5. Set up certs if you've not already done so

6. Configure the app routes in nginx

   sudo /setup-app.rb /nginx-mapping.yml

Elasticsearch

You can runsetup.shto install and start Elasticsearch. You can use the script to start up Elasticsearch even if it's already installed.

Alternatively you can do these steps manually:

Run the Elasticsearch installer from theelasticsearchdirectory:

$ cd elasticsearch/
    $ ./dev-install.sh

Start Elasticsearch from theelasticsearchdirectory:

$ cd elasticsearch/
    $ ./dev-start.sh

Create CloudFormation Stack

First you need to create some dev credentials and resources in AWS.

Log into the AWS Console (ask your friendly system administrator for a link and credentials) and change to the EU (Ireland) availability zone.

Go to the CloudFormation console and add a new stack, call itmedia-service-DEV-{your-username}, upload the template file fromcloud-formation/dev-template.jsonand create the stack.

.properties files

Generate your .properties files for the various media-service services using the dot-properties generator

This will also create apanda.propertiesfile that configures the pan-domain authentication

This file will be used by the different applications to share auth config, so that CORS is enabled across APIs.

Make sure you put the generated.propertiesfiles in/etc/gu/instead of~/.gu/as many apps do.

Run Media API

From the project root, run via sbt:

$ sbt
    > project media-api
    > run

You may pass an argument torunto define which port to attach to, e.g.:

> run 9001

The media api should be up at http://localhost:9001/.

Run Thrall

From the project root, run via sbt:

$ sbt
    > project thrall
    > run 9002

The thrall should be up at http://localhost:9002/.

Run the Image Loader

From the project root, run via sbt:

$ sbt
    > project image-loader
    > run 9003

The image loader should be up at http://localhost:9003/.

You can upload a test image to it usingcurl:

curl -X POST --data-binary @integration/src/test/resources/images/honeybee.jpg http://localhost:9003/images

It should then appear in the Media API at http://localhost:9001/images.

Run the FTP Watcher

From the project root, run via sbt:

$ sbt -Dftp.active=true
    > project ftp-watcher
    > run 9004

The FTP watcher should be up at http://localhost:9004/.

Images should appear in the Media API at http://localhost:9001/images.

Run Kahuna

Run thesetup.shscript from the kahuna directory to get started:

$ cd kahuna
    $ ./setup.sh

Then, from the project root, run via sbt:

$ sbt
    > project kahuna
    > run 9005

The user interface should be up at http://localhost:9005/.

Run Cropper

Add an API key for cropper to your key bucket:

# Create key file
$ CROPPER_KEY=cropper-`head -c 1024 /dev/urandom | md5sum | awk '{ print $1 }'`
$ echo Cropper > $CROPPER_KEY

# Upload to S3
# note: see `aws --profile media s3 ls | grep keybucket` output to find your bucket name
$ aws s3 cp $CROPPER_KEY s3://...YOUR_BUCKET_NAME.../

From the project root, run via sbt:

$ sbt
    > project cropper
    > run 9006

The user interface should be up at http://localhost:9006/.

Run Metadata Editor

From the project root, run via sbt:

$ sbt
    > project metadata-editor
    > run 9007

The user interface should be up at http://localhost:9007/.

Run ImgOps

Troubleshooting

Nginx returns "413 Request Entity Too Large"

Make sure you bump the maximum allowed body size in your nginx config (defaults to 1MB):

client_max_body_size 20m;

Crops fail with a 500 HTTP error and an SSL error in the cropper logs

Make sure you install any certificate authority file needed in the Java runtime for the cropper service to talk to the media-api.

You can do so with thekeytoolcommand:

$ sudo keytool -import \
               -trustcacerts \
               -alias internalrootca \
               -file rootcafile.cer \
               -keystore /path/to/global/jre/lib/security/cacerts

whereinternalrootcais the name you want to give the certificate in your keystore,rootcafile.ceris the certificate file you want to install, and/path/to/global/jre/lib/security/cacertsthe location of thecacertsfile for the JRE you're using.

On Mac OS X, it may be something like/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/security/cacerts; on GNU Linux, it may be something like/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/security/cacerts.

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