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Examples

As an example we have created a golang application that you can use to experiment with the DynamoDB adapter. The sample application uses the ecommerce data in the sample-data directory. Using those scripts you will create tables in DynamoDB, once that is done follow these instructions to migrate the data, setup the adapter and then run the sample application.

Create sample data

To create the sample data follow the instructions in the sample-data README.

Create target Cloud Spanner instance

Now you will create a Cloud Spanner instance to migrate the data into

gcloud config set project [your project id]
gcloud spanner instances create dynamodb-migration --config=regional-us-central1 --nodes=1

Mirgrate the data

For the data migration we'll use Harbourbridge. Follow the installation instructions to get Harbourbridge installed. Harbourbridge will analyze the data to determine the schema and then also copy the data across to Cloud Spanner.

Export your AWS credentials:

export AWS_REGION=[your region]
export AWS_ACCESS_KEY_ID=[your access key id]
export AWS_SECRET_ACCESS_KEY=[your secret key]
export AWS_SESSION_TOKEN=[if using multi-factor authentication]

Migrate the data:

harbourbridge -driver=dynamodb -instance=dynamodb-migration -dbname=ecommerce

Create the indexes:

CREATE INDEX By_customer
  ON Customer_Order (customer_id, order_ts ASC);

CREATE INDEX By_Product_Category
  ON Product (product_category, product_id ASC);

Initialize the adapter configuration

The DynamoDB adapter uses tables in Cloud Spanner to store some configuration data. adapter/init.go is a helper tool that will create those tables and populate them using the schema that was just created by Harbourbridge. adapter/init.go also uses the sample configuration files stored in adapter/config-files/staging contains examples of the config-files needed for the ecommerce sample.

Set your project id in the sample configuration files:

cd examples
sed -i "s/YOUR_PROJECT_HERE/[your project id]/g" adapter/config-files/staging/config.json

Initialize the adapter's configuration tables:

cd adapter
go run init.go setup
cd ..

Build the adapter

cd ..
Replace config-files with config-files under example dir

sed -i 's#rice\.MustFindBox("config-files")#rice\.MustFindBox("examples/adapter/config-files")'#g main.go

go build
cp dyanmodb-adapter examples/adpater/

Start the adapter

cd examples/adapter
./dynamodb-adapter

Should see output similar to:

2021-09-14T23:16:45.994-0600  DEBUG logger/logger.go:66 [Fetching starts]
[GIN-debug] [WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.

[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
 - using env: export GIN_MODE=release
 - using code:  gin.SetMode(gin.ReleaseMode)

[GIN-debug] GET    /debug/pprof/             --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/cmdline      --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/profile      --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] POST   /debug/pprof/symbol       --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/symbol       --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/trace        --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/allocs       --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/block        --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/goroutine    --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/heap         --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/mutex        --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /debug/pprof/threadcreate --> github.com/gin-contrib/pprof.pprofHandler.func1 (3 handlers)
[GIN-debug] GET    /doc/*any                 --> github.com/swaggo/gin-swagger.CustomWrapHandler.func1 (3 handlers)
[GIN-debug] GET    /                         --> main.main.func1 (3 handlers)
[GIN-debug] POST   /v1                       --> github.com/cloudspannerecosystem/dynamodb-adapter/api/v1.RouteRequest (3 handlers)
[GIN-debug] Listening and serving HTTP on :9050

Run the sample application

The sample application can run queries directly against DynamoDB using dynamo argument or run queries against Cloud Spanner using the spanner argument.

Query the ecommerce data using the DynamoDB adapter:

cd golang
go build
./golang spanner