Dynago

Dynago is a DynamoDB client API for Go.

This attempts to be a really simple, principle of least-surprise client for the DynamoDB API.

Key design tenets of Dynago:

• Most actions are done via chaining to build filters and conditions
• all objects are completely safe for passing between goroutines (even queries and the like)
• To make understanding easier via docs, we use amazon's naming wherever possible.

Installation

Install using go get:

go get github.com/underarmour/dynago

Docs are at http://godoc.org/github.com/underarmour/dynago

Example

Run a query:

client := dynago.NewClient(endpoint, accessKey, secretKey)

query := client.Query(table).
	KeyConditionExpression("UserId = :uid", dynago.Param{":uid", 42}).
	FilterExpression("NumViews > :views").
	Param(":views", 50).
	Desc()

result, err := query.Execute()
if err != nil {
	// do something
}
for _, row := range result.Items {
	fmt.Printf("Name: %s, Views: %d", row["Name"], row["NumViews"])
}

Type Marshaling

Dynago attempts to let you use go types instead of having to understand a whole lot about dynamo's internal type system.

Example:

doc := dynago.Document{
	"name": "Bob",
	"age": 45,
	"height": 2.1,
	"address": dynago.Document{
		"city": "Boston",
	},
	"tags": dynago.StringSet{"male", "middle_aged"},
}
client.PutItem("person", doc).Execute()

• Strings use golang string
• Numbers can be input as int or float64 but always are returned as dynago.Number to not lose precision.
• Maps can be either map[string]interface{} or dynago.Document
• Opaque binary data can be put in []byte
• String sets, number sets, binary sets are supported using dynago.StringSet dynago.NumberSet dynago.BinarySet
• Lists are supported using dynago.List