gostride

Go client library for Stride

Install

To begin using gostride within your Go code, install it with:

go get github.com/pipelinedb/gostride

Stride

To use gostride in your Go project, create a new instance of the Stride type, passing it your API key and a Config:

conf := NewConfig()
stride := NewStride("your_secret_key", conf)

Stride is a thin wrapper around Stride's HTTP API, so there are only a few main methods to use: Get, Post, Put, Delete, and Subscribe. All methods except for Subscribe return an instance of Response, which has three important members:

• StatusCode - The HTTP status code of the server's response
• Data - JSON-encoded interface{} containing response data
• Error - The error occurred during the request, if any

Get()

Get(path string)

• path - url to GET from

// Get a list of all streams
response := stride.Get("/collect")

streams := response.Data.([]interface{})

for _, s := range streams {
  fmt.Println(s)
}

Post()

Post(path string, data interface{})

• path - url to POST data to
• data - JSON-serialiable request body

// Create a simple MATERIALIZE process
response := stride.Post("/process/simple", map[string]interface{}{
  "query": "SELECT count(*) FROM some_stream",
  "action": "MATERIALIZE",
})

// Which returns the process we just created
proc := response.Data.(map[string]interface{})
fmt.Println(proc["name"])

Put()

Put(path string, data interface{})

• path - url to PUT data at
• data - JSON-serialiable request body

// Update one of our saved queries
stride.Put("/analyze/saved_query", map[string]interface{}{
  "query": "SELECT sum(value) FROM materialize_proc",
})

Delete()

Delete(path string)

• path - url to DELETE from

// Delete a saved query
stride.Delete("/analyze/saved_query")

Subscribe()

Subscribe(path string)

• path - url to subscribe to. Note that it is not necessary to append a /subscribe to the url.

Subscribe is slightly different from the other methods, because it doesn't map directly to a traditional HTTP request type. Subscribe opens a long-lived HTTP connection and continuously receives events from the server (see the API docs for more information about /subscribe endpoints).

Subscribe returns an instance of a Subscription, which must be explicitly started to begin receiving events. Once a Subscription is running, it will begin receiving events over its Events channel:

// Let's subscribe to a stream of changes made to one of our MATERIALIZE processes
subscription := stride.Subscribe("/process/simple")
subscription.Start()

// Since we're subscribed to a MATERIALIZE process, our events will contain old and new rows representing an incremental update
for event := range s.Events {
  fmt.Printf("count changed from %d to %d\n", event["old"]["count"], event["new"]["count"])
}

// Remember to clean up
subscription.Stop()

Remember to close your Subscription connections with Stop when you're done with them, otherwise they'll accumulate on the server and will eventually prevent you from opening new ones.

Collector

While you can certainly collect events by using the Post method, you may not always want a blocking call such as Post in your application. For asynchronous, non-blocking event collection, gostride also provides you with the Collector class to save you the hassle of writing async boilerplate around gostride's Post method.

config := &CollectorConfig{
  FlushInterval: 250 * time.Millisecond,
  BatchSize:     1000,
}
collector := NewCollector("your_secret_key", config)

for i := 0; i < 100000; i ++ {
  collector.Collect("stream_name", map[string]string{
    "key": "value",
    "i": i,
  })
}

collector.Close()