Examples

See Arvados GoDoc for detailed documentation.

In these examples, the site prefix is aaaaa.

Initialize SDK

import (
  "git.curoverse.com/arvados.git/sdk/go/arvados"
  "git.curoverse.com/arvados.git/sdk/go/arvadosclient"
}

func main() {
  arv, err := arvadosclient.MakeArvadosClient()
  if err != nil {
    log.Fatalf("Error setting up arvados client %s", err.Error())
  }
}

create

  var collection arvados.Collection
  err := api.Create("collections", Dict{"collection": Dict{"name": "create example"}}, &collection)

delete

  var collection arvados.Collection
  err := api.Delete("collections", "aaaaa-4zz18-ccccccccccccccc", Dict{}, &collection)

get

  var collection arvados.Collection
  err := api.Get("collections", "aaaaa-4zz18-ccccccccccccccc", Dict{}, &collection)

list

  var collection arvados.Collection
  err := api.List("collections", Dict{}, &collection)

update

  var collection arvados.Collection
  err := api.Update("collections", "aaaaa-4zz18-ccccccccccccccc", Dict{"collection": Dict{"name": "update example"}}, &collection)

Get current user

  var user arvados.User
  err := api.Get("users", "current", Dict{}, &user)

Example program

You can save this source as a .go file and run it:

package main


// *******************
// Import the modules.
//
// Our examples don't use keepclient, but they do use fmt and log to
// display output.

import (
        "fmt"
        "git.curoverse.com/arvados.git/sdk/go/arvadosclient"
        "log"
)

func main() {


        // ********************************
        // Set up an API client user agent.
        //

        arv, err := arvadosclient.MakeArvadosClient()
        if err != nil {
                log.Fatalf("Error setting up arvados client %s", err.Error())
        }


        // *****************************************
        // Print the full name of the current user.
        //

        type user struct {
                // Remember to start each field name with a capital letter,
                // otherwise it won't get populated by the arvados client because
                // the field will be invisible to it.
                Uuid     string `json:"uuid"`
                FullName string `json:"full_name"`
        }

        var u user
        err = arv.Call("GET", "users", "", "current", nil, &u)

        if err != nil {
                log.Fatalf("error querying current user", err.Error())
        }

        log.Printf("Logged in as %s (uuid %s)", u.FullName, u.Uuid)


        // ********************************************************
        // Print all fields from the first five collections returned.
        //
        // Note that some fields, are not returned by default and have to be
        // requested. See below for an example.

        var results map[string]interface{}

        params := arvadosclient.Dict{"limit": 5}

        err = arv.List("collections", params, &results)
        if err != nil {
                log.Fatalf("error querying collections", err.Error())
        }

        printArvadosResults(results)


        // *********************************************************
        // Print some fields from the first two collections returned.
        //
        // We also print manifest_test, which has to be explicitly requested.
        //

        collection_fields_wanted := []string{"manifest_text", "owner_uuid", "uuid"}
        params = arvadosclient.Dict{"limit": 2, "select": collection_fields_wanted}

        err = arv.List("collections", params, &results)
        if err != nil {
                log.Fatalf("error querying collections", err.Error())
        }

        printArvadosResults(results)
}


// A helper method which will print out a result map returned by
// arvadosclient.
func printArvadosResults(results map[string]interface{}) {
        for key, value := range results {
                // "items", if it exists, holds a map.
                // So we print it prettily below.
                if key != "items" {
                        fmt.Println(key, ":", value)
                }
        }

        if value, ok := results["items"]; ok {
                items := value.([]interface{})
                for index, item := range items {
                        fmt.Println("===========  ", index, "  ===========")
                        item_map := item.(map[string]interface{})
                        if len(item_map) == 0 {
                                fmt.Println("item", index, ": empty map")
                        } else {
                                for k, v := range item_map {
                                        fmt.Println(index, k, ":", v)
                                }
                        }
                }
        }
}

A few more usage examples can be found in the services/keepproxy and sdk/go/keepclient directories in the arvados source tree.


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The content of this documentation is licensed under the Creative Commons Attribution-Share Alike 3.0 United States licence.
Code samples in this documentation are licensed under the Apache License, Version 2.0.