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go-collins

go-collins is a client library for Collins (our inventory management database) written in Go. It covers the full API and allows you to manage your assets and their data from Go applications. It is very much influenced by the beautiful go-github project.

Usage

We use semantic versioning to indicate what the scope of changes between versions are. You can use this to ensure breaking changes aren't introduced in to your application by using gopkg.in to get the package, and specify the major version there.

import "gopkg.in/tumblr/go-collins.v0/collins"

The current gopkg version is v0, which means that the package is of alpha or beta quality. While we do actively use go-collins at Tumblr and will try to maintain a stable interface, for now consider this a work-in-progress in that breaking changes may be made.

To start querying collins, import go-collins and set up a new Client by using NewClient() or NewClientFromYaml(). The second function will look for a collins.yml file and use credentials from it, while NewClient() takes credentials as parameters.

import (
	"fmt"

	"gopkg.in/tumblr/go-collins.v0/collins"
)

func main() {
	client, err := collins.NewClient("username", "password", "https://collins.example.com")
	if err != nil {
		fmt.Errorf("Could not set up collins client: %s", err)
	}
	// Use client to interact with collins
}

In the client struct, there are pointers to services that can be used to talk to specific parts of the API. The most common use (at least at Tumblr) is talking to the asset API for things like getting the number of physical CPUs in an asset:

asset, _, err := client.Assets.Get("assettag1")
if err != nil {
	fmt.Errorf("Assets.Get returned error: %s", err)
}
fmt.Printf("CPUs: %d\n", len(asset.Hardware.CPUs))

Or finding assets that match certain criteria:

opts := collins.AssetFindOpts{
	Status: "Unallocated",
}

assets, _, err := client.Assets.Find(&opts)
if err != nil {
	fmt.Errorf("Assets.Find returned error: %s", err)
}

fmt.Printf("First unallocated tag: %s\n", assets[0].Metadata.Tag)

Pagination

Some routes in the API (finding assets and fetching logs) are paginated. To support pagination we include pagination information in the Request struct returned by the functions. The members are PreviousPage, CurrentPage, NextPage and TotalResults. These together with the PageOpts struct can be used to navigate through the pages.

opts := collins.AssetFindOpts{
	Status: "Unallocated",
	PageOpts: collins.PageOpts{Page: 0}
}

for {
	assets, resp, err := client.Assets.Find(&opts)
	if err != nil {
		fmt.Errorf("Assets.Find returned error: %s", err)
	}

	for _, asset := range assets {
		fmt.Printf("Tag: %s\n", asset.Tag)
	}

	if resp.NextPage == resp.CurrentPage { // No more pages
		break
	} else { // Fetch next page
		opts.PageOpts.Page++
	}
}

Contributing

Bug reports and patches are very welcome. Before contributing code, please see CONTRIBUTING.md.

Contributors

• Felix Aronsson (defect)
• Matt Schallert (schallert)
• Sashi Guntury (sushruta)
• Will Richard (Primer42)

Licence

Copyright 2016 Tumblr Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.