scalings.go

// Copyright 2016 Compose, an IBM Company
//
// 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.

package composeapi

import (
	"encoding/json"
)

// Scalings represents the used, allocated, starting and minimum unit scale
// of a deployment
type Scalings struct {
	AllocatedUnits int    `json:"allocated_units"`
	UsedUnits      int    `json:"used_units"`
	StartingUnits  int    `json:"starting_units"`
	MinimumUnits   int    `json:"minimum_units"`
	UnitSizeInMB   int    `json:"unit_size_in_mb"`
	UnitType       string `json:"unit_type"`
}

//ScalingsParams represents the parameters needed to scale a deployment
type ScalingsParams struct {
	DeploymentID string
	Units        int
}

type scalingsParams struct {
	DeploymentID string               `json:"-"`
	Deployment   scalingSettingParams `json:"deployment"`
}

type scalingSettingParams struct {
	Units int `json:"units"`
}

//GetScalingsJSON returns raw scalings
func (c *Client) GetScalingsJSON(deploymentid string) (string, []error) {
	return c.getJSON("deployments/" + deploymentid + "/scalings")
}

//GetScalings returns deployment structure
func (c *Client) GetScalings(deploymentid string) (*Scalings, []error) {
	body, errs := c.GetScalingsJSON(deploymentid)

	if errs != nil {
		return nil, errs
	}

	scalings := Scalings{}
	json.Unmarshal([]byte(body), &scalings)

	return &scalings, nil
}

//SetScalingsJSON sets JSON scaling and returns string respones
func (c *Client) SetScalingsJSON(params ScalingsParams) (string, []error) {
	scalingsparams := scalingsParams{DeploymentID: params.DeploymentID,
		Deployment: scalingSettingParams{Units: params.Units},
	}

	response, body, errs := c.newRequest("POST", apibase+"deployments/"+params.DeploymentID+"/scalings").
		Send(scalingsparams).
		End()

	if response.StatusCode != 200 { // Expect Accepted on success - assume error on anything else
		errs = ProcessErrors(response.StatusCode, body)
	}

	return body, errs
}

//SetScalings sets scale and returns recipe for scaling
func (c *Client) SetScalings(scalingsParams ScalingsParams) (*Recipe, []error) {
	body, errs := c.SetScalingsJSON(scalingsParams)
	if errs != nil {
		return nil, errs
	}

	recipe := Recipe{}
	json.Unmarshal([]byte(body), &recipe)

	return &recipe, nil
}