buildpacks.go

package cfclient

import (
	"encoding/json"
	"io/ioutil"

	"github.com/pkg/errors"
)

type BuildpackResponse struct {
	Count     int                 `json:"total_results"`
	Pages     int                 `json:"total_pages"`
	NextUrl   string              `json:"next_url"`
	Resources []BuildpackResource `json:"resources"`
}

type BuildpackResource struct {
	Meta   Meta      `json:"metadata"`
	Entity Buildpack `json:"entity"`
}

type Buildpack struct {
	Guid     string `json:"guid"`
	Name     string `json:"name"`
	Enabled  bool   `json:"enabled"`
	Locked   bool   `json:"locked"`
	Filename string `json:"filename"`
	c        *Client
}

func (c *Client) ListBuildpacks() ([]Buildpack, error) {
	var buildpacks []Buildpack
	requestUrl := "/v2/buildpacks"
	for {
		buildpackResp, err := c.getBuildpackResponse(requestUrl)
		if err != nil {
			return []Buildpack{}, err
		}
		for _, buildpack := range buildpackResp.Resources {
			buildpack.Entity.Guid = buildpack.Meta.Guid
			buildpack.Entity.c = c
			buildpacks = append(buildpacks, buildpack.Entity)
		}
		requestUrl = buildpackResp.NextUrl
		if requestUrl == "" {
			break
		}
	}
	return buildpacks, nil
}

func (c *Client) getBuildpackResponse(requestUrl string) (BuildpackResponse, error) {
	var buildpackResp BuildpackResponse
	r := c.NewRequest("GET", requestUrl)
	resp, err := c.DoRequest(r)
	if err != nil {
		return BuildpackResponse{}, errors.Wrap(err, "Error requesting buildpacks")
	}
	resBody, err := ioutil.ReadAll(resp.Body)
	defer resp.Body.Close()
	if err != nil {
		return BuildpackResponse{}, errors.Wrap(err, "Error reading buildpack request")
	}
	err = json.Unmarshal(resBody, &buildpackResp)
	if err != nil {
		return BuildpackResponse{}, errors.Wrap(err, "Error unmarshalling buildpack")
	}
	return buildpackResp, nil
}