/
do_api.go
183 lines (147 loc) · 4.32 KB
/
do_api.go
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package main
import (
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
"time"
"github.com/parnurzeal/gorequest"
"github.com/ryanuber/go-filecache"
)
type digitalOceanAPI struct {
authToken string
droplets []Droplet
cache *filecache.Cache
}
func newApiFromConfig(config *Config) (*digitalOceanAPI, error) {
authToken, err := config.getAuthToken()
cacheFilePath, err := config.getDropletsCacheFileName()
cacheDuration := config.CacheDuration
if err != nil {
return nil, err
}
return newApi(authToken, cacheFilePath, cacheDuration), nil
}
func newApi(authToken, cacheFilePath string, cacheDuration int) *digitalOceanAPI {
api := &digitalOceanAPI{authToken: authToken}
api.cache = filecache.New(cacheFilePath, time.Duration(cacheDuration)*time.Minute, api.updateDropletsInfoCacheFile)
return api
}
func (api *digitalOceanAPI) forceUpdateCache() error {
return api.cache.Update()
}
func (api *digitalOceanAPI) loadDroplets(forceUpdate bool) error {
if forceUpdate {
if err := api.cache.Update(); err != nil {
return err
}
}
_, err := api.getDroplets()
return err
}
func (api *digitalOceanAPI) getDroplets() ([]Droplet, error) {
if api.droplets != nil {
return api.droplets, nil
}
// Also calls the update function if the file doesn't exist or is stale
fh, err := api.cache.Get()
if err != nil {
fmt.Printf("Unable to read cache file. Error: %s\n", err.Error())
return nil, err
}
api.droplets = getDropletsFromCacheFile(fh)
return api.droplets, nil
}
func (api *digitalOceanAPI) updateDropletsInfoCacheFile(filename string) error {
droplets := api.getDropletsFromApi()
if droplets == nil {
return errors.New("Unable to get droplets")
}
jsonStr, err := json.MarshalIndent(droplets, "", " ")
if err != nil {
fmt.Printf("Unable to convert DO Api response to JSON for caching. Error: %s\n", err.Error())
return err
}
cacheFile, err := os.Create(filename)
if err != nil {
fmt.Printf("Unable to create cache file. Error: %s\n", err.Error())
return err
}
_, err = cacheFile.Write(jsonStr)
if err != nil {
fmt.Printf("Error while writing cache file. Error: %s\n", err.Error())
return err
}
return nil
}
func (api *digitalOceanAPI) getDropletsFromApi() []Droplet {
req := gorequest.New()
resp, body, errs := req.Get("https://api.digitalocean.com/v2/droplets?page=1&per_page=1000").
Set("Content-Type", "application/json").
Set("Authorization", fmt.Sprintf("Bearer %s", api.authToken)).
EndBytes()
if len(errs) != 0 {
fmt.Println("Encountered errors while trying to get a list of droplets")
for _, err := range errs {
fmt.Println(err.Error())
}
return nil
}
if resp.StatusCode != http.StatusOK {
fmt.Printf("Expected 200, got %d as response status\n", resp.StatusCode)
return nil
}
apiResponse := &digitalOceanApiResponse{}
if err := json.Unmarshal(body, &apiResponse); err != nil {
fmt.Printf("Unable to decode json. Error: %s\n", err.Error())
return nil
}
return apiResponse.Droplets
}
func getDropletsFromCacheFile(fh *os.File) []Droplet {
fileBody, err := ioutil.ReadAll(fh)
if err != nil {
fmt.Printf("Unable to read from cache file. Error: %s\n", err.Error())
return nil
}
var droplets []Droplet
if err := json.Unmarshal(fileBody, &droplets); err != nil {
fmt.Printf("Unable to decode json. Error: %s\n", err.Error())
return nil
}
return droplets
}
func (api *digitalOceanAPI) getFilteredDroplets(filterExpressions []string) []Droplet {
dropletsInfo, err := api.getDroplets()
if err != nil {
fmt.Printf("Unable to get droplets. Error: %s\n", err.Error())
return nil
} else if len(dropletsInfo) == 0 {
fmt.Println("No droplets found in account")
return nil
}
// Convert all filter expression string to lower
for i := range filterExpressions {
filterExpressions[i] = strings.ToLower(filterExpressions[i])
}
matchedDroplets := make([]Droplet, 0)
for _, di := range dropletsInfo {
if di.matchesFilterExpressions(filterExpressions) {
matchedDroplets = append(matchedDroplets, di)
}
}
return matchedDroplets
}
func (api *digitalOceanAPI) getDropletByName(dropletName string) *Droplet {
inputDropletNameLower := strings.ToLower(dropletName)
for _, droplet := range api.droplets {
dropletNameLower := strings.ToLower(droplet.Name)
if inputDropletNameLower == dropletNameLower {
return &droplet
}
}
return nil
}