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airly.go
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airly.go
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package airly
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strconv"
"time"
)
var httpClient = &http.Client{
Timeout: 10 * time.Second,
}
// HTTPDoer is a single-method interface for performing HTTP requests.
type HTTPDoer interface {
Do(req *http.Request) (*http.Response, error)
}
// Client is a client for working with the Airly API.
type Client struct {
// HTTP client used to communicate with the API.
client HTTPDoer
apiKey string
baseURL *url.URL
language string
Installation *InstallationService
Measurement *MeasurementService
Meta *MetaService
}
// NewClient creates a Client that will use the specified access apiKey
// for its API requests.
func NewClient(client HTTPDoer, apiKey string) (*Client, error) {
if client == nil {
client = httpClient
}
if apiKey == "" {
return nil, errors.New("missing api key")
}
c := &Client{
client: client,
apiKey: apiKey,
baseURL: &url.URL{
Host: "airapi.airly.eu",
Scheme: "https",
Path: "/v2/",
},
}
c.Installation = &InstallationService{client: c}
c.Measurement = &MeasurementService{client: c}
c.Meta = &MetaService{client: c}
return c, nil
}
// Language is used to set a different language for textual content returned by Airly API.
// https://developer.airly.eu/docs#general.language
func (c *Client) Language(lang string) *Client {
c.language = lang
return c
}
// Violation represents an error that the requested value is invalid.
type Violation struct {
Parameter string `json:"parameter"`
Message string `json:"message"`
RejectedValue int64 `json:"rejectedValue"`
}
// Details represent a list of violations when interacting with the Airly API.
type Details struct {
Violations []Violation `json:"violations"`
}
// Error represents an error returned by the Airly API.
type Error struct {
ErrorCode string `json:"errorCode"`
Message string `json:"message"`
Details Details `json:"details"`
}
func (e Error) Error() string {
return e.Message
}
func (c *Client) decodeError(resp *http.Response) error {
var e Error
err := json.NewDecoder(resp.Body).Decode(&e)
if err != nil {
return fmt.Errorf("decode response: %w", err)
}
if e.Message == "" {
e.Message = fmt.Sprintf(
"airly: unexpected HTTP %d %s (empty error)",
resp.StatusCode,
http.StatusText(resp.StatusCode),
)
}
return e
}
type urlQuery struct {
opts url.Values
}
// NewURLQuery creates new query params builder.
func NewURLQuery() *urlQuery {
return &urlQuery{
opts: map[string][]string{},
}
}
func (q *urlQuery) setLocation(lat, lng float64) *urlQuery {
q.opts.Set("lat", fmt.Sprint(lat))
q.opts.Set("lng", fmt.Sprint(lng))
return q
}
func (q *urlQuery) setInstallationID(id int64) *urlQuery {
q.opts.Set("installationId", fmt.Sprint(id))
return q
}
func (q *urlQuery) setMaxDistance(km float64) *urlQuery {
q.opts.Set("maxDistanceKM", fmt.Sprint(km))
return q
}
func (q *urlQuery) setMaxResults(limit float64) *urlQuery {
q.opts.Set("maxResults", fmt.Sprint(limit))
return q
}
func (q *urlQuery) setIncludeWind(wind bool) *urlQuery {
q.opts.Set("includeWind", strconv.FormatBool(wind))
return q
}
func (q *urlQuery) setIndexType(index indexType) *urlQuery {
q.opts.Set("indexType", string(index))
return q
}
func (c *Client) get(path string, params url.Values, result interface{}) error {
u := c.baseURL.ResolveReference(
&url.URL{
Path: path,
RawQuery: params.Encode(),
},
)
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
return fmt.Errorf("http.NewRequest: %w", err)
}
req.Header.Add("apiKey", c.apiKey)
req.Header.Add("Accept", "application/json")
req.Header.Add("Content-Type", "application/json")
if c.language != "" {
req.Header.Add("Accept-Language", c.language)
}
resp, err := c.client.Do(req)
if err != nil {
return fmt.Errorf("doer.Do: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return c.decodeError(resp)
}
err = json.NewDecoder(resp.Body).Decode(result)
if err != nil {
return fmt.Errorf("decode response: %w", err)
}
return nil
}