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|
package flymachines
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"os"
)
const (
internalURL = "http://_api.internal:4280"
publicURL = "https://api.machines.dev"
)
type Error struct {
ErrorString string `json:"error"`
StatusCode int `json:"status_code"`
ReqID string `json:"req_id"`
Method string `json:"method"`
URL string `json:"url"`
}
func NewError(resp *http.Response) error {
body, err := io.ReadAll(io.LimitReader(resp.Body, 4096))
if err != nil {
return fmt.Errorf("flymachines: can't read response body while creating error: %w", err)
}
result := &Error{
StatusCode: resp.StatusCode,
ReqID: resp.Header.Get("Fly-Request-Id"),
Method: resp.Request.Method,
URL: resp.Request.URL.String(),
}
if err := json.Unmarshal(body, result); err != nil {
result.ErrorString = string(body)
}
return result
}
func (e *Error) Error() string {
return fmt.Sprintf("flymachines: %s %s (%d): %s", e.Method, e.URL, e.StatusCode, e.ErrorString)
}
func (e *Error) LogValue() slog.Value {
return slog.GroupValue(
slog.String("error", e.ErrorString),
slog.Int("status_code", e.StatusCode),
slog.String("req_id", e.ReqID),
slog.String("method", e.Method),
slog.String("url", e.URL),
)
}
type Client struct {
token, apiURL string
cli *http.Client
}
// NewClient returns a new client for the Fly machines API with the given API token and URL.
//
// This is a fairly low-level operation for if you know what URL you need, you probably want to use New instead.
func NewClient(token, apiURL string, cli *http.Client) *Client {
return &Client{token, apiURL, cli}
}
// New returns a new client for the Fly machines API with the given API token.
//
// This will automatically detect if you have access to the internal API either by a
// WireGuard tunnel or by being on the Fly network.
func New(token string, cli *http.Client) *Client {
resp, err := http.Get(internalURL)
if err != nil {
slog.Debug("can't reach internal API, falling back to public API", "err", err)
return NewClient(token, publicURL, cli)
}
if resp.StatusCode != http.StatusNotFound {
slog.Debug("can't reach internal API, falling back to public API", "status_code", resp.StatusCode)
return NewClient(token, publicURL, cli)
}
return NewClient(token, internalURL, cli)
}
// Do performs a HTTP request with the appropriate authentication and user agent headers.
func (c *Client) Do(req *http.Request) (*http.Response, error) {
req.Header.Set("Authorization", "Bearer "+c.token)
req.Header.Set("User-Agent", "within.website/x/web/fly/flymachines in "+os.Args[0])
return c.cli.Do(req)
}
func (c *Client) doRequestNoResponse(ctx context.Context, method, path string) error {
req, err := http.NewRequestWithContext(ctx, method, c.apiURL+path, nil)
if err != nil {
return err
}
resp, err := c.Do(req)
if err != nil {
return err
}
defer resp.Body.Close()
if resp.StatusCode/100 != 2 {
return NewError(resp)
}
return nil
}
// zilch returns the zero value of a given type.
func zilch[T any]() T { return *new(T) }
func doJSON[Output any](ctx context.Context, c *Client, method, path string, wantStatusCode int) (Output, error) {
req, err := http.NewRequestWithContext(ctx, method, c.apiURL+path, nil)
if err != nil {
return zilch[Output](), err
}
resp, err := c.Do(req)
if err != nil {
return zilch[Output](), err
}
defer resp.Body.Close()
if resp.StatusCode != wantStatusCode {
return zilch[Output](), NewError(resp)
}
var output Output
if err := json.NewDecoder(resp.Body).Decode(&output); err != nil {
return zilch[Output](), err
}
return output, nil
}
func doJSONBody[Input any, Output any](ctx context.Context, c *Client, method, path string, input Input, wantStatusCode int) (Output, error) {
buf := new(bytes.Buffer)
if err := json.NewEncoder(buf).Encode(input); err != nil {
return zilch[Output](), err
}
req, err := http.NewRequestWithContext(ctx, method, c.apiURL+path, buf)
if err != nil {
return zilch[Output](), err
}
resp, err := c.Do(req)
if err != nil {
return zilch[Output](), err
}
defer resp.Body.Close()
if resp.StatusCode != wantStatusCode {
return zilch[Output](), NewError(resp)
}
var output Output
if err := json.NewDecoder(resp.Body).Decode(&output); err != nil {
return zilch[Output](), err
}
return output, nil
}
|
