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client.go
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client.go
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package linodego
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"log"
"net/http"
"net/url"
"os"
"path"
"path/filepath"
"reflect"
"regexp"
"strconv"
"strings"
"sync"
"text/template"
"time"
"github.com/go-resty/resty/v2"
)
const (
// APIConfigEnvVar environment var to get path to Linode config
APIConfigEnvVar = "LINODE_CONFIG"
// APIConfigProfileEnvVar specifies the profile to use when loading from a Linode config
APIConfigProfileEnvVar = "LINODE_PROFILE"
// APIHost Linode API hostname
APIHost = "api.linode.com"
// APIHostVar environment var to check for alternate API URL
APIHostVar = "LINODE_URL"
// APIHostCert environment var containing path to CA cert to validate against.
// Note that the custom CA cannot be configured together with a custom HTTP Transport.
APIHostCert = "LINODE_CA"
// APIVersion Linode API version
APIVersion = "v4"
// APIVersionVar environment var to check for alternate API Version
APIVersionVar = "LINODE_API_VERSION"
// APIProto connect to API with http(s)
APIProto = "https"
// APIEnvVar environment var to check for API token
APIEnvVar = "LINODE_TOKEN"
// APISecondsPerPoll how frequently to poll for new Events or Status in WaitFor functions
APISecondsPerPoll = 3
// Maximum wait time for retries
APIRetryMaxWaitTime = time.Duration(30) * time.Second
APIDefaultCacheExpiration = time.Minute * 15
)
//nolint:unused
var (
reqLogTemplate = template.Must(template.New("request").Parse(`Sending request:
Method: {{.Method}}
URL: {{.URL}}
Headers: {{.Headers}}
Body: {{.Body}}`))
respLogTemplate = template.Must(template.New("response").Parse(`Received response:
Status: {{.Status}}
Headers: {{.Headers}}
Body: {{.Body}}`))
)
var envDebug = false
// Client is a wrapper around the Resty client
type Client struct {
resty *resty.Client
userAgent string
debug bool
retryConditionals []RetryConditional
pollInterval time.Duration
baseURL string
apiVersion string
apiProto string
selectedProfile string
loadedProfile string
configProfiles map[string]ConfigProfile
// Fields for caching endpoint responses
shouldCache bool
cacheExpiration time.Duration
cachedEntries map[string]clientCacheEntry
cachedEntryLock *sync.RWMutex
}
type EnvDefaults struct {
Token string
Profile string
}
type clientCacheEntry struct {
Created time.Time
Data any
// If != nil, use this instead of the
// global expiry
ExpiryOverride *time.Duration
}
type (
Request = resty.Request
Response = resty.Response
Logger = resty.Logger
)
func init() {
// Whether we will enable Resty debugging output
if apiDebug, ok := os.LookupEnv("LINODE_DEBUG"); ok {
if parsed, err := strconv.ParseBool(apiDebug); err == nil {
envDebug = parsed
log.Println("[INFO] LINODE_DEBUG being set to", envDebug)
} else {
log.Println("[WARN] LINODE_DEBUG should be an integer, 0 or 1")
}
}
}
// SetUserAgent sets a custom user-agent for HTTP requests
func (c *Client) SetUserAgent(ua string) *Client {
c.userAgent = ua
c.resty.SetHeader("User-Agent", c.userAgent)
return c
}
type RequestParams struct {
Body any
Response any
}
// Generic helper to execute HTTP requests using the net/http package
//
// nolint:unused, funlen, gocognit
func (c *httpClient) doRequest(ctx context.Context, method, url string, params RequestParams) error {
var (
req *http.Request
bodyBuffer *bytes.Buffer
resp *http.Response
err error
)
for range httpDefaultRetryCount {
req, bodyBuffer, err = c.createRequest(ctx, method, url, params)
if err != nil {
return err
}
if err = c.applyBeforeRequest(req); err != nil {
return err
}
if c.debug && c.logger != nil {
c.logRequest(req, method, url, bodyBuffer)
}
processResponse := func() error {
defer func() {
closeErr := resp.Body.Close()
if closeErr != nil && err == nil {
err = closeErr
}
}()
if err = c.checkHTTPError(resp); err != nil {
return err
}
if c.debug && c.logger != nil {
var logErr error
resp, logErr = c.logResponse(resp)
if logErr != nil {
return logErr
}
}
if params.Response != nil {
if err = c.decodeResponseBody(resp, params.Response); err != nil {
return err
}
}
// Apply after-response mutations
if err = c.applyAfterResponse(resp); err != nil {
return err
}
return nil
}
resp, err = c.sendRequest(req)
if err == nil {
if err = processResponse(); err == nil {
return nil
}
}
if !c.shouldRetry(resp, err) {
break
}
retryAfter, retryErr := c.retryAfter(resp)
if retryErr != nil {
return retryErr
}
// Sleep for the specified duration before retrying.
// If retryAfter is 0 (i.e., Retry-After header is not found),
// no delay is applied.
time.Sleep(retryAfter)
}
return err
}
// nolint:unused
func (c *httpClient) shouldRetry(resp *http.Response, err error) bool {
for _, retryConditional := range c.retryConditionals {
if retryConditional(resp, err) {
return true
}
}
return false
}
// nolint:unused
func (c *httpClient) createRequest(ctx context.Context, method, url string, params RequestParams) (*http.Request, *bytes.Buffer, error) {
var bodyReader io.Reader
var bodyBuffer *bytes.Buffer
if params.Body != nil {
bodyBuffer = new(bytes.Buffer)
if err := json.NewEncoder(bodyBuffer).Encode(params.Body); err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("failed to encode body: %v", err)
}
return nil, nil, fmt.Errorf("failed to encode body: %w", err)
}
bodyReader = bodyBuffer
}
req, err := http.NewRequestWithContext(ctx, method, url, bodyReader)
if err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("failed to create request: %v", err)
}
return nil, nil, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Accept", "application/json")
if c.userAgent != "" {
req.Header.Set("User-Agent", c.userAgent)
}
return req, bodyBuffer, nil
}
// nolint:unused
func (c *httpClient) applyBeforeRequest(req *http.Request) error {
for _, mutate := range c.onBeforeRequest {
if err := mutate(req); err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("failed to mutate before request: %v", err)
}
return fmt.Errorf("failed to mutate before request: %w", err)
}
}
return nil
}
// nolint:unused
func (c *httpClient) applyAfterResponse(resp *http.Response) error {
for _, mutate := range c.onAfterResponse {
if err := mutate(resp); err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("failed to mutate after response: %v", err)
}
return fmt.Errorf("failed to mutate after response: %w", err)
}
}
return nil
}
// nolint:unused
func (c *httpClient) logRequest(req *http.Request, method, url string, bodyBuffer *bytes.Buffer) {
var reqBody string
if bodyBuffer != nil {
reqBody = bodyBuffer.String()
} else {
reqBody = "nil"
}
var logBuf bytes.Buffer
err := reqLogTemplate.Execute(&logBuf, map[string]interface{}{
"Method": method,
"URL": url,
"Headers": req.Header,
"Body": reqBody,
})
if err == nil {
c.logger.Debugf(logBuf.String())
}
}
// nolint:unused
func (c *httpClient) sendRequest(req *http.Request) (*http.Response, error) {
resp, err := c.httpClient.Do(req)
if err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("failed to send request: %v", err)
}
return nil, fmt.Errorf("failed to send request: %w", err)
}
return resp, nil
}
// nolint:unused
func (c *httpClient) checkHTTPError(resp *http.Response) error {
_, err := coupleAPIErrorsHTTP(resp, nil)
if err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("received HTTP error: %v", err)
}
return err
}
return nil
}
// nolint:unused
func (c *httpClient) logResponse(resp *http.Response) (*http.Response, error) {
var respBody bytes.Buffer
if _, err := io.Copy(&respBody, resp.Body); err != nil {
c.logger.Errorf("failed to read response body: %v", err)
}
var logBuf bytes.Buffer
err := respLogTemplate.Execute(&logBuf, map[string]interface{}{
"Status": resp.Status,
"Headers": resp.Header,
"Body": respBody.String(),
})
if err == nil {
c.logger.Debugf(logBuf.String())
}
resp.Body = io.NopCloser(bytes.NewReader(respBody.Bytes()))
return resp, nil
}
// nolint:unused
func (c *httpClient) decodeResponseBody(resp *http.Response, response interface{}) error {
if err := json.NewDecoder(resp.Body).Decode(response); err != nil {
if c.debug && c.logger != nil {
c.logger.Errorf("failed to decode response: %v", err)
}
return fmt.Errorf("failed to decode response: %w", err)
}
return nil
}
// R wraps resty's R method
func (c *Client) R(ctx context.Context) *resty.Request {
return c.resty.R().
ExpectContentType("application/json").
SetHeader("Content-Type", "application/json").
SetContext(ctx).
SetError(APIError{})
}
// SetDebug sets the debug on resty's client
func (c *Client) SetDebug(debug bool) *Client {
c.debug = debug
c.resty.SetDebug(debug)
return c
}
// SetLogger allows the user to override the output
// logger for debug logs.
func (c *Client) SetLogger(logger Logger) *Client {
c.resty.SetLogger(logger)
return c
}
//nolint:unused
func (c *httpClient) httpSetDebug(debug bool) *httpClient {
c.debug = debug
return c
}
//nolint:unused
func (c *httpClient) httpSetLogger(logger httpLogger) *httpClient {
c.logger = logger
return c
}
// OnBeforeRequest adds a handler to the request body to run before the request is sent
func (c *Client) OnBeforeRequest(m func(request *Request) error) {
c.resty.OnBeforeRequest(func(_ *resty.Client, req *resty.Request) error {
return m(req)
})
}
// OnAfterResponse adds a handler to the request body to run before the request is sent
func (c *Client) OnAfterResponse(m func(response *Response) error) {
c.resty.OnAfterResponse(func(_ *resty.Client, req *resty.Response) error {
return m(req)
})
}
// nolint:unused
func (c *httpClient) httpOnBeforeRequest(m func(*http.Request) error) *httpClient {
c.onBeforeRequest = append(c.onBeforeRequest, m)
return c
}
// nolint:unused
func (c *httpClient) httpOnAfterResponse(m func(*http.Response) error) *httpClient {
c.onAfterResponse = append(c.onAfterResponse, m)
return c
}
// UseURL parses the individual components of the given API URL and configures the client
// accordingly. For example, a valid URL.
// For example:
//
// client.UseURL("https://api.test.linode.com/v4beta")
func (c *Client) UseURL(apiURL string) (*Client, error) {
parsedURL, err := url.Parse(apiURL)
if err != nil {
return nil, fmt.Errorf("failed to parse URL: %w", err)
}
// Create a new URL excluding the path to use as the base URL
baseURL := &url.URL{
Host: parsedURL.Host,
Scheme: parsedURL.Scheme,
}
c.SetBaseURL(baseURL.String())
versionMatches := regexp.MustCompile(`/v[a-zA-Z0-9]+`).FindAllString(parsedURL.Path, -1)
// Only set the version if a version is found in the URL, else use the default
if len(versionMatches) > 0 {
c.SetAPIVersion(
strings.Trim(versionMatches[len(versionMatches)-1], "/"),
)
}
return c, nil
}
// SetBaseURL sets the base URL of the Linode v4 API (https://api.linode.com/v4)
func (c *Client) SetBaseURL(baseURL string) *Client {
baseURLPath, _ := url.Parse(baseURL)
c.baseURL = path.Join(baseURLPath.Host, baseURLPath.Path)
c.apiProto = baseURLPath.Scheme
c.updateHostURL()
return c
}
// SetAPIVersion sets the version of the API to interface with
func (c *Client) SetAPIVersion(apiVersion string) *Client {
c.apiVersion = apiVersion
c.updateHostURL()
return c
}
func (c *Client) updateHostURL() {
apiProto := APIProto
baseURL := APIHost
apiVersion := APIVersion
if c.baseURL != "" {
baseURL = c.baseURL
}
if c.apiVersion != "" {
apiVersion = c.apiVersion
}
if c.apiProto != "" {
apiProto = c.apiProto
}
c.resty.SetBaseURL(
fmt.Sprintf(
"%s://%s/%s",
apiProto,
baseURL,
url.PathEscape(apiVersion),
),
)
}
// SetRootCertificate adds a root certificate to the underlying TLS client config
func (c *Client) SetRootCertificate(path string) *Client {
c.resty.SetRootCertificate(path)
return c
}
// SetToken sets the API token for all requests from this client
// Only necessary if you haven't already provided the http client to NewClient() configured with the token.
func (c *Client) SetToken(token string) *Client {
c.resty.SetHeader("Authorization", fmt.Sprintf("Bearer %s", token))
return c
}
// SetRetries adds retry conditions for "Linode Busy." errors and 429s.
func (c *Client) SetRetries() *Client {
c.
addRetryConditional(linodeBusyRetryCondition).
addRetryConditional(tooManyRequestsRetryCondition).
addRetryConditional(serviceUnavailableRetryCondition).
addRetryConditional(requestTimeoutRetryCondition).
addRetryConditional(requestGOAWAYRetryCondition).
addRetryConditional(requestNGINXRetryCondition).
SetRetryMaxWaitTime(APIRetryMaxWaitTime)
configureRetries(c)
return c
}
// AddRetryCondition adds a RetryConditional function to the Client
func (c *Client) AddRetryCondition(retryCondition RetryConditional) *Client {
c.resty.AddRetryCondition(resty.RetryConditionFunc(retryCondition))
return c
}
func (c *Client) addRetryConditional(retryConditional RetryConditional) *Client {
c.retryConditionals = append(c.retryConditionals, retryConditional)
return c
}
func (c *Client) addCachedResponse(endpoint string, response any, expiry *time.Duration) {
if !c.shouldCache {
return
}
responseValue := reflect.ValueOf(response)
entry := clientCacheEntry{
Created: time.Now(),
ExpiryOverride: expiry,
}
switch responseValue.Kind() {
case reflect.Ptr:
// We want to automatically deref pointers to
// avoid caching mutable data.
entry.Data = responseValue.Elem().Interface()
default:
entry.Data = response
}
c.cachedEntryLock.Lock()
defer c.cachedEntryLock.Unlock()
c.cachedEntries[endpoint] = entry
}
func (c *Client) getCachedResponse(endpoint string) any {
if !c.shouldCache {
return nil
}
c.cachedEntryLock.RLock()
// Hacky logic to dynamically RUnlock
// only if it is still locked by the
// end of the function.
// This is necessary as we take write
// access if the entry has expired.
rLocked := true
defer func() {
if rLocked {
c.cachedEntryLock.RUnlock()
}
}()
entry, ok := c.cachedEntries[endpoint]
if !ok {
return nil
}
// Handle expired entries
elapsedTime := time.Since(entry.Created)
hasExpired := elapsedTime > c.cacheExpiration
if entry.ExpiryOverride != nil {
hasExpired = elapsedTime > *entry.ExpiryOverride
}
if hasExpired {
// We need to give up our read access and request read-write access
c.cachedEntryLock.RUnlock()
rLocked = false
c.cachedEntryLock.Lock()
defer c.cachedEntryLock.Unlock()
delete(c.cachedEntries, endpoint)
return nil
}
return c.cachedEntries[endpoint].Data
}
// InvalidateCache clears all cached responses for all endpoints.
func (c *Client) InvalidateCache() {
c.cachedEntryLock.Lock()
defer c.cachedEntryLock.Unlock()
// GC will handle the old map
c.cachedEntries = make(map[string]clientCacheEntry)
}
// InvalidateCacheEndpoint invalidates a single cached endpoint.
func (c *Client) InvalidateCacheEndpoint(endpoint string) error {
u, err := url.Parse(endpoint)
if err != nil {
return fmt.Errorf("failed to parse URL for caching: %w", err)
}
c.cachedEntryLock.Lock()
defer c.cachedEntryLock.Unlock()
delete(c.cachedEntries, u.Path)
return nil
}
// SetGlobalCacheExpiration sets the desired time for any cached response
// to be valid for.
func (c *Client) SetGlobalCacheExpiration(expiryTime time.Duration) {
c.cacheExpiration = expiryTime
}
// UseCache sets whether response caching should be used
func (c *Client) UseCache(value bool) {
c.shouldCache = value
}
// SetRetryMaxWaitTime sets the maximum delay before retrying a request.
func (c *Client) SetRetryMaxWaitTime(maxWaitTime time.Duration) *Client {
c.resty.SetRetryMaxWaitTime(maxWaitTime)
return c
}
// SetRetryWaitTime sets the default (minimum) delay before retrying a request.
func (c *Client) SetRetryWaitTime(minWaitTime time.Duration) *Client {
c.resty.SetRetryWaitTime(minWaitTime)
return c
}
// SetRetryAfter sets the callback function to be invoked with a failed request
// to determine wben it should be retried.
func (c *Client) SetRetryAfter(callback RetryAfter) *Client {
c.resty.SetRetryAfter(resty.RetryAfterFunc(callback))
return c
}
// SetRetryCount sets the maximum retry attempts before aborting.
func (c *Client) SetRetryCount(count int) *Client {
c.resty.SetRetryCount(count)
return c
}
// SetPollDelay sets the number of milliseconds to wait between events or status polls.
// Affects all WaitFor* functions and retries.
func (c *Client) SetPollDelay(delay time.Duration) *Client {
c.pollInterval = delay
return c
}
// GetPollDelay gets the number of milliseconds to wait between events or status polls.
// Affects all WaitFor* functions and retries.
func (c *Client) GetPollDelay() time.Duration {
return c.pollInterval
}
// SetHeader sets a custom header to be used in all API requests made with the current
// client.
// NOTE: Some headers may be overridden by the individual request functions.
func (c *Client) SetHeader(name, value string) {
c.resty.SetHeader(name, value)
}
func (c *Client) enableLogSanitization() *Client {
c.resty.OnRequestLog(func(r *resty.RequestLog) error {
// masking authorization header
r.Header.Set("Authorization", "Bearer *******************************")
return nil
})
return c
}
// NewClient factory to create new Client struct
func NewClient(hc *http.Client) (client Client) {
if hc != nil {
client.resty = resty.NewWithClient(hc)
} else {
client.resty = resty.New()
}
client.shouldCache = true
client.cacheExpiration = APIDefaultCacheExpiration
client.cachedEntries = make(map[string]clientCacheEntry)
client.cachedEntryLock = &sync.RWMutex{}
client.SetUserAgent(DefaultUserAgent)
baseURL, baseURLExists := os.LookupEnv(APIHostVar)
if baseURLExists {
client.SetBaseURL(baseURL)
}
apiVersion, apiVersionExists := os.LookupEnv(APIVersionVar)
if apiVersionExists {
client.SetAPIVersion(apiVersion)
} else {
client.SetAPIVersion(APIVersion)
}
certPath, certPathExists := os.LookupEnv(APIHostCert)
if certPathExists && !hasCustomTransport(hc) {
cert, err := os.ReadFile(filepath.Clean(certPath))
if err != nil {
log.Fatalf("[ERROR] Error when reading cert at %s: %s\n", certPath, err.Error())
}
client.SetRootCertificate(certPath)
if envDebug {
log.Printf("[DEBUG] Set API root certificate to %s with contents %s\n", certPath, cert)
}
}
client.
SetRetryWaitTime(APISecondsPerPoll * time.Second).
SetPollDelay(APISecondsPerPoll * time.Second).
SetRetries().
SetDebug(envDebug).
enableLogSanitization()
return
}
// NewClientFromEnv creates a Client and initializes it with values
// from the LINODE_CONFIG file and the LINODE_TOKEN environment variable.
func NewClientFromEnv(hc *http.Client) (*Client, error) {
client := NewClient(hc)
// Users are expected to chain NewClient(...) and LoadConfig(...) to customize these options
configPath, err := resolveValidConfigPath()
if err != nil {
return nil, err
}
// Populate the token from the environment.
// Tokens should be first priority to maintain backwards compatibility
if token, ok := os.LookupEnv(APIEnvVar); ok && token != "" {
client.SetToken(token)
return &client, nil
}
if p, ok := os.LookupEnv(APIConfigEnvVar); ok {
configPath = p
} else if !ok && configPath == "" {
return nil, fmt.Errorf("no linode config file or token found")
}
configProfile := DefaultConfigProfile
if p, ok := os.LookupEnv(APIConfigProfileEnvVar); ok {
configProfile = p
}
client.selectedProfile = configProfile
// We should only load the config if the config file exists
if _, err = os.Stat(configPath); err != nil {
return nil, fmt.Errorf("error loading config file %s: %w", configPath, err)
}
err = client.preLoadConfig(configPath)
return &client, err
}
func (c *Client) preLoadConfig(configPath string) error {
if envDebug {
log.Printf("[INFO] Loading profile from %s\n", configPath)
}
if err := c.LoadConfig(&LoadConfigOptions{
Path: configPath,
SkipLoadProfile: true,
}); err != nil {
return err
}
// We don't want to load the profile until the user is actually making requests
c.OnBeforeRequest(func(_ *Request) error {
if c.loadedProfile != c.selectedProfile {
if err := c.UseProfile(c.selectedProfile); err != nil {
return err
}
}
return nil
})
return nil
}
func copyBool(bPtr *bool) *bool {
if bPtr == nil {
return nil
}
t := *bPtr
return &t
}
func copyInt(iPtr *int) *int {
if iPtr == nil {
return nil
}
t := *iPtr
return &t
}
func copyString(sPtr *string) *string {
if sPtr == nil {
return nil
}
t := *sPtr
return &t
}
func copyTime(tPtr *time.Time) *time.Time {
if tPtr == nil {
return nil
}
t := *tPtr
return &t
}
func generateListCacheURL(endpoint string, opts *ListOptions) (string, error) {
if opts == nil {
return endpoint, nil
}
hashedOpts, err := opts.Hash()
if err != nil {
return endpoint, err
}
return fmt.Sprintf("%s:%s", endpoint, hashedOpts), nil
}
func hasCustomTransport(hc *http.Client) bool {
if hc == nil {
return false
}
if hc.Transport != http.DefaultTransport.(*http.Transport) {
log.Println("[WARN] Custom transport is not allowed with a custom root CA.")
return true
}
return false
}