+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: Apache-2.0
+
/* Simple Arvados Go SDK for communicating with API server. */
package arvadosclient
import (
"bytes"
"crypto/tls"
+ "crypto/x509"
"encoding/json"
"errors"
"fmt"
"io"
+ "io/ioutil"
+ "log"
"net/http"
"net/url"
"os"
- "regexp"
"strings"
+ "sync"
"time"
+
+ "git.arvados.org/arvados.git/sdk/go/arvados"
)
type StringMatcher func(string) bool
-var UUIDMatch StringMatcher = regexp.MustCompile(`^[a-z0-9]{5}-[a-z0-9]{5}-[a-z0-9]{15}$`).MatchString
-var PDHMatch StringMatcher = regexp.MustCompile(`^[0-9a-f]{32}\+\d+$`).MatchString
+var UUIDMatch StringMatcher = arvados.UUIDMatch
+var PDHMatch StringMatcher = arvados.PDHMatch
var MissingArvadosApiHost = errors.New("Missing required environment variable ARVADOS_API_HOST")
var MissingArvadosApiToken = errors.New("Missing required environment variable ARVADOS_API_TOKEN")
// such failures by always using a new or recently active socket.
var MaxIdleConnectionDuration = 30 * time.Second
-// Indicates an error that was returned by the API server.
+var RetryDelay = 2 * time.Second
+
+var (
+ defaultInsecureHTTPClient *http.Client
+ defaultSecureHTTPClient *http.Client
+ defaultHTTPClientMtx sync.Mutex
+)
+
+// APIServerError contains an error that was returned by the API server.
type APIServerError struct {
// Address of server returning error, of the form "host:port".
ServerAddress string
e.HttpStatusCode,
e.HttpStatusMessage,
e.ServerAddress)
- } else {
- return fmt.Sprintf("arvados API server error: %d: %s returned by %s",
- e.HttpStatusCode,
- e.HttpStatusMessage,
- e.ServerAddress)
}
+ return fmt.Sprintf("arvados API server error: %d: %s returned by %s",
+ e.HttpStatusCode,
+ e.HttpStatusMessage,
+ e.ServerAddress)
+}
+
+// StringBool tests whether s is suggestive of true. It returns true
+// if s is a mixed/uppoer/lower-case variant of "1", "yes", or "true".
+func StringBool(s string) bool {
+ s = strings.ToLower(s)
+ return s == "1" || s == "yes" || s == "true"
}
-// Helper type so we don't have to write out 'map[string]interface{}' every time.
+// Dict is a helper type so we don't have to write out 'map[string]interface{}' every time.
type Dict map[string]interface{}
-// Information about how to contact the Arvados server
+// ArvadosClient contains information about how to contact the Arvados server
type ArvadosClient struct {
// https
Scheme string
// the client is outside the cluster.
External bool
+ // Base URIs of Keep services, e.g., {"https://host1:8443",
+ // "https://host2:8443"}. If this is nil, Keep clients will
+ // use the arvados.v1.keep_services.accessible API to discover
+ // available services.
+ KeepServiceURIs []string
+
// Discovery document
DiscoveryDoc Dict
// Number of retries
Retries int
+
+ // X-Request-Id for outgoing requests
+ RequestID string
}
-// Create a new ArvadosClient, initialized with standard Arvados environment
-// variables ARVADOS_API_HOST, ARVADOS_API_TOKEN, and (optionally)
-// ARVADOS_API_HOST_INSECURE.
-func MakeArvadosClient() (ac ArvadosClient, err error) {
- var matchTrue = regexp.MustCompile("^(?i:1|yes|true)$")
- insecure := matchTrue.MatchString(os.Getenv("ARVADOS_API_HOST_INSECURE"))
- external := matchTrue.MatchString(os.Getenv("ARVADOS_EXTERNAL_CLIENT"))
+var CertFiles = []string{
+ "/etc/arvados/ca-certificates.crt",
+ "/etc/ssl/certs/ca-certificates.crt", // Debian/Ubuntu/Gentoo etc.
+ "/etc/pki/tls/certs/ca-bundle.crt", // Fedora/RHEL
+}
- ac = ArvadosClient{
- Scheme: "https",
- ApiServer: os.Getenv("ARVADOS_API_HOST"),
- ApiToken: os.Getenv("ARVADOS_API_TOKEN"),
- ApiInsecure: insecure,
- Client: &http.Client{Transport: &http.Transport{
- TLSClientConfig: &tls.Config{InsecureSkipVerify: insecure}}},
- External: external,
- Retries: 2}
-
- if ac.ApiServer == "" {
- return ac, MissingArvadosApiHost
+// MakeTLSConfig sets up TLS configuration for communicating with
+// Arvados and Keep services.
+func MakeTLSConfig(insecure bool) *tls.Config {
+ tlsconfig := tls.Config{InsecureSkipVerify: insecure}
+
+ if !insecure {
+ // Use the first entry in CertFiles that we can read
+ // certificates from. If none of those work out, use
+ // the Go defaults.
+ certs := x509.NewCertPool()
+ for _, file := range CertFiles {
+ data, err := ioutil.ReadFile(file)
+ if err != nil {
+ if !os.IsNotExist(err) {
+ log.Printf("proceeding without loading cert file %q: %s", file, err)
+ }
+ continue
+ }
+ if !certs.AppendCertsFromPEM(data) {
+ log.Printf("unable to load any certificates from %v", file)
+ continue
+ }
+ tlsconfig.RootCAs = certs
+ break
+ }
}
- if ac.ApiToken == "" {
- return ac, MissingArvadosApiToken
+
+ return &tlsconfig
+}
+
+// New returns an ArvadosClient using the given arvados.Client
+// configuration. This is useful for callers who load arvados.Client
+// fields from configuration files but still need to use the
+// arvadosclient.ArvadosClient package.
+func New(c *arvados.Client) (*ArvadosClient, error) {
+ ac := &ArvadosClient{
+ Scheme: "https",
+ ApiServer: c.APIHost,
+ ApiToken: c.AuthToken,
+ ApiInsecure: c.Insecure,
+ Client: &http.Client{
+ Timeout: 5 * time.Minute,
+ Transport: &http.Transport{
+ TLSClientConfig: MakeTLSConfig(c.Insecure)},
+ },
+ External: false,
+ Retries: 2,
+ KeepServiceURIs: c.KeepServiceURIs,
+ lastClosedIdlesAt: time.Now(),
}
- ac.lastClosedIdlesAt = time.Now()
+ return ac, nil
+}
- return ac, err
+// MakeArvadosClient creates a new ArvadosClient using the standard
+// environment variables ARVADOS_API_HOST, ARVADOS_API_TOKEN,
+// ARVADOS_API_HOST_INSECURE, ARVADOS_EXTERNAL_CLIENT, and
+// ARVADOS_KEEP_SERVICES.
+func MakeArvadosClient() (ac *ArvadosClient, err error) {
+ ac, err = New(arvados.NewClientFromEnv())
+ if err != nil {
+ return
+ }
+ ac.External = StringBool(os.Getenv("ARVADOS_EXTERNAL_CLIENT"))
+ return
}
// CallRaw is the same as Call() but returns a Reader that reads the
// response body, instead of taking an output object.
-func (c ArvadosClient) CallRaw(method string, resourceType string, uuid string, action string, parameters Dict) (reader io.ReadCloser, err error) {
+func (c *ArvadosClient) CallRaw(method string, resourceType string, uuid string, action string, parameters Dict) (reader io.ReadCloser, err error) {
scheme := c.Scheme
if scheme == "" {
scheme = "https"
}
+ if c.ApiServer == "" {
+ return nil, fmt.Errorf("Arvados client is not configured (target API host is not set). Maybe env var ARVADOS_API_HOST should be set first?")
+ }
u := url.URL{
Scheme: scheme,
Host: c.ApiServer}
- if resourceType != API_DISCOVERY_RESOURCE {
+ if resourceType != ApiDiscoveryResource {
u.Path = "/arvados/v1"
}
}
}
+ retryable := false
+ switch method {
+ case "GET", "HEAD", "PUT", "OPTIONS", "DELETE":
+ retryable = true
+ }
+
+ // Non-retryable methods such as POST are not safe to retry automatically,
+ // so we minimize such failures by always using a new or recently active socket
+ if !retryable {
+ if time.Since(c.lastClosedIdlesAt) > MaxIdleConnectionDuration {
+ c.lastClosedIdlesAt = time.Now()
+ c.Client.Transport.(*http.Transport).CloseIdleConnections()
+ }
+ }
+
// Make the request
- remainingTries := 1 + c.Retries
var req *http.Request
var resp *http.Response
- var errs []string
- var badResp bool
- for remainingTries > 0 {
+ for attempt := 0; attempt <= c.Retries; attempt++ {
if method == "GET" || method == "HEAD" {
u.RawQuery = vals.Encode()
if req, err = http.NewRequest(method, u.String(), nil); err != nil {
// Add api token header
req.Header.Add("Authorization", fmt.Sprintf("OAuth2 %s", c.ApiToken))
+ if c.RequestID != "" {
+ req.Header.Add("X-Request-Id", c.RequestID)
+ }
if c.External {
req.Header.Add("X-External-Client", "1")
}
- // POST and DELETE are not safe to retry automatically, so we minimize
- // such failures by always using a new or recently active socket
- if method == "POST" || method == "DELETE" {
- if time.Since(c.lastClosedIdlesAt) > MaxIdleConnectionDuration {
- c.lastClosedIdlesAt = time.Now()
- c.Client.Transport.(*http.Transport).CloseIdleConnections()
- }
- }
-
resp, err = c.Client.Do(req)
if err != nil {
- if method == "GET" || method == "HEAD" || method == "PUT" {
- errs = append(errs, err.Error())
- badResp = false
- remainingTries -= 1
+ if retryable {
+ time.Sleep(RetryDelay)
continue
} else {
return nil, err
defer resp.Body.Close()
- if resp.StatusCode == 408 ||
- resp.StatusCode == 409 ||
- resp.StatusCode == 422 ||
- resp.StatusCode == 423 ||
- resp.StatusCode == 500 ||
- resp.StatusCode == 502 ||
- resp.StatusCode == 503 ||
- resp.StatusCode == 504 {
- badResp = true
- remainingTries -= 1
+ switch resp.StatusCode {
+ case 408, 409, 422, 423, 500, 502, 503, 504:
+ time.Sleep(RetryDelay)
continue
- } else {
+ default:
return nil, newAPIServerError(c.ApiServer, resp)
}
}
- if badResp {
+ if resp != nil {
return nil, newAPIServerError(c.ApiServer, resp)
- } else {
- return nil, fmt.Errorf("%v", errs)
}
+ return nil, err
}
func newAPIServerError(ServerAddress string, resp *http.Response) APIServerError {
// Returns a non-nil error if an error occurs making the API call, the
// API responds with a non-successful HTTP status, or an error occurs
// parsing the response body.
-func (c ArvadosClient) Call(method string, resourceType string, uuid string, action string, parameters Dict, output interface{}) error {
+func (c *ArvadosClient) Call(method, resourceType, uuid, action string, parameters Dict, output interface{}) error {
reader, err := c.CallRaw(method, resourceType, uuid, action, parameters)
if reader != nil {
defer reader.Close()
}
// Create a new resource. See Call for argument descriptions.
-func (c ArvadosClient) Create(resourceType string, parameters Dict, output interface{}) error {
+func (c *ArvadosClient) Create(resourceType string, parameters Dict, output interface{}) error {
return c.Call("POST", resourceType, "", "", parameters, output)
}
// Delete a resource. See Call for argument descriptions.
-func (c ArvadosClient) Delete(resource string, uuid string, parameters Dict, output interface{}) (err error) {
+func (c *ArvadosClient) Delete(resource string, uuid string, parameters Dict, output interface{}) (err error) {
return c.Call("DELETE", resource, uuid, "", parameters, output)
}
-// Modify attributes of a resource. See Call for argument descriptions.
-func (c ArvadosClient) Update(resourceType string, uuid string, parameters Dict, output interface{}) (err error) {
+// Update attributes of a resource. See Call for argument descriptions.
+func (c *ArvadosClient) Update(resourceType string, uuid string, parameters Dict, output interface{}) (err error) {
return c.Call("PUT", resourceType, uuid, "", parameters, output)
}
// Get a resource. See Call for argument descriptions.
-func (c ArvadosClient) Get(resourceType string, uuid string, parameters Dict, output interface{}) (err error) {
+func (c *ArvadosClient) Get(resourceType string, uuid string, parameters Dict, output interface{}) (err error) {
if !UUIDMatch(uuid) && !(resourceType == "collections" && PDHMatch(uuid)) {
// No object has uuid == "": there is no need to make
// an API call. Furthermore, the HTTP request for such
}
// List resources of a given type. See Call for argument descriptions.
-func (c ArvadosClient) List(resource string, parameters Dict, output interface{}) (err error) {
+func (c *ArvadosClient) List(resource string, parameters Dict, output interface{}) (err error) {
return c.Call("GET", resource, "", "", parameters, output)
}
-const API_DISCOVERY_RESOURCE = "discovery/v1/apis/arvados/v1/rest"
+const ApiDiscoveryResource = "discovery/v1/apis/arvados/v1/rest"
// Discovery returns the value of the given parameter in the discovery
// document. Returns a non-nil error if the discovery document cannot
func (c *ArvadosClient) Discovery(parameter string) (value interface{}, err error) {
if len(c.DiscoveryDoc) == 0 {
c.DiscoveryDoc = make(Dict)
- err = c.Call("GET", API_DISCOVERY_RESOURCE, "", "", nil, &c.DiscoveryDoc)
+ err = c.Call("GET", ApiDiscoveryResource, "", "", nil, &c.DiscoveryDoc)
if err != nil {
return nil, err
}
value, found = c.DiscoveryDoc[parameter]
if found {
return value, nil
- } else {
- return value, ErrInvalidArgument
}
+ return value, ErrInvalidArgument
+}
+
+// ClusterConfig returns the value of the given key in the current cluster's
+// exported config. If key is an empty string, it'll return the entire config.
+func (c *ArvadosClient) ClusterConfig(key string) (config interface{}, err error) {
+ var clusterConfig interface{}
+ err = c.Call("GET", "config", "", "", nil, &clusterConfig)
+ if err != nil {
+ return nil, err
+ }
+ if key == "" {
+ return clusterConfig, nil
+ }
+ configData, ok := clusterConfig.(map[string]interface{})[key]
+ if !ok {
+ return nil, ErrInvalidArgument
+ }
+ return configData, nil
+}
+
+func (c *ArvadosClient) httpClient() *http.Client {
+ if c.Client != nil {
+ return c.Client
+ }
+ cl := &defaultSecureHTTPClient
+ if c.ApiInsecure {
+ cl = &defaultInsecureHTTPClient
+ }
+ if *cl == nil {
+ defaultHTTPClientMtx.Lock()
+ defer defaultHTTPClientMtx.Unlock()
+ *cl = &http.Client{Transport: &http.Transport{
+ TLSClientConfig: MakeTLSConfig(c.ApiInsecure)}}
+ }
+ return *cl
}