-
Notifications
You must be signed in to change notification settings - Fork 365
/
client.go
543 lines (493 loc) · 18.4 KB
/
client.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
package common
import (
"context"
"crypto/tls"
"encoding/base64"
"fmt"
"log"
"net/http"
"net/url"
"os"
"reflect"
"strings"
"sync"
"time"
"golang.org/x/time/rate"
"google.golang.org/api/option"
"github.com/Azure/go-autorest/autorest"
"github.com/Azure/go-autorest/autorest/azure"
"github.com/hashicorp/go-retryablehttp"
"github.com/hashicorp/terraform-plugin-sdk/v2/helper/schema"
"github.com/mitchellh/go-homedir"
"gopkg.in/ini.v1"
)
// Default settings
const (
DefaultTruncateBytes = 96
DefaultRateLimitPerSecond = 15
DefaultHTTPTimeoutSeconds = 60
)
// DatabricksClient holds properties needed for authentication and HTTP client setup
// fields with `name` struct tags become Terraform provider attributes. `env` struct tag
// can hold one or more coma-separated env variable names to find value, if not specified
// directly. `auth` struct tag describes the type of conflicting authentication used.
type DatabricksClient struct {
Host string `name:"host" env:"DATABRICKS_HOST"`
Token string `name:"token" env:"DATABRICKS_TOKEN" auth:"token,sensitive"`
Username string `name:"username" env:"DATABRICKS_USERNAME" auth:"password"`
Password string `name:"password" env:"DATABRICKS_PASSWORD" auth:"password,sensitive"`
// Databricks Account ID for Accounts API. This field is used in dependencies.
AccountID string `name:"account_id" env:"DATABRICKS_ACCOUNT_ID"`
// Connection profile specified within ~/.databrickscfg.
Profile string `name:"profile" env:"DATABRICKS_CONFIG_PROFILE" auth:"config profile"`
// Location of the Databricks CLI credentials file, that is created
// by `databricks configure --token` command. By default, it is located
// in ~/.databrickscfg.
ConfigFile string `name:"config_file" env:"DATABRICKS_CONFIG_FILE"`
GoogleServiceAccount string `name:"google_service_account" env:"DATABRICKS_GOOGLE_SERVICE_ACCOUNT" auth:"google"`
GoogleCredentials string `name:"google_credentials" env:"GOOGLE_CREDENTIALS" auth:"google,sensitive"`
AzureResourceID string `name:"azure_workspace_resource_id" env:"DATABRICKS_AZURE_RESOURCE_ID" auth:"azure"`
AzureUseMSI bool `name:"azure_use_msi" env:"ARM_USE_MSI" auth:"azure"`
AzureClientSecret string `name:"azure_client_secret" env:"ARM_CLIENT_SECRET" auth:"azure,sensitive"`
AzureClientID string `name:"azure_client_id" env:"ARM_CLIENT_ID" auth:"azure"`
AzureTenantID string `name:"azure_tenant_id" env:"ARM_TENANT_ID" auth:"azure"`
AzurermEnvironment string `name:"azure_environment" env:"ARM_ENVIRONMENT"`
AzureDatabricksLoginAppId string `name:"azure_login_app_id" env:"DATABRICKS_AZURE_LOGIN_APP_ID" auth:"azure"`
// When multiple auth attributes are available in the environment, use the auth type
// specified by this argument. This argument also holds currently selected auth.
AuthType string `name:"auth_type" auth:"-"`
// Azure Environment endpoints
AzureEnvironment *azure.Environment
// Skip SSL certificate verification for HTTP calls.
// Use at your own risk or for unit testing purposes.
InsecureSkipVerify bool `name:"skip_verify" auth:"-"`
HTTPTimeoutSeconds int `name:"http_timeout_seconds" auth:"-"`
// Truncate JSON fields in JSON above this limit. Default is 96.
DebugTruncateBytes int `name:"debug_truncate_bytes" env:"DATABRICKS_DEBUG_TRUNCATE_BYTES" auth:"-"`
// Debug HTTP headers of requests made by the provider. Default is false.
DebugHeaders bool `name:"debug_headers" env:"DATABRICKS_DEBUG_HEADERS" auth:"-"`
// Maximum number of requests per second made to Databricks REST API.
RateLimitPerSecond int `name:"rate_limit" env:"DATABRICKS_RATE_LIMIT" auth:"-"`
// OAuth token refreshers for Azure to be used within `authVisitor`
azureAuthorizer autorest.Authorizer
// options used to enable unit testing mode for OIDC
googleAuthOptions []option.ClientOption
// Mutex used by Authenticate method to guard `authVisitor`, which
// has to be lazily created on the first request to Databricks API.
// It is done because databricks host and token may often be available
// only in the middle of Terraform DAG execution.
authMutex sync.Mutex
// HTTP request interceptor, that assigns Authorization header
authVisitor func(r *http.Request) error
// Databricks REST API rate limiter
rateLimiter *rate.Limiter
// Terraform provider instance to include Terraform binary version in
// User-Agent header
Provider *schema.Provider
// retryalble HTTP client
httpClient *retryablehttp.Client
// configuration attributes that were used to initialise client.
configAttributesUsed []string
// callback used to create API1.2 call wrapper, which simplifies unit tessting
commandFactory func(context.Context, *DatabricksClient) CommandExecutor
}
type ConfigAttribute struct {
Name string
Kind reflect.Kind
EnvVars []string
Auth string
Sensitive bool
Internal bool
num int
}
func (ca *ConfigAttribute) Set(client *DatabricksClient, i any) error {
rv := reflect.ValueOf(client)
field := rv.Elem().Field(ca.num)
switch ca.Kind {
case reflect.String:
field.SetString(i.(string))
case reflect.Bool:
field.SetBool(i.(bool))
case reflect.Int:
field.SetInt(int64(i.(int)))
default:
// must extensively test with providerFixture to avoid this one
return fmt.Errorf("cannot set %s of unknown type %s", ca.Name, reflectKind(ca.Kind))
}
return nil
}
func (ca *ConfigAttribute) GetString(client *DatabricksClient) string {
rv := reflect.ValueOf(client)
field := rv.Elem().Field(ca.num)
return fmt.Sprintf("%v", field.Interface())
}
// ClientAttributes returns meta-representation of DatabricksClient configuration options
func ClientAttributes() (attrs []ConfigAttribute) {
t := reflect.TypeOf(DatabricksClient{})
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
nameTag := field.Tag.Get("name")
if nameTag == "" {
continue
}
sensitive := false
auth := field.Tag.Get("auth")
authSplit := strings.Split(auth, ",")
if len(authSplit) == 2 {
auth = authSplit[0]
sensitive = authSplit[1] == "sensitive"
}
// internal config fields are skipped in debugging
internal := false
if auth == "-" {
auth = ""
internal = true
}
attr := ConfigAttribute{
Name: nameTag,
Auth: auth,
Kind: field.Type.Kind(),
Sensitive: sensitive,
Internal: internal,
num: i,
}
envTag := field.Tag.Get("env")
if envTag != "" {
attr.EnvVars = strings.Split(envTag, ",")
}
attrs = append(attrs, attr)
}
return
}
// Configure client to work, optionally specifying configuration attributes used
func (c *DatabricksClient) Configure(attrsUsed ...string) error {
c.configAttributesUsed = attrsUsed
c.configureHTTPCLient()
if c.DebugTruncateBytes == 0 {
c.DebugTruncateBytes = DefaultTruncateBytes
}
// AzureEnvironment could be used in the different contexts, not only for Auzre Authentication
// lack of this lead to crash (see issue #831)
azureEnvironment, err := c.getAzureEnvironment()
if err != nil {
return fmt.Errorf("cannot get azure environment: %w", err)
}
c.AzureEnvironment = &azureEnvironment
return nil
}
func (c *DatabricksClient) configDebugString() string {
debug := []string{}
for _, attr := range ClientAttributes() {
if attr.Internal && !c.DebugHeaders {
continue
}
value := attr.GetString(c)
if value == "" {
continue
}
if attr.Name == "azure_use_msi" && value == "false" {
// include Azure MSI info only when it's relevant
continue
}
if attr.Sensitive {
value = "***REDACTED***"
}
debug = append(debug, fmt.Sprintf("%s=%v", attr.Name, value))
}
return strings.Join(debug, ", ") // lgtm[go/clear-text-logging]
}
// Authenticate lazily authenticates across authorizers or returns error
func (c *DatabricksClient) Authenticate(ctx context.Context) error {
if c.authVisitor != nil {
return nil
}
c.authMutex.Lock()
defer c.authMutex.Unlock()
if c.authVisitor != nil {
return nil
}
// Fix host prior to auth, because it may be used in the OIDC flow as "audience" field.
// If necessary, this function adds a scheme and strips a trailing slash.
if err := c.fixHost(); err != nil {
return err
}
type auth struct {
configure func(context.Context) (func(*http.Request) error, error)
name string
}
providers := []auth{
{c.configureWithPat, "pat"},
{c.configureWithBasicAuth, "basic"},
{c.configureWithAzureClientSecret, "azure-client-secret"},
{c.configureWithAzureManagedIdentity, "azure-msi"},
{c.configureWithAzureCLI, "azure-cli"},
{c.configureWithGoogleCrendentials, "google-creds"},
{c.configureWithGoogleForAccountsAPI, "google-accounts"},
{c.configureWithGoogleForWorkspace, "google-workspace"},
{c.configureWithDatabricksCfg, "databricks-cli"},
}
// try configuring authentication with different methods
for _, auth := range providers {
if c.AuthType != "" && auth.name != c.AuthType {
// ignore other auth types if one is explicitly enforced
log.Printf("[INFO] Ignoring %s auth, because %s is preferred", auth.name, c.AuthType)
continue
}
authorizer, err := auth.configure(ctx)
if err != nil {
return c.niceAuthError(fmt.Sprintf("cannot configure %s auth: %s", auth.name, err))
}
if authorizer == nil {
// try the next method.
continue
}
// even though this may complain about clear text logging, passwords are replaced with `***`
log.Printf("[INFO] Configured %s auth: %s", auth.name, c.configDebugString()) // lgtm[go/clear-text-logging]
c.authVisitor = authorizer
c.AuthType = auth.name
c.fixHost()
return nil
}
if c.AuthType != "" {
return c.niceAuthError(fmt.Sprintf("cannot configure %s auth", c.AuthType))
}
if c.Host == "" && IsData.GetOrUnknown(ctx) == "yes" {
return c.niceAuthError("workspace is most likely not created yet, because the `host` " +
"is empty. Please add `depends_on = [databricks_mws_workspaces.this]` or " +
"`depends_on = [azurerm_databricks_workspace.this]` to every data resource. See " +
"https://www.terraform.io/docs/language/resources/behavior.html more info")
}
return c.niceAuthError("authentication is not configured for provider.")
}
func (c *DatabricksClient) niceAuthError(message string) error {
info := ""
if len(c.configAttributesUsed) > 0 {
envs := []string{}
attrs := []string{}
usedAsEnv := map[string]bool{}
for _, attr := range ClientAttributes() {
if len(attr.EnvVars) == 0 {
continue
}
for _, envVar := range attr.EnvVars {
value := os.Getenv(envVar)
if value == "" {
continue
}
usedAsEnv[attr.Name] = true
envs = append(envs, envVar)
}
}
for _, attr := range c.configAttributesUsed {
if usedAsEnv[attr] {
continue
}
attrs = append(attrs, attr)
}
infos := []string{}
if len(attrs) > 0 {
infos = append(infos, fmt.Sprintf("Attributes used: %s", strings.Join(attrs, ", ")))
}
if len(envs) > 0 {
infos = append(infos, fmt.Sprintf("Environment variables used: %s", strings.Join(envs, ", ")))
}
info = ". " + strings.Join(infos, ". ")
}
info = strings.TrimSuffix(info, ".")
message = strings.TrimSuffix(message, ".")
docUrl := "https://registry.terraform.io/providers/databricks/databricks/latest/docs#authentication"
return fmt.Errorf("%s%s. Please check %s for details", message, info, docUrl)
}
func (c *DatabricksClient) fixHost() error {
// Nothing to fix if the host isn't set.
if c.Host == "" {
return nil
}
u, err := url.Parse(c.Host)
if err != nil {
return err
}
// If the host is empty, assume the scheme wasn't included.
if u.Host == "" {
u, err = url.Parse("https://" + c.Host)
if err != nil {
return err
}
}
// Create new instance to ensure other fields are initialized as empty.
u = &url.URL{
Scheme: u.Scheme,
Host: u.Host,
}
// Store sanitized version of c.Host.
c.Host = u.String()
return nil
}
func (c *DatabricksClient) configureWithPat(ctx context.Context) (func(*http.Request) error, error) {
if !(c.Token != "" && c.Host != "") {
return nil, nil
}
log.Printf("[INFO] Using directly configured PAT authentication")
return c.authorizer("Bearer", c.Token), nil
}
func (c *DatabricksClient) configureWithBasicAuth(ctx context.Context) (func(*http.Request) error, error) {
if !(c.Username != "" && c.Password != "" && c.Host != "") {
return nil, nil
}
b64 := c.encodeBasicAuth(c.Username, c.Password)
log.Printf("[INFO] Using directly configured basic authentication")
return c.authorizer("Basic", b64), nil
}
func (c *DatabricksClient) configureWithDatabricksCfg(ctx context.Context) (func(r *http.Request) error, error) {
configFile := c.ConfigFile
if configFile == "" {
configFile = "~/.databrickscfg"
}
configFile, err := homedir.Expand(configFile)
if err != nil {
return nil, fmt.Errorf("cannot find homedir: %w", err)
}
_, err = os.Stat(configFile)
if os.IsNotExist(err) {
// early return for non-configured machines
log.Printf("[DEBUG] %s not found on current host", configFile)
return nil, nil
}
cfg, err := ini.Load(configFile)
if err != nil {
return nil, fmt.Errorf("cannot parse config file: %w", err)
}
if c.Profile == "" {
log.Printf("[INFO] Using DEFAULT profile from %s", configFile)
c.Profile = "DEFAULT"
}
dbcli := cfg.Section(c.Profile)
if len(dbcli.Keys()) == 0 {
// here we meet a heavy user of Databricks CLI
return nil, fmt.Errorf("%s has no %s profile configured", configFile, c.Profile)
}
c.Host = dbcli.Key("host").String()
if c.Host == "" {
return nil, fmt.Errorf("config file %s is corrupt: cannot find host in %s profile",
configFile, c.Profile)
}
token := ""
authType := "Bearer"
if dbcli.HasKey("username") && dbcli.HasKey("password") {
c.Username = dbcli.Key("username").String()
c.Password = dbcli.Key("password").String()
token = c.encodeBasicAuth(c.Username, c.Password)
authType = "Basic"
} else {
c.Token = dbcli.Key("token").String()
token = c.Token
}
if token == "" {
return nil, fmt.Errorf("config file %s is corrupt: cannot find token in %s profile",
configFile, c.Profile)
}
log.Printf("[INFO] Using %s authentication from ~/.databrickscfg", authType)
return c.authorizer(authType, token), nil
}
func (c *DatabricksClient) authorizer(authType, token string) func(r *http.Request) error {
return func(r *http.Request) error {
r.Header.Set("Authorization", fmt.Sprintf("%s %s", authType, token))
return nil
}
}
func (c *DatabricksClient) encodeBasicAuth(username, password string) string {
tokenUnB64 := fmt.Sprintf("%s:%s", username, password)
return base64.StdEncoding.EncodeToString([]byte(tokenUnB64))
}
func (c *DatabricksClient) configureHTTPCLient() {
if c.HTTPTimeoutSeconds == 0 {
c.HTTPTimeoutSeconds = DefaultHTTPTimeoutSeconds
}
if c.RateLimitPerSecond == 0 {
c.RateLimitPerSecond = DefaultRateLimitPerSecond
}
c.rateLimiter = rate.NewLimiter(rate.Limit(c.RateLimitPerSecond), 1)
// Set up a retryable HTTP Client to handle cases where the service returns
// a transient error on initial creation
retryDelayDuration := 10 * time.Second
retryMaximumDuration := 5 * time.Minute
defaultTransport := http.DefaultTransport.(*http.Transport)
c.httpClient = &retryablehttp.Client{
HTTPClient: &http.Client{
Timeout: time.Duration(c.HTTPTimeoutSeconds) * time.Second,
Transport: &http.Transport{
Proxy: defaultTransport.Proxy,
DialContext: defaultTransport.DialContext,
MaxIdleConns: defaultTransport.MaxIdleConns,
IdleConnTimeout: defaultTransport.IdleConnTimeout * 3,
TLSHandshakeTimeout: defaultTransport.TLSHandshakeTimeout * 3,
ExpectContinueTimeout: defaultTransport.ExpectContinueTimeout,
TLSClientConfig: &tls.Config{
InsecureSkipVerify: c.InsecureSkipVerify,
},
},
},
CheckRetry: c.checkHTTPRetry,
// Using a linear retry rather than the default exponential retry
// as the creation condition is normally passed after 30-40 seconds
// Setting the retry interval to 10 seconds. Setting RetryWaitMin and RetryWaitMax
// to the same value removes jitter (which would be useful in a high-volume traffic scenario
// but wouldn't add much here)
Backoff: retryablehttp.LinearJitterBackoff,
RetryWaitMin: retryDelayDuration,
RetryWaitMax: retryDelayDuration,
RetryMax: int(retryMaximumDuration / retryDelayDuration),
}
}
// IsAzure returns true if client is configured for Azure Databricks - either by using AAD auth or with host+token combination
func (c *DatabricksClient) IsAzure() bool {
return c.AzureResourceID != "" || c.AzureClientID != "" || c.AzureUseMSI || strings.Contains(c.Host, ".azuredatabricks.net")
}
// IsAws returns true if client is configured for AWS
func (c *DatabricksClient) IsAws() bool {
return !c.IsAzure() && !c.IsGcp()
}
// IsGcp returns true if client is configured for GCP
func (c *DatabricksClient) IsGcp() bool {
return c.GoogleServiceAccount != "" || strings.Contains(c.Host, ".gcp.databricks.com")
}
// FormatURL creates URL from the client Host and additional strings
func (c *DatabricksClient) FormatURL(strs ...string) string {
host := c.Host
if !strings.HasSuffix(host, "/") {
host += "/"
}
data := append([]string{host}, strs...)
return strings.Join(data, "")
}
// ClientForHost creates a new DatabricksClient instance with the same auth parameters,
// but for the given host. Authentication has to be reinitialized, as Google OIDC has
// different authorizers, depending if it's workspace or Accounts API we're talking to.
func (c *DatabricksClient) ClientForHost(ctx context.Context, url string) (*DatabricksClient, error) {
log.Printf("[INFO] Creating client for host %s based on %s", url, c.configDebugString()) // lgtm[go/clear-text-logging]
// Ensure that client is authenticated
err := c.Authenticate(ctx)
if err != nil {
return nil, fmt.Errorf("cannot authenticate parent client: %w", err)
}
// copy all client configuration options except Databricks CLI profile
return &DatabricksClient{
Host: url,
Username: c.Username,
Password: c.Password,
Token: c.Token,
GoogleServiceAccount: c.GoogleServiceAccount,
GoogleCredentials: c.GoogleCredentials,
AzurermEnvironment: c.AzurermEnvironment,
InsecureSkipVerify: c.InsecureSkipVerify,
HTTPTimeoutSeconds: c.HTTPTimeoutSeconds,
DebugTruncateBytes: c.DebugTruncateBytes,
DebugHeaders: c.DebugHeaders,
RateLimitPerSecond: c.RateLimitPerSecond,
Provider: c.Provider,
rateLimiter: c.rateLimiter,
httpClient: c.httpClient,
configAttributesUsed: c.configAttributesUsed,
commandFactory: c.commandFactory,
}, nil
}