types.go 17.1 KB
Newer Older
Jeffrey Morgan's avatar
Jeffrey Morgan committed
1
2
package api

3
import (
Michael Yang's avatar
Michael Yang committed
4
	"encoding/json"
5
	"errors"
6
	"fmt"
7
	"log/slog"
Michael Yang's avatar
Michael Yang committed
8
	"math"
9
	"os"
10
	"reflect"
11
	"strconv"
12
	"strings"
13
14
	"time"
)
Michael Yang's avatar
Michael Yang committed
15

16
// StatusError is an error with and HTTP status code.
Patrick Devine's avatar
Patrick Devine committed
17
type StatusError struct {
18
19
20
	StatusCode   int
	Status       string
	ErrorMessage string `json:"error"`
Patrick Devine's avatar
Patrick Devine committed
21
22
23
}

func (e StatusError) Error() string {
24
25
26
27
28
29
30
31
32
33
	switch {
	case e.Status != "" && e.ErrorMessage != "":
		return fmt.Sprintf("%s: %s", e.Status, e.ErrorMessage)
	case e.Status != "":
		return e.Status
	case e.ErrorMessage != "":
		return e.ErrorMessage
	default:
		// this should not happen
		return "something went wrong, please see the ollama server logs for details"
Patrick Devine's avatar
Patrick Devine committed
34
35
36
	}
}

37
// ImageData represents the raw binary data of an image file.
Patrick Devine's avatar
Patrick Devine committed
38
39
type ImageData []byte

40
41
42
// GenerateRequest describes a request sent by [Client.Generate]. While you
// have to specify the Model and Prompt fields, all the other fields have
// reasonable defaults for basic uses.
43
type GenerateRequest struct {
44
45
46
	// Model is the model name; it should be a name familiar to Ollama from
	// the library at https://ollama.com/library
	Model string `json:"model"`
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
	// Prompt is the textual prompt to send to the model.
	Prompt string `json:"prompt"`

	// System overrides the model's default system message/prompt.
	System string `json:"system"`

	// Template overrides the model's default prompt template.
	Template string `json:"template"`

	// Context is the context parameter returned from a previous call to
	// Generate call. It can be used to keep a short conversational memory.
	Context []int `json:"context,omitempty"`

	// Stream specifies whether the response is streaming; it is true by default.
	Stream *bool `json:"stream,omitempty"`

	// Raw set to true means that no formatting will be applied to the prompt.
	Raw bool `json:"raw,omitempty"`

	// Format specifies the format to return a response in.
	Format string `json:"format"`

	// KeepAlive controls how long the model will stay loaded in memory following
	// this request.
	KeepAlive *Duration `json:"keep_alive,omitempty"`

	// Images is an optional list of base64-encoded images accompanying this
	// request, for multimodal models.
	Images []ImageData `json:"images,omitempty"`

	// Options lists model-specific options. For example, temperature can be
	// set through this field, if the model supports it.
80
	Options map[string]interface{} `json:"options"`
81
82
}

83
// ChatRequest describes a request sent by [Client.Chat].
Bruce MacDonald's avatar
Bruce MacDonald committed
84
type ChatRequest struct {
85
86
87
88
89
90
91
92
93
94
95
96
97
98
	// Model is the model name, as in [GenerateRequest].
	Model string `json:"model"`

	// Messages is the messages of the chat - can be used to keep a chat memory.
	Messages []Message `json:"messages"`

	// Stream enable streaming of returned response; true by default.
	Stream *bool `json:"stream,omitempty"`

	// Format is the format to return the response in (e.g. "json").
	Format string `json:"format"`

	// KeepAlive controls how long the model will stay loaded into memory
	// followin the request.
99
	KeepAlive *Duration `json:"keep_alive,omitempty"`
Bruce MacDonald's avatar
Bruce MacDonald committed
100

101
	// Options lists model-specific options.
Bruce MacDonald's avatar
Bruce MacDonald committed
102
103
104
	Options map[string]interface{} `json:"options"`
}

105
106
107
// Message is a single message in a chat sequence. The message contains the
// role ("system", "user", or "assistant"), the content and an optional list
// of images.
Bruce MacDonald's avatar
Bruce MacDonald committed
108
type Message struct {
109
	Role    string      `json:"role"`
110
	Content string      `json:"content"`
111
	Images  []ImageData `json:"images,omitempty"`
Bruce MacDonald's avatar
Bruce MacDonald committed
112
113
}

114
115
// ChatResponse is the response returned by [Client.Chat]. Its fields are
// similar to [GenerateResponse].
Bruce MacDonald's avatar
Bruce MacDonald committed
116
type ChatResponse struct {
117
118
119
	Model      string    `json:"model"`
	CreatedAt  time.Time `json:"created_at"`
	Message    Message   `json:"message"`
Bruce MacDonald's avatar
Bruce MacDonald committed
120
	DoneReason string    `json:"done_reason,omitempty"`
Bruce MacDonald's avatar
Bruce MacDonald committed
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

	Done bool `json:"done"`

	Metrics
}

type Metrics struct {
	TotalDuration      time.Duration `json:"total_duration,omitempty"`
	LoadDuration       time.Duration `json:"load_duration,omitempty"`
	PromptEvalCount    int           `json:"prompt_eval_count,omitempty"`
	PromptEvalDuration time.Duration `json:"prompt_eval_duration,omitempty"`
	EvalCount          int           `json:"eval_count,omitempty"`
	EvalDuration       time.Duration `json:"eval_duration,omitempty"`
}

136
137
// Options specified in [GenerateRequest], if you add a new option here add it
// to the API docs also.
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
type Options struct {
	Runner

	// Predict options used at runtime
	NumKeep          int      `json:"num_keep,omitempty"`
	Seed             int      `json:"seed,omitempty"`
	NumPredict       int      `json:"num_predict,omitempty"`
	TopK             int      `json:"top_k,omitempty"`
	TopP             float32  `json:"top_p,omitempty"`
	TFSZ             float32  `json:"tfs_z,omitempty"`
	TypicalP         float32  `json:"typical_p,omitempty"`
	RepeatLastN      int      `json:"repeat_last_n,omitempty"`
	Temperature      float32  `json:"temperature,omitempty"`
	RepeatPenalty    float32  `json:"repeat_penalty,omitempty"`
	PresencePenalty  float32  `json:"presence_penalty,omitempty"`
	FrequencyPenalty float32  `json:"frequency_penalty,omitempty"`
	Mirostat         int      `json:"mirostat,omitempty"`
	MirostatTau      float32  `json:"mirostat_tau,omitempty"`
	MirostatEta      float32  `json:"mirostat_eta,omitempty"`
	PenalizeNewline  bool     `json:"penalize_newline,omitempty"`
	Stop             []string `json:"stop,omitempty"`
}

// Runner options which must be set when the model is loaded into memory
type Runner struct {
Michael Yang's avatar
Michael Yang committed
163
164
165
166
167
168
169
170
171
172
173
174
	UseNUMA   bool `json:"numa,omitempty"`
	NumCtx    int  `json:"num_ctx,omitempty"`
	NumBatch  int  `json:"num_batch,omitempty"`
	NumGPU    int  `json:"num_gpu,omitempty"`
	MainGPU   int  `json:"main_gpu,omitempty"`
	LowVRAM   bool `json:"low_vram,omitempty"`
	F16KV     bool `json:"f16_kv,omitempty"`
	LogitsAll bool `json:"logits_all,omitempty"`
	VocabOnly bool `json:"vocab_only,omitempty"`
	UseMMap   bool `json:"use_mmap,omitempty"`
	UseMLock  bool `json:"use_mlock,omitempty"`
	NumThread int  `json:"num_thread,omitempty"`
175
176
}

177
// EmbeddingRequest is the request passed to [Client.Embeddings].
Bruce MacDonald's avatar
Bruce MacDonald committed
178
type EmbeddingRequest struct {
179
180
181
182
183
184
185
186
	// Model is the model name.
	Model string `json:"model"`

	// Prompt is the textual prompt to embed.
	Prompt string `json:"prompt"`

	// KeepAlive controls how long the model will stay loaded in memory following
	// this request.
187
	KeepAlive *Duration `json:"keep_alive,omitempty"`
Bruce MacDonald's avatar
Bruce MacDonald committed
188

189
	// Options lists model-specific options.
Bruce MacDonald's avatar
Bruce MacDonald committed
190
191
192
	Options map[string]interface{} `json:"options"`
}

193
// EmbeddingResponse is the response from [Client.Embeddings].
Bruce MacDonald's avatar
Bruce MacDonald committed
194
195
196
197
type EmbeddingResponse struct {
	Embedding []float64 `json:"embedding"`
}

198
// CreateRequest is the request passed to [Client.Create].
199
type CreateRequest struct {
Michael Yang's avatar
Michael Yang committed
200
201
202
203
204
	Model        string `json:"model"`
	Path         string `json:"path"`
	Modelfile    string `json:"modelfile"`
	Stream       *bool  `json:"stream,omitempty"`
	Quantization string `json:"quantization,omitempty"`
Michael Yang's avatar
Michael Yang committed
205
206
207

	// Name is deprecated, see Model
	Name string `json:"name"`
208
209
}

210
// DeleteRequest is the request passed to [Client.Delete].
211
type DeleteRequest struct {
Michael Yang's avatar
Michael Yang committed
212
213
214
	Model string `json:"model"`

	// Name is deprecated, see Model
215
216
217
	Name string `json:"name"`
}

218
// ShowRequest is the request passed to [Client.Show].
Patrick Devine's avatar
Patrick Devine committed
219
type ShowRequest struct {
220
221
222
223
224
	Model    string `json:"model"`
	System   string `json:"system"`
	Template string `json:"template"`

	Options map[string]interface{} `json:"options"`
Michael Yang's avatar
Michael Yang committed
225
226
227

	// Name is deprecated, see Model
	Name string `json:"name"`
Patrick Devine's avatar
Patrick Devine committed
228
229
}

230
// ShowResponse is the response returned from [Client.Show].
Patrick Devine's avatar
Patrick Devine committed
231
type ShowResponse struct {
Patrick Devine's avatar
Patrick Devine committed
232
233
234
235
236
237
	License    string       `json:"license,omitempty"`
	Modelfile  string       `json:"modelfile,omitempty"`
	Parameters string       `json:"parameters,omitempty"`
	Template   string       `json:"template,omitempty"`
	System     string       `json:"system,omitempty"`
	Details    ModelDetails `json:"details,omitempty"`
238
	Messages   []Message    `json:"messages,omitempty"`
Patrick Devine's avatar
Patrick Devine committed
239
240
}

241
// CopyRequest is the request passed to [Client.Copy].
Patrick Devine's avatar
Patrick Devine committed
242
243
244
245
246
type CopyRequest struct {
	Source      string `json:"source"`
	Destination string `json:"destination"`
}

247
// PullRequest is the request passed to [Client.Pull].
Bruce MacDonald's avatar
Bruce MacDonald committed
248
type PullRequest struct {
Michael Yang's avatar
Michael Yang committed
249
	Model    string `json:"model"`
250
	Insecure bool   `json:"insecure,omitempty"`
251
252
253
	Username string `json:"username"`
	Password string `json:"password"`
	Stream   *bool  `json:"stream,omitempty"`
Michael Yang's avatar
Michael Yang committed
254
255
256

	// Name is deprecated, see Model
	Name string `json:"name"`
Bruce MacDonald's avatar
Bruce MacDonald committed
257
258
}

259
260
// ProgressResponse is the response passed to progress functions like
// [PullProgressFunc] and [PushProgressFunc].
261
type ProgressResponse struct {
262
263
	Status    string `json:"status"`
	Digest    string `json:"digest,omitempty"`
Michael Yang's avatar
Michael Yang committed
264
265
	Total     int64  `json:"total,omitempty"`
	Completed int64  `json:"completed,omitempty"`
Bruce MacDonald's avatar
Bruce MacDonald committed
266
267
}

268
// PushRequest is the request passed to [Client.Push].
269
type PushRequest struct {
Michael Yang's avatar
Michael Yang committed
270
	Model    string `json:"model"`
271
	Insecure bool   `json:"insecure,omitempty"`
272
273
274
	Username string `json:"username"`
	Password string `json:"password"`
	Stream   *bool  `json:"stream,omitempty"`
Michael Yang's avatar
Michael Yang committed
275
276
277

	// Name is deprecated, see Model
	Name string `json:"name"`
278
}
279

280
// ListResponse is the response from [Client.List].
Patrick Devine's avatar
Patrick Devine committed
281
type ListResponse struct {
282
	Models []ModelResponse `json:"models"`
Patrick Devine's avatar
Patrick Devine committed
283
284
}

285
// ModelResponse is a single model description in [ListResponse].
286
type ModelResponse struct {
Patrick Devine's avatar
Patrick Devine committed
287
	Name       string       `json:"name"`
Michael Yang's avatar
Michael Yang committed
288
	Model      string       `json:"model"`
Patrick Devine's avatar
Patrick Devine committed
289
290
291
292
	ModifiedAt time.Time    `json:"modified_at"`
	Size       int64        `json:"size"`
	Digest     string       `json:"digest"`
	Details    ModelDetails `json:"details,omitempty"`
Patrick Devine's avatar
Patrick Devine committed
293
294
}

Patrick Devine's avatar
Patrick Devine committed
295
296
297
298
type TokenResponse struct {
	Token string `json:"token"`
}

299
// GenerateResponse is the response passed into [GenerateResponseFunc].
Michael Yang's avatar
Michael Yang committed
300
type GenerateResponse struct {
301
302
303
304
	// Model is the model name that generated the response.
	Model string `json:"model"`

	//CreatedAt is the timestamp of the response.
305
306
	CreatedAt time.Time `json:"created_at"`

307
308
309
310
311
312
	// Response is the textual response itself.
	Response string `json:"response"`

	// Done specifies if the response is complete.
	Done bool `json:"done"`

313
	// DoneReason is the reason the model stopped generating text.
Bruce MacDonald's avatar
Bruce MacDonald committed
314
	DoneReason string `json:"done_reason,omitempty"`
315

316
317
	// Context is an encoding of the conversation used in this response; this
	// can be sent in the next request to keep a conversational memory.
Michael Yang's avatar
Michael Yang committed
318
	Context []int `json:"context,omitempty"`
319

Bruce MacDonald's avatar
Bruce MacDonald committed
320
	Metrics
321
322
}

323
// ModelDetails provides details about a model.
Patrick Devine's avatar
Patrick Devine committed
324
type ModelDetails struct {
325
	ParentModel       string   `json:"parent_model"`
Patrick Devine's avatar
Patrick Devine committed
326
327
328
329
330
331
332
	Format            string   `json:"format"`
	Family            string   `json:"family"`
	Families          []string `json:"families"`
	ParameterSize     string   `json:"parameter_size"`
	QuantizationLevel string   `json:"quantization_level"`
}

Bruce MacDonald's avatar
Bruce MacDonald committed
333
334
335
func (m *Metrics) Summary() {
	if m.TotalDuration > 0 {
		fmt.Fprintf(os.Stderr, "total duration:       %v\n", m.TotalDuration)
336
337
	}

Bruce MacDonald's avatar
Bruce MacDonald committed
338
339
	if m.LoadDuration > 0 {
		fmt.Fprintf(os.Stderr, "load duration:        %v\n", m.LoadDuration)
Michael Yang's avatar
Michael Yang committed
340
341
	}

Bruce MacDonald's avatar
Bruce MacDonald committed
342
343
	if m.PromptEvalCount > 0 {
		fmt.Fprintf(os.Stderr, "prompt eval count:    %d token(s)\n", m.PromptEvalCount)
344
345
	}

Bruce MacDonald's avatar
Bruce MacDonald committed
346
347
348
	if m.PromptEvalDuration > 0 {
		fmt.Fprintf(os.Stderr, "prompt eval duration: %s\n", m.PromptEvalDuration)
		fmt.Fprintf(os.Stderr, "prompt eval rate:     %.2f tokens/s\n", float64(m.PromptEvalCount)/m.PromptEvalDuration.Seconds())
349
350
	}

Bruce MacDonald's avatar
Bruce MacDonald committed
351
352
	if m.EvalCount > 0 {
		fmt.Fprintf(os.Stderr, "eval count:           %d token(s)\n", m.EvalCount)
353
354
	}

Bruce MacDonald's avatar
Bruce MacDonald committed
355
356
357
	if m.EvalDuration > 0 {
		fmt.Fprintf(os.Stderr, "eval duration:        %s\n", m.EvalDuration)
		fmt.Fprintf(os.Stderr, "eval rate:            %.2f tokens/s\n", float64(m.EvalCount)/m.EvalDuration.Seconds())
358
	}
359
360
}

361
var ErrInvalidHostPort = errors.New("invalid port specified in OLLAMA_HOST")
362

363
364
365
366
367
368
369
370
371
372
373
374
375
376
func (opts *Options) FromMap(m map[string]interface{}) error {
	valueOpts := reflect.ValueOf(opts).Elem() // names of the fields in the options struct
	typeOpts := reflect.TypeOf(opts).Elem()   // types of the fields in the options struct

	// build map of json struct tags to their types
	jsonOpts := make(map[string]reflect.StructField)
	for _, field := range reflect.VisibleFields(typeOpts) {
		jsonTag := strings.Split(field.Tag.Get("json"), ",")[0]
		if jsonTag != "" {
			jsonOpts[jsonTag] = field
		}
	}

	for key, val := range m {
377
378
379
380
381
		opt, ok := jsonOpts[key]
		if !ok {
			slog.Warn("invalid option provided", "option", opt.Name)
			continue
		}
Michael Yang's avatar
Michael Yang committed
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
		field := valueOpts.FieldByName(opt.Name)
		if field.IsValid() && field.CanSet() {
			if val == nil {
				continue
			}

			switch field.Kind() {
			case reflect.Int:
				switch t := val.(type) {
				case int64:
					field.SetInt(t)
				case float64:
					// when JSON unmarshals numbers, it uses float64, not int
					field.SetInt(int64(t))
				default:
					return fmt.Errorf("option %q must be of type integer", key)
				}
			case reflect.Bool:
				val, ok := val.(bool)
				if !ok {
					return fmt.Errorf("option %q must be of type boolean", key)
				}
				field.SetBool(val)
			case reflect.Float32:
				// JSON unmarshals to float64
				val, ok := val.(float64)
				if !ok {
					return fmt.Errorf("option %q must be of type float32", key)
				}
				field.SetFloat(val)
			case reflect.String:
				val, ok := val.(string)
				if !ok {
					return fmt.Errorf("option %q must be of type string", key)
				}
				field.SetString(val)
			case reflect.Slice:
				// JSON unmarshals to []interface{}, not []string
				val, ok := val.([]interface{})
				if !ok {
					return fmt.Errorf("option %q must be of type array", key)
				}
				// convert []interface{} to []string
				slice := make([]string, len(val))
				for i, item := range val {
					str, ok := item.(string)
429
					if !ok {
430
						return fmt.Errorf("option %q must be of an array of strings", key)
431
					}
432
					slice[i] = str
433
				}
434
435
436
				field.Set(reflect.ValueOf(slice))
			default:
				return fmt.Errorf("unknown type loading config params: %v", field.Kind())
437
438
439
			}
		}
	}
440

441
442
443
	return nil
}

444
445
// DefaultOptions is the default set of options for [GenerateRequest]; these
// values are used unless the user specifies other values explicitly.
Michael Yang's avatar
Michael Yang committed
446
447
func DefaultOptions() Options {
	return Options{
448
		// options set on request to runner
449
450
451
452
		NumPredict: -1,

		// set a minimal num_keep to avoid issues on context shifts
		NumKeep:          4,
Michael Yang's avatar
Michael Yang committed
453
454
455
456
457
		Temperature:      0.8,
		TopK:             40,
		TopP:             0.9,
		TFSZ:             1.0,
		TypicalP:         1.0,
458
459
460
461
		RepeatLastN:      64,
		RepeatPenalty:    1.1,
		PresencePenalty:  0.0,
		FrequencyPenalty: 0.0,
Michael Yang's avatar
Michael Yang committed
462
463
464
		Mirostat:         0,
		MirostatTau:      5.0,
		MirostatEta:      0.1,
Michael Yang's avatar
Michael Yang committed
465
		PenalizeNewline:  true,
466
		Seed:             -1,
Michael Yang's avatar
Michael Yang committed
467

468
469
		Runner: Runner{
			// options set when the model is loaded
Michael Yang's avatar
Michael Yang committed
470
471
472
			NumCtx:    2048,
			NumBatch:  512,
			NumGPU:    -1, // -1 here indicates that NumGPU should be set dynamically
473
			NumThread: 0,  // let the runtime decide
Michael Yang's avatar
Michael Yang committed
474
475
476
477
478
			LowVRAM:   false,
			F16KV:     true,
			UseMLock:  false,
			UseMMap:   true,
			UseNUMA:   false,
479
		},
Michael Yang's avatar
Michael Yang committed
480
	}
Jeffrey Morgan's avatar
Jeffrey Morgan committed
481
}
Michael Yang's avatar
Michael Yang committed
482
483
484
485
486

type Duration struct {
	time.Duration
}

487
488
489
490
491
492
493
func (d Duration) MarshalJSON() ([]byte, error) {
	if d.Duration < 0 {
		return []byte("-1"), nil
	}
	return []byte("\"" + d.Duration.String() + "\""), nil
}

Michael Yang's avatar
Michael Yang committed
494
495
496
497
498
499
500
501
502
503
504
func (d *Duration) UnmarshalJSON(b []byte) (err error) {
	var v any
	if err := json.Unmarshal(b, &v); err != nil {
		return err
	}

	d.Duration = 5 * time.Minute

	switch t := v.(type) {
	case float64:
		if t < 0 {
bnorick's avatar
bnorick committed
505
			d.Duration = time.Duration(math.MaxInt64)
506
		} else {
507
			d.Duration = time.Duration(int(t) * int(time.Second))
Michael Yang's avatar
Michael Yang committed
508
509
510
511
512
513
		}
	case string:
		d.Duration, err = time.ParseDuration(t)
		if err != nil {
			return err
		}
514
		if d.Duration < 0 {
bnorick's avatar
bnorick committed
515
			d.Duration = time.Duration(math.MaxInt64)
516
		}
517
518
	default:
		return fmt.Errorf("Unsupported type: '%s'", reflect.TypeOf(v))
Michael Yang's avatar
Michael Yang committed
519
520
521
522
	}

	return nil
}
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582

// FormatParams converts specified parameter options to their correct types
func FormatParams(params map[string][]string) (map[string]interface{}, error) {
	opts := Options{}
	valueOpts := reflect.ValueOf(&opts).Elem() // names of the fields in the options struct
	typeOpts := reflect.TypeOf(opts)           // types of the fields in the options struct

	// build map of json struct tags to their types
	jsonOpts := make(map[string]reflect.StructField)
	for _, field := range reflect.VisibleFields(typeOpts) {
		jsonTag := strings.Split(field.Tag.Get("json"), ",")[0]
		if jsonTag != "" {
			jsonOpts[jsonTag] = field
		}
	}

	out := make(map[string]interface{})
	// iterate params and set values based on json struct tags
	for key, vals := range params {
		if opt, ok := jsonOpts[key]; !ok {
			return nil, fmt.Errorf("unknown parameter '%s'", key)
		} else {
			field := valueOpts.FieldByName(opt.Name)
			if field.IsValid() && field.CanSet() {
				switch field.Kind() {
				case reflect.Float32:
					floatVal, err := strconv.ParseFloat(vals[0], 32)
					if err != nil {
						return nil, fmt.Errorf("invalid float value %s", vals)
					}

					out[key] = float32(floatVal)
				case reflect.Int:
					intVal, err := strconv.ParseInt(vals[0], 10, 64)
					if err != nil {
						return nil, fmt.Errorf("invalid int value %s", vals)
					}

					out[key] = intVal
				case reflect.Bool:
					boolVal, err := strconv.ParseBool(vals[0])
					if err != nil {
						return nil, fmt.Errorf("invalid bool value %s", vals)
					}

					out[key] = boolVal
				case reflect.String:
					out[key] = vals[0]
				case reflect.Slice:
					// TODO: only string slices are supported right now
					out[key] = vals
				default:
					return nil, fmt.Errorf("unknown type %s for %s", field.Kind(), key)
				}
			}
		}
	}

	return out, nil
}