Add method for determining prediction progress from logs (#13)

prediction.go

@@ -3,6 +3,8 @@ package replicate
 import (
 	"context"
 	"fmt"
+	"regexp"
+	"strings"
 )
 
 type Source string
@@ -32,6 +34,42 @@ type Prediction struct {
 	CompletedAt         *string            `json:"completed_at,omitempty"`
 }
 
+type PredictionProgress struct {
+	Percentage float64
+	Current    int
+	Total      int
+}
+
+func (p Prediction) Progress() *PredictionProgress {
+	if p.Logs == nil || *p.Logs == "" {
+		return nil
+	}
+
+	pattern := `^\s*(?P<percentage>\d+)%\s*\|.+?\|\s*(?P<current>\d+)\/(?P<total>\d+)`
+	re := regexp.MustCompile(pattern)
+
+	lines := strings.Split(*p.Logs, "\n")
+	for i := len(lines) - 1; i >= 0; i-- {
+		line := strings.TrimSpace(lines[i])
+		if re.MatchString(line) {
+			matches := re.FindStringSubmatch(lines[i])
+			if len(matches) == 4 {
+				var percentage, current, total int
+				fmt.Sscanf(matches[1], "%d", &percentage)
+				fmt.Sscanf(matches[2], "%d", &current)
+				fmt.Sscanf(matches[3], "%d", &total)
+				return &PredictionProgress{
+					Percentage: float64(percentage) / float64(100),
+					Current:    current,
+					Total:      total,
+				}
+			}
+		}
+	}
+
+	return nil
+}
+
 type PredictionInput map[string]interface{}
 type PredictionOutput interface{}
 

replicate_test.go

@@ -315,6 +315,80 @@ func TestCreatePrediction(t *testing.T) {
 	assert.Equal(t, "https://streaming.api.replicate.com/v1/predictions/ufawqhfynnddngldkgtslldrkq", prediction.URLs["stream"])
 }
 
+func TestPredictionProgress(t *testing.T) {
+	prediction := replicate.Prediction{
+		ID:        "ufawqhfynnddngldkgtslldrkq",
+		Version:   "5c7d5dc6dd8bf75c1acaa8565735e7986bc5b66206b55cca93cb72c9bf15ccaa",
+		Status:    "starting",
+		Input:     map[string]interface{}{"text": "Alice"},
+		Output:    nil,
+		Error:     nil,
+		Logs:      nil,
+		Metrics:   nil,
+		CreatedAt: "2022-04-26T22:13:06.224088Z",
+		URLs: map[string]string{
+			"get":    "https://api.replicate.com/v1/predictions/ufawqhfynnddngldkgtslldrkq",
+			"cancel": "https://api.replicate.com/v1/predictions/ufawqhfynnddngldkgtslldrkq/cancel",
+			"stream": "https://streaming.api.replicate.com/v1/predictions/ufawqhfynnddngldkgtslldrkq",
+		},
+	}
+
+	lines := []string{
+		"Using seed: 12345",
+		"0%|          | 0/5 [00:00<?, ?it/s]",
+		"20%|██        | 1/5 [00:00<00:01, 21.38it/s]",
+		"40%|████▍     | 2/5 [00:01<00:01, 22.46it/s]",
+		"60%|████▍     | 3/5 [00:01<00:01, 22.46it/s]",
+		"80%|████████  | 4/5 [00:01<00:00, 22.86it/s]",
+		"100%|██████████| 5/5 [00:02<00:00, 22.26it/s]",
+	}
+	logs := ""
+
+	for i, line := range lines {
+		logs = logs + "\n" + line
+		prediction.Logs = &logs
+
+		progress := prediction.Progress()
+
+		switch i {
+		case 0:
+			prediction.Status = replicate.Processing
+			assert.Nil(t, progress)
+		case 1:
+			assert.NotNil(t, progress)
+			assert.Equal(t, 0, progress.Current)
+			assert.Equal(t, 5, progress.Total)
+			assert.Equal(t, 0.0, progress.Percentage)
+		case 2:
+			assert.NotNil(t, progress)
+			assert.Equal(t, 1, progress.Current)
+			assert.Equal(t, 5, progress.Total)
+			assert.Equal(t, 0.2, progress.Percentage)
+		case 3:
+			assert.NotNil(t, progress)
+			assert.Equal(t, 2, progress.Current)
+			assert.Equal(t, 5, progress.Total)
+			assert.Equal(t, 0.4, progress.Percentage)
+		case 4:
+			assert.NotNil(t, progress)
+			assert.Equal(t, 3, progress.Current)
+			assert.Equal(t, 5, progress.Total)
+			assert.Equal(t, 0.6, progress.Percentage)
+		case 5:
+			assert.NotNil(t, progress)
+			assert.Equal(t, 4, progress.Current)
+			assert.Equal(t, 5, progress.Total)
+			assert.Equal(t, 0.8, progress.Percentage)
+		case 6:
+			assert.NotNil(t, progress)
+			prediction.Status = replicate.Succeeded
+			assert.Equal(t, 5, progress.Current)
+			assert.Equal(t, 5, progress.Total)
+			assert.Equal(t, 1.0, progress.Percentage)
+		}
+	}
+}
+
 func TestListPredictions(t *testing.T) {
 	mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		assert.Equal(t, "/predictions", r.URL.Path)