Signatures monthly report

Signed-off-by: Lukasz Gryglicki <[email protected]>

Assisted by [OpenAI](https://platform.openai.com/)

Assisted by [GitHub Copilot](https://github.com/features/copilot)

Author: lukaszgryglicki

cla-backend-go/monthly_signature_report.go

@@ -0,0 +1,322 @@
+// Copyright The Linux Foundation.
+// SPDX-License-Identifier: MIT
+
+package main
+
+import (
+	"encoding/csv"
+	"fmt"
+	"log"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/session"
+	"github.com/aws/aws-sdk-go/service/dynamodb"
+	"github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
+)
+
+const (
+	regionDefault = "us-east-1"
+	profileName   = "lfproduct-prod"
+	tableName     = "cla-prod-signatures"
+)
+
+// SignatureRecord represents the DynamoDB signature record structure
+type SignatureRecord struct {
+	SignatureID              string `dynamodbav:"signature_id"`
+	DateCreated              string `dynamodbav:"date_created"`
+	ApproxDateCreated        string `dynamodbav:"approx_date_created"`
+	SignatureType            string `dynamodbav:"signature_type"`
+	SigtypeSignedApprovedID  string `dynamodbav:"sigtype_signed_approved_id"`
+	SignatureApproved        bool   `dynamodbav:"signature_approved"`
+	SignatureSigned          bool   `dynamodbav:"signature_signed"`
+}
+
+// MonthlyStats holds the count of signatures per month
+type MonthlyStats struct {
+	Month string
+	ICLA  int
+	ECLA  int
+	CCLA  int
+}
+
+func main() {
+	// Set up AWS session
+	sess, err := session.NewSessionWithOptions(session.Options{
+		Profile: profileName,
+		Config: aws.Config{
+			Region: aws.String(regionDefault),
+		},
+	})
+	if err != nil {
+		log.Fatalf("Error creating AWS session: %v", err)
+	}
+
+	svc := dynamodb.New(sess)
+
+	fmt.Println("Scanning signatures table for ICLA, ECLA, and CCLA statistics...")
+
+	// Monthly counters map[YYYY-MM]Stats
+	monthlyStats := make(map[string]*MonthlyStats)
+
+	// Scan parameters
+	params := &dynamodb.ScanInput{
+		TableName: aws.String(tableName),
+	}
+
+	// Get current time for validation
+	now := time.Now()
+	currentMonth := now.Format("2006-01")
+
+	totalProcessed := 0
+	totalICLA := 0
+	totalECLA := 0
+	totalCCLA := 0
+	skippedInvalidDates := 0
+	skippedFutureDates := 0
+
+	// Scan the table
+	err = svc.ScanPages(params, func(page *dynamodb.ScanOutput, lastPage bool) bool {
+		for _, item := range page.Items {
+			var sig SignatureRecord
+			err := dynamodbattribute.UnmarshalMap(item, &sig)
+			if err != nil {
+				log.Printf("Error unmarshalling record: %v", err)
+				continue
+			}
+
+			totalProcessed++
+			if totalProcessed%1000 == 0 {
+				fmt.Printf("Processed %d records...\n", totalProcessed)
+			}
+
+			// Only process signatures that are signed and approved
+			if !sig.SignatureSigned || !sig.SignatureApproved {
+				continue
+			}
+
+			// Get the creation date (prefer date_created, fallback to approx_date_created)
+			creationDate := sig.DateCreated
+			if creationDate == "" {
+				creationDate = sig.ApproxDateCreated
+			}
+			if creationDate == "" {
+				continue
+			}
+
+			// Parse creation date to extract month
+			month := extractMonth(creationDate, currentMonth)
+			if month == "" {
+				skippedInvalidDates++
+				continue
+			}
+
+			// Check if month is in the future
+			if month > currentMonth {
+				skippedFutureDates++
+				continue
+			}
+
+			// Determine signature type based on multiple factors
+			var isICLA, isECLA, isCCLA bool
+			
+			// Primary method: check sigtype_signed_approved_id
+			if sig.SigtypeSignedApprovedID != "" {
+				if strings.HasPrefix(sig.SigtypeSignedApprovedID, "icla#") {
+					isICLA = true
+					totalICLA++
+				} else if strings.HasPrefix(sig.SigtypeSignedApprovedID, "ecla#") {
+					isECLA = true
+					totalECLA++
+				} else if strings.HasPrefix(sig.SigtypeSignedApprovedID, "ccla#") {
+					isCCLA = true
+					totalCCLA++
+				} else {
+					// Skip unknown types
+					continue
+				}
+			} else if sig.SignatureType != "" {
+				// Fallback method: check signature_type field
+				switch sig.SignatureType {
+				case "cla":
+					// For legacy CLA records without sigtype_signed_approved_id, treat as ICLA
+					isICLA = true
+					totalICLA++
+				case "ccla":
+					isCCLA = true
+					totalCCLA++
+				case "ecla":
+					isECLA = true
+					totalECLA++
+				default:
+					continue
+				}
+			} else {
+				// Skip records without type information
+				continue
+			}
+
+			// Initialize month stats if not exists
+			if monthlyStats[month] == nil {
+				monthlyStats[month] = &MonthlyStats{Month: month}
+			}
+
+			// Increment appropriate counter
+			if isICLA {
+				monthlyStats[month].ICLA++
+			} else if isECLA {
+				monthlyStats[month].ECLA++
+			} else if isCCLA {
+				monthlyStats[month].CCLA++
+			}
+		}
+		return true // Continue scanning
+	})
+
+	if err != nil {
+		log.Fatalf("Error scanning table: %v", err)
+	}
+
+	fmt.Printf("\nProcessing complete!\n")
+	fmt.Printf("Total records processed: %d\n", totalProcessed)
+	fmt.Printf("Total ICLA signatures: %d\n", totalICLA)
+	fmt.Printf("Total ECLA signatures: %d\n", totalECLA)
+	fmt.Printf("Total CCLA signatures: %d\n", totalCCLA)
+	fmt.Printf("Skipped invalid dates: %d\n", skippedInvalidDates)
+	fmt.Printf("Skipped future dates: %d\n", skippedFutureDates)
+
+	// Convert map to slice and sort by month
+	var monthlyData []MonthlyStats
+	for _, stats := range monthlyStats {
+		monthlyData = append(monthlyData, *stats)
+	}
+
+	sort.Slice(monthlyData, func(i, j int) bool {
+		return monthlyData[i].Month < monthlyData[j].Month
+	})
+
+	// Create CSV output
+	outputFile := "signature_monthly_report.csv"
+	file, err := os.Create(outputFile)
+	if err != nil {
+		log.Fatalf("Error creating output file: %v", err)
+	}
+	defer file.Close()
+
+	writer := csv.NewWriter(file)
+	defer writer.Flush()
+
+	// Set semicolon as separator
+	writer.Comma = ';'
+
+	// Write header
+	writer.Write([]string{"month", "ICLAs", "ECLAs", "CCLAs"})
+
+	// Write data
+	for _, stats := range monthlyData {
+		record := []string{
+			stats.Month,
+			strconv.Itoa(stats.ICLA),
+			strconv.Itoa(stats.ECLA),
+			strconv.Itoa(stats.CCLA),
+		}
+		writer.Write(record)
+	}
+
+	fmt.Printf("Report generated: %s\n", outputFile)
+	fmt.Printf("Total months with activity: %d\n", len(monthlyData))
+}
+
+// extractMonth extracts YYYY-MM from date_created field with proper validation
+func extractMonth(dateStr, currentMonth string) string {
+	if dateStr == "" {
+		return ""
+	}
+
+	// Handle different date formats
+	// 2021-08-09T15:21:56.492368+0000
+	// 2024-07-30T12:11:34Z
+	
+	var t time.Time
+	var err error
+
+	// Try parsing different formats
+	formats := []string{
+		"2006-01-02T15:04:05.999999+0000",
+		"2006-01-02T15:04:05Z",
+		"2006-01-02T15:04:05.999999Z",
+		"2006-01-02T15:04:05+0000",
+		"2006-01-02T15:04:05.999999-0700",
+		"2006-01-02T15:04:05-0700",
+		time.RFC3339,
+		time.RFC3339Nano,
+		"2006-01-02 15:04:05",
+		"2006-01-02",
+	}
+
+	for _, format := range formats {
+		t, err = time.Parse(format, dateStr)
+		if err == nil {
+			break
+		}
+	}
+
+	if err != nil {
+		// Try to extract just the date part
+		parts := strings.Split(dateStr, "T")
+		if len(parts) > 0 {
+			datePart := parts[0]
+			if len(datePart) >= 7 { // YYYY-MM format at minimum
+				// Try different date part lengths
+				for _, length := range []int{10, 7} { // YYYY-MM-DD or YYYY-MM
+					if len(datePart) >= length {
+						testDateStr := datePart[:length]
+						var testFormat string
+						if length == 10 {
+							testFormat = "2006-01-02"
+						} else {
+							testFormat = "2006-01"
+						}
+						
+						if testTime, testErr := time.Parse(testFormat, testDateStr); testErr == nil {
+							// Validate year and month ranges
+							year := testTime.Year()
+							month := int(testTime.Month())
+							
+							if year >= 2000 && year <= time.Now().Year() && 
+							   month >= 1 && month <= 12 {
+								return testTime.Format("2006-01")
+							}
+						}
+					}
+				}
+			}
+		}
+		return ""
+	}
+
+	// Validate the parsed time
+	year := t.Year()
+	month := int(t.Month())
+	
+	// Check for reasonable year and month ranges
+	if year < 2000 || year > time.Now().Year() || month < 1 || month > 12 {
+		return ""
+	}
+
+	result := t.Format("2006-01")
+	
+	// Additional validation: don't return invalid months like 2025-26
+	if testTime, testErr := time.Parse("2006-01", result); testErr == nil {
+		// Ensure the month is valid
+		if testTime.Month() >= 1 && testTime.Month() <= 12 {
+			return result
+		}
+	}
+	
+	return ""
+}