Performance Tests: 2026 Terraform 1.12 vs. OpenTofu 1.0 for Multi-Cloud IaC Deployment

// benchmark_orchestrator.go
// Benchmarks Terraform 1.12 vs OpenTofu 1.0 for multi-cloud IaC deployments
// Compile: go build -o benchmark_orchestrator main.go
// Run: ./benchmark_orchestrator --iterations 100 --cloud aws,azure,gcp
package main

import (
    \"bufio\"
    \"context\"
    \"encoding/json\"
    \"flag\"
    \"fmt\"
    \"log\"
    \"os\"
    \"os/exec\"
    \"runtime\"
    \"strconv\"
    \"strings\"
    \"time\"
)

// BenchmarkConfig holds runtime configuration
type BenchmarkConfig struct {
    Iterations   int
    Clouds       []string
    TerraformBin string
    OpenTofuBin  string
    WorkDir      string
}

// BenchmarkResult stores metrics for a single run
type BenchmarkResult struct {
    Tool        string  `json:\"tool\"`
    Version     string  `json:\"version\"`
    Cloud       string  `json:\"cloud\"`
    PlanTimeMs  int64   `json:\"plan_time_ms\"`
    ApplyTimeMs int64   `json:\"apply_time_ms\"`
    MemoryMB    float64 `json:\"memory_mb\"`
    StateSizeMB float64 `json:\"state_size_mb\"`
    Timestamp   string  `json:\"timestamp\"`
}

func main() {
    // Parse CLI flags
    iterations := flag.Int(\"iterations\", 50, \"Number of benchmark iterations per tool/cloud\")
    clouds := flag.String(\"cloud\", \"aws,azure,gcp\", \"Comma-separated list of clouds to test\")
    terraformBin := flag.String(\"terraform-bin\", \"/usr/local/bin/terraform\", \"Path to Terraform binary\")
    opentofuBin := flag.String(\"opentofu-bin\", \"/usr/local/bin/tofu\", \"Path to OpenTofu binary\")
    workDir := flag.String(\"work-dir\", \"./bench-workdir\", \"Working directory for IaC configs\")
    flag.Parse()

    // Initialize config
    cfg := BenchmarkConfig{
        Iterations:   *iterations,
        Clouds:       strings.Split(*clouds, \",\"),
        TerraformBin: *terraformBin,
        OpenTofuBin:  *opentofuBin,
        WorkDir:      *workDir,
    }

    // Validate binaries exist
    if _, err := os.Stat(cfg.TerraformBin); os.IsNotExist(err) {
        log.Fatalf(\"Terraform binary not found at %s: %v\", cfg.TerraformBin, err)
    }
    if _, err := os.Stat(cfg.OpenTofuBin); os.IsNotExist(err) {
        log.Fatalf(\"OpenTofu binary not found at %s: %v\", cfg.OpenTofuBin, err)
    }

    // Create work dir if not exists
    if err := os.MkdirAll(cfg.WorkDir, 0755); err != nil {
        log.Fatalf(\"Failed to create work dir: %v\", err)
    }

    // Run benchmarks for each tool and cloud
    var results []BenchmarkResult
    for _, tool := range []string{\"terraform\", \"opentofu\"} {
        binPath := cfg.TerraformBin
        if tool == \"opentofu\" {
            binPath = cfg.OpenTofuBin
        }
        // Get tool version
        versionCmd := exec.Command(binPath, \"version\")
        versionOut, err := versionCmd.Output()
        if err != nil {
            log.Fatalf(\"Failed to get %s version: %v\", tool, err)
        }
        version := strings.TrimSpace(string(versionOut))

        for _, cloud := range cfg.Clouds {
            fmt.Printf(\"Running %s benchmarks for %s cloud...\\n\", tool, cloud)
            for i := 0; i < cfg.Iterations; i++ {
                // TODO: Implement plan/apply timing, memory collection, state size check
                // This is a simplified example; full implementation would use cgroups for memory tracking
                start := time.Now()
                planCmd := exec.Command(binPath, \"plan\", \"-var\", fmt.Sprintf(\"cloud=%s\", cloud), \"-out\", \"tfplan\")
                planCmd.Dir = cfg.WorkDir
                if err := planCmd.Run(); err != nil {
                    log.Printf(\"Plan failed for %s/%s iteration %d: %v\", tool, cloud, i, err)
                    continue
                }
                planTime := time.Since(start).Milliseconds()

                // Collect metrics (simplified)
                result := BenchmarkResult{
                    Tool:        tool,
                    Version:     version,
                    Cloud:       cloud,
                    PlanTimeMs:  planTime,
                    Timestamp:   time.Now().Format(time.RFC3339),
                }
                results = append(results, result)
            }
        }
    }

    // Write results to JSON
    resultsJSON, err := json.MarshalIndent(results, \"\", \"  \")
    if err != nil {
        log.Fatalf(\"Failed to marshal results: %v\", err)
    }
    if err := os.WriteFile(\"benchmark_results.json\", resultsJSON, 0644); err != nil {
        log.Fatalf(\"Failed to write results file: %v\", err)
    }
    fmt.Printf(\"Benchmarks complete. Results written to benchmark_results.json\\n\")
}

// main.tf
// Multi-cloud 1000-resource deployment compatible with Terraform 1.12 and OpenTofu 1.0
// Variables defined in variables.tf, outputs in outputs.tf

terraform {
  // Terraform 1.12 required version; OpenTofu 1.0 will ignore this if >=1.9
  required_version = \">= 1.9.0\"

  // Multi-cloud provider requirements
  required_providers {
    aws = {
      source  = \"hashicorp/aws\"
      version = \">= 5.0.0\"
    }
    azurerm = {
      source  = \"hashicorp/azurerm\"
      version = \">= 3.0.0\"
    }
    google = {
      source  = \"hashicorp/google\"
      version = \">= 5.0.0\"
    }
  }

  // State backend configuration (S3 for AWS, Blob for Azure, GCS for GCP)
  // Uncomment the backend for your primary cloud
  // backend \"s3\" { ... }
  // backend \"azurerm\" { ... }
  // backend \"gcs\" { ... }
}

// Variable validation for cloud selection
variable \"target_clouds\" {
  description = \"List of clouds to deploy to: aws, azure, gcp\"
  type        = list(string)
  default     = [\"aws\", \"azure\", \"gcp\"]
  validation {
    condition = alltrue([
      for cloud in var.target_clouds : contains([\"aws\", \"azure\", \"gcp\"], cloud)
    ])
    error_message = \"Target clouds must be aws, azure, or gcp.\"
  }
}

variable \"resource_count_per_cloud\" {
  description = \"Number of resources to deploy per cloud (total = count * 3)\"
  type        = number
  default     = 333 // 333 *3 = 999, plus 1 state resource = 1000 total
  validation {
    condition     = var.resource_count_per_cloud > 0 && var.resource_count_per_cloud <= 1000
    error_message = \"Resource count per cloud must be between 1 and 1000.\"
  }
}

// AWS Resources (example: S3 buckets, EC2 instances)
module \"aws_resources\" {
  count  = contains(var.target_clouds, \"aws\") ? 1 : 0
  source = \"./modules/aws\"

  resource_count = var.resource_count_per_cloud
  region         = \"us-east-1\"
}

// Azure Resources (example: Storage accounts, VMs)
module \"azure_resources\" {
  count  = contains(var.target_clouds, \"azure\") ? 1 : 0
  source = \"./modules/azure\"

  resource_count = var.resource_count_per_cloud
  location       = \"eastus\"
}

// GCP Resources (example: GCS buckets, Compute instances)
module \"gcp_resources\" {
  count  = contains(var.target_clouds, \"gcp\") ? 1 : 0
  source = \"./modules/gcp\"

  resource_count = var.resource_count_per_cloud
  project_id     = \"my-gcp-project\"
  region         = \"us-central1\"
}

// Output total resource count
output \"total_resources\" {
  value = (
    (contains(var.target_clouds, \"aws\") ? var.resource_count_per_cloud : 0) +
    (contains(var.target_clouds, \"azure\") ? var.resource_count_per_cloud : 0) +
    (contains(var.target_clouds, \"gcp\") ? var.resource_count_per_cloud : 0)
  )
  description = \"Total number of resources deployed across all clouds\"
}

# state_analyzer.py
#!/usr/bin/env python3
\"\"\"
Analyzes Terraform/OpenTofu state files to compare size, resource count, and performance.
Usage: python state_analyzer.py --state-file terraform.tfstate --tool terraform
\"\"\"
import argparse
import json
import os
import sys
from datetime import datetime
from typing import Dict, List, Any

class StateAnalyzer:
    def __init__(self, state_file: str, tool: str):
        self.state_file = state_file
        self.tool = tool
        self.state_data: Dict[str, Any] = {}
        self.resources: List[Dict[str, Any]] = []

    def load_state(self) -> None:
        \"\"\"Load and validate state file JSON.\"\"\"
        if not os.path.exists(self.state_file):
            raise FileNotFoundError(f\"State file not found: {self.state_file}\")
        if not self.state_file.endswith(\".tfstate\"):
            raise ValueError(\"State file must have .tfstate extension\")

        try:
            with open(self.state_file, \"r\") as f:
                self.state_data = json.load(f)
        except json.JSONDecodeError as e:
            raise ValueError(f\"Invalid JSON in state file: {e}\")

        # Extract resources (handle both Terraform v3 and OpenTofu v2 state formats)
        if \"resources\" in self.state_data:
            self.resources = self.state_data[\"resources\"]
        elif \"state\" in self.state_data and \"resources\" in self.state_data[\"state\"]:
            # Terraform 1.12 v3 state format
            self.resources = self.state_data[\"state\"][\"resources\"]
        else:
            raise KeyError(\"No resources found in state file\")

    def get_resource_count(self) -> int:
        \"\"\"Return total number of resources in state.\"\"\"
        return len(self.resources)

    def get_state_size_mb(self) -> float:
        \"\"\"Return state file size in MB.\"\"\"
        size_bytes = os.path.getsize(self.state_file)
        return size_bytes / (1024 * 1024)

    def get_provider_breakdown(self) -> Dict[str, int]:
        \"\"\"Return resource count per provider.\"\"\"
        provider_counts: Dict[str, int] = {}
        for resource in self.resources:
            provider = resource.get(\"provider\", \"unknown\")
            # Handle provider prefix (e.g., provider[\"registry.terraform.io/hashicorp/aws\"])
            if isinstance(provider, list):
                provider = provider[0].split(\"/\")[-1]
            provider_counts[provider] = provider_counts.get(provider, 0) + 1
        return provider_counts

    def generate_report(self) -> Dict[str, Any]:
        \"\"\"Generate full analysis report.\"\"\"
        return {
            \"tool\": self.tool,
            \"state_file\": self.state_file,
            \"resource_count\": self.get_resource_count(),
            \"state_size_mb\": round(self.get_state_size_mb(), 2),
            \"provider_breakdown\": self.get_provider_breakdown(),
            \"analysis_timestamp\": datetime.now().isoformat(),
        }

def main():
    parser = argparse.ArgumentParser(description=\"Analyze Terraform/OpenTofu state files\")
    parser.add_argument(\"--state-file\", required=True, help=\"Path to .tfstate file\")
    parser.add_argument(\"--tool\", choices=[\"terraform\", \"opentofu\"], required=True, help=\"Tool that generated the state\")
    parser.add_argument(\"--output-json\", help=\"Path to write JSON report\")
    args = parser.parse_args()

    try:
        analyzer = StateAnalyzer(args.state_file, args.tool)
        analyzer.load_state()
        report = analyzer.generate_report()

        # Print human-readable report
        print(f\"State Analysis Report for {args.tool}\")
        print(f\"State File: {args.state_file}\")
        print(f\"Total Resources: {report['resource_count']}\")
        print(f\"State Size: {report['state_size_mb']} MB\")
        print(\"Provider Breakdown:\")
        for provider, count in report[\"provider_breakdown\"].items():
            print(f\"  {provider}: {count}\")

        # Write JSON report if requested
        if args.output_json:
            with open(args.output_json, \"w\") as f:
                json.dump(report, f, indent=2)
            print(f\"JSON report written to {args.output_json}\")

    except Exception as e:
        print(f\"Error analyzing state file: {e}\", file=sys.stderr)
        sys.exit(1)

if __name__ == \"__main__\":
    main()

// Enable Terraform 1.12 v3 state engine (not supported by OpenTofu 1.0)
terraform {
  required_version = \">= 1.12.0\"
  state_engine = \"v3\" // New in Terraform 1.12
}

# GitHub Actions step to enable OpenTofu provider cache
- name: Setup OpenTofu Provider Cache
  uses: actions/cache@v4
  with:
    path: ~/.tofu/plugins
    key: tofu-plugins-${{ hashFiles('**/.tofu.lock.hcl') }}
    restore-keys: tofu-plugins-

- name: Run OpenTofu Plan
  run: tofu plan
  env:
    TOFU_PLUGIN_CACHE_DIR: ~/.tofu/plugins

# Makefile for hybrid Terraform/OpenTofu adoption
PLAN_TOOL ?= terraform

plan:
  @$(PLAN_TOOL) plan -out tfplan

apply:
  @$(PLAN_TOOL) apply tfplan

# Usage: make plan PLAN_TOOL=tofu (for OpenTofu)
# Usage: make plan (defaults to Terraform)