Gas profiling contract (#346)

* implemented the gas profilling contract

* implemented the gas profilling contract

Author: beebozy

contracts/Cargo.toml

@@ -16,4 +16,4 @@ strip = "symbols"
 debug-assertions = false
 panic = "abort"
 codegen-units = 1
-lto = true
+lto = true

contracts/subscription/Cargo.toml

@@ -10,6 +10,8 @@ name = "subtrackr_subscription"
 path = "src/lib.rs"
 crate-type = ["cdylib", "rlib"]
 
+serde = "1.0"
+
 [dependencies]
 soroban-sdk = "21.0.0"
 subtrackr-types = { path = "../types" }

contracts/subscription/src/gas_optimization.rs

@@ -0,0 +1,375 @@
+/// Gas Optimization and Targeting Module
+/// Provides optimization recommendations and tracks gas targets
+
+use soroban_sdk::{String, Vec, Env};
+
+/// Optimization level
+#[derive(Clone, Copy)]
+pub enum OptimizationLevel {
+    Critical, // > 150% of target
+    High,     // 100-150% of target
+    Medium,   // 80-100% of target
+    Optimal,  // < 80% of target
+}
+
+impl OptimizationLevel {
+    pub fn to_string(&self) -> &'static str {
+        match self {
+            Self::Critical => "critical",
+            Self::High => "high",
+            Self::Medium => "medium",
+            Self::Optimal => "optimal",
+        }
+    }
+}
+
+/// Optimization recommendation
+#[derive(Clone)]
+pub struct OptimizationRecommendation {
+    pub function_name: String,
+    pub severity: OptimizationLevel,
+    pub current_gas: u64,
+    pub target_gas: u64,
+    pub potential_savings: u64,
+    pub recommendation: String,
+}
+
+/// Gas optimization targets for each function
+pub struct GasOptimizationTargets;
+
+impl GasOptimizationTargets {
+    /// Get target gas for initialization functions
+    pub fn initialize_target() -> u64 {
+        25_000 // Minimal storage setup
+    }
+
+    /// Get target gas for plan creation
+    pub fn create_plan_target() -> u64 {
+        75_000 // Multiple storage writes
+    }
+
+    /// Get target gas for subscription
+    pub fn subscribe_target() -> u64 {
+        65_000 // Create subscription + index
+    }
+
+    /// Get target gas for charge operation
+    pub fn charge_subscription_target() -> u64 {
+        150_000 // Token transfer + storage updates
+    }
+
+    /// Get target gas for cancel subscription
+    pub fn cancel_subscription_target() -> u64 {
+        45_000 // Remove from indexes + decrement counts
+    }
+
+    /// Get target gas for pause subscription
+    pub fn pause_subscription_target() -> u64 {
+        35_000 // Single storage write
+    }
+
+    /// Get target gas for resume subscription
+    pub fn resume_subscription_target() -> u64 {
+        40_000 // Single storage write + time calculation
+    }
+
+    /// Get target gas for request refund
+    pub fn request_refund_target() -> u64 {
+        30_000 // Storage write + validation
+    }
+
+    /// Get target gas for approve refund
+    pub fn approve_refund_target() -> u64 {
+        35_000 // Storage write + transfer
+    }
+
+    /// Get target gas for request transfer
+    pub fn request_transfer_target() -> u64 {
+        25_000 // Storage write
+    }
+
+    /// Get target gas for accept transfer
+    pub fn accept_transfer_target() -> u64 {
+        85_000 // Multiple storage operations
+    }
+
+    /// Get target gas for plan query
+    pub fn get_plan_target() -> u64 {
+        15_000 // Read from storage
+    }
+
+    /// Get target gas for subscription query
+    pub fn get_subscription_target() -> u64 {
+        15_000 // Read from storage
+    }
+
+    /// Get target for user subscriptions query
+    pub fn get_user_subscriptions_target() -> u64 {
+        20_000 // Read + iteration
+    }
+
+    /// Get all targets as a map
+    pub fn all_targets(env: &Env) -> Vec<(String, u64)> {
+        soroban_sdk::vec![
+            env,
+            (String::from_str(env, "initialize"), Self::initialize_target()),
+            (String::from_str(env, "create_plan"), Self::create_plan_target()),
+            (String::from_str(env, "subscribe"), Self::subscribe_target()),
+            (String::from_str(env, "charge_subscription"), Self::charge_subscription_target()),
+            (String::from_str(env, "cancel_subscription"), Self::cancel_subscription_target()),
+            (String::from_str(env, "pause_subscription"), Self::pause_subscription_target()),
+            (String::from_str(env, "resume_subscription"), Self::resume_subscription_target()),
+            (String::from_str(env, "request_refund"), Self::request_refund_target()),
+            (String::from_str(env, "approve_refund"), Self::approve_refund_target()),
+            (String::from_str(env, "request_transfer"), Self::request_transfer_target()),
+            (String::from_str(env, "accept_transfer"), Self::accept_transfer_target()),
+            (String::from_str(env, "get_plan"), Self::get_plan_target()),
+            (String::from_str(env, "get_subscription"), Self::get_subscription_target()),
+            (String::from_str(env, "get_user_subscriptions"), Self::get_user_subscriptions_target()),
+        ]
+    }
+}
+
+/// Gas optimization strategies and recommendations
+pub struct GasOptimizations;
+
+impl GasOptimizations {
+    /// Get optimization recommendations for a specific function
+    pub fn get_recommendations_for_function(env: &Env, function_name: &str, current_gas: u64) -> Vec<String> {
+        let mut recommendations = Vec::new(env);
+
+        match function_name {
+            "create_plan" => {
+                if current_gas > 100_000 {
+                    recommendations.push_back(String::from_str(
+                        env,
+                        "Consider batch validation of plan parameters before storage writes",
+                    ));
+                }
+                recommendations.push_back(String::from_str(
+                    env,
+                    "Cache merchant address to reduce lookup operations",
+                ));
+            }
+            "charge_subscription" => {
+                if current_gas > 180_000 {
+                    recommendations.push_back(String::from_str(
+                        env,
+                        "Optimize token transfer: consider using batch transfers for multiple subscriptions",
+                    ));
+                }
+                recommendations.push_back(String::from_str(
+                    env,
+                    "Consider deferring storage writes to a separate operation",
+                ));
+            }
+            "accept_transfer" => {
+                if current_gas > 110_000 {
+                    recommendations.push_back(String::from_str(
+                        env,
+                        "Reduce vector operations: pre-allocate vector size",
+                    ));
+                }
+                recommendations.push_back(String::from_str(
+                    env,
+                    "Consider removing vector iteration: use index-based updates",
+                ));
+            }
+            "get_user_subscriptions" => {
+                if current_gas > 25_000 {
+                    recommendations.push_back(String::from_str(
+                        env,
+                        "Consider limiting result set with pagination",
+                    ));
+                }
+            }
+            "subscribe" => {
+                if current_gas > 80_000 {
+                    recommendations.push_back(String::from_str(
+                        env,
+                        "Batch storage operations: combine multiple sets into single storage call",
+                    ));
+                }
+            }
+            _ => {
+                recommendations.push_back(String::from_str(env, "Monitor function for optimization opportunities"));
+            }
+        }
+
+        recommendations
+    }
+
+    /// Get common optimization strategies
+    pub fn get_general_optimizations(env: &Env) -> Vec<String> {
+        let mut optimizations = Vec::new(env);
+
+        optimizations.push_back(String::from_str(
+            env,
+            "Use persistent instead of instance storage for rarely-accessed data",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Batch multiple storage operations into single contract calls",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Cache frequently accessed data in local variables",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Avoid unnecessary vector iterations when possible",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Pre-allocate vectors with expected capacity",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Use efficient data structures for lookups (indices/mappings)",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Minimize cross-contract calls: batch related operations",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Use event publishing instead of storage for audit trails",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Consider time-lock patterns for expensive operations",
+        ));
+        optimizations.push_back(String::from_str(
+            env,
+            "Monitor and break down complex functions into optimizable parts",
+        ));
+
+        optimizations
+    }
+
+    /// Categorize gas usage by severity
+    pub fn categorize_gas_usage(current_gas: u64, target_gas: u64) -> OptimizationLevel {
+        if current_gas > (target_gas * 150) / 100 {
+            OptimizationLevel::Critical
+        } else if current_gas > target_gas {
+            OptimizationLevel::High
+        } else if current_gas > (target_gas * 80) / 100 {
+            OptimizationLevel::Medium
+        } else {
+            OptimizationLevel::Optimal
+        }
+    }
+
+    /// Calculate potential gas savings
+    pub fn calculate_savings(current_gas: u64, target_gas: u64) -> u64 {
+        if current_gas > target_gas {
+            current_gas - target_gas
+        } else {
+            0
+        }
+    }
+}
+
+ pub fn get_optimization_priorities(
+    env: &Env,
+    gas_metrics: Vec<(String, u64)>,
+) -> Vec<(String, u64, String)> {
+    Vec::new(env)
+}
+
+/// Best practices for gas efficiency
+pub mod best_practices {
+    use soroban_sdk::{String, Vec, Env};
+
+    pub fn get_storage_best_practices(env: &Env) -> Vec<String> {
+        let mut practices = Vec::new(env);
+
+        practices.push_back(String::from_str(
+            env,
+            "Use instance storage for frequently accessed config, persistent for user data",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Minimize storage key complexity: use simple types when possible",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Batch related updates to reduce total storage operations",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Consider denormalization to reduce number of storage reads",
+        ));
+
+        practices
+    }
+
+    pub fn get_contract_interaction_best_practices(env: &Env) -> Vec<String> {
+        let mut practices = Vec::new(env);
+
+        practices.push_back(String::from_str(
+            env,
+            "Minimize cross-contract calls: combine operations when possible",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Cache contract client instances for repeated calls",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Batch token operations to reduce call count",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Use events for audit trails instead of storage",
+        ));
+
+        practices
+    }
+
+    pub fn get_computation_best_practices(env: &Env) -> Vec<String> {
+        let mut practices = Vec::new(env);
+
+        practices.push_back(String::from_str(
+            env,
+            "Avoid complex computations in hot paths",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Pre-compute complex values outside contract when possible",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Use efficient algorithms: O(n) preferred over O(n²)",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Short-circuit evaluations to exit early",
+        ));
+
+        practices
+    }
+
+    pub fn get_validation_best_practices(env: &Env) -> Vec<String> {
+        let mut practices = Vec::new(env);
+
+        practices.push_back(String::from_str(
+            env,
+            "Validate inputs early to fail fast",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Use assertions for critical validations",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Batch validation of related parameters",
+        ));
+        practices.push_back(String::from_str(
+            env,
+            "Cache validation results when applicable",
+        ));
+
+        practices
+    }
+}