quantrs2_device/cloud/
provider_migration.rs

1//! Provider Migration Tools
2//!
3//! This module provides tools for migrating quantum workloads between different
4//! cloud providers with minimal disruption and optimized cost/performance.
5
6use super::{CloudProvider, ExecutionConfig, WorkloadSpec};
7use crate::{DeviceError, DeviceResult};
8use serde::{Deserialize, Serialize};
9use std::collections::HashMap;
10use std::time::Duration;
11
12/// Migration engine for cross-provider workload migration
13pub struct ProviderMigrationEngine {
14    config: MigrationConfig,
15    migration_strategies: Vec<Box<dyn MigrationStrategy + Send + Sync>>,
16    compatibility_checker: CompatibilityChecker,
17    cost_analyzer: MigrationCostAnalyzer,
18}
19
20/// Migration configuration
21#[derive(Debug, Clone, Serialize, Deserialize)]
22pub struct MigrationConfig {
23    pub enabled: bool,
24    pub migration_type: MigrationType,
25    pub rollback_enabled: bool,
26    pub validation_required: bool,
27    pub downtime_tolerance: Duration,
28    pub cost_threshold: f64,
29}
30
31/// Migration types
32#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
33pub enum MigrationType {
34    Hot,     // Live migration with no downtime
35    Warm,    // Brief downtime during cutover
36    Cold,    // Full stop and restart
37    Gradual, // Phased migration
38}
39
40/// Migration strategy trait
41pub trait MigrationStrategy {
42    fn migrate(&self, plan: &MigrationPlan) -> DeviceResult<MigrationResult>;
43    fn estimate_duration(&self, plan: &MigrationPlan) -> DeviceResult<Duration>;
44    fn get_strategy_name(&self) -> String;
45}
46
47/// Migration plan
48#[derive(Debug, Clone)]
49pub struct MigrationPlan {
50    pub migration_id: String,
51    pub source_provider: CloudProvider,
52    pub target_provider: CloudProvider,
53    pub workloads: Vec<WorkloadSpec>,
54    pub migration_phases: Vec<MigrationPhase>,
55    pub rollback_plan: RollbackPlan,
56}
57
58/// Migration phase
59#[derive(Debug, Clone)]
60pub struct MigrationPhase {
61    pub phase_id: String,
62    pub phase_name: String,
63    pub workloads: Vec<String>,
64    pub estimated_duration: Duration,
65    pub dependencies: Vec<String>,
66}
67
68/// Migration result
69#[derive(Debug, Clone)]
70pub struct MigrationResult {
71    pub migration_id: String,
72    pub success: bool,
73    pub migrated_workloads: Vec<String>,
74    pub failed_workloads: Vec<String>,
75    pub total_duration: Duration,
76    pub cost_impact: f64,
77}
78
79/// Rollback plan
80#[derive(Debug, Clone)]
81pub struct RollbackPlan {
82    pub rollback_triggers: Vec<String>,
83    pub rollback_steps: Vec<String>,
84    pub rollback_duration: Duration,
85    pub data_backup_required: bool,
86}
87
88/// Compatibility checker
89pub struct CompatibilityChecker {
90    provider_capabilities: HashMap<CloudProvider, ProviderCapabilities>,
91    compatibility_matrix: CompatibilityMatrix,
92}
93
94/// Provider capabilities
95#[derive(Debug, Clone)]
96pub struct ProviderCapabilities {
97    pub supported_algorithms: Vec<String>,
98    pub max_qubits: usize,
99    pub gate_set: Vec<String>,
100    pub connectivity: ConnectivityType,
101    pub api_compatibility: Vec<String>,
102}
103
104/// Connectivity types
105#[derive(Debug, Clone, PartialEq, Eq)]
106pub enum ConnectivityType {
107    Linear,
108    Grid,
109    AllToAll,
110    Custom(String),
111}
112
113/// Compatibility matrix
114pub struct CompatibilityMatrix {
115    matrix: HashMap<(CloudProvider, CloudProvider), CompatibilityScore>,
116}
117
118/// Compatibility score
119#[derive(Debug, Clone)]
120pub struct CompatibilityScore {
121    pub overall_score: f64,
122    pub algorithm_compatibility: f64,
123    pub hardware_compatibility: f64,
124    pub api_compatibility: f64,
125    pub blocking_issues: Vec<String>,
126}
127
128/// Migration cost analyzer
129pub struct MigrationCostAnalyzer {
130    cost_models: HashMap<CloudProvider, CostModel>,
131}
132
133/// Cost model for migration
134#[derive(Debug, Clone)]
135pub struct CostModel {
136    pub data_transfer_cost: f64,
137    pub downtime_cost: f64,
138    pub validation_cost: f64,
139    pub rollback_cost: f64,
140}
141
142impl ProviderMigrationEngine {
143    /// Create new migration engine
144    pub fn new(config: MigrationConfig) -> DeviceResult<Self> {
145        Ok(Self {
146            config,
147            migration_strategies: Vec::new(),
148            compatibility_checker: CompatibilityChecker::new()?,
149            cost_analyzer: MigrationCostAnalyzer::new()?,
150        })
151    }
152
153    /// Plan migration between providers
154    pub async fn plan_migration(
155        &self,
156        source: CloudProvider,
157        target: CloudProvider,
158        workloads: Vec<WorkloadSpec>,
159    ) -> DeviceResult<MigrationPlan> {
160        // Check compatibility
161        let compatibility = self
162            .compatibility_checker
163            .check_compatibility(source.clone(), target.clone())?;
164
165        if compatibility.overall_score < 0.7 {
166            return Err(DeviceError::InvalidInput(format!(
167                "Insufficient compatibility between {source:?} and {target:?}"
168            )));
169        }
170
171        // Generate migration phases
172        let phases = self.generate_migration_phases(&workloads)?;
173
174        Ok(MigrationPlan {
175            migration_id: uuid::Uuid::new_v4().to_string(),
176            source_provider: source,
177            target_provider: target,
178            workloads,
179            migration_phases: phases,
180            rollback_plan: RollbackPlan {
181                rollback_triggers: vec!["failure_rate > 0.1".to_string()],
182                rollback_steps: vec!["restore_source".to_string()],
183                rollback_duration: Duration::from_secs(1800),
184                data_backup_required: true,
185            },
186        })
187    }
188
189    /// Execute migration plan
190    pub async fn execute_migration(&self, plan: &MigrationPlan) -> DeviceResult<MigrationResult> {
191        for strategy in &self.migration_strategies {
192            if let Ok(result) = strategy.migrate(plan) {
193                return Ok(result);
194            }
195        }
196
197        Err(DeviceError::ExecutionFailed(
198            "No suitable migration strategy found".to_string(),
199        ))
200    }
201
202    /// Generate migration phases based on workload dependencies
203    fn generate_migration_phases(
204        &self,
205        workloads: &[WorkloadSpec],
206    ) -> DeviceResult<Vec<MigrationPhase>> {
207        // Simple implementation - migrate in order
208        let phases = workloads
209            .chunks(5)
210            .enumerate()
211            .map(|(i, chunk)| MigrationPhase {
212                phase_id: format!("phase_{i}"),
213                phase_name: format!("Migration Phase {}", i + 1),
214                workloads: chunk.iter().map(|w| w.workload_id.clone()).collect(),
215                estimated_duration: Duration::from_secs(600),
216                dependencies: if i > 0 {
217                    vec![format!("phase_{}", i - 1)]
218                } else {
219                    vec![]
220                },
221            })
222            .collect();
223
224        Ok(phases)
225    }
226}
227
228impl CompatibilityChecker {
229    fn new() -> DeviceResult<Self> {
230        Ok(Self {
231            provider_capabilities: HashMap::new(),
232            compatibility_matrix: CompatibilityMatrix {
233                matrix: HashMap::new(),
234            },
235        })
236    }
237
238    fn check_compatibility(
239        &self,
240        source: CloudProvider,
241        target: CloudProvider,
242    ) -> DeviceResult<CompatibilityScore> {
243        // Simplified compatibility check
244        let score = match (source, target) {
245            (CloudProvider::IBM, CloudProvider::AWS) => 0.8,
246            (CloudProvider::AWS, CloudProvider::Azure) => 0.75,
247            (CloudProvider::Azure, CloudProvider::Google) => 0.7,
248            _ => 0.6,
249        };
250
251        Ok(CompatibilityScore {
252            overall_score: score,
253            algorithm_compatibility: score,
254            hardware_compatibility: score * 0.9,
255            api_compatibility: score * 0.8,
256            blocking_issues: Vec::new(),
257        })
258    }
259}
260
261impl MigrationCostAnalyzer {
262    fn new() -> DeviceResult<Self> {
263        Ok(Self {
264            cost_models: HashMap::new(),
265        })
266    }
267}
268
269impl Default for MigrationConfig {
270    fn default() -> Self {
271        Self {
272            enabled: true,
273            migration_type: MigrationType::Warm,
274            rollback_enabled: true,
275            validation_required: true,
276            downtime_tolerance: Duration::from_secs(300),
277            cost_threshold: 1000.0,
278        }
279    }
280}
quantrs2_device/cloud/provider_migration.rs

quantrs2_device/cloud/
provider_migration.rs
