sklears_compose/
external_integration.rs

1//! External Tool Integration Framework
2//!
3//! This module provides a comprehensive framework for integrating external tools,
4//! services, and APIs into machine learning pipelines. It supports various
5//! integration patterns including REST APIs, message queues, databases, file systems,
6//! and custom integrations.
7
8use serde::{Deserialize, Serialize};
9use sklears_core::{
10    error::{Result as SklResult, SklearsError},
11    traits::Estimator,
12};
13use std::collections::{BTreeMap, HashMap};
14use std::fmt;
15use std::sync::Arc;
16use std::time::{Duration, Instant};
17
18/// External integration manager that handles connections to external tools
19#[derive(Debug, Clone)]
20pub struct ExternalIntegrationManager {
21    /// Registered integrations
22    integrations: HashMap<String, Arc<dyn ExternalIntegration + Send + Sync>>,
23    /// Configuration for each integration
24    configs: HashMap<String, IntegrationConfig>,
25    /// Retry policies
26    retry_policies: HashMap<String, RetryPolicy>,
27    /// Circuit breaker states
28    circuit_breakers: HashMap<String, CircuitBreakerState>,
29}
30
31/// Configuration for external integrations
32#[derive(Debug, Clone, Serialize, Deserialize)]
33pub struct IntegrationConfig {
34    /// Integration name
35    pub name: String,
36    /// Integration type
37    pub integration_type: IntegrationType,
38    /// Connection configuration
39    pub connection: ConnectionConfig,
40    /// Authentication configuration
41    pub auth: Option<AuthConfig>,
42    /// Timeout settings
43    pub timeout: TimeoutConfig,
44    /// Rate limiting
45    pub rate_limit: Option<RateLimitConfig>,
46    /// Health check configuration
47    pub health_check: HealthCheckConfig,
48}
49
50/// Types of external integrations
51#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
52pub enum IntegrationType {
53    /// REST API integration
54    RestApi,
55    /// GraphQL API integration
56    GraphQl,
57    /// Database integration
58    Database,
59    /// Message queue integration
60    MessageQueue,
61    /// File system integration
62    FileSystem,
63    /// Cloud storage integration
64    CloudStorage,
65    /// Container service integration
66    Container,
67    /// Serverless function integration
68    Serverless,
69    /// Custom integration
70    Custom(String),
71}
72
73/// Connection configuration for external services
74#[derive(Debug, Clone, Serialize, Deserialize)]
75pub struct ConnectionConfig {
76    /// Base URL or connection string
77    pub endpoint: String,
78    /// Connection pool size
79    pub pool_size: Option<usize>,
80    /// Keep-alive settings
81    pub keep_alive: bool,
82    /// TLS/SSL configuration
83    pub tls: Option<TlsConfig>,
84    /// Additional headers
85    pub headers: BTreeMap<String, String>,
86    /// Query parameters
87    pub query_params: BTreeMap<String, String>,
88}
89
90/// TLS/SSL configuration
91#[derive(Debug, Clone, Serialize, Deserialize)]
92pub struct TlsConfig {
93    /// Whether to verify certificates
94    pub verify_certificates: bool,
95    /// Custom CA certificate path
96    pub ca_cert_path: Option<String>,
97    /// Client certificate path
98    pub client_cert_path: Option<String>,
99    /// Client key path
100    pub client_key_path: Option<String>,
101}
102
103/// Authentication configuration
104#[derive(Debug, Clone, Serialize, Deserialize)]
105pub struct AuthConfig {
106    /// Authentication type
107    pub auth_type: AuthType,
108    /// Credentials or tokens
109    pub credentials: AuthCredentials,
110    /// Token refresh configuration
111    pub refresh: Option<RefreshConfig>,
112}
113
114/// Authentication types
115#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
116pub enum AuthType {
117    /// No authentication
118    None,
119    /// Basic authentication
120    Basic,
121    /// Bearer token
122    Bearer,
123    /// API key
124    ApiKey,
125    /// OAuth 2.0
126    OAuth2,
127    /// Custom authentication
128    Custom(String),
129}
130
131/// Authentication credentials
132#[derive(Debug, Clone, Serialize, Deserialize)]
133pub enum AuthCredentials {
134    /// Basic username/password
135    Basic { username: String, password: String },
136    /// Bearer token
137    Bearer { token: String },
138    /// API key
139    ApiKey { key: String, header: String },
140    /// OAuth 2.0 credentials
141    OAuth2 {
142        client_id: String,
143        client_secret: String,
144        access_token: Option<String>,
145        refresh_token: Option<String>,
146    },
147    /// Custom credentials
148    Custom(BTreeMap<String, String>),
149}
150
151/// Token refresh configuration
152#[derive(Debug, Clone, Serialize, Deserialize)]
153pub struct RefreshConfig {
154    /// Refresh endpoint
155    pub endpoint: String,
156    /// Refresh interval
157    pub interval: Duration,
158    /// Retry attempts
159    pub retry_attempts: usize,
160}
161
162/// Timeout configuration
163#[derive(Debug, Clone, Serialize, Deserialize)]
164pub struct TimeoutConfig {
165    /// Connection timeout
166    pub connect_timeout: Duration,
167    /// Request timeout
168    pub request_timeout: Duration,
169    /// Read timeout
170    pub read_timeout: Duration,
171}
172
173/// Rate limiting configuration
174#[derive(Debug, Clone, Serialize, Deserialize)]
175pub struct RateLimitConfig {
176    /// Requests per second
177    pub requests_per_second: f64,
178    /// Burst capacity
179    pub burst_capacity: usize,
180    /// Backoff strategy
181    pub backoff_strategy: BackoffStrategy,
182}
183
184/// Backoff strategies for rate limiting
185#[derive(Debug, Clone, Serialize, Deserialize)]
186pub enum BackoffStrategy {
187    /// Fixed delay
188    Fixed(Duration),
189    /// Exponential backoff
190    Exponential { initial: Duration, max: Duration },
191    /// Linear backoff
192    Linear {
193        initial: Duration,
194        increment: Duration,
195    },
196}
197
198/// Health check configuration
199#[derive(Debug, Clone, Serialize, Deserialize)]
200pub struct HealthCheckConfig {
201    /// Health check endpoint
202    pub endpoint: Option<String>,
203    /// Check interval
204    pub interval: Duration,
205    /// Timeout for health checks
206    pub timeout: Duration,
207    /// Number of consecutive failures before marking unhealthy
208    pub failure_threshold: usize,
209    /// Number of consecutive successes before marking healthy
210    pub success_threshold: usize,
211}
212
213/// Retry policy for failed operations
214#[derive(Debug, Clone, Serialize, Deserialize)]
215pub struct RetryPolicy {
216    /// Maximum number of retry attempts
217    pub max_attempts: usize,
218    /// Backoff strategy
219    pub backoff: BackoffStrategy,
220    /// Conditions that trigger retries
221    pub retry_conditions: Vec<RetryCondition>,
222}
223
224/// Conditions that determine whether to retry an operation
225#[derive(Debug, Clone, Serialize, Deserialize)]
226pub enum RetryCondition {
227    /// Retry on network errors
228    NetworkError,
229    /// Retry on timeout
230    Timeout,
231    /// Retry on specific status codes
232    StatusCode(Vec<u16>),
233    /// Retry on server errors (5xx)
234    ServerError,
235    /// Custom retry condition
236    Custom(String),
237}
238
239/// Circuit breaker state for fault tolerance
240#[derive(Debug, Clone)]
241pub struct CircuitBreakerState {
242    /// Current state
243    state: CircuitState,
244    /// Failure count
245    failure_count: usize,
246    /// Last failure time
247    last_failure: Option<Instant>,
248    /// Configuration
249    config: CircuitBreakerConfig,
250}
251
252/// Circuit breaker states
253#[derive(Debug, Clone, PartialEq, Eq)]
254pub enum CircuitState {
255    /// Circuit is closed (normal operation)
256    Closed,
257    /// Circuit is open (blocking requests)
258    Open,
259    /// Circuit is half-open (testing recovery)
260    HalfOpen,
261}
262
263/// Circuit breaker configuration
264#[derive(Debug, Clone, Serialize, Deserialize)]
265pub struct CircuitBreakerConfig {
266    /// Failure threshold before opening circuit
267    pub failure_threshold: usize,
268    /// Reset timeout for trying to close circuit
269    pub reset_timeout: Duration,
270    /// Success threshold for closing circuit from half-open
271    pub success_threshold: usize,
272}
273
274/// External integration trait that all integrations must implement
275pub trait ExternalIntegration: fmt::Debug {
276    /// Initialize the integration
277    fn initialize(&mut self, config: &IntegrationConfig) -> SklResult<()>;
278
279    /// Check if the integration is healthy
280    fn health_check(&self) -> SklResult<HealthStatus>;
281
282    /// Send data to the external service
283    fn send_data(&self, data: &IntegrationData) -> SklResult<IntegrationResponse>;
284
285    /// Receive data from the external service
286    fn receive_data(&self, request: &IntegrationRequest) -> SklResult<IntegrationData>;
287
288    /// Execute a custom operation
289    fn execute_operation(&self, operation: &Operation) -> SklResult<OperationResult>;
290
291    /// Clean up resources
292    fn cleanup(&mut self) -> SklResult<()>;
293}
294
295/// Health status of an integration
296#[derive(Debug, Clone)]
297pub struct HealthStatus {
298    /// Whether the service is healthy
299    pub is_healthy: bool,
300    /// Response time
301    pub response_time: Duration,
302    /// Last check time
303    pub last_check: Instant,
304    /// Error message if unhealthy
305    pub error_message: Option<String>,
306    /// Additional metadata
307    pub metadata: BTreeMap<String, String>,
308}
309
310/// Data format for integration communication
311#[derive(Debug, Clone, Serialize, Deserialize)]
312pub struct IntegrationData {
313    /// Data type identifier
314    pub data_type: String,
315    /// Serialized data payload
316    pub payload: Vec<u8>,
317    /// Metadata about the data
318    pub metadata: BTreeMap<String, String>,
319    /// Content type
320    pub content_type: String,
321    /// Encoding information
322    pub encoding: Option<String>,
323}
324
325/// Request format for external services
326#[derive(Debug, Clone, Serialize, Deserialize)]
327pub struct IntegrationRequest {
328    /// Request type
329    pub request_type: String,
330    /// Request parameters
331    pub parameters: BTreeMap<String, String>,
332    /// Request body
333    pub body: Option<Vec<u8>>,
334    /// Headers
335    pub headers: BTreeMap<String, String>,
336}
337
338/// Response from external services
339#[derive(Debug, Clone, Serialize, Deserialize)]
340pub struct IntegrationResponse {
341    /// Success status
342    pub success: bool,
343    /// Status code
344    pub status_code: Option<u16>,
345    /// Response body
346    pub body: Option<Vec<u8>>,
347    /// Response headers
348    pub headers: BTreeMap<String, String>,
349    /// Error message if failed
350    pub error: Option<String>,
351    /// Response time
352    pub response_time: Duration,
353}
354
355/// Generic operation for external services
356#[derive(Debug, Clone, Serialize, Deserialize)]
357pub struct Operation {
358    /// Operation type
359    pub operation_type: String,
360    /// Operation parameters
361    pub parameters: BTreeMap<String, serde_json::Value>,
362    /// Input data
363    pub input: Option<IntegrationData>,
364    /// Operation metadata
365    pub metadata: BTreeMap<String, String>,
366}
367
368/// Result of an operation
369#[derive(Debug, Clone, Serialize, Deserialize)]
370pub struct OperationResult {
371    /// Success status
372    pub success: bool,
373    /// Result data
374    pub result: Option<IntegrationData>,
375    /// Error message if failed
376    pub error: Option<String>,
377    /// Execution time
378    pub execution_time: Duration,
379    /// Additional metadata
380    pub metadata: BTreeMap<String, String>,
381}
382
383impl ExternalIntegrationManager {
384    /// Create a new integration manager
385    #[must_use]
386    pub fn new() -> Self {
387        Self {
388            integrations: HashMap::new(),
389            configs: HashMap::new(),
390            retry_policies: HashMap::new(),
391            circuit_breakers: HashMap::new(),
392        }
393    }
394
395    /// Register an external integration
396    pub fn register_integration(
397        &mut self,
398        name: &str,
399        integration: Arc<dyn ExternalIntegration + Send + Sync>,
400        config: IntegrationConfig,
401    ) -> SklResult<()> {
402        // Initialize circuit breaker
403        let circuit_breaker = CircuitBreakerState {
404            state: CircuitState::Closed,
405            failure_count: 0,
406            last_failure: None,
407            config: CircuitBreakerConfig {
408                failure_threshold: 5,
409                reset_timeout: Duration::from_secs(60),
410                success_threshold: 3,
411            },
412        };
413
414        // Default retry policy
415        let retry_policy = RetryPolicy {
416            max_attempts: 3,
417            backoff: BackoffStrategy::Exponential {
418                initial: Duration::from_millis(100),
419                max: Duration::from_secs(30),
420            },
421            retry_conditions: vec![
422                RetryCondition::NetworkError,
423                RetryCondition::Timeout,
424                RetryCondition::ServerError,
425            ],
426        };
427
428        self.integrations.insert(name.to_string(), integration);
429        self.configs.insert(name.to_string(), config);
430        self.retry_policies.insert(name.to_string(), retry_policy);
431        self.circuit_breakers
432            .insert(name.to_string(), circuit_breaker);
433
434        Ok(())
435    }
436
437    /// Get an integration by name
438    #[must_use]
439    pub fn get_integration(
440        &self,
441        name: &str,
442    ) -> Option<&Arc<dyn ExternalIntegration + Send + Sync>> {
443        self.integrations.get(name)
444    }
445
446    /// Send data through an integration with fault tolerance
447    pub fn send_data(
448        &mut self,
449        integration_name: &str,
450        data: &IntegrationData,
451    ) -> SklResult<IntegrationResponse> {
452        // Check circuit breaker first
453        if !self.is_circuit_closed(integration_name) {
454            return Err(SklearsError::InvalidOperation(format!(
455                "Circuit breaker is open for integration '{integration_name}'"
456            )));
457        }
458
459        // Clone the integration to avoid borrow checker issues
460        let integration = self
461            .integrations
462            .get(integration_name)
463            .ok_or_else(|| {
464                SklearsError::InvalidInput(format!("Integration '{integration_name}' not found"))
465            })?
466            .clone();
467
468        // Execute with retry logic
469        self.execute_with_retry(integration_name, || integration.send_data(data))
470    }
471
472    /// Receive data through an integration with fault tolerance
473    pub fn receive_data(
474        &mut self,
475        integration_name: &str,
476        request: &IntegrationRequest,
477    ) -> SklResult<IntegrationData> {
478        // Check circuit breaker first
479        if !self.is_circuit_closed(integration_name) {
480            return Err(SklearsError::InvalidOperation(format!(
481                "Circuit breaker is open for integration '{integration_name}'"
482            )));
483        }
484
485        // Clone the integration to avoid borrow checker issues
486        let integration = self
487            .integrations
488            .get(integration_name)
489            .ok_or_else(|| {
490                SklearsError::InvalidInput(format!("Integration '{integration_name}' not found"))
491            })?
492            .clone();
493
494        // Execute with retry logic
495        self.execute_with_retry(integration_name, || integration.receive_data(request))
496    }
497
498    /// Execute an operation through an integration
499    pub fn execute_operation(
500        &mut self,
501        integration_name: &str,
502        operation: &Operation,
503    ) -> SklResult<OperationResult> {
504        // Check circuit breaker first
505        if !self.is_circuit_closed(integration_name) {
506            return Err(SklearsError::InvalidOperation(format!(
507                "Circuit breaker is open for integration '{integration_name}'"
508            )));
509        }
510
511        // Clone the integration to avoid borrow checker issues
512        let integration = self
513            .integrations
514            .get(integration_name)
515            .ok_or_else(|| {
516                SklearsError::InvalidInput(format!("Integration '{integration_name}' not found"))
517            })?
518            .clone();
519
520        // Execute with retry logic
521        self.execute_with_retry(integration_name, || {
522            integration.execute_operation(operation)
523        })
524    }
525
526    /// Check health of all integrations
527    #[must_use]
528    pub fn health_check_all(&self) -> HashMap<String, HealthStatus> {
529        let mut results = HashMap::new();
530
531        for (name, integration) in &self.integrations {
532            match integration.health_check() {
533                Ok(status) => {
534                    results.insert(name.clone(), status);
535                }
536                Err(e) => {
537                    results.insert(
538                        name.clone(),
539                        HealthStatus {
540                            is_healthy: false,
541                            response_time: Duration::from_secs(0),
542                            last_check: Instant::now(),
543                            error_message: Some(e.to_string()),
544                            metadata: BTreeMap::new(),
545                        },
546                    );
547                }
548            }
549        }
550
551        results
552    }
553
554    /// Execute with retry logic
555    fn execute_with_retry<T, F>(&mut self, integration_name: &str, mut operation: F) -> SklResult<T>
556    where
557        F: FnMut() -> SklResult<T>,
558    {
559        let retry_policy = self
560            .retry_policies
561            .get(integration_name)
562            .cloned()
563            .unwrap_or_else(|| RetryPolicy {
564                max_attempts: 1,
565                backoff: BackoffStrategy::Fixed(Duration::from_millis(100)),
566                retry_conditions: vec![],
567            });
568
569        let mut attempts = 0;
570        let mut last_error = None;
571
572        while attempts < retry_policy.max_attempts {
573            match operation() {
574                Ok(result) => {
575                    // Record success for circuit breaker
576                    self.record_success(integration_name);
577                    return Ok(result);
578                }
579                Err(e) => {
580                    attempts += 1;
581                    last_error = Some(e.clone());
582
583                    // Record failure for circuit breaker
584                    self.record_failure(integration_name);
585
586                    // Check if we should retry
587                    if attempts < retry_policy.max_attempts
588                        && self.should_retry(&e, &retry_policy.retry_conditions)
589                    {
590                        // Apply backoff
591                        let delay = self.calculate_backoff(&retry_policy.backoff, attempts);
592                        std::thread::sleep(delay);
593                    } else {
594                        break;
595                    }
596                }
597            }
598        }
599
600        Err(last_error.unwrap_or_else(|| {
601            SklearsError::InvalidOperation("Operation failed without error details".to_string())
602        }))
603    }
604
605    /// Check if circuit breaker is closed
606    fn is_circuit_closed(&mut self, integration_name: &str) -> bool {
607        if let Some(circuit_breaker) = self.circuit_breakers.get_mut(integration_name) {
608            match circuit_breaker.state {
609                CircuitState::Closed => true,
610                CircuitState::Open => {
611                    // Check if we should transition to half-open
612                    if let Some(last_failure) = circuit_breaker.last_failure {
613                        if last_failure.elapsed() >= circuit_breaker.config.reset_timeout {
614                            circuit_breaker.state = CircuitState::HalfOpen;
615                            return true;
616                        }
617                    }
618                    false
619                }
620                CircuitState::HalfOpen => true,
621            }
622        } else {
623            true // No circuit breaker configured
624        }
625    }
626
627    /// Record a successful operation
628    fn record_success(&mut self, integration_name: &str) {
629        if let Some(circuit_breaker) = self.circuit_breakers.get_mut(integration_name) {
630            match circuit_breaker.state {
631                CircuitState::HalfOpen => {
632                    circuit_breaker.failure_count = 0;
633                    circuit_breaker.state = CircuitState::Closed;
634                }
635                CircuitState::Closed => {
636                    circuit_breaker.failure_count = 0;
637                }
638                CircuitState::Open => {
639                    // Should not happen
640                }
641            }
642        }
643    }
644
645    /// Record a failed operation
646    fn record_failure(&mut self, integration_name: &str) {
647        if let Some(circuit_breaker) = self.circuit_breakers.get_mut(integration_name) {
648            circuit_breaker.failure_count += 1;
649            circuit_breaker.last_failure = Some(Instant::now());
650
651            if circuit_breaker.failure_count >= circuit_breaker.config.failure_threshold {
652                circuit_breaker.state = CircuitState::Open;
653            }
654        }
655    }
656
657    /// Check if an error should trigger a retry
658    fn should_retry(&self, error: &SklearsError, conditions: &[RetryCondition]) -> bool {
659        for condition in conditions {
660            match condition {
661                RetryCondition::NetworkError => {
662                    // Check if it's a network-related error
663                    if error.to_string().contains("network")
664                        || error.to_string().contains("connection")
665                    {
666                        return true;
667                    }
668                }
669                RetryCondition::Timeout => {
670                    if error.to_string().contains("timeout") {
671                        return true;
672                    }
673                }
674                RetryCondition::ServerError => {
675                    if error.to_string().contains("server error") || error.to_string().contains('5')
676                    {
677                        return true;
678                    }
679                }
680                RetryCondition::StatusCode(_codes) => {
681                    // Would need to parse status code from error
682                    // Implementation depends on error format
683                }
684                RetryCondition::Custom(_) => {
685                    // Custom retry logic would be implemented here
686                }
687            }
688        }
689        false
690    }
691
692    /// Calculate backoff delay
693    fn calculate_backoff(&self, strategy: &BackoffStrategy, attempt: usize) -> Duration {
694        match strategy {
695            BackoffStrategy::Fixed(duration) => *duration,
696            BackoffStrategy::Exponential { initial, max } => {
697                let delay = initial.as_millis() * (2_u128.pow(attempt as u32 - 1));
698                Duration::from_millis(delay.min(max.as_millis()) as u64)
699            }
700            BackoffStrategy::Linear { initial, increment } => {
701                *initial + *increment * (attempt as u32 - 1)
702            }
703        }
704    }
705}
706
707/// REST API integration implementation
708#[derive(Debug)]
709pub struct RestApiIntegration {
710    config: Option<IntegrationConfig>,
711    base_url: String,
712}
713
714impl RestApiIntegration {
715    /// Create a new REST API integration
716    #[must_use]
717    pub fn new(base_url: String) -> Self {
718        Self {
719            config: None,
720            base_url,
721        }
722    }
723}
724
725impl ExternalIntegration for RestApiIntegration {
726    fn initialize(&mut self, config: &IntegrationConfig) -> SklResult<()> {
727        self.config = Some(config.clone());
728        self.base_url = config.connection.endpoint.clone();
729        Ok(())
730    }
731
732    fn health_check(&self) -> SklResult<HealthStatus> {
733        let start_time = Instant::now();
734
735        // Simulate health check
736        let is_healthy = true; // Would make actual HTTP request
737
738        Ok(HealthStatus {
739            is_healthy,
740            response_time: start_time.elapsed(),
741            last_check: Instant::now(),
742            error_message: None,
743            metadata: BTreeMap::from([
744                ("endpoint".to_string(), self.base_url.clone()),
745                ("integration_type".to_string(), "REST API".to_string()),
746            ]),
747        })
748    }
749
750    fn send_data(&self, data: &IntegrationData) -> SklResult<IntegrationResponse> {
751        let start_time = Instant::now();
752
753        // Simulate sending HTTP request
754        // In real implementation, would use HTTP client like reqwest
755
756        Ok(IntegrationResponse {
757            success: true,
758            status_code: Some(200),
759            body: Some(b"Success".to_vec()),
760            headers: BTreeMap::from([("Content-Type".to_string(), "application/json".to_string())]),
761            error: None,
762            response_time: start_time.elapsed(),
763        })
764    }
765
766    fn receive_data(&self, request: &IntegrationRequest) -> SklResult<IntegrationData> {
767        // Simulate receiving HTTP response
768        // In real implementation, would make actual HTTP request
769
770        Ok(IntegrationData {
771            data_type: "json".to_string(),
772            payload: b"{}".to_vec(),
773            metadata: BTreeMap::from([("source".to_string(), "REST API".to_string())]),
774            content_type: "application/json".to_string(),
775            encoding: Some("utf-8".to_string()),
776        })
777    }
778
779    fn execute_operation(&self, operation: &Operation) -> SklResult<OperationResult> {
780        let start_time = Instant::now();
781
782        // Simulate operation execution
783        // Would implement actual REST API calls based on operation type
784
785        Ok(OperationResult {
786            success: true,
787            result: Some(IntegrationData {
788                data_type: "operation_result".to_string(),
789                payload: b"{}".to_vec(),
790                metadata: BTreeMap::new(),
791                content_type: "application/json".to_string(),
792                encoding: Some("utf-8".to_string()),
793            }),
794            error: None,
795            execution_time: start_time.elapsed(),
796            metadata: BTreeMap::from([(
797                "operation_type".to_string(),
798                operation.operation_type.clone(),
799            )]),
800        })
801    }
802
803    fn cleanup(&mut self) -> SklResult<()> {
804        // Clean up HTTP connections, etc.
805        Ok(())
806    }
807}
808
809/// Database integration implementation
810#[derive(Debug)]
811pub struct DatabaseIntegration {
812    config: Option<IntegrationConfig>,
813    connection_string: String,
814}
815
816impl DatabaseIntegration {
817    /// Create a new database integration
818    #[must_use]
819    pub fn new(connection_string: String) -> Self {
820        Self {
821            config: None,
822            connection_string,
823        }
824    }
825}
826
827impl ExternalIntegration for DatabaseIntegration {
828    fn initialize(&mut self, config: &IntegrationConfig) -> SklResult<()> {
829        self.config = Some(config.clone());
830        self.connection_string = config.connection.endpoint.clone();
831        Ok(())
832    }
833
834    fn health_check(&self) -> SklResult<HealthStatus> {
835        let start_time = Instant::now();
836
837        // Simulate database ping
838        let is_healthy = true; // Would test actual database connection
839
840        Ok(HealthStatus {
841            is_healthy,
842            response_time: start_time.elapsed(),
843            last_check: Instant::now(),
844            error_message: None,
845            metadata: BTreeMap::from([
846                (
847                    "connection_string".to_string(),
848                    self.connection_string.clone(),
849                ),
850                ("integration_type".to_string(), "Database".to_string()),
851            ]),
852        })
853    }
854
855    fn send_data(&self, data: &IntegrationData) -> SklResult<IntegrationResponse> {
856        let start_time = Instant::now();
857
858        // Simulate database insert/update
859
860        Ok(IntegrationResponse {
861            success: true,
862            status_code: None,
863            body: None,
864            headers: BTreeMap::new(),
865            error: None,
866            response_time: start_time.elapsed(),
867        })
868    }
869
870    fn receive_data(&self, request: &IntegrationRequest) -> SklResult<IntegrationData> {
871        // Simulate database query
872
873        Ok(IntegrationData {
874            data_type: "sql_result".to_string(),
875            payload: b"[]".to_vec(),
876            metadata: BTreeMap::from([("source".to_string(), "Database".to_string())]),
877            content_type: "application/json".to_string(),
878            encoding: Some("utf-8".to_string()),
879        })
880    }
881
882    fn execute_operation(&self, operation: &Operation) -> SklResult<OperationResult> {
883        let start_time = Instant::now();
884
885        // Execute database operation based on operation type
886
887        Ok(OperationResult {
888            success: true,
889            result: None,
890            error: None,
891            execution_time: start_time.elapsed(),
892            metadata: BTreeMap::from([(
893                "operation_type".to_string(),
894                operation.operation_type.clone(),
895            )]),
896        })
897    }
898
899    fn cleanup(&mut self) -> SklResult<()> {
900        // Close database connections
901        Ok(())
902    }
903}
904
905impl Default for ExternalIntegrationManager {
906    fn default() -> Self {
907        Self::new()
908    }
909}
910
911impl Default for TimeoutConfig {
912    fn default() -> Self {
913        Self {
914            connect_timeout: Duration::from_secs(10),
915            request_timeout: Duration::from_secs(30),
916            read_timeout: Duration::from_secs(30),
917        }
918    }
919}
920
921impl Default for HealthCheckConfig {
922    fn default() -> Self {
923        Self {
924            endpoint: None,
925            interval: Duration::from_secs(30),
926            timeout: Duration::from_secs(5),
927            failure_threshold: 3,
928            success_threshold: 2,
929        }
930    }
931}
932
933#[allow(non_snake_case)]
934#[cfg(test)]
935mod tests {
936    use super::*;
937    use std::sync::Arc;
938
939    #[test]
940    fn test_integration_manager_creation() {
941        let manager = ExternalIntegrationManager::new();
942        assert!(manager.integrations.is_empty());
943        assert!(manager.configs.is_empty());
944    }
945
946    #[test]
947    fn test_rest_api_integration() {
948        let mut integration = RestApiIntegration::new("https://api.example.com".to_string());
949
950        let config = IntegrationConfig {
951            name: "test_api".to_string(),
952            integration_type: IntegrationType::RestApi,
953            connection: ConnectionConfig {
954                endpoint: "https://api.example.com".to_string(),
955                pool_size: Some(10),
956                keep_alive: true,
957                tls: None,
958                headers: BTreeMap::new(),
959                query_params: BTreeMap::new(),
960            },
961            auth: None,
962            timeout: TimeoutConfig::default(),
963            rate_limit: None,
964            health_check: HealthCheckConfig::default(),
965        };
966
967        assert!(integration.initialize(&config).is_ok());
968        assert!(integration.health_check().is_ok());
969    }
970
971    #[test]
972    fn test_database_integration() {
973        let mut integration =
974            DatabaseIntegration::new("postgresql://localhost:5432/test".to_string());
975
976        let config = IntegrationConfig {
977            name: "test_db".to_string(),
978            integration_type: IntegrationType::Database,
979            connection: ConnectionConfig {
980                endpoint: "postgresql://localhost:5432/test".to_string(),
981                pool_size: Some(5),
982                keep_alive: true,
983                tls: None,
984                headers: BTreeMap::new(),
985                query_params: BTreeMap::new(),
986            },
987            auth: None,
988            timeout: TimeoutConfig::default(),
989            rate_limit: None,
990            health_check: HealthCheckConfig::default(),
991        };
992
993        assert!(integration.initialize(&config).is_ok());
994        assert!(integration.health_check().is_ok());
995    }
996
997    #[test]
998    fn test_integration_manager_registration() {
999        let mut manager = ExternalIntegrationManager::new();
1000        let integration = Arc::new(RestApiIntegration::new(
1001            "https://api.example.com".to_string(),
1002        ));
1003
1004        let config = IntegrationConfig {
1005            name: "test_api".to_string(),
1006            integration_type: IntegrationType::RestApi,
1007            connection: ConnectionConfig {
1008                endpoint: "https://api.example.com".to_string(),
1009                pool_size: Some(10),
1010                keep_alive: true,
1011                tls: None,
1012                headers: BTreeMap::new(),
1013                query_params: BTreeMap::new(),
1014            },
1015            auth: None,
1016            timeout: TimeoutConfig::default(),
1017            rate_limit: None,
1018            health_check: HealthCheckConfig::default(),
1019        };
1020
1021        assert!(manager
1022            .register_integration("test_api", integration, config)
1023            .is_ok());
1024        assert!(manager.get_integration("test_api").is_some());
1025    }
1026
1027    #[test]
1028    fn test_circuit_breaker() {
1029        let circuit_breaker = CircuitBreakerState {
1030            state: CircuitState::Closed,
1031            failure_count: 0,
1032            last_failure: None,
1033            config: CircuitBreakerConfig {
1034                failure_threshold: 3,
1035                reset_timeout: Duration::from_secs(60),
1036                success_threshold: 2,
1037            },
1038        };
1039
1040        assert_eq!(circuit_breaker.state, CircuitState::Closed);
1041        assert_eq!(circuit_breaker.failure_count, 0);
1042    }
1043
1044    #[test]
1045    fn test_retry_policy() {
1046        let retry_policy = RetryPolicy {
1047            max_attempts: 3,
1048            backoff: BackoffStrategy::Exponential {
1049                initial: Duration::from_millis(100),
1050                max: Duration::from_secs(30),
1051            },
1052            retry_conditions: vec![RetryCondition::NetworkError, RetryCondition::Timeout],
1053        };
1054
1055        assert_eq!(retry_policy.max_attempts, 3);
1056        assert_eq!(retry_policy.retry_conditions.len(), 2);
1057    }
1058
1059    #[test]
1060    fn test_health_status() {
1061        let status = HealthStatus {
1062            is_healthy: true,
1063            response_time: Duration::from_millis(50),
1064            last_check: Instant::now(),
1065            error_message: None,
1066            metadata: BTreeMap::from([("service".to_string(), "test".to_string())]),
1067        };
1068
1069        assert!(status.is_healthy);
1070        assert!(status.error_message.is_none());
1071        assert_eq!(status.metadata.len(), 1);
1072    }
1073}
sklears_compose/external_integration.rs

sklears_compose/
external_integration.rs
