ironflow_api/
error.rs

1//! REST API error types and responses.
2//!
3//! [`ApiError`] is the primary error type for all API handlers. It implements
4//! [`IntoResponse`] to serialize errors to JSON
5//! with proper HTTP status codes.
6
7use axum::Json;
8use axum::http::StatusCode;
9use axum::response::{IntoResponse, Response};
10use ironflow_engine::error::MONTHLY_BUDGET_EXCEEDED_CODE;
11use ironflow_store::error::StoreError;
12use ironflow_types::ErrorEnvelope;
13use serde_json::{Value, json};
14use thiserror::Error;
15use tracing::{error, warn};
16use uuid::Uuid;
17
18/// Error type for REST API operations.
19///
20/// Maps to appropriate HTTP status codes and error codes in the JSON response.
21///
22/// # Examples
23///
24/// ```
25/// use ironflow_api::error::ApiError;
26/// use uuid::Uuid;
27///
28/// let err = ApiError::RunNotFound(Uuid::nil());
29/// assert_eq!(err.to_string(), "run not found");
30/// ```
31#[derive(Debug, Error)]
32pub enum ApiError {
33    /// The requested run does not exist (404).
34    #[error("run not found")]
35    RunNotFound(Uuid),
36
37    /// The requested step does not exist (404).
38    #[error("step not found")]
39    StepNotFound(Uuid),
40
41    /// Workflow not found (404).
42    #[error("workflow not found")]
43    WorkflowNotFound(String),
44
45    /// Bad request: invalid input (400).
46    #[error("{0}")]
47    BadRequest(String),
48
49    /// The request conflicts with the current state of the resource (409).
50    #[error("{0}")]
51    Conflict(String),
52
53    /// Authentication required (401).
54    #[error("authentication required")]
55    Unauthorized,
56
57    /// Invalid credentials (401).
58    #[error("invalid credentials")]
59    InvalidCredentials,
60
61    /// Email already taken (409).
62    #[error("email already exists")]
63    DuplicateEmail,
64
65    /// Username already taken (409).
66    #[error("username already exists")]
67    DuplicateUsername,
68
69    /// API key not found (404).
70    #[error("API key not found")]
71    ApiKeyNotFound(Uuid),
72
73    /// User not found (404).
74    #[error("user not found")]
75    UserNotFound(Uuid),
76
77    /// Insufficient permissions for this action (403).
78    #[error("insufficient permissions")]
79    Forbidden,
80
81    /// Secret not found (404).
82    #[error("secret not found")]
83    SecretNotFound(String),
84
85    /// Insufficient scope (403).
86    #[error("insufficient scope")]
87    InsufficientScope,
88
89    /// The idempotency key is already bound to a different request (409).
90    ///
91    /// Carries the run holding the key so the client can inspect it.
92    #[error("idempotency key already used with a different request")]
93    IdempotencyKeyConflict(Uuid),
94    /// The global monthly cost quota is exhausted (429).
95    ///
96    /// Only blocks the creation of new runs; runs already in flight continue.
97    #[error("{0}")]
98    MonthlyBudgetExceeded(String),
99
100    /// The requested artifact does not exist (404).
101    #[error("artifact not found")]
102    ArtifactNotFound(String),
103
104    /// No artifact storage backend is configured (501).
105    ///
106    /// Every other endpoint keeps working: an upgraded deployment that has not
107    /// opted into artifacts is degraded here only.
108    #[error("artifact storage is not configured")]
109    ArtifactStorageUnavailable,
110
111    /// The uploaded payload exceeded the artifact size limit (413).
112    #[error("artifact exceeds the size limit")]
113    ArtifactTooLarge,
114
115    /// Schedule not found (404).
116    #[error("schedule not found")]
117    ScheduleNotFound(Uuid),
118
119    /// Store operation failed (500).
120    #[error("database error")]
121    Store(StoreError),
122
123    /// Internal server error (500).
124    #[error("internal server error")]
125    Internal(String),
126}
127
128impl From<StoreError> for ApiError {
129    fn from(e: StoreError) -> Self {
130        match e {
131            StoreError::ScheduleNotFound(id) => ApiError::ScheduleNotFound(id),
132            other => ApiError::Store(other),
133        }
134    }
135}
136
137impl ApiError {
138    /// Return the error code for JSON serialization.
139    fn code(&self) -> &str {
140        match self {
141            ApiError::RunNotFound(_) => "RUN_NOT_FOUND",
142            ApiError::StepNotFound(_) => "STEP_NOT_FOUND",
143            ApiError::WorkflowNotFound(_) => "WORKFLOW_NOT_FOUND",
144            ApiError::BadRequest(_) => "BAD_REQUEST",
145            ApiError::Conflict(_) => "CONFLICT",
146            ApiError::Unauthorized => "UNAUTHORIZED",
147            ApiError::InvalidCredentials => "INVALID_CREDENTIALS",
148            ApiError::DuplicateEmail => "DUPLICATE_EMAIL",
149            ApiError::DuplicateUsername => "DUPLICATE_USERNAME",
150            ApiError::ApiKeyNotFound(_) => "API_KEY_NOT_FOUND",
151            ApiError::UserNotFound(_) => "USER_NOT_FOUND",
152            ApiError::SecretNotFound(_) => "SECRET_NOT_FOUND",
153            ApiError::Forbidden => "FORBIDDEN",
154            ApiError::InsufficientScope => "INSUFFICIENT_SCOPE",
155            ApiError::IdempotencyKeyConflict(_) => "IDEMPOTENCY_KEY_CONFLICT",
156            ApiError::MonthlyBudgetExceeded(_) => MONTHLY_BUDGET_EXCEEDED_CODE,
157            ApiError::ArtifactNotFound(_) => "ARTIFACT_NOT_FOUND",
158            ApiError::ArtifactStorageUnavailable => "ARTIFACT_STORAGE_UNAVAILABLE",
159            ApiError::ArtifactTooLarge => "ARTIFACT_TOO_LARGE",
160            ApiError::ScheduleNotFound(_) => "SCHEDULE_NOT_FOUND",
161            ApiError::Store(StoreError::Crypto(_)) => "SECRET_STORE_UNAVAILABLE",
162            ApiError::Store(StoreError::DuplicateArtifact { .. }) => "DUPLICATE_ARTIFACT",
163            ApiError::Store(StoreError::LeaseLost { .. }) => "LEASE_LOST",
164            ApiError::Store(_) => "DATABASE_ERROR",
165            ApiError::Internal(_) => "INTERNAL_ERROR",
166        }
167    }
168
169    /// Return the HTTP status code for this error.
170    fn status(&self) -> StatusCode {
171        match self {
172            ApiError::RunNotFound(_) => StatusCode::NOT_FOUND,
173            ApiError::StepNotFound(_) => StatusCode::NOT_FOUND,
174            ApiError::WorkflowNotFound(_) => StatusCode::NOT_FOUND,
175            ApiError::SecretNotFound(_) => StatusCode::NOT_FOUND,
176            ApiError::BadRequest(_) => StatusCode::BAD_REQUEST,
177            ApiError::Conflict(_) => StatusCode::CONFLICT,
178            ApiError::Unauthorized => StatusCode::UNAUTHORIZED,
179            ApiError::InvalidCredentials => StatusCode::UNAUTHORIZED,
180            ApiError::DuplicateEmail => StatusCode::CONFLICT,
181            ApiError::DuplicateUsername => StatusCode::CONFLICT,
182            ApiError::ApiKeyNotFound(_) => StatusCode::NOT_FOUND,
183            ApiError::UserNotFound(_) => StatusCode::NOT_FOUND,
184            ApiError::Forbidden => StatusCode::FORBIDDEN,
185            ApiError::InsufficientScope => StatusCode::FORBIDDEN,
186            ApiError::IdempotencyKeyConflict(_) => StatusCode::CONFLICT,
187            ApiError::MonthlyBudgetExceeded(_) => StatusCode::TOO_MANY_REQUESTS,
188            ApiError::ArtifactNotFound(_) => StatusCode::NOT_FOUND,
189            ApiError::ArtifactStorageUnavailable => StatusCode::NOT_IMPLEMENTED,
190            ApiError::ArtifactTooLarge => StatusCode::PAYLOAD_TOO_LARGE,
191            ApiError::ScheduleNotFound(_) => StatusCode::NOT_FOUND,
192            ApiError::Store(StoreError::Crypto(_)) => StatusCode::NOT_IMPLEMENTED,
193            ApiError::Store(StoreError::DuplicateArtifact { .. }) => StatusCode::CONFLICT,
194            ApiError::Store(StoreError::LeaseLost { .. }) => StatusCode::CONFLICT,
195            ApiError::Store(_) => StatusCode::INTERNAL_SERVER_ERROR,
196            ApiError::Internal(_) => StatusCode::INTERNAL_SERVER_ERROR,
197        }
198    }
199
200    /// Structured context attached to the JSON error body, if any.
201    ///
202    /// Never carries internal detail: only identifiers the caller is already
203    /// entitled to see.
204    fn details(&self) -> Option<Value> {
205        match self {
206            ApiError::IdempotencyKeyConflict(run_id) => Some(json!({ "run_id": run_id })),
207            _ => None,
208        }
209    }
210}
211
212impl IntoResponse for ApiError {
213    fn into_response(self) -> Response {
214        let status = self.status();
215        let code = self.code().to_string();
216        let details = self.details();
217
218        let message = match &self {
219            ApiError::Store(StoreError::Crypto(_)) => {
220                "secret store not configured (set IRONFLOW_SECRET_KEYS)".to_string()
221            }
222            // Carries the caller-facing detail in its own Display impl,
223            // unlike the generic "database error" of ApiError::Store.
224            ApiError::Store(e @ StoreError::LeaseLost { .. }) => e.to_string(),
225            _ => self.to_string(),
226        };
227
228        match &self {
229            // A lost lease is a client-side condition, not a server fault:
230            // it must not page anyone.
231            ApiError::Store(e @ StoreError::LeaseLost { .. }) => {
232                warn!(error = %e, code = %code, "lease refused")
233            }
234            ApiError::Store(e) => error!(error = %e, code = %code, "store error"),
235            ApiError::Internal(detail) => {
236                error!(detail = %detail, code = %code, "internal error")
237            }
238            _ => {}
239        }
240
241        let envelope = ErrorEnvelope {
242            code,
243            message,
244            details,
245        };
246
247        (status, Json(json!({ "error": envelope }))).into_response()
248    }
249}
250
251#[cfg(test)]
252mod tests {
253    use super::*;
254
255    #[test]
256    fn run_not_found_code() {
257        let err = ApiError::RunNotFound(Uuid::nil());
258        assert_eq!(err.code(), "RUN_NOT_FOUND");
259    }
260
261    #[test]
262    fn run_not_found_status() {
263        let err = ApiError::RunNotFound(Uuid::nil());
264        assert_eq!(err.status(), StatusCode::NOT_FOUND);
265    }
266
267    #[test]
268    fn bad_request_status() {
269        let err = ApiError::BadRequest("invalid field".to_string());
270        assert_eq!(err.status(), StatusCode::BAD_REQUEST);
271        assert_eq!(err.code(), "BAD_REQUEST");
272    }
273
274    #[test]
275    fn conflict_status() {
276        let err = ApiError::Conflict("run is already waiting for a retry".to_string());
277        assert_eq!(err.status(), StatusCode::CONFLICT);
278        assert_eq!(err.code(), "CONFLICT");
279    }
280
281    #[test]
282    fn internal_error_status() {
283        let err = ApiError::Internal("something went wrong".to_string());
284        assert_eq!(err.status(), StatusCode::INTERNAL_SERVER_ERROR);
285        assert_eq!(err.code(), "INTERNAL_ERROR");
286    }
287
288    #[test]
289    fn error_to_response() {
290        let err = ApiError::BadRequest("invalid input".to_string());
291        let response = err.into_response();
292        assert_eq!(response.status(), StatusCode::BAD_REQUEST);
293    }
294
295    #[test]
296    fn unauthorized_status() {
297        let err = ApiError::Unauthorized;
298        assert_eq!(err.status(), StatusCode::UNAUTHORIZED);
299        assert_eq!(err.code(), "UNAUTHORIZED");
300    }
301
302    #[test]
303    fn invalid_credentials_status() {
304        let err = ApiError::InvalidCredentials;
305        assert_eq!(err.status(), StatusCode::UNAUTHORIZED);
306        assert_eq!(err.code(), "INVALID_CREDENTIALS");
307    }
308
309    #[test]
310    fn duplicate_email_status() {
311        let err = ApiError::DuplicateEmail;
312        assert_eq!(err.status(), StatusCode::CONFLICT);
313        assert_eq!(err.code(), "DUPLICATE_EMAIL");
314    }
315
316    #[test]
317    fn duplicate_username_status() {
318        let err = ApiError::DuplicateUsername;
319        assert_eq!(err.status(), StatusCode::CONFLICT);
320        assert_eq!(err.code(), "DUPLICATE_USERNAME");
321    }
322
323    #[test]
324    fn workflow_not_found_status() {
325        let err = ApiError::WorkflowNotFound("test".to_string());
326        assert_eq!(err.status(), StatusCode::NOT_FOUND);
327        assert_eq!(err.code(), "WORKFLOW_NOT_FOUND");
328    }
329
330    #[test]
331    fn step_not_found_status() {
332        let err = ApiError::StepNotFound(Uuid::nil());
333        assert_eq!(err.status(), StatusCode::NOT_FOUND);
334        assert_eq!(err.code(), "STEP_NOT_FOUND");
335    }
336
337    #[test]
338    fn user_not_found_status() {
339        let err = ApiError::UserNotFound(Uuid::nil());
340        assert_eq!(err.status(), StatusCode::NOT_FOUND);
341        assert_eq!(err.code(), "USER_NOT_FOUND");
342    }
343
344    #[test]
345    fn forbidden_status() {
346        let err = ApiError::Forbidden;
347        assert_eq!(err.status(), StatusCode::FORBIDDEN);
348        assert_eq!(err.code(), "FORBIDDEN");
349    }
350
351    #[test]
352    fn secret_not_found_status() {
353        let err = ApiError::SecretNotFound("demo/api-key".to_string());
354        assert_eq!(err.status(), StatusCode::NOT_FOUND);
355        assert_eq!(err.code(), "SECRET_NOT_FOUND");
356    }
357
358    #[test]
359    fn monthly_budget_exceeded_status_and_code() {
360        let err = ApiError::MonthlyBudgetExceeded("quota exhausted".to_string());
361        assert_eq!(err.status(), StatusCode::TOO_MANY_REQUESTS);
362        assert_eq!(err.code(), "MONTHLY_BUDGET_EXCEEDED");
363        assert_eq!(err.to_string(), "quota exhausted");
364    }
365}
ironflow_api/error.rs

ironflow_api/
error.rs
