refactor: update Deepseek API implementation

- Switch to OpenAI SDK for Deepseek API calls
- Add openai package dependency
- Update configuration for Deepseek API
- Update environment variable examples
- Improve error handling for API responses

This change improves reliability and maintainability by using the official SDK
with proper typing and error handling.

.env.example

@@ -1,7 +1,7 @@
 # Deepseek API Configuration
 DEEPSEEK_API_KEY=your_deepseek_api_key_here
-DEEPSEEK_API_BASE_URL=https://api.deepseek.com/v1
+DEEPSEEK_API_BASE_URL=https://api.deepseek.com
-DEEPSEEK_MODEL=deepseek-coder
+DEEPSEEK_MODEL=deepseek-chat
 DEEPSEEK_MAX_RETRIES=3
 DEEPSEEK_TIMEOUT=30000
 

package-lock.json

@@ -13,6 +13,7 @@
         "@types/node": "^22.10.10",
         "axios": "^1.7.9",
         "dotenv": "^16.4.7",
+        "openai": "^4.80.1",
         "typescript": "^5.7.3"
       }
     },
@@ -41,6 +42,40 @@
         "undici-types": "~6.20.0"
       }
     },
+    "node_modules/@types/node-fetch": {
+      "version": "2.6.12",
+      "resolved": "https://registry.npmjs.org/@types/node-fetch/-/node-fetch-2.6.12.tgz",
+      "integrity": "sha512-8nneRWKCg3rMtF69nLQJnOYUcbafYeFSjqkw3jCRLsqkWFlHaoQrr5mXmofFGOx3DKn7UfmBMyov8ySvLRVldA==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*",
+        "form-data": "^4.0.0"
+      }
+    },
+    "node_modules/abort-controller": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/abort-controller/-/abort-controller-3.0.0.tgz",
+      "integrity": "sha512-h8lQ8tacZYnR3vNQTgibj+tODHI5/+l06Au2Pcriv/Gmet0eaj4TwWH41sO9wnHDiQsEj19q0drzdWdeAHtweg==",
+      "license": "MIT",
+      "dependencies": {
+        "event-target-shim": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=6.5"
+      }
+    },
+    "node_modules/agentkeepalive": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/agentkeepalive/-/agentkeepalive-4.6.0.tgz",
+      "integrity": "sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ==",
+      "license": "MIT",
+      "dependencies": {
+        "humanize-ms": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 8.0.0"
+      }
+    },
     "node_modules/asynckit": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
@@ -118,6 +153,15 @@
         "url": "https://dotenvx.com"
       }
     },
+    "node_modules/event-target-shim": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/event-target-shim/-/event-target-shim-5.0.1.tgz",
+      "integrity": "sha512-i/2XbnSz/uxRCU6+NdVJgKWDTM427+MqYbkQzD321DuCQJUqOuJKIA0IM2+W2xtYHdKOmZ4dR6fExsd4SXL+WQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/eventsource": {
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/eventsource/-/eventsource-3.0.2.tgz",
@@ -173,6 +217,25 @@
         "node": ">= 6"
       }
     },
+    "node_modules/form-data-encoder": {
+      "version": "1.7.2",
+      "resolved": "https://registry.npmjs.org/form-data-encoder/-/form-data-encoder-1.7.2.tgz",
+      "integrity": "sha512-qfqtYan3rxrnCk1VYaA4H+Ms9xdpPqvLZa6xmMgFvhO32x7/3J/ExcTd6qpxM0vH2GdMI+poehyBZvqfMTto8A==",
+      "license": "MIT"
+    },
+    "node_modules/formdata-node": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/formdata-node/-/formdata-node-4.4.1.tgz",
+      "integrity": "sha512-0iirZp3uVDjVGt9p49aTaqjk84TrglENEDuqfdlZQ1roC9CWlPk6Avf8EEnZNcAqPonwkG35x4n3ww/1THYAeQ==",
+      "license": "MIT",
+      "dependencies": {
+        "node-domexception": "1.0.0",
+        "web-streams-polyfill": "4.0.0-beta.3"
+      },
+      "engines": {
+        "node": ">= 12.20"
+      }
+    },
     "node_modules/http-errors": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-2.0.0.tgz",
@@ -189,6 +252,15 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/humanize-ms": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/humanize-ms/-/humanize-ms-1.2.1.tgz",
+      "integrity": "sha512-Fl70vYtsAFb/C06PTS9dZBo7ihau+Tu/DNCk/OyHhea07S+aeMWpFFkUaXRa8fI+ScZbEI8dfSxwY7gxZ9SAVQ==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.0.0"
+      }
+    },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
@@ -228,6 +300,96 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "license": "MIT"
+    },
+    "node_modules/node-domexception": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/node-domexception/-/node-domexception-1.0.0.tgz",
+      "integrity": "sha512-/jKZoMpw0F8GRwl4/eLROPA3cfcXtLApP0QzLmUT/HuPCZWyB7IY9ZrMeKw2O/nFIqPQB3PVM9aYm0F312AXDQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/jimmywarting"
+        },
+        {
+          "type": "github",
+          "url": "https://paypal.me/jimmywarting"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.5.0"
+      }
+    },
+    "node_modules/node-fetch": {
+      "version": "2.7.0",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.7.0.tgz",
+      "integrity": "sha512-c4FRfUm/dbcWZ7U+1Wq0AwCyFL+3nt2bEw05wfxSz+DWpWsitgmSgYmy2dQdWyKC1694ELPqMs/YzUSNozLt8A==",
+      "license": "MIT",
+      "dependencies": {
+        "whatwg-url": "^5.0.0"
+      },
+      "engines": {
+        "node": "4.x || >=6.0.0"
+      },
+      "peerDependencies": {
+        "encoding": "^0.1.0"
+      },
+      "peerDependenciesMeta": {
+        "encoding": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/openai": {
+      "version": "4.80.1",
+      "resolved": "https://registry.npmjs.org/openai/-/openai-4.80.1.tgz",
+      "integrity": "sha512-+6+bbXFwbIE88foZsBEt36bPkgZPdyFN82clAXG61gnHb2gXdZApDyRrcAHqEtpYICywpqaNo57kOm9dtnb7Cw==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/node": "^18.11.18",
+        "@types/node-fetch": "^2.6.4",
+        "abort-controller": "^3.0.0",
+        "agentkeepalive": "^4.2.1",
+        "form-data-encoder": "1.7.2",
+        "formdata-node": "^4.3.2",
+        "node-fetch": "^2.6.7"
+      },
+      "bin": {
+        "openai": "bin/cli"
+      },
+      "peerDependencies": {
+        "ws": "^8.18.0",
+        "zod": "^3.23.8"
+      },
+      "peerDependenciesMeta": {
+        "ws": {
+          "optional": true
+        },
+        "zod": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/openai/node_modules/@types/node": {
+      "version": "18.19.74",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-18.19.74.tgz",
+      "integrity": "sha512-HMwEkkifei3L605gFdV+/UwtpxP6JSzM+xFk2Ia6DNFSwSVBRh9qp5Tgf4lNFOMfPVuU0WnkcWpXZpgn5ufO4A==",
+      "license": "MIT",
+      "dependencies": {
+        "undici-types": "~5.26.4"
+      }
+    },
+    "node_modules/openai/node_modules/undici-types": {
+      "version": "5.26.5",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-5.26.5.tgz",
+      "integrity": "sha512-JlCMO+ehdEIKqlFxk6IfVoAUVmgz7cU7zD/h9XZ0qzeosSHmUJVOzSQvvYSYWXkFXC+IfLKSIffhv0sVZup6pA==",
+      "license": "MIT"
+    },
     "node_modules/proxy-from-env": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
@@ -279,6 +441,12 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/tr46": {
+      "version": "0.0.3",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
+      "integrity": "sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==",
+      "license": "MIT"
+    },
     "node_modules/typescript": {
       "version": "5.7.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.7.3.tgz",
@@ -307,6 +475,31 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/web-streams-polyfill": {
+      "version": "4.0.0-beta.3",
+      "resolved": "https://registry.npmjs.org/web-streams-polyfill/-/web-streams-polyfill-4.0.0-beta.3.tgz",
+      "integrity": "sha512-QW95TCTaHmsYfHDybGMwO5IJIM93I/6vTRk+daHTWFPhwh+C8Cg7j7XyKrwrj8Ib6vYXe0ocYNrmzY4xAAN6ug==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 14"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
+      "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
+      "license": "BSD-2-Clause"
+    },
+    "node_modules/whatwg-url": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
+      "integrity": "sha512-saE57nupxk6v3HY35+jzBwYa0rKSy0XR8JSxZPwgLr7ys0IBzhGviA1/TUGJLmSVqs8pb9AnvICXEuOHLprYTw==",
+      "license": "MIT",
+      "dependencies": {
+        "tr46": "~0.0.3",
+        "webidl-conversions": "^3.0.0"
+      }
+    },
     "node_modules/zod": {
       "version": "3.24.1",
       "resolved": "https://registry.npmjs.org/zod/-/zod-3.24.1.tgz",

package.json

@@ -19,6 +19,7 @@
     "@types/node": "^22.10.10",
     "axios": "^1.7.9",
     "dotenv": "^16.4.7",
-    "typescript": "^5.7.3"
+    "typescript": "^5.7.3",
+    "openai": "^4.80.1"
   }
 }

src/api/deepseek/deepseek.ts

@@ -1,41 +1,8 @@
-import axios, { AxiosError, AxiosInstance } from 'axios';
+import OpenAI from 'openai';
 import type { LLMResponse } from '../../types/index.js';
 import { config } from '../../config.js';
 import { sanitizeInput } from '../../utils/prompt.js';
 
-/**
- * Interface for Deepseek API message format
- */
-interface DeepseekMessage {
-  role: 'system' | 'user' | 'assistant';
-  content: string;
-}
-
-/**
- * Interface for Deepseek API response format
- */
-interface DeepseekResponse {
-  choices: Array<{
-    message: {
-      content: string;
-    };
-    finish_reason?: string;
-  }>;
-  usage?: {
-    prompt_tokens: number;
-    completion_tokens: number;
-    total_tokens: number;
-  };
-}
-
-/**
- * Interface for API error response
- */
-interface ApiErrorResponse {
-  message?: string;
-  error?: string;
-}
-
 /**
  * Rate limiter implementation using token bucket algorithm
  */
@@ -75,61 +42,24 @@ class RateLimiter {
 }
 
 /**
- * Deepseek API client class
+ * Deepseek API client class using OpenAI SDK
  */
 class DeepseekClient {
-  private readonly axiosInstance: AxiosInstance;
+  private readonly client: OpenAI;
   private readonly rateLimiter: RateLimiter;
 
   constructor() {
-    this.axiosInstance = axios.create({
+    this.client = new OpenAI({
-      baseURL: config.api.baseUrl,
+      baseURL: config.api.baseUrl || 'https://api.deepseek.com',
-      timeout: config.api.timeout,
+      apiKey: config.api.apiKey,
-      headers: {
+      defaultQuery: { model: config.api.model || 'deepseek-chat' },
-        'Content-Type': 'application/json',
+      defaultHeaders: { 'api-key': config.api.apiKey }
-        'Authorization': `Bearer ${config.api.apiKey}`,
-      },
     });
 
     this.rateLimiter = new RateLimiter(
       50,  // max 50 requests
       10   // refill 10 tokens per second
     );
-
-    // Add response interceptor for error handling
-    this.axiosInstance.interceptors.response.use(
-      response => response,
-      this.handleApiError.bind(this)
-    );
-  }
-
-  /**
-   * Handles API errors and transforms them into appropriate responses
-   */
-  private async handleApiError(error: AxiosError<ApiErrorResponse>): Promise<never> {
-    if (error.response) {
-      // The request was made and the server responded with a status code
-      // that falls out of the range of 2xx
-      const status = error.response.status;
-      const message = error.response.data?.message || error.response.data?.error || error.message;
-
-      switch (status) {
-        case 401:
-          throw new Error('Authentication failed: Invalid API key');
-        case 429:
-          throw new Error('Rate limit exceeded. Please try again later.');
-        case 500:
-          throw new Error('Deepseek API server error. Please try again later.');
-        default:
-          throw new Error(`API error: ${message}`);
-      }
-    } else if (error.request) {
-      // The request was made but no response was received
-      throw new Error('No response received from Deepseek API');
-    } else {
-      // Something happened in setting up the request
-      throw new Error(`Error setting up request: ${error.message}`);
-    }
   }
 
   /**
@@ -147,7 +77,7 @@ class DeepseekClient {
         return await operation();
       } catch (error) {
         lastError = error as Error;
-        if (error instanceof AxiosError && error.response?.status === 429) {
+        if (error instanceof OpenAI.APIError && error.status === 429) {
           const delay = baseDelay * Math.pow(2, attempt);
           await new Promise(resolve => setTimeout(resolve, delay));
           continue;
@@ -180,37 +110,38 @@ class DeepseekClient {
       const sanitizedPrompt = sanitizeInput(prompt);
       const sanitizedSystemPrompt = sanitizeInput(systemPrompt);
 
-      const messages: DeepseekMessage[] = [
-        {
-          role: 'system',
-          content: sanitizedSystemPrompt,
-        },
-        {
-          role: 'user',
-          content: sanitizedPrompt,
-        },
-      ];
-
       const response = await this.retryWithExponentialBackoff(async () => {
-        const result = await this.axiosInstance.post<DeepseekResponse>('/chat/completions', {
+        const completion = await this.client.chat.completions.create({
-          model: config.api.model,
+          messages: [
-          messages,
+            { role: 'system', content: sanitizedSystemPrompt },
+            { role: 'user', content: sanitizedPrompt }
+          ],
+          model: config.api.model || 'deepseek-chat',
           temperature: 0.7,
-          max_tokens: 2048,
+          max_tokens: 2048
         });
-        return result;
+
+        return completion;
       });
 
       return {
-        text: response.data.choices[0].message.content,
+        text: response.choices[0]?.message?.content || '',
         isError: false,
       };
     } catch (error) {
       console.error('Deepseek API error:', error);
+      let errorMessage = 'Unknown error occurred';
+      
+      if (error instanceof OpenAI.APIError) {
+        errorMessage = error.message;
+      } else if (error instanceof Error) {
+        errorMessage = error.message;
+      }
+
       return {
         text: '',
         isError: true,
-        errorMessage: error instanceof Error ? error.message : 'Unknown error occurred',
+        errorMessage
       };
     }
   }

src/config.ts

@@ -14,8 +14,8 @@ function requireEnv(name: string): string {
 
 const apiConfig: APIConfig = {
   apiKey: requireEnv('DEEPSEEK_API_KEY'),
-  baseUrl: process.env.DEEPSEEK_API_BASE_URL || 'https://api.deepseek.com/v1',
+  baseUrl: process.env.DEEPSEEK_API_BASE_URL || 'https://api.deepseek.com',
-  model: process.env.DEEPSEEK_MODEL || 'deepseek-coder',
+  model: process.env.DEEPSEEK_MODEL || 'deepseek-chat',
   maxRetries: parseInt(process.env.DEEPSEEK_MAX_RETRIES || '3', 10),
   timeout: parseInt(process.env.DEEPSEEK_TIMEOUT || '30000', 10),
 };