feat(server): API relay gateway backend M0-M4

Gin + GORM + pure-Go SQLite. Users/auth (JWT), API key management with quotas, proxy gateway with weighted channel failover and health checks, usage/billing ledger, cross-protocol conversion (Anthropic Messages / OpenAI Chat Completions / OpenAI Responses), and channel/model admin API. Channels declare native API formats and auto-convert the rest. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-08-15 21:05:02 +08:00
parent b0c7439c01
commit d0e31b198f
45 changed files with 6222 additions and 0 deletions
@@ -0,0 +1,87 @@
+package openai
+
+import "encoding/json"
+
+// ChatRequest is a chat completions request. Only the fields the gateway
+// needs are typed; the rest is preserved via Raw for passthrough.
+type ChatRequest struct {
+	Model       string          `json:"model"`
+	Messages    json.RawMessage `json:"messages"`
+	Stream      bool            `json:"stream"`
+	Temperature *float64        `json:"temperature"`
+	TopP        *float64        `json:"top_p"`
+	MaxTokens   *int            `json:"max_tokens"`
+	MaxCompl    *int            `json:"max_completion_tokens"`
+	Stop        json.RawMessage `json:"stop"`
+	Tools       json.RawMessage `json:"tools"`
+	ToolChoice  json.RawMessage `json:"tool_choice"`
+	ResponseFmt json.RawMessage `json:"response_format"`
+	StreamOpts  json.RawMessage `json:"stream_options"`
+	User        string          `json:"user"`
+}
+
+// ChatMessage is one message in the canonical/chat shape.
+type ChatMessage struct {
+	Role      string          `json:"role"`
+	Content   json.RawMessage `json:"content,omitempty"`
+	Name      string          `json:"name,omitempty"`
+	ToolCalls json.RawMessage `json:"tool_calls,omitempty"`
+	ToolCallID string         `json:"tool_call_id,omitempty"`
+}
+
+// Tool is a function tool definition.
+type Tool struct {
+	Type     string          `json:"type"`
+	Function FunctionTool    `json:"function"`
+}
+
+type FunctionTool struct {
+	Name        string          `json:"name"`
+	Description string          `json:"description"`
+	Parameters  json.RawMessage `json:"parameters"`
+}
+
+// ChatCompletion is the non-stream response.
+type ChatCompletion struct {
+	ID      string          `json:"id"`
+	Object  string          `json:"object"`
+	Created int64           `json:"created"`
+	Model   string          `json:"model"`
+	Choices []ChatChoice    `json:"choices"`
+	Usage   *Usage          `json:"usage,omitempty"`
+}
+
+type ChatChoice struct {
+	Index        int          `json:"index"`
+	Message      ChatMessage  `json:"message"`
+	FinishReason string       `json:"finish_reason"`
+}
+
+// Usage is the token usage block.
+type Usage struct {
+	PromptTokens     int64 `json:"prompt_tokens"`
+	CompletionTokens int64 `json:"completion_tokens"`
+	TotalTokens      int64 `json:"total_tokens"`
+}
+
+// ChatChunk is one streaming chunk.
+type ChatChunk struct {
+	ID      string        `json:"id"`
+	Object  string        `json:"object"`
+	Created int64         `json:"created"`
+	Model   string        `json:"model"`
+	Choices []ChatChunkChoice `json:"choices"`
+	Usage   *Usage        `json:"usage,omitempty"`
+}
+
+type ChatChunkChoice struct {
+	Index        int           `json:"index"`
+	Delta        ChatDelta     `json:"delta"`
+	FinishReason *string       `json:"finish_reason"`
+}
+
+type ChatDelta struct {
+	Role      string          `json:"role,omitempty"`
+	Content   string          `json:"content,omitempty"`
+	ToolCalls json.RawMessage `json:"tool_calls,omitempty"`
+}