feat: support cohere (close #195)

relay/channel/cohere/dto.go

@@ -0,0 +1,44 @@
+package cohere
+
+type CohereRequest struct {
+	Model       string        `json:"model"`
+	ChatHistory []ChatHistory `json:"chat_history"`
+	Message     string        `json:"message"`
+	Stream      bool          `json:"stream"`
+	MaxTokens   int64         `json:"max_tokens"`
+}
+
+type ChatHistory struct {
+	Role    string `json:"role"`
+	Message string `json:"message"`
+}
+
+type CohereResponse struct {
+	IsFinished   bool                  `json:"is_finished"`
+	EventType    string                `json:"event_type"`
+	Text         string                `json:"text,omitempty"`
+	FinishReason string                `json:"finish_reason,omitempty"`
+	Response     *CohereResponseResult `json:"response"`
+}
+
+type CohereResponseResult struct {
+	ResponseId   string     `json:"response_id"`
+	FinishReason string     `json:"finish_reason,omitempty"`
+	Text         string     `json:"text"`
+	Meta         CohereMeta `json:"meta"`
+}
+
+type CohereMeta struct {
+	//Tokens CohereTokens `json:"tokens"`
+	BilledUnits CohereBilledUnits `json:"billed_units"`
+}
+
+type CohereBilledUnits struct {
+	InputTokens  int `json:"input_tokens"`
+	OutputTokens int `json:"output_tokens"`
+}
+
+type CohereTokens struct {
+	InputTokens  int `json:"input_tokens"`
+	OutputTokens int `json:"output_tokens"`
+}