Incorrect mapping of JSON keys

[jpenna]

Hello and thanks for this project!

I wasn't getting the FinishReason, so I looked into the response sent by Groq and found that the mapping is wrong. Instead of camel case, they are using snake case:

{
  "id": "chatcmpl-038eb64d-d89d-4095-9ae0-aa28f15ee894",
  "object": "chat.completion",
  "created": 1729027271,
  "model": "mixtral-8x7b-32768",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "{\n  \"title\": \"thread_relevance\",\n  \"description\": \"The relevance data of this thread\",\n  \"type\": \"object\",\n  \"required\": [\n    \"relevance\"\n  ],\n  \"properties\": {\n    \"relevance\": \"regular\",\n    \"description\": \"Discussing the upcoming team meeting agenda\",\n    \"whyMatters\": \"Affects the entire team's schedule and tasks\"\n  }\n}"
      },
      "logprobs": null,
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "queue_time": 0.0009843939999999995,
    "prompt_tokens": 319,
    "prompt_time": 0.018412544,
    "completion_tokens": 110,
    "completion_time": 0.176677053,
    "total_tokens": 429,
    "total_time": 0.195089597
  },
  "system_fingerprint": "fp_c5f20b5bb1",
  "x_groq": { "id": "req_01ja90wtajf6497an9fnywdy5y" }
}

The lib expects the keys to be camel case:

type Choice struct {
	FinishReason string         `json:"finishReason"`
	Index        int            `json:"index"`
	Logprobs     ChoiceLogprobs `json:"logprobs"`
	Message      ChoiceMessage  `json:"message"`
}

// Usage struct to handle usage data
type Usage struct {
	CompletionTime   *float64 `json:"completionTime,omitempty"`
	CompletionTokens *int     `json:"completionTokens,omitempty"`
	PromptTime       *float64 `json:"promptTime,omitempty"`
	PromptTokens     *int     `json:"promptTokens,omitempty"`
	QueueTime        *float64 `json:"queueTime,omitempty"`
	TotalTime        *float64 `json:"totalTime,omitempty"`
	TotalTokens      *int     `json:"totalTokens,omitempty"`
}

I don't know if this was changed later by the Groq team?