just-llm-client 0.2.0

Just a lightweight, composable, and minimal LLM client — not an agent framework
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117

use serde::{Deserialize, Serialize};

use super::{
    ChatCompletionChunkToolCall, ChatCompletionLogprobs, ChatToolCall, FinishReason, Usage,
};

/// Normalized non-streaming chat completion response.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ChatCompletionResponse {
    pub id: String,
    pub choices: Vec<ChatChoice>,
    pub created: i64,
    pub model: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub system_fingerprint: Option<String>,
    pub object: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub usage: Option<Usage>,
}

impl ChatCompletionResponse {
    /// Returns the first response choice when present.
    pub fn first_choice(&self) -> Option<&ChatChoice> {
        self.choices.first()
    }

    /// Returns the first assistant message when present.
    pub fn first_message(&self) -> Option<&AssistantMessage> {
        self.first_choice().map(|choice| &choice.message)
    }

    /// Returns the first choice's text content when present.
    pub fn first_choice_content(&self) -> Option<&str> {
        self.first_message()
            .and_then(|message| message.content.as_deref())
    }

    /// Returns the first choice's reasoning content when present.
    pub fn first_choice_reasoning_content(&self) -> Option<&str> {
        self.first_message()
            .and_then(|message| message.reasoning_content.as_deref())
    }

    /// Returns the first choice's tool calls when present.
    pub fn first_choice_tool_calls(&self) -> Option<&[ChatToolCall]> {
        self.first_message()
            .and_then(|message| message.tool_calls.as_deref())
    }
}

/// One choice inside a non-streaming response.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ChatChoice {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub finish_reason: Option<FinishReason>,
    pub index: u32,
    pub message: AssistantMessage,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub logprobs: Option<ChatCompletionLogprobs>,
}

/// Assistant message returned in a non-streaming response.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct AssistantMessage {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub content: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub reasoning_content: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_calls: Option<Vec<ChatToolCall>>,
    pub role: AssistantRole,
}

/// Assistant role values currently normalized by the client layer.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
#[serde(rename_all = "lowercase")]
pub enum AssistantRole {
    Assistant,
}

/// Normalized streaming chunk.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ChatCompletionChunk {
    pub id: String,
    pub choices: Vec<ChatCompletionChunkChoice>,
    pub created: i64,
    pub model: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub system_fingerprint: Option<String>,
    pub object: String,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub usage: Option<Usage>,
}

/// One choice inside a streaming chunk.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct ChatCompletionChunkChoice {
    pub delta: DeltaMessage,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub finish_reason: Option<FinishReason>,
    pub index: u32,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub logprobs: Option<ChatCompletionLogprobs>,
}

/// Incremental assistant delta payload.
#[derive(Clone, Debug, Serialize, Deserialize, PartialEq)]
pub struct DeltaMessage {
    #[serde(skip_serializing_if = "Option::is_none")]
    pub content: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub reasoning_content: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub role: Option<AssistantRole>,
    #[serde(skip_serializing_if = "Option::is_none")]
    pub tool_calls: Option<Vec<ChatCompletionChunkToolCall>>,
}