starweaver-model 0.5.1

Provider-neutral model protocol and wire adapters for Starweaver
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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155

//! Provider usage parsing helpers.

use serde_json::Value;

pub fn usage_from_openai(value: &Value) -> starweaver_usage::Usage {
    let usage = value.get("usage");
    let input_tokens = usage
        .and_then(|u| u.get("prompt_tokens").or_else(|| u.get("input_tokens")))
        .and_then(Value::as_u64)
        .unwrap_or_default();
    let cache_write_tokens = usage.map_or(0, usage_cache_write_tokens);
    let cache_read_tokens = usage.map_or(0, usage_cache_read_tokens);
    let output_tokens = usage
        .and_then(|u| {
            u.get("completion_tokens")
                .or_else(|| u.get("output_tokens"))
        })
        .and_then(Value::as_u64)
        .unwrap_or_default();
    let computed_total = input_tokens.saturating_add(output_tokens);
    starweaver_usage::Usage {
        requests: 1,
        input_tokens,
        cache_write_tokens,
        cache_read_tokens,
        output_tokens,
        total_tokens: usage
            .and_then(|u| u.get("total_tokens"))
            .and_then(Value::as_u64)
            .unwrap_or(computed_total)
            .max(computed_total),
        tool_calls: 0,
    }
}

#[cfg(test)]
pub fn usage_from_named(value: &Value, input: &str, output: &str) -> starweaver_usage::Usage {
    usage_from_named_with_options(value, input, output, false, &[])
}

pub fn usage_from_named_including_cache_input(
    value: &Value,
    input: &str,
    output: &str,
) -> starweaver_usage::Usage {
    usage_from_named_with_options(value, input, output, true, &[])
}

pub fn usage_from_named_with_output_extras(
    value: &Value,
    input: &str,
    output: &str,
    output_extras: &[&str],
) -> starweaver_usage::Usage {
    usage_from_named_with_options(value, input, output, false, output_extras)
}

fn usage_from_named_with_options(
    value: &Value,
    input: &str,
    output: &str,
    add_cache_to_input: bool,
    output_extras: &[&str],
) -> starweaver_usage::Usage {
    let usage = value.get("usage").or_else(|| value.get("usageMetadata"));
    let input_base = usage
        .and_then(|u| u.get(input))
        .and_then(Value::as_u64)
        .unwrap_or_default();
    let cache_write_tokens = usage.map_or(0, usage_cache_write_tokens);
    let cache_read_tokens = usage.map_or(0, usage_cache_read_tokens);
    let input_tokens = if add_cache_to_input {
        input_base
            .saturating_add(cache_write_tokens)
            .saturating_add(cache_read_tokens)
    } else {
        input_base
    };
    let output_tokens = usage
        .and_then(|u| u.get(output))
        .and_then(Value::as_u64)
        .unwrap_or_default()
        .saturating_add(usage.map_or(0, |usage| usage_u64(usage, output_extras)));
    let computed_total = input_tokens.saturating_add(output_tokens);
    let total_tokens = usage
        .and_then(|u| u.get("totalTokens").or_else(|| u.get("total_tokens")))
        .and_then(Value::as_u64)
        .unwrap_or(computed_total)
        .max(computed_total);
    starweaver_usage::Usage {
        requests: 1,
        input_tokens,
        cache_write_tokens,
        cache_read_tokens,
        output_tokens,
        total_tokens,
        tool_calls: 0,
    }
}

fn usage_cache_write_tokens(usage: &Value) -> u64 {
    usage_u64(
        usage,
        &[
            "cache_write_tokens",
            "cache_creation_input_tokens",
            "cacheCreationInputTokens",
            "cacheWriteInputTokens",
            "cache_write_input_tokens",
        ],
    )
}

fn usage_cache_read_tokens(usage: &Value) -> u64 {
    let direct = usage_u64(
        usage,
        &[
            "cache_read_tokens",
            "cache_read_input_tokens",
            "cacheReadInputTokens",
            "cacheReadTokens",
            "cachedContentTokenCount",
            "cached_content_token_count",
        ],
    );
    if direct > 0 {
        return direct;
    }
    usage_nested_u64(
        usage,
        &[
            &["prompt_tokens_details", "cached_tokens"],
            &["input_tokens_details", "cached_tokens"],
            &["input_token_details", "cached_tokens"],
            &["inputTokenDetails", "cacheReadTokens"],
        ],
    )
}

fn usage_u64(value: &Value, keys: &[&str]) -> u64 {
    keys.iter()
        .find_map(|key| value.get(*key).and_then(Value::as_u64))
        .unwrap_or_default()
}

fn usage_nested_u64(value: &Value, paths: &[&[&str]]) -> u64 {
    paths
        .iter()
        .find_map(|path| {
            path.iter()
                .try_fold(value, |current, key| current.get(*key))
                .and_then(Value::as_u64)
        })
        .unwrap_or_default()
}