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a39b3c4af4
The release-date normalizer matched a bare "-YYYYMMDD" suffix on any id. Pricing looks every model up through it regardless of surface, and an operator can register a custom model under any id at all, so a custom "internal-llm-20250101" would silently inherit the rate registered for "internal-llm". Anchor the pattern on "claude" so it still covers the vendor-prefixed Bedrock forms while leaving every other vendor's id untouched.
80 lines
3.5 KiB
Go
80 lines
3.5 KiB
Go
// Package llm holds LLM model-identifier helpers shared by the proxy and
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// the management server. The proxy normalizes model ids parsed off inbound
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// requests; management normalizes the operator's registered model ids at
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// synthesis time so both sides of the pricing / routing contract compare
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// equal.
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package llm
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import (
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"regexp"
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"strings"
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)
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// bedrockRegionPrefixes are the cross-region inference-profile prefixes that
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// front a Bedrock model id (e.g. "eu.anthropic.claude-...").
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var bedrockRegionPrefixes = []string{"us.", "eu.", "apac.", "global."}
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// bedrockVersionSuffix matches the trailing "-vN[:N]" or "-YYYYMMDD-vN[:N]"
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// version/throughput suffix of a Bedrock model id.
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var bedrockVersionSuffix = regexp.MustCompile(`-(\d{8}-)?v\d+(:\d+)?$`)
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// NormalizeBedrockModel strips an ARN wrapper, a cross-region inference-profile
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// prefix, and the version/throughput suffix from a Bedrock model id so it
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// matches the catalog/pricing key, e.g.
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// "eu.anthropic.claude-sonnet-4-5-20250929-v1:0" -> "anthropic.claude-sonnet-4-5"
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// and the inference-profile ARN's last segment likewise. It is the single
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// source of truth shared by the proxy's request parser (which normalizes the
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// request model from the URL path), the proxy's router (which normalizes the
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// operator's registered Bedrock model ids so both sides compare equal), and
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// the management synthesizer (which keys per-provider pricing entries by the
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// normalized id the parser will emit at billing time).
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func NormalizeBedrockModel(modelID string) string {
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m := modelID
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// A full ARN (inference-profile / provisioned-throughput / foundation-model)
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// carries the model id in its last path segment.
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if strings.HasPrefix(m, "arn:") {
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if i := strings.LastIndex(m, "/"); i >= 0 {
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m = m[i+1:]
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}
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}
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for _, p := range bedrockRegionPrefixes {
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if strings.HasPrefix(m, p) {
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m = m[len(p):]
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break
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}
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}
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return bedrockVersionSuffix.ReplaceAllString(m, "")
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}
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// anthropicDatedModel matches a Claude model id carrying the trailing
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// "-YYYYMMDD" release-date suffix Anthropic appends to a pinned release,
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// capturing the id without it. The "claude" anchor is load-bearing: pricing
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// looks every model up through this helper regardless of surface, and an
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// operator may register a custom id with any shape at all, so an unanchored
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// "-\d{8}$" would let "internal-llm-20250101" silently inherit the rate
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// registered for "internal-llm". The anchor also covers the vendor-prefixed
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// forms ("anthropic.claude-...", "us.anthropic.claude-...").
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var anthropicDatedModel = regexp.MustCompile(`(?i)^(.*claude.*)-\d{8}$`)
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// NormalizeAnthropicModel strips the trailing release-date suffix from a
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// Claude model id, e.g. "claude-sonnet-4-5-20250929" -> "claude-sonnet-4-5",
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// so a dated id a client pins matches the undated one the operator
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// registered. Ids that are not Claude-family are returned untouched.
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// Callers try the verbatim id first and fall back to this, so two dated
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// releases of the same family stay distinct wherever both are registered
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// explicitly.
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func NormalizeAnthropicModel(modelID string) string {
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return anthropicDatedModel.ReplaceAllString(modelID, "$1")
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}
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// NormalizeVertexModel strips the "@version" suffix from a Vertex AI model id
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// (e.g. "claude-sonnet-4-5@20250929" -> "claude-sonnet-4-5") so it matches
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// the catalog/pricing key. Vertex publisher models are priced under their
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// vendor surface with the bare, unversioned id.
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func NormalizeVertexModel(modelID string) string {
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if at := strings.Index(modelID, "@"); at >= 0 {
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return modelID[:at]
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}
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return modelID
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}
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