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[proxy] Select the LLM parser by request path before provider_id

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Gateway catalog entries pin provider_id "openai", and the same record
serves Claude Code on /v1/messages. The parser preferred the pinned id
over the path, so an Anthropic body was read with the OpenAI parser: on a
streaming response the input tokens ride message_start nested under
message, which that parser never reads, so input counted as zero. Both
cache buckets were dropped, and pricing resolved against the openai
surface where no claude-* model exists, skipping cost entirely.

Detect from the path first and keep provider_id as the fallback for
upstreams whose path carries no surface. The Kimi entry already leaves
ParserID empty to work around this; the fallback ordering makes that
unnecessary.
This commit is contained in:
mlsmaycon
2026-08-22 21:14:05 +02:00
committed by GitHub
parent 9ad1d9a39a
commit ed7eec7c3e
2 changed files with 35 additions and 5 deletions
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proxy/internal/middleware/builtin/llm_request_parser/middleware.go
+10 -5
View File
@@ -72,9 +72,9 @@ func (middlewareImpl) Close() error { return nil }
// Invoke detects the LLM provider, parses request facts, and emits
// metadata. Always returns DecisionAllow; never errors. Provider
// selection prefers the configured providerID (synthesiser-stamped on
// agent-network targets) so requests routed to a custom upstream URL
// still resolve. Falls back to URL sniffing when no providerID is set.
// selection prefers the request path, falling back to the configured
// providerID (synthesiser-stamped on agent-network targets) so requests
// routed to a custom upstream URL still resolve.
func (m middlewareImpl) Invoke(_ context.Context, in *middleware.Input) (*middleware.Output, error) {
out := &middleware.Output{Decision: middleware.DecisionAllow}
if in == nil {
@@ -92,9 +92,14 @@ func (m middlewareImpl) Invoke(_ context.Context, in *middleware.Input) (*middle
return m.invokeBedrock(in, br), nil
}
parser, ok := llm.ParserByName(m.providerID)
// A path that names an API surface wins over the configured providerID:
// a gateway record pinned to "openai" still serves Claude Code on
// /v1/messages, and reading that body with the OpenAI parser loses the
// Anthropic usage block and prices the request on the wrong surface.
// providerID stays the fallback for upstreams whose path says nothing.
parser, ok := llm.DetectParser(extractPath(in.URL))
if !ok {
parser, ok = llm.DetectParser(extractPath(in.URL))
parser, ok = llm.ParserByName(m.providerID)
}
if !ok {
return out, nil