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package catalog
import (
"fmt"
"sort"
"strings"
"sync/atomic"
"aigw/internal/config"
"aigw/internal/domain"
)
type Catalog struct {
state atomic.Pointer[snapshot]
}
type snapshot struct {
models map[string]domain.Model
aliases map[string]string
list []domain.Model
}
func New(cfg config.Config) *Catalog {
providers := make(map[string]domain.Provider, len(cfg.Providers))
for _, provider := range cfg.Providers {
slug := provider.Slug
if slug == "" {
slug = provider.ID
}
providers[provider.ID] = domain.Provider{
ID: provider.ID,
Slug: slug,
Protocol: provider.Protocol,
WireAPI: provider.WireAPI,
BaseURL: strings.TrimRight(provider.BaseURL, "/"),
APIKey: provider.APIKey,
}
}
models := make([]domain.Model, 0, len(cfg.Models))
for _, modelCfg := range cfg.Models {
model := domain.Model{
ID: modelCfg.ID,
OwnedBy: modelCfg.OwnedBy,
InputPriceMicrosPerMillion: modelCfg.InputPriceMicrosPerMillion,
OutputPriceMicrosPerMillion: modelCfg.OutputPriceMicrosPerMillion,
CacheReadPriceMicrosPerMillion: modelCfg.CacheReadPriceMicrosPerMillion,
CacheWritePriceMicrosPerMillion: modelCfg.CacheWritePriceMicrosPerMillion,
}
for _, route := range modelCfg.Routes {
model.Routes = append(model.Routes, domain.Route{
Provider: providers[route.Provider],
UpstreamModel: route.UpstreamModel,
Priority: route.Priority,
Weight: route.Weight,
})
}
models = append(models, model)
}
return NewModels(models)
}
func NewModels(models []domain.Model) *Catalog {
catalog := &Catalog{}
catalog.Replace(models)
return catalog
}
func (c *Catalog) Replace(source []domain.Model) {
models := make(map[string]domain.Model, len(source))
aliases := make(map[string]string)
list := make([]domain.Model, 0, len(source))
for _, sourceModel := range source {
model := sourceModel
model.Routes = append([]domain.Route(nil), sourceModel.Routes...)
models[model.ID] = model
for _, alias := range model.Aliases {
aliases[alias] = model.ID
}
list = append(list, model)
}
sort.Slice(list, func(i, j int) bool { return list[i].ID < list[j].ID })
c.state.Store(&snapshot{models: models, aliases: aliases, list: list})
}
func (c *Catalog) Model(id string) (domain.Model, error) {
current := c.state.Load()
if current == nil {
return domain.Model{}, fmt.Errorf("model %q not found", id)
}
model, ok := current.models[id]
if !ok {
if canonical, aliasOK := current.aliases[id]; aliasOK {
model, ok = current.models[canonical]
}
}
if !ok {
return domain.Model{}, fmt.Errorf("model %q not found", id)
}
return model, nil
}
func (c *Catalog) ModelForPrincipal(id string, principal domain.Principal) (domain.Model, error) {
model, err := c.Model(id)
if err != nil {
return domain.Model{}, err
}
if !model.Allows(principal) {
return domain.Model{}, fmt.Errorf("model %q not allowed", id)
}
return model, nil
}
func (c *Catalog) ModelsFor(protocol domain.Protocol, principal domain.Principal) []domain.Model {
models := c.Models(protocol)
result := models[:0]
for _, model := range models {
if model.Allows(principal) {
result = append(result, model)
}
}
return result
}
func (c *Catalog) Models(protocol domain.Protocol) []domain.Model {
current := c.state.Load()
if current == nil {
return nil
}
result := make([]domain.Model, 0, len(current.list))
for _, model := range current.list {
for _, route := range model.Routes {
if protocolCompatible(route.Provider, protocol) {
result = append(result, model)
break
}
}
}
return result
}
func protocolCompatible(provider domain.Provider, requestProtocol domain.Protocol) bool {
switch requestProtocol {
case domain.ProtocolOpenAI:
return provider.Protocol == domain.ProtocolOpenAI && provider.EffectiveWireAPI() == "chat_completions"
case domain.ProtocolOpenAIResponses:
return provider.Protocol == domain.ProtocolOpenAI && provider.EffectiveWireAPI() == "responses"
case domain.ProtocolAnthropic:
return provider.Protocol == domain.ProtocolAnthropic && provider.EffectiveWireAPI() == "messages"
default:
return false
}
}
func (c *Catalog) Count() int {
current := c.state.Load()
if current == nil {
return 0
}
return len(current.list)
}
|
