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|
package providerhealth
import (
"context"
"encoding/json"
"io"
"log/slog"
"net/http"
"strings"
"time"
"aigw/internal/catalog"
"aigw/internal/domain"
)
type ProbeMetrics interface {
ProviderProbe(success bool)
}
type ProbeOptions struct {
Enabled bool
Interval time.Duration
Timeout time.Duration
Catalog *catalog.Catalog
Tracker *Tracker
Metrics ProbeMetrics
Logger *slog.Logger
Client *http.Client
}
type Prober struct {
enabled bool
interval time.Duration
timeout time.Duration
catalog *catalog.Catalog
tracker *Tracker
metrics ProbeMetrics
logger *slog.Logger
client *http.Client
}
type probeTarget struct {
provider domain.Provider
keys []RouteKey
}
func NewProber(options ProbeOptions) *Prober {
if options.Interval <= 0 {
options.Interval = 30 * time.Second
}
if options.Timeout <= 0 {
options.Timeout = 5 * time.Second
}
if options.Logger == nil {
options.Logger = slog.Default()
}
if options.Client == nil {
transport := http.DefaultTransport.(*http.Transport).Clone()
transport.Proxy = http.ProxyFromEnvironment
options.Client = &http.Client{Transport: transport, Timeout: options.Timeout}
}
return &Prober{enabled: options.Enabled, interval: options.Interval, timeout: options.Timeout,
catalog: options.Catalog, tracker: options.Tracker, metrics: options.Metrics, logger: options.Logger, client: options.Client}
}
func (p *Prober) Run(ctx context.Context) {
if p == nil || !p.enabled || p.catalog == nil || p.tracker == nil {
return
}
p.ProbeOnce(ctx)
ticker := time.NewTicker(p.interval)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
p.ProbeOnce(ctx)
}
}
}
func (p *Prober) ProbeOnce(ctx context.Context) {
for _, target := range p.targets() {
if ctx.Err() != nil {
return
}
p.probe(ctx, target)
}
}
func (p *Prober) targets() []probeTarget {
providerIndexes := make(map[string]int)
seen := make(map[RouteKey]struct{})
result := make([]probeTarget, 0)
for _, model := range p.catalog.AllModels() {
for _, route := range model.Routes {
key := RouteKey{ModelID: model.ID, ProviderID: route.Provider.ID, WireAPI: route.Provider.EffectiveWireAPI()}
if key.ProviderID == "" {
continue
}
if _, exists := seen[key]; exists {
continue
}
seen[key] = struct{}{}
index, exists := providerIndexes[route.Provider.ID]
if !exists {
index = len(result)
providerIndexes[route.Provider.ID] = index
result = append(result, probeTarget{provider: route.Provider})
}
result[index].keys = append(result[index].keys, key)
}
}
return result
}
func (p *Prober) probe(parent context.Context, target probeTarget) {
ctx, cancel := context.WithTimeout(parent, p.timeout)
defer cancel()
request, err := http.NewRequestWithContext(ctx, http.MethodGet, providerModelsURL(target.provider), nil)
if err != nil {
p.observe(target, 0, 0, false)
return
}
request.Header.Set("Accept", "application/json")
request.Header.Set("User-Agent", "aigw-health/0.1")
if target.provider.Protocol == domain.ProtocolAnthropic {
request.Header.Set("x-api-key", target.provider.APIKey)
request.Header.Set("anthropic-version", "2023-06-01")
} else {
request.Header.Set("Authorization", "Bearer "+target.provider.APIKey)
}
started := time.Now()
response, err := p.client.Do(request)
latency := time.Since(started)
if err != nil {
p.observe(target, 0, latency, false)
p.logger.Warn("provider_probe_failed", "provider_id", target.provider.ID, "error", err)
return
}
body, readErr := io.ReadAll(io.LimitReader(response.Body, 1<<20))
_ = response.Body.Close()
success := response.StatusCode >= 200 && response.StatusCode < 300 && readErr == nil &&
strings.HasPrefix(strings.ToLower(response.Header.Get("Content-Type")), "application/json") && validModelsEnvelope(body)
p.observe(target, response.StatusCode, latency, success)
if !success {
p.logger.Warn("provider_probe_failed", "provider_id", target.provider.ID, "status_code", response.StatusCode)
}
}
func (p *Prober) observe(target probeTarget, statusCode int, latency time.Duration, success bool) {
for _, key := range target.keys {
p.tracker.Observe(key, Observation{StatusCode: statusCode, Latency: latency, Failed: !success, Active: true})
}
if p.metrics != nil {
p.metrics.ProviderProbe(success)
}
}
func validModelsEnvelope(body []byte) bool {
var envelope struct {
Data []json.RawMessage `json:"data"`
}
return json.Unmarshal(body, &envelope) == nil && envelope.Data != nil
}
func providerModelsURL(provider domain.Provider) string {
baseURL := strings.TrimRight(provider.BaseURL, "/")
return baseURL + "/models"
}
|
