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service.go
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service.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package cuefrontendopaque
import (
"bytes"
"context"
"encoding/json"
"strings"
"golang.org/x/exp/slices"
"google.golang.org/protobuf/types/known/anypb"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/parsing"
"namespacelabs.dev/foundation/internal/runtime"
"namespacelabs.dev/foundation/schema"
"namespacelabs.dev/foundation/std/pkggraph"
)
// Needs to be consistent with JSON names of cueResourceClass fields.
var serviceFields = []string{"kind", "port", "exportedPort", "ingress", "annotations", "probe", "probes"}
type cueService struct {
Kind string `json:"kind"`
Port int32 `json:"port"`
ExportedPort int32 `json:"exportedPort"`
Ingress cueIngress `json:"ingress"`
Annotations map[string]string `json:"annotations,omitempty"`
ReadinessProbe *cueServiceProbe `json:"probe"` // `probe: http: "/"`
Probes map[string]*cueServiceProbe `json:"probes"` // `probes: readiness: http: "/"`
}
type cueServiceProbe struct {
Path string `json:"http"`
}
type cueIngress struct {
Enabled bool
LoadBalancer bool
Details CueIngressDetails
}
type CueIngressDetails struct {
HttpRoutes map[string][]string `json:"httpRoutes"`
ProviderClass string `json:"provider"`
Domains []string `json:"domains"`
}
var _ json.Unmarshaler = &cueIngress{}
func (i *cueIngress) UnmarshalJSON(contents []byte) error {
if contents == nil {
return nil
}
dec := json.NewDecoder(bytes.NewReader(contents))
tok, err := dec.Token()
if err != nil {
return err
}
if tok == json.Delim('{') {
if err := json.Unmarshal(contents, &i.Details); err != nil {
return err
}
i.Enabled = true
return nil
} else if str, ok := tok.(string); ok {
switch strings.ToLower(str) {
case "true":
i.Enabled = true
return nil
case "loadbalancer":
i.LoadBalancer = true
return nil
default:
return fnerrors.New("ingress: expected 'true', 'LoadBalancer', or a full ingress definition got %q", str)
}
} else if b, ok := tok.(bool); ok {
if b {
i.Enabled = true
return nil
}
return fnerrors.New("ingress: expected 'true', 'LoadBalancer', or a full ingress definition got \"%v\"", b)
} else {
return fnerrors.New("ingress: bad value %v, expected 'true', 'LoadBalancer', or a full ingress definition", tok)
}
}
var knownKinds = []string{"tcp", schema.ClearTextGrpcProtocol, schema.GrpcProtocol, schema.HttpProtocol, schema.HttpsProtocol}
func parseService(ctx context.Context, pl pkggraph.PackageLoader, loc pkggraph.Location, name string, svc cueService) (*schema.Server_ServiceSpec, []*schema.Probe, error) {
if svc.Kind != "" && !slices.Contains(knownKinds, svc.Kind) {
return nil, nil, fnerrors.NewWithLocation(loc, "service kind is not supported: %s (support %v)", svc.Kind, strings.Join(knownKinds, ", "))
}
var endpointType schema.Endpoint_Type
if svc.Ingress.Enabled {
endpointType = schema.Endpoint_INTERNET_FACING
} else if svc.Ingress.LoadBalancer {
if err := parsing.RequireFeature(loc.Module, "experimental/service/loadbalancer"); err != nil {
return nil, nil, err
}
endpointType = schema.Endpoint_LOAD_BALANCER
} else {
endpointType = schema.Endpoint_PRIVATE
}
urlMap := &schema.HttpUrlMap{}
for _, routes := range svc.Ingress.Details.HttpRoutes {
for _, route := range routes {
urlMap.Entry = append(urlMap.Entry, &schema.HttpUrlMap_Entry{
PathPrefix: route,
})
}
}
var details *anypb.Any
if len(urlMap.Entry) > 0 {
details = &anypb.Any{}
if err := details.MarshalFrom(urlMap); err != nil {
return nil, nil, err
}
}
// For the time being, having a grpc service implies exporting all GRPC services.
if svc.Kind == schema.GrpcProtocol || svc.Kind == schema.ClearTextGrpcProtocol {
if details != nil {
return nil, nil, fnerrors.New("service metadata was already set")
}
details = &anypb.Any{}
if err := details.MarshalFrom(&schema.GrpcExportAllServices{}); err != nil {
return nil, nil, fnerrors.New("failed to serialize grpc configuration: %w", err)
}
}
parsed := &schema.Server_ServiceSpec{
Name: name,
Port: &schema.Endpoint_Port{Name: name, ContainerPort: svc.Port},
ExportedPort: svc.ExportedPort,
EndpointType: endpointType,
}
if svc.Kind != "" {
parsed.Metadata = append(parsed.Metadata, &schema.ServiceMetadata{Protocol: svc.Kind, Details: details})
} else if details != nil {
return nil, nil, fnerrors.New("service metadata is specified without kind")
}
if svc.Ingress.Details.ProviderClass != "" {
ref, err := pkggraph.ParseAndLoadRef(ctx, pl, loc, svc.Ingress.Details.ProviderClass)
if err != nil {
return nil, nil, err
}
parsed.IngressProvider = ref
}
for _, domain := range svc.Ingress.Details.Domains {
parsed.IngressDomain = append(parsed.IngressDomain, &schema.DomainSpec{
Fqdn: domain,
TlsFrontend: true,
})
}
if len(svc.Annotations) > 0 {
if err := parsing.RequireFeature(loc.Module, "experimental/service/annotations"); err != nil {
return nil, nil, err
}
x := &schema.ServiceAnnotations{}
for key, value := range svc.Annotations {
x.KeyValue = append(x.KeyValue, &schema.ServiceAnnotations_KeyValue{Key: key, Value: value})
}
slices.SortFunc(x.KeyValue, func(a, b *schema.ServiceAnnotations_KeyValue) bool {
if a.Key == b.Key {
return strings.Compare(a.Value, b.Value) < 0
}
return strings.Compare(a.Key, b.Key) < 0
})
serialized, err := anypb.New(x)
if err != nil {
return nil, nil, fnerrors.InternalError("failed to serialize annotations: %w", err)
}
parsed.Metadata = append(parsed.Metadata, &schema.ServiceMetadata{
Details: serialized,
})
}
if svc.Probes != nil && svc.ReadinessProbe != nil {
return nil, nil, fnerrors.AttachLocation(loc, fnerrors.BadInputError("probes and probe are exclusive"))
}
if svc.ReadinessProbe != nil {
probe := &schema.Probe{
Kind: runtime.FnServiceReadyz,
Http: &schema.Probe_Http{
ContainerPort: svc.Port,
Path: svc.ReadinessProbe.Path,
},
}
return parsed, []*schema.Probe{probe}, nil
}
var probes []*schema.Probe
for name, data := range svc.Probes {
kind, err := parseProbeKind(name)
if err != nil {
return nil, nil, fnerrors.AttachLocation(loc, err)
}
probes = append(probes, &schema.Probe{
Kind: kind,
Http: &schema.Probe_Http{
ContainerPort: svc.Port,
Path: data.Path,
},
})
}
return parsed, probes, nil
}