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client.go
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client.go
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package grpc
import (
"context"
"time"
"github.com/alexfalkowski/go-service/retry"
"github.com/alexfalkowski/go-service/security"
"github.com/alexfalkowski/go-service/telemetry/tracer"
t "github.com/alexfalkowski/go-service/time"
"github.com/alexfalkowski/go-service/transport/grpc/breaker"
"github.com/alexfalkowski/go-service/transport/grpc/meta"
szap "github.com/alexfalkowski/go-service/transport/grpc/telemetry/logger/zap"
"github.com/alexfalkowski/go-service/transport/grpc/telemetry/metrics"
gtracer "github.com/alexfalkowski/go-service/transport/grpc/telemetry/tracer"
r "github.com/grpc-ecosystem/go-grpc-middleware/retry"
"go.opentelemetry.io/otel/metric"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/grpc/keepalive"
)
// ClientOption for gRPC.
type ClientOption interface{ apply(opts *clientOpts) }
type clientOpts struct {
logger *zap.Logger
tracer gtracer.Tracer
meter metric.Meter
retry *retry.Config
breaker bool
userAgent string
opts []grpc.DialOption
unary []grpc.UnaryClientInterceptor
stream []grpc.StreamClientInterceptor
security grpc.DialOption
}
type clientOptionFunc func(*clientOpts)
func (f clientOptionFunc) apply(o *clientOpts) { f(o) }
// WithClientRetry for gRPC.
func WithClientRetry(cfg *retry.Config) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.retry = cfg
})
}
// WithClientBreaker for gRPC.
func WithClientBreaker() ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.breaker = true
})
}
// WithClientSecure for gRPC.
func WithClientSecure(sec *security.Config) (ClientOption, error) {
var creds credentials.TransportCredentials
if security.IsEnabled(sec) {
conf, err := security.NewClientTLSConfig(sec)
if err != nil {
return nil, err
}
creds = credentials.NewTLS(conf)
} else {
creds = credentials.NewClientTLSFromCert(nil, "")
}
opt := clientOptionFunc(func(o *clientOpts) {
o.security = grpc.WithTransportCredentials(creds)
})
return opt, nil
}
// WithClientDialOption for gRPC.
func WithClientDialOption(opts ...grpc.DialOption) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.opts = opts
})
}
// WithClientUnaryInterceptors for gRPC.
func WithClientUnaryInterceptors(unary ...grpc.UnaryClientInterceptor) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.unary = unary
})
}
// WithClientUnaryInterceptors for gRPC.
func WithClientStreamInterceptors(stream ...grpc.StreamClientInterceptor) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.stream = stream
})
}
// WithClientLogger for gRPC.
func WithClientLogger(logger *zap.Logger) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.logger = logger
})
}
// WithClientTracer for gRPC.
func WithClientTracer(tracer gtracer.Tracer) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.tracer = tracer
})
}
// WithClientMetrics for gRPC.
func WithClientMetrics(meter metric.Meter) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.meter = meter
})
}
// WithUserAgent for gRPC.
func WithClientUserAgent(userAgent string) ClientOption {
return clientOptionFunc(func(o *clientOpts) {
o.userAgent = userAgent
})
}
// NewDialOptions for gRPC.
func NewDialOptions(opts ...ClientOption) ([]grpc.DialOption, error) {
cis, err := UnaryClientInterceptors(opts...)
if err != nil {
return nil, err
}
os := clientOptions(opts...)
sto, err := streamDialOption(os)
if err != nil {
return nil, err
}
grpcOpts := []grpc.DialOption{
grpc.WithUserAgent(os.userAgent),
grpc.WithKeepaliveParams(keepalive.ClientParameters{
Time: t.Timeout,
Timeout: t.Timeout,
PermitWithoutStream: true,
}),
}
grpcOpts = append(grpcOpts, grpc.WithChainUnaryInterceptor(cis...), sto, os.security)
grpcOpts = append(grpcOpts, os.opts...)
return grpcOpts, nil
}
// NewClient to host for gRPC.
func NewClient(ctx context.Context, host string, opts ...ClientOption) (*grpc.ClientConn, error) {
os, err := NewDialOptions(opts...)
if err != nil {
return nil, err
}
return grpc.DialContext(ctx, host, os...)
}
// UnaryClientInterceptors for gRPC.
func UnaryClientInterceptors(opts ...ClientOption) ([]grpc.UnaryClientInterceptor, error) {
os := clientOptions(opts...)
unary := []grpc.UnaryClientInterceptor{}
unary = append(unary, os.unary...)
if os.retry != nil {
d, err := time.ParseDuration(os.retry.Timeout)
if err != nil {
return nil, err
}
unary = append(unary,
r.UnaryClientInterceptor(
r.WithCodes(codes.Unavailable, codes.DataLoss),
r.WithMax(os.retry.Attempts),
r.WithBackoff(r.BackoffLinear(t.Backoff)),
r.WithPerRetryTimeout(d),
),
)
}
if os.breaker {
unary = append(unary, breaker.UnaryClientInterceptor())
}
if os.logger != nil {
unary = append(unary, szap.UnaryClientInterceptor(os.logger))
}
if os.meter != nil {
client, err := metrics.NewClient(os.meter)
if err != nil {
return nil, err
}
unary = append(unary, client.UnaryInterceptor())
}
unary = append(unary, gtracer.UnaryClientInterceptor(os.tracer))
unary = append(unary, meta.UnaryClientInterceptor(os.userAgent))
return unary, nil
}
func streamDialOption(opts *clientOpts) (grpc.DialOption, error) {
stream := []grpc.StreamClientInterceptor{}
stream = append(stream, opts.stream...)
if opts.logger != nil {
stream = append(stream, szap.StreamClientInterceptor(opts.logger))
}
if opts.meter != nil {
client, err := metrics.NewClient(opts.meter)
if err != nil {
return nil, err
}
stream = append(stream, client.StreamInterceptor())
}
stream = append(stream, gtracer.StreamClientInterceptor(opts.tracer))
stream = append(stream, meta.StreamClientInterceptor(opts.userAgent))
return grpc.WithChainStreamInterceptor(stream...), nil
}
func clientOptions(opts ...ClientOption) *clientOpts {
os := &clientOpts{
security: grpc.WithTransportCredentials(insecure.NewCredentials()),
tracer: tracer.NewNoopTracer("grpc"),
}
for _, o := range opts {
o.apply(os)
}
return os
}