integrate request builder into HTTP client for googleapis support (#157)

client.go

@@ -0,0 +1,122 @@
+package http
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+	"sync"
+	"time"
+
+	"go.unistack.org/micro/v4/client"
+	"go.unistack.org/micro/v4/errors"
+	"go.unistack.org/micro/v4/options"
+	"go.unistack.org/micro/v4/semconv"
+	"go.unistack.org/micro/v4/tracer"
+)
+
+var DefaultContentType = "application/json"
+
+type Client struct {
+	funcCall   client.FuncCall
+	funcStream client.FuncStream
+	httpClient *http.Client
+	opts       client.Options
+	mu         sync.RWMutex
+}
+
+func NewClient(opts ...client.Option) *Client {
+	clientOpts := client.NewOptions(opts...)
+
+	if len(clientOpts.ContentType) == 0 {
+		clientOpts.ContentType = DefaultContentType
+	}
+
+	c := &Client{opts: clientOpts}
+
+	dialer, ok := httpDialerFromOpts(clientOpts)
+	if !ok {
+		dialer = defaultHTTPDialer()
+	}
+
+	c.httpClient, ok = httpClientFromOpts(clientOpts)
+	if !ok {
+		c.httpClient = defaultHTTPClient(dialer, clientOpts.TLSConfig)
+	}
+
+	c.funcCall = c.fnCall
+	c.funcStream = c.fnStream
+
+	return c
+}
+
+func (c *Client) Name() string {
+	return c.opts.Name
+}
+
+func (c *Client) Init(opts ...client.Option) error {
+	for _, o := range opts {
+		o(&c.opts)
+	}
+
+	c.opts.Hooks.EachPrev(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case client.HookCall:
+			c.funcCall = h(c.funcCall)
+		case client.HookStream:
+			c.funcStream = h(c.funcStream)
+		}
+	})
+
+	return nil
+}
+
+func (c *Client) Options() client.Options {
+	return c.opts
+}
+
+func (c *Client) NewRequest(service, method string, req any, opts ...client.RequestOption) client.Request {
+	reqOpts := client.NewRequestOptions(opts...)
+	if reqOpts.ContentType == "" {
+		reqOpts.ContentType = c.opts.ContentType
+	}
+
+	return &httpRequest{
+		service: service,
+		method:  method,
+		request: req,
+		opts:    reqOpts,
+	}
+}
+
+func (c *Client) Call(ctx context.Context, req client.Request, rsp any, opts ...client.CallOption) error {
+	ts := time.Now()
+	c.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Inc()
+	var sp tracer.Span
+	ctx, sp = c.opts.Tracer.Start(ctx, req.Endpoint()+" rpc-client",
+		tracer.WithSpanKind(tracer.SpanKindClient),
+		tracer.WithSpanLabels("endpoint", req.Endpoint()),
+	)
+	err := c.funcCall(ctx, req, rsp, opts...)
+	c.opts.Meter.Counter(semconv.ClientRequestInflight, "endpoint", req.Endpoint()).Dec()
+	te := time.Since(ts)
+	c.opts.Meter.Summary(semconv.ClientRequestLatencyMicroseconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+	c.opts.Meter.Histogram(semconv.ClientRequestDurationSeconds, "endpoint", req.Endpoint()).Update(te.Seconds())
+
+	if me := errors.FromError(err); me == nil {
+		sp.Finish()
+		c.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "success", "code", strconv.Itoa(int(200))).Inc()
+	} else {
+		sp.SetStatus(tracer.SpanStatusError, err.Error())
+		c.opts.Meter.Counter(semconv.ClientRequestTotal, "endpoint", req.Endpoint(), "status", "failure", "code", strconv.Itoa(int(me.Code))).Inc()
+	}
+
+	return err
+}
+
+func (c *Client) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Stream, error) {
+	return c.funcStream(ctx, req, opts...)
+}
+
+func (c *Client) String() string {
+	return "http"
+}