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// Copyright 2019-present Facebook Inc. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package gremlin
import (
"fmt"
"net/http"
"net/url"
)
type (
// Config offers a declarative way to construct a client.
Config struct {
Endpoint Endpoint `env:"ENDPOINT" long:"endpoint" default:"" description:"gremlin endpoint to connect to"`
DisableExpansion bool `env:"DISABLE_EXPANSION" long:"disable-expansion" description:"disable bindings expansion"`
}
// An Option configured client.
Option func(*options)
options struct {
interceptors []Interceptor
httpClient *http.Client
}
// Endpoint wraps a url to add flag unmarshaling.
Endpoint struct {
*url.URL
}
)
// WithInterceptor adds interceptors to the client's transport.
func WithInterceptor(interceptors ...Interceptor) Option {
return func(opts *options) {
opts.interceptors = append(opts.interceptors, interceptors...)
}
}
// WithHTTPClient assigns underlying http client to be used by http transport.
func WithHTTPClient(client *http.Client) Option {
return func(opts *options) {
opts.httpClient = client
}
}
// Build constructs a client from Config.
func (cfg Config) Build(opt ...Option) (c *Client, err error) {
opts := cfg.buildOptions(opt)
switch cfg.Endpoint.Scheme {
case "http", "https":
c, err = NewHTTPClient(cfg.Endpoint.String(), opts.httpClient)
default:
err = fmt.Errorf("unsupported endpoint scheme: %s", cfg.Endpoint.Scheme)
}
if err != nil {
return nil, err
}
for i := len(opts.interceptors) - 1; i >= 0; i-- {
c.Transport = opts.interceptors[i](c.Transport)
}
if !cfg.DisableExpansion {
c.Transport = ExpandBindings(c.Transport)
}
return c, nil
}
func (Config) buildOptions(opts []Option) options {
var o options
for _, opt := range opts {
opt(&o)
}
return o
}
// UnmarshalFlag implements flag.Unmarshaler interface.
func (ep *Endpoint) UnmarshalFlag(value string) (err error) {
ep.URL, err = url.Parse(value)
return
}
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