github.com/qsis/helm@v3.0.0-beta.3+incompatible/internal/monocular/client.go (about)

     1  /*
     2  Copyright The Helm Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package monocular
    18  
    19  import (
    20  	"errors"
    21  	"net/url"
    22  )
    23  
    24  // ErrHostnameNotProvided indicates the url is missing a hostname
    25  var ErrHostnameNotProvided = errors.New("no hostname provided")
    26  
    27  // Client represents a client capable of communicating with the Monocular API.
    28  type Client struct {
    29  
    30  	// The base URL for requests
    31  	BaseURL string
    32  
    33  	// The internal logger to use
    34  	Log func(string, ...interface{})
    35  }
    36  
    37  // New creates a new client
    38  func New(u string) (*Client, error) {
    39  
    40  	// Validate we have a URL
    41  	if err := validate(u); err != nil {
    42  		return nil, err
    43  	}
    44  
    45  	return &Client{
    46  		BaseURL: u,
    47  		Log:     nopLogger,
    48  	}, nil
    49  }
    50  
    51  var nopLogger = func(_ string, _ ...interface{}) {}
    52  
    53  // Validate if the base URL for monocular is valid.
    54  func validate(u string) error {
    55  
    56  	// Check if it is parsable
    57  	p, err := url.Parse(u)
    58  	if err != nil {
    59  		return err
    60  	}
    61  
    62  	// Check that a host is attached
    63  	if p.Hostname() == "" {
    64  		return ErrHostnameNotProvided
    65  	}
    66  
    67  	return nil
    68  }