README
¶
Lenses Client (Go)
The Lenses REST API client written in Go.
Installation
The only requirement is the Go Programming Language version 1.19+ and a Lenses Box of version 5.1 at least.
$ go install github.com/lensesio/lenses-go/v5/cmd/lenses-cli@latest
This command will install both the client library for development usage and the CLI in $PATH (setup your $GOPATH/bin if you didn't already).
CLI
Lenses offers a powerful CLI (command-line tool) built in Go that utilizes the REST and WebSocket APIs of Lenses, to communicate with Apache Kafka and exposes a straight forward way to perform common data engineering and site reliability engineering tasks, such as:
- Automate your CI/CD (continuous-integration and continuous-delivery)
- Create topics/acls/quotas/schemas/connectors/processors
- Change or retrieve configurations to store in github
Documentation
Please navigate to https://docs.lenses.io/dev/lenses-cli/ to learn how to install and use the lenses-cli.
Development
Build
lenses-go use go modules as dependency management system. For daily development workflow you need to use Makefile with certain actions.
Builds a binary based on your current OS system
make build
Builds binaries for all OS systems
make cross-build
Lint
We use the Golang golint for linting using:
make lint
Tests
If you want to run the tests, use the following:
make test
Clean
Clean all binaries and coverage files:
make clean
Client
Getting started
import "github.com/lensesio/lenses-go/v5"
Authentication
// Prepare authentication using raw Username and Password.
//
// Use it when Lenses setup with "BASIC" or "LDAP" authentication.
auth := lenses.BasicAuthentication{Username: "user", Password: "pass"}
auth := lenses.KerberosAuthentication{
ConfFile: "/etc/krb5.conf",
Method: lenses.KerberosWithPassword{
Realm: "my.realm or default if empty",
Username: "user",
Password: "pass",
},
}
auth := lenses.KerberosAuthentication{
ConfFile: "/etc/krb5.conf",
Method: lenses.KerberosWithKeytab{KeytabFile: "/home/me/krb5_my_keytab.txt"},
}
auth := lenses.KerberosAuthentication{
ConfFile: "/etc/krb5.conf",
Method: lenses.KerberosFromCCache{CCacheFile: "/tmp/krb5_my_cache_file.conf"},
}
Custom auth can be implement as well:
Authenticate(client *lenses.Client) error, see client_authentication.go file for more.
Config
// Prepare the client's configuration based on the host and the authentication above.
currentConfig := lenses.ClientConfig{Host: "domain.com", Authentication: auth, Timeout: "15s", Debug: true}
// Creating the client using the configuration.
client, err := lenses.OpenConnection(currentConfig)
if err != nil {
// handle error.
}
Read Config from any io.Reader or file
// ReadConfig reads and decodes Config from an io.Reader based on a custom unmarshaler.
// This can be useful to read configuration via network or files (see `ReadConfigFromFile`).
// Sets the `outPtr`. Retruns a non-nil error on any unmarshaler's errors.
ReadConfig(r io.Reader, unmarshaler UnmarshalFunc, outPtr *Config) error
// ReadConfigFromFile reads and decodes Config from a file based on a custom unmarshaler,
// `ReadConfigFromJSON` and `ReadConfigFromYAML` are the internal users,
// but the end-developer can use any custom type of decoder to read a configuration file
// with ease using this function, but keep note that the default behavior of the fields
// depend on the existing unmarshalers, use these tag names to map your decoder's properties.
//
// Accepts the absolute or the relative path of the configuration file.
// Sets the `outPtr`. Retruns a non-nil error if parsing or decoding the file failed or file doesn't exist.
ReadConfigFromFile(filename string, unmarshaler UnmarshalFunc, outPtr *Config) error
// TryReadConfigFromFile will try to read a specific file and unmarshal to `Config`.
// It will try to read it with one of these built'n formats:
// 1. JSON
// 2. YAML
TryReadConfigFromFile(filename string, outPtr *Config) error
// TryReadConfigFromHome will try to read the `Config`
// from the current user's home directory/.lenses, the lookup is based on
// the common configuration filename pattern:
// lenses-cli.json, lenses-cli.yml or lenses.json and lenses.yml.
TryReadConfigFromHome(outPtr *Config) bool
// TryReadConfigFromExecutable will try to read the `Config`
// from the (client's caller's) executable path that started the current process.
// The lookup is based on the common configuration filename pattern:
// lenses-cli.json, lenses-cli.yml or lenses.json and lenses.yml.
TryReadConfigFromExecutable(outPtr *Config) bool
// TryReadConfigFromCurrentWorkingDir will try to read the `Config`
// from the current working directory, note that it may differs from the executable path.
// The lookup is based on the common configuration filename pattern:
// lenses-cli.json, lenses-cli.yml or lenses.json and lenses.yml.
TryReadConfigFromCurrentWorkingDir(outPtr *Config) bool
// ReadConfigFromJSON reads and decodes Config from a json file, i.e `configuration.json`.
//
// Accepts the absolute or the relative path of the configuration file.
// Error may occur when the file doesn't exists or is not formatted correctly.
ReadConfigFromJSON(filename string, outPtr *Config) error
// ReadConfigFromYAML reads and decodes Config from a yaml file, i.e `configuration.yml`.
//
// Accepts the absolute or the relative path of the configuration file.
// Error may occur when the file doesn't exists or is not formatted correctly.
ReadConfigFromYAML(filename string, outPtr *Config) error
Example Code:
# file: ./lenses.yml
CurrentContext: main
Contexts:
main:
Host: https://<your-lenses-host-url>
Kerberos:
ConfFile: /etc/krb5.conf
WithPassword:
Username: the_username
Password: the_password
Realm: empty_for_default
Usage:
var config lenses.Config
err := lenses.ReadConfigFromYAML("./lenses.yml", &config)
if err != nil {
// handle error.
}
client, err := lenses.OpenConnection(*config.GetCurrent())
Configcontains tons of capabilities and helpers, you can quickly check them by navigating to the config.go source file.
API Calls
All lenses-go#Client methods return a typed value based on the call
and an error as second output to catch any errors coming from backend or client, forget panics.
Go types are first class citizens here, we will not confuse you or let you work based on luck!
topics, err := client.GetTopics()
if err != nil {
// handle error.
}
// Print the length of the topics we've just received from our Lenses Box.
print(len(topics))
Example on how deeply we make the difference here:
Client#GetTopics returns []lenses.Topic, so you can work safely.
topics[0].ConsumersGroup[0].Coordinator.Host
Documentation
Detailed documentation can be found at godocs.
Versioning
- http://semver.org/
- https://en.wikipedia.org/wiki/Software_versioning
- https://wiki.debian.org/UpstreamGuide#Releases_and_Versions
License
Distributed under Apache Version 2.0 License, click here for more details.
Documentation
¶
Overview ¶
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION ¶
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction, and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity. For the purposes of this definition, "control" means (i) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (ii) ownership of fifty percent (50%) or more of the outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications, including but not limited to software source code, documentation source, and configuration files.
"Object" form shall mean any form resulting from mechanical transformation or translation of a Source form, including but not limited to compiled object code, generated documentation, and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or Object form, made available under the License, as indicated by a copyright notice that is included in or attached to the work (an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object form, that is based on (or derived from) the Work and for which the editorial revisions, annotations, elaborations, or other modifications represent, as a whole, an original work of authorship. For the purposes of this License, Derivative Works shall not include works that remain separable from, or merely link (or bind by name) to the interfaces of, the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including the original version of the Work and any modifications or additions to that Work or Derivative Works thereof, that is intentionally submitted to Licensor for inclusion in the Work by the copyright owner or by an individual or Legal Entity authorized to submit on behalf of the copyright owner. For the purposes of this definition, "submitted" means any form of electronic, verbal, or written communication sent to the Licensor or its representatives, including but not limited to communication on electronic mailing lists, source code control systems, and issue tracking systems that are managed by, or on behalf of, the Licensor for the purpose of discussing and improving the Work, but excluding communication that is conspicuously marked or otherwise designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity on behalf of whom a Contribution has been received by Licensor and subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare Derivative Works of, publicly display, publicly perform, sublicense, and distribute the Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of this License, each Contributor hereby grants to You a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable (except as stated in this section) patent license to make, have made, use, offer to sell, sell, import, and otherwise transfer the Work, where such license applies only to those patent claims licensable by such Contributor that are necessarily infringed by their Contribution(s) alone or by combination of their Contribution(s) with the Work to which such Contribution(s) was submitted. If You institute patent litigation against any entity (including a cross-claim or counterclaim in a lawsuit) alleging that the Work or a Contribution incorporated within the Work constitutes direct or contributory patent infringement, then any patent licenses granted to You under this License for that Work shall terminate as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the Work or Derivative Works thereof in any medium, with or without modifications, and in Source or Object form, provided that You meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
distribution, then any Derivative Works that You distribute must include a readable copy of the attribution notices contained within such NOTICE file, excluding those notices that do not pertain to any part of the Derivative Works, in at least one of the following places: within a NOTICE text file distributed as part of the Derivative Works; within the Source form or documentation, if provided along with the Derivative Works; or, within a display generated by the Derivative Works, if and wherever such third-party notices normally appear. The contents of the NOTICE file are for informational purposes only and do not modify the License. You may add Your own attribution notices within Derivative Works that You distribute, alongside or as an addendum to the NOTICE text from the Work, provided that such additional attribution notices cannot be construed as modifying the License.
You may add Your own copyright statement to Your modifications and may provide additional or different license terms and conditions for use, reproduction, or distribution of Your modifications, or for any such Derivative Works as a whole, provided Your use, reproduction, and distribution of the Work otherwise complies with the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise, any Contribution intentionally submitted for inclusion in the Work by You to the Licensor shall be under the terms and conditions of this License, without any additional terms or conditions. Notwithstanding the above, nothing herein shall supersede or modify the terms of any separate license agreement you may have executed with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade names, trademarks, service marks, or product names of the Licensor, except as required for reasonable and customary use in describing the origin of the Work and reproducing the content of the NOTICE file.
7. Disclaimer of Warranty. Unless required by applicable law or agreed to in writing, Licensor provides the Work (and each Contributor provides its Contributions) on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied, including, without limitation, any warranties or conditions of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are solely responsible for determining the appropriateness of using or redistributing the Work and assume any risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory, whether in tort (including negligence), contract, or otherwise, unless required by applicable law (such as deliberate and grossly negligent acts) or agreed to in writing, shall any Contributor be liable to You for damages, including any direct, indirect, special, incidental, or consequential damages of any character arising as a result of this License or out of the use or inability to use the Work (including but not limited to damages for loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses), even if such Contributor has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing the Work or Derivative Works thereof, You may choose to offer, and charge a fee for, acceptance of support, warranty, indemnity, or other liability obligations and/or rights consistent with this License. However, in accepting such obligations, You may act only on Your own behalf and on Your sole responsibility, not on behalf of any other Contributor, and only if You agree to indemnify, defend, and hold each Contributor harmless for any liability incurred by, or claims asserted against, such Contributor by reason of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS ¶
Copyright 2020 Lenses.io Ltd.
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
Source Files
Directories
¶
| Path | Synopsis |
|---|---|
|
cmd
|
|
|
lenses-cli
Package main provides the command line based tool for the Lenses client REST API.
|
Package main provides the command line based tool for the Lenses client REST API. |
|
api
This code is automatically generated based on the open api spec of: Lenses API, version: v5.0.0-12-g2721a0e54.
|
This code is automatically generated based on the open api spec of: Lenses API, version: v5.0.0-12-g2721a0e54. |
|
connection
The Lenses API has two groups of endpoints to manage connections: a "generic" one and several "specific" ones.
|
The Lenses API has two groups of endpoints to manage connections: a "generic" one and several "specific" ones. |