pr

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Published: Mar 15, 2020 License: MIT Imports: 18 Imported by: 0

README

pr-go

NavCom analytics client for Go.

Installation

The package can be simply installed via go get, we recommend that you use a package version management system like the Go vendor directory or a tool like Godep to avoid issues related to API breaking changes introduced between major versions of the library.

To install it in the GOPATH:

go get https://github.com/fuziontech/pr-go

Documentation

So much work to be done here

Usage

package main

import (
    "os"

    "github.com/fuziontech/pr-go"
)

func main() {
    // Instantiates a client to use send messages to the navcom API.
    client := analytics.New(os.Getenv("NAVCOM_DSN"))

    // Enqueues a track event that will be sent asynchronously.
    client.Enqueue(analytics.Track{
        UserId: "test-user",
        Event:  "test-snippet",
    })

    // Flushes any queued messages and closes the client.
    client.Close()
}

License

The library is released under the MIT license.

Documentation

Index

Examples

Constants

View Source
const DefaultBatchSize = 250

This constant sets the default batch size used by client instances if none was explicitly set.

View Source
const DefaultEndpoint = "https://api.navcom.app"

This constant sets the default endpoint to which client instances send messages if none was explictly set.

View Source
const DefaultInterval = 5 * time.Second

This constant sets the default flush interval used by client instances if none was explicitly set.

View Source
const Version = "3.0.0"

Version of the client.

Variables

View Source
var (
	// This error is returned by methods of the `Client` interface when they are
	// called after the client was already closed.
	ErrClosed = errors.New("the client was already closed")

	// This error is used to notify the application that too many requests are
	// already being sent and no more messages can be accepted.
	ErrTooManyRequests = errors.New("too many requests are already in-flight")

	// This error is used to notify the client callbacks that a message send
	// failed because the JSON representation of a message exceeded the upper
	// limit.
	ErrMessageTooBig = errors.New("the message exceeds the maximum allowed size")
)

Functions

func TsToPbTs

func TsToPbTs(ts time.Time) *timestamp.Timestamp

Types

type Alias

type Alias pb.Alias

func (Alias) Validate

func (msg Alias) Validate() error

type Callback

type Callback interface {

	// This method is called for every message that was successfully sent to
	// the API.
	Success(Message)

	// This method is called for every message that failed to be sent to the
	// API and will be discarded by the client.
	Failure(Message, error)
}

Values implementing this interface are used by analytics clients to notify the application when a message send succeeded or failed.

Callback methods are called by a client's internal goroutines, there are no guarantees on which goroutine will trigger the callbacks, the calls can be made sequentially or in parallel, the order doesn't depend on the order of messages were queued to the client.

Callback methods must return quickly and not cause long blocking operations to avoid interferring with the client's internal work flow.

type Client

type Client interface {
	io.Closer

	// Queues a message to be sent by the client when the conditions for a batch
	// upload are met.
	// This is the main method you'll be using, a typical flow would look like
	// this:
	//
	//	client := analytics.New(writeKey)
	//	...
	//	client.Enqueue(analytics.Track{ ... })
	//	...
	//	client.Close()
	//
	// The method returns an error if the message queue not be queued, which
	// happens if the client was already closed at the time the method was
	// called or if the message was malformed.
	Enqueue(Message) error
}

This interface is the main API exposed by the analytics package. Values that satsify this interface are returned by the client constructors provided by the package and provide a way to send messages via the HTTP API.

func New

func New(writeKey string) Client

Instantiate a new client that uses the write key passed as first argument to send messages to the backend. The client is created with the default configuration.

func NewWithConfig

func NewWithConfig(writeKey string, config Config) (cli Client, err error)

Instantiate a new client that uses the write key and configuration passed as arguments to send messages to the backend. The function will return an error if the configuration contained impossible values (like a negative flush interval for example). When the function returns an error the returned client will always be nil.

type Config

type Config struct {

	// The endpoint to which the client connect and send their messages, set to
	// `DefaultEndpoint` by default.
	Endpoint string

	// The flushing interval of the client. Messages will be sent when they've
	// been queued up to the maximum batch size or when the flushing interval
	// timer triggers.
	Interval time.Duration

	// The HTTP transport used by the client, this allows an application to
	// redefine how requests are being sent at the HTTP level (for example,
	// to change the connection pooling policy).
	// If none is specified the client uses `http.DefaultTransport`.
	Transport http.RoundTripper

	// The logger used by the client to output info or error messages when that
	// are generated by background operations.
	// If none is specified the client uses a standard logger that outputs to
	// `os.Stderr`.
	Logger Logger

	// The callback object that will be used by the client to notify the
	// application when messages sends to the backend API succeeded or failed.
	Callback Callback

	// The maximum number of messages that will be sent in one API call.
	// Messages will be sent when they've been queued up to the maximum batch
	// size or when the flushing interval timer triggers.
	// Note that the API will still enforce a 500KB limit on each HTTP request
	// which is independent from the number of embedded messages.
	BatchSize int

	// When set to true the client will send more frequent and detailed messages
	// to its logger.
	Verbose bool

	// The default context set on each message sent by the client.
	DefaultContext *Context

	// The retry policy used by the client to resend requests that have failed.
	// The function is called with how many times the operation has been retried
	// and is expected to return how long the client should wait before trying
	// again.
	// If not set the client will fallback to use a default retry policy.
	RetryAfter func(int) time.Duration
	// contains filtered or unexported fields
}

Instances of this type carry the different configuration options that may be set when instantiating a client.

Each field's zero-value is either meaningful or interpreted as using the default value defined by the library.

type ConfigError

type ConfigError struct {

	// A human-readable message explaining why the configuration field's value
	// is invalid.
	Reason string

	// The name of the configuration field that was carrying an invalid value.
	Field string

	// The value of the configuration field that caused the error.
	Value interface{}
}

Returned by the `NewWithConfig` function when the one of the configuration fields was set to an impossible value (like a negative duration).

func (ConfigError) Error

func (e ConfigError) Error() string

type Context

type Context pb.Context

func (Context) ToPB

func (c Context) ToPB() *pb.Context

type FieldError

type FieldError struct {

	// The human-readable representation of the type of structure that wasn't
	// initialized properly.
	Type string

	// The name of the field that wasn't properly initialized.
	Name string

	// The value of the field that wasn't properly initialized.
	Value interface{}
}

Instances of this type are used to represent errors returned when a field was no initialize properly in a structure passed as argument to one of the functions of this package.

func (FieldError) Error

func (e FieldError) Error() string

type Group

type Group pb.Group

func (Group) Validate

func (msg Group) Validate() error

type Identify

type Identify pb.Identify

func (Identify) Validate

func (msg Identify) Validate() error

type Integrations

type Integrations pb.Integrations

This type is used to represent integrations in messages that support it. It is a free-form where values are most often booleans that enable or disable integrations. Here's a quick example of how this type is meant to be used:

analytics.Track{
	UserId:       "0123456789",
	Integrations: analytics.NewIntegrations()
		.EnableAll()
		.Disable("Salesforce")
		.Disable("Marketo"),
}

The specifications can be found at https://segment.com/docs/spec/common/#integrations

func NewIntegrations

func NewIntegrations() Integrations

func (Integrations) Disable

func (i Integrations) Disable(name string) Integrations

func (Integrations) DisableAll

func (i Integrations) DisableAll() Integrations

func (Integrations) Enable

func (i Integrations) Enable(name string) Integrations

func (Integrations) EnableAll

func (i Integrations) EnableAll() Integrations

func (Integrations) Set

func (i Integrations) Set(name string, value bool) Integrations

Sets an integration named by the first argument to the specified value, any value other than `false` will be interpreted as enabling the integration.

func (Integrations) ToPB

func (i Integrations) ToPB() *pb.Integrations

type Logger

type Logger interface {

	// Analytics clients call this method to log regular messages about the
	// operations they perform.
	// Messages logged by this method are usually tagged with an `INFO` log
	// level in common logging libraries.
	Logf(format string, args ...interface{})

	// Analytics clients call this method to log errors they encounter while
	// sending events to the backend servers.
	// Messages logged by this method are usually tagged with an `ERROR` log
	// level in common logging libraries.
	Errorf(format string, args ...interface{})
}

Instances of types implementing this interface can be used to define where the analytics client logs are written.

func StdLogger

func StdLogger(logger *log.Logger) Logger

This function instantiate an object that statisfies the analytics.Logger interface and send logs to standard logger passed as argument.

type Message

type Message interface {

	// Validate validates the internal structure of the message, the method must return
	// nil if the message is valid, or an error describing what went wrong.
	Validate() error
	// contains filtered or unexported methods
}

This interface is used to represent analytics objects that can be sent via a client.

Types like analytics.Track, analytics.Page, etc... implement this interface and therefore can be passed to the analytics.Client.Send method.

type Page

type Page pb.Page

func (Page) Validate

func (msg Page) Validate() error

type Product

type Product pb.Product

func (Product) ToPB

func (p Product) ToPB() *pb.Product

type Properties

type Properties pb.Properties

This type is used to represent properties in messages that support it. It is a free-form object so the application can set any value it sees fit but a few helper method are defined to make it easier to instantiate properties with common fields. Here's a quick example of how this type is meant to be used:

analytics.Page{
	UserId: "0123456789",
	Properties: analytics.NewProperties()
		.SetRevenue(10.0)
		.SetCurrency("USD"),
}

func NewProperties

func NewProperties() Properties

func (Properties) Set

func (p Properties) Set(name string, value string) Properties

func (Properties) SetCategory

func (p Properties) SetCategory(category string) Properties

func (Properties) SetCoupon

func (p Properties) SetCoupon(coupon string) Properties

func (Properties) SetCurrency

func (p Properties) SetCurrency(currency string) Properties

func (Properties) SetDiscount

func (p Properties) SetDiscount(discount float64) Properties

func (Properties) SetName

func (p Properties) SetName(name string) Properties

func (Properties) SetOrderId

func (p Properties) SetOrderId(id string) Properties

func (Properties) SetPath

func (p Properties) SetPath(path string) Properties

func (Properties) SetPrice

func (p Properties) SetPrice(price float64) Properties

func (Properties) SetProductId

func (p Properties) SetProductId(id string) Properties

func (Properties) SetProducts

func (p Properties) SetProducts(products ...Product) Properties

func (Properties) SetReferrer

func (p Properties) SetReferrer(referrer string) Properties

func (Properties) SetRepeat

func (p Properties) SetRepeat(repeat bool) Properties

func (Properties) SetRevenue

func (p Properties) SetRevenue(revenue float64) Properties

func (Properties) SetSKU

func (p Properties) SetSKU(sku string) Properties

func (Properties) SetShipping

func (p Properties) SetShipping(shipping float64) Properties

func (Properties) SetSubtotal

func (p Properties) SetSubtotal(subtotal float64) Properties

func (Properties) SetTax

func (p Properties) SetTax(tax float64) Properties

func (Properties) SetTitle

func (p Properties) SetTitle(title string) Properties

func (Properties) SetTotal

func (p Properties) SetTotal(total float64) Properties

func (Properties) SetURL

func (p Properties) SetURL(url string) Properties

func (Properties) SetValue

func (p Properties) SetValue(value float64) Properties

func (Properties) ToPB

func (p Properties) ToPB() *pb.Properties

type Screen

type Screen pb.Screen

func (Screen) Validate

func (msg Screen) Validate() error

type Track

type Track pb.Track
Example
body, server := mockServer()
defer server.Close()

client, _ := NewWithConfig("h97jamjwbh", Config{
	Endpoint:  server.URL,
	BatchSize: 1,
	now:       mockTime,
	uid:       mockId,
})
defer client.Close()

client.Enqueue(Track{
	Event:  "Download",
	UserId: "123456",
	Properties: Properties{
		ExtraFields: map[string]string{
			"application": "Segment Desktop",
			"version":     "1.1.0",
			"platform":    "osx",
		},
	}.ToPB(),
})

fmt.Printf("%s\n", <-body)
Output:

{
  "batch": [
    {
      "event": "Download",
      "messageId": "I'm unique",
      "properties": {
        "application": "Segment Desktop",
        "platform": "osx",
        "version": "1.1.0"
      },
      "timestamp": "2009-11-10T23:00:00Z",
      "type": "track",
      "userId": "123456"
    }
  ],
  "context": {
    "library": {
      "name": "analytics-go",
      "version": "3.0.0"
    }
  },
  "messageId": "I'm unique",
  "sentAt": "2009-11-10T23:00:00Z"
}

func (Track) Validate

func (msg Track) Validate() error

type Traits

type Traits pb.Traits

func NewTraits

func NewTraits() Traits

func (Traits) Set

func (t Traits) Set(field string, value string) Traits

func (Traits) SetAddress

func (t Traits) SetAddress(address string) Traits

func (Traits) SetAge

func (t Traits) SetAge(age int) Traits

func (Traits) SetAvatar

func (t Traits) SetAvatar(url string) Traits

func (Traits) SetBirthday

func (t Traits) SetBirthday(date time.Time) Traits

func (Traits) SetCreatedAt

func (t Traits) SetCreatedAt(date time.Time) Traits

func (Traits) SetDescription

func (t Traits) SetDescription(desc string) Traits

func (Traits) SetEmail

func (t Traits) SetEmail(email string) Traits

func (Traits) SetFirstName

func (t Traits) SetFirstName(firstName string) Traits

func (Traits) SetGender

func (t Traits) SetGender(gender string) Traits

func (Traits) SetLastName

func (t Traits) SetLastName(lastName string) Traits

func (Traits) SetName

func (t Traits) SetName(name string) Traits

func (Traits) SetPhone

func (t Traits) SetPhone(phone string) Traits

func (Traits) SetTitle

func (t Traits) SetTitle(title string) Traits

func (Traits) SetUsername

func (t Traits) SetUsername(username string) Traits

func (Traits) SetWebsite

func (t Traits) SetWebsite(url string) Traits

Directories

Path Synopsis
cmd
cli command

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