Documentation ¶
Overview ¶
Package gotenberg provides most of the logic of the module system.
caddyserver/caddy, licensed under the Apache License 2.0, has significantly inspired this module system.
More details are available on https://caddyserver.com/.
Index ¶
- Constants
- Variables
- func FilterDeadline(allowed, denied *regexp2.Regexp, s string, deadline time.Time) error
- func GarbageCollect(logger *zap.Logger, rootPath string, includeSubstr []string) error
- func MustRegisterModule(mod Module)
- type AlphanumericSort
- type App
- type Cmd
- type Context
- type FileSystem
- type LoggerProvider
- type LoggerProviderMock
- type Metric
- type MetricsProvider
- type MetricsProviderMock
- type Module
- type ModuleDescriptor
- type ModuleMock
- type ParsedFlags
- func (f *ParsedFlags) MustBool(name string) bool
- func (f *ParsedFlags) MustDeprecatedBool(deprecated string, newName string) bool
- func (f *ParsedFlags) MustDeprecatedDuration(deprecated string, newName string) time.Duration
- func (f *ParsedFlags) MustDeprecatedFloat64(deprecated string, newName string) float64
- func (f *ParsedFlags) MustDeprecatedHumanReadableBytesString(deprecated string, newName string) string
- func (f *ParsedFlags) MustDeprecatedInt(deprecated string, newName string) int
- func (f *ParsedFlags) MustDeprecatedInt64(deprecated string, newName string) int64
- func (f *ParsedFlags) MustDeprecatedRegexp(deprecated string, newName string) *regexp2.Regexp
- func (f *ParsedFlags) MustDeprecatedString(deprecated string, newName string) string
- func (f *ParsedFlags) MustDeprecatedStringSlice(deprecated string, newName string) []string
- func (f *ParsedFlags) MustDuration(name string) time.Duration
- func (f *ParsedFlags) MustFloat64(name string) float64
- func (f *ParsedFlags) MustHumanReadableBytesString(name string) string
- func (f *ParsedFlags) MustInt(name string) int
- func (f *ParsedFlags) MustInt64(name string) int64
- func (f *ParsedFlags) MustRegexp(name string) *regexp2.Regexp
- func (f *ParsedFlags) MustString(name string) string
- func (f *ParsedFlags) MustStringSlice(name string) []string
- type PdfEngine
- type PdfEngineMock
- type PdfEngineProvider
- type PdfEngineProviderMock
- type PdfFormats
- type Process
- type ProcessMock
- type ProcessSupervisor
- type ProcessSupervisorMock
- func (s *ProcessSupervisorMock) Healthy() bool
- func (s *ProcessSupervisorMock) Launch() error
- func (s *ProcessSupervisorMock) ReqQueueSize() int64
- func (s *ProcessSupervisorMock) RestartsCount() int64
- func (s *ProcessSupervisorMock) Run(ctx context.Context, logger *zap.Logger, task func() error) error
- func (s *ProcessSupervisorMock) Shutdown() error
- type Provisioner
- type ProvisionerMock
- type SystemLogger
- type Validator
- type ValidatorMock
Constants ¶
const ( // PdfA1a represents the PDF/A-1a format. PdfA1a string = "PDF/A-1a" // PdfA1b represents the PDF/A-1b format. PdfA1b string = "PDF/A-1b" // PdfA2a represents the PDF/A-2a format. PdfA2a string = "PDF/A-2a" // PdfA2b represents the PDF/A-2b format. PdfA2b string = "PDF/A-2b" // PdfA2u represents the PDF/A-2u format. PdfA2u string = "PDF/A-2u" // PdfA3a represents the PDF/A-3a format. PdfA3a string = "PDF/A-3a" // PdfA3b represents the PDF/A-3b format. PdfA3b string = "PDF/A-3b" // PdfA3u represents the PDF/A-3u format. PdfA3u string = "PDF/A-3u" )
Variables ¶
var ( // ErrPdfEngineMethodNotSupported is returned when a specific method of the // PdfEngine interface is not supported by its current implementation. ErrPdfEngineMethodNotSupported = errors.New("method not supported") // ErrPdfFormatNotSupported is returned when the Convert method of the // PdfEngine interface does not support a requested PDF format conversion. ErrPdfFormatNotSupported = errors.New("PDF format not supported") )
var ErrFiltered = errors.New("value filtered")
ErrFiltered happens if a value is filtered by the FilterDeadline function.
var ErrMaximumQueueSizeExceeded = errors.New("maximum queue size exceeded")
ErrMaximumQueueSizeExceeded happens if Run() is called but the maximum queue size is already used.
var ErrProcessAlreadyRestarting = errors.New("process already restarting")
ErrProcessAlreadyRestarting happens if the ProcessSupervisor is trying to restart an already restarting Process.
Functions ¶
func FilterDeadline ¶ added in v8.1.0
FilterDeadline checks if given value is allowed and not denied according to regex patterns. It returns a context.DeadlineExceeded if it takes too long to process.
func GarbageCollect ¶
GarbageCollect scans the root path and deletes files or directories with names containing specific substrings.
func MustRegisterModule ¶
func MustRegisterModule(mod Module)
MustRegisterModule registers a module.
To register a module, create an init() method in the module main go file:
func init() { gotenberg.MustRegisterModule(YourModule{}) }
Then, in the main command (github.com/gotenberg/gotenberg/v8/cmd/gotenberg), import the module:
imports ( // Gotenberg modules. _ "your_module_path" )
Types ¶
type AlphanumericSort ¶ added in v8.2.0
type AlphanumericSort []string
AlphanumericSort implements sort.Interface and helps to sort strings alphanumerically.
See https://github.com/gotenberg/gotenberg/issues/805.
func (AlphanumericSort) Len ¶ added in v8.2.0
func (s AlphanumericSort) Len() int
func (AlphanumericSort) Less ¶ added in v8.2.0
func (s AlphanumericSort) Less(i, j int) bool
func (AlphanumericSort) Swap ¶ added in v8.2.0
func (s AlphanumericSort) Swap(i, j int)
type App ¶
type App interface { Start() error // StartupMessage returns a custom message to display on startup. If it // returns an empty string, a default startup message is used instead. StartupMessage() string Stop(ctx context.Context) error }
App is a module interface for modules which can be started or stopped by the application.
type Cmd ¶
type Cmd struct {
// contains filtered or unexported fields
}
Cmd wraps an exec.Cmd.
func Command ¶
Command creates a Cmd without a context. It configures the internal exec.Cmd of Cmd so that we may kill its unix process and all its children without creating orphans.
See https://medium.com/@felixge/killing-a-child-process-and-all-of-its-children-in-go-54079af94773.
func CommandContext ¶
func CommandContext(ctx context.Context, logger *zap.Logger, binPath string, args ...string) (*Cmd, error)
CommandContext creates a Cmd with a context. It configures the internal exec.Cmd of Cmd so that we may kill its unix process and all its children without creating orphans.
See https://medium.com/@felixge/killing-a-child-process-and-all-of-its-children-in-go-54079af94773.
func (*Cmd) Exec ¶
Exec executes the command and wait for its completion or until the context is done. In any case, it kills the unix process and all its children.
func (*Cmd) Kill ¶
Kill kills the unix process and all its children without creating orphans.
See https://medium.com/@felixge/killing-a-child-process-and-all-of-its-children-in-go-54079af94773.
type Context ¶
type Context struct {
// contains filtered or unexported fields
}
Context is a struct which helps to initialize modules. When provisioning, a module may use the context to get other modules that it needs internally.
func NewContext ¶
func NewContext( flags ParsedFlags, descriptors []ModuleDescriptor, ) *Context
NewContext creates a Context. In a module, prefer the Provisioner interface to get a Context.
func (*Context) Module ¶
Module returns a module which satisfies the requested interface.
func (m *YourModule) Provision(ctx *gotenberg.Context) error { mod, _ := ctx.Module(new(ModuleInterface)) real := mod.(ModuleInterface) }
If the module has not yet been initialized, this method initializes it. Otherwise, returns the already initialized instance.
func (*Context) Modules ¶
Modules returns the list of modules which satisfies the requested interface.
func (m *YourModule) Provision(ctx *gotenberg.Context) error { mods, _ := ctx.Modules(new(ModuleInterface)) for _, mod := range mods { real := mod.(ModuleInterface) // ... } }
If one or more modules have not yet been initialized, this method initializes them. Otherwise, returns the already initialized instances.
func (*Context) ParsedFlags ¶
func (ctx *Context) ParsedFlags() ParsedFlags
ParsedFlags returns the parsed flags.
func (m *YourModule) Provision(ctx *gotenberg.Context) error { flags := ctx.ParsedFlags() m.foo = flags.RequiredString("foo") }
type FileSystem ¶
type FileSystem struct {
// contains filtered or unexported fields
}
FileSystem provides utilities for managing temporary directories. It creates unique directory names based on UUIDs to ensure isolation of temporary files for different modules.
func NewFileSystem ¶
func NewFileSystem() *FileSystem
NewFileSystem initializes a new FileSystem instance with a unique working directory.
func (*FileSystem) MkdirAll ¶
func (fs *FileSystem) MkdirAll() (string, error)
MkdirAll creates a new unique directory inside the working directory and returns its path. If the directory creation fails, an error is returned.
func (*FileSystem) NewDirPath ¶
func (fs *FileSystem) NewDirPath() string
NewDirPath generates a new unique path for a directory inside the working directory.
func (*FileSystem) WorkingDir ¶
func (fs *FileSystem) WorkingDir() string
WorkingDir returns the unique name of the working directory.
func (*FileSystem) WorkingDirPath ¶
func (fs *FileSystem) WorkingDirPath() string
WorkingDirPath constructs and returns the full path to the working directory inside the system's temporary directory.
type LoggerProvider ¶
LoggerProvider is an interface for a module that supplies a method for creating a zap.Logger instance for use by other modules.
func (m *YourModule) Provision(ctx *gotenberg.Context) error { provider, _ := ctx.Module(new(gotenberg.LoggerProvider)) logger, _ := provider.(gotenberg.LoggerProvider).Logger(m) }
type LoggerProviderMock ¶
LoggerProviderMock is a mock for the LoggerProvider interface.
type Metric ¶
type Metric struct { // Name is the unique identifier. // Required. Name string // Description describes the metric. // Optional. Description string // Read returns the current value. // Required. Read func() float64 }
Metric represents a unitary metric.
type MetricsProvider ¶
MetricsProvider is a module interface which provides a list of Metric.
func (m *YourModule) Provision(ctx *gotenberg.Context) error { provider, _ := ctx.Module(new(gotenberg.MetricsProvider)) metrics, _ := provider.(gotenberg.MetricsProvider).Metrics() }
type MetricsProviderMock ¶
MetricsProviderMock is a mock for the MetricsProvider interface.
func (*MetricsProviderMock) Metrics ¶
func (provider *MetricsProviderMock) Metrics() ([]Metric, error)
type Module ¶
type Module interface {
Descriptor() ModuleDescriptor
}
Module is a sort of plugin which adds new functionalities to the application or other modules.
type YourModule struct { property string } func (YourModule) Descriptor() gotenberg.ModuleDescriptor { return gotenberg.ModuleDescriptor{ ID: "your_module", FlagSet: func() *flag.FlagSet { fs := flag.NewFlagSet("your_module", flag.ExitOnError) fs.String("your_module-property", "default value", "flag description") return fs }(), New: func() gotenberg.Module { return new(YourModule) }, } }
type ModuleDescriptor ¶
type ModuleDescriptor struct { // ID is the unique name (snake case) of the module. // Required. ID string // FlagSet is the definition of the flags of the module. // Optional. FlagSet *flag.FlagSet // New returns a new and empty instance of the module's type. // Required. New func() Module }
ModuleDescriptor describes your module for the application.
func GetModuleDescriptors ¶
func GetModuleDescriptors() []ModuleDescriptor
GetModuleDescriptors returns the descriptors of all registered modules.
type ModuleMock ¶
type ModuleMock struct {
DescriptorMock func() ModuleDescriptor
}
ModuleMock is a mock for the Module interface.
func (*ModuleMock) Descriptor ¶
func (mod *ModuleMock) Descriptor() ModuleDescriptor
type ParsedFlags ¶
ParsedFlags wraps a flag.FlagSet so that retrieving the typed values is easier.
func (*ParsedFlags) MustBool ¶
func (f *ParsedFlags) MustBool(name string) bool
MustBool returns the boolean value of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedBool ¶
func (f *ParsedFlags) MustDeprecatedBool(deprecated string, newName string) bool
MustDeprecatedBool returns the boolean value of a deprecated flag if it was explicitly set or the int value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedDuration ¶
func (f *ParsedFlags) MustDeprecatedDuration(deprecated string, newName string) time.Duration
MustDeprecatedDuration returns the time.Duration value of a deprecated flag if it was explicitly set or the time.Duration value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedFloat64 ¶
func (f *ParsedFlags) MustDeprecatedFloat64(deprecated string, newName string) float64
MustDeprecatedFloat64 returns the float value of a deprecated flag if it was explicitly set or the float value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedHumanReadableBytesString ¶
func (f *ParsedFlags) MustDeprecatedHumanReadableBytesString(deprecated string, newName string) string
MustDeprecatedHumanReadableBytesString returns the human-readable bytes string of a deprecated flag if it was explicitly set or the human-readable bytes string of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedInt ¶
func (f *ParsedFlags) MustDeprecatedInt(deprecated string, newName string) int
MustDeprecatedInt returns the int value of a deprecated flag if it was explicitly set or the int value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedInt64 ¶
func (f *ParsedFlags) MustDeprecatedInt64(deprecated string, newName string) int64
MustDeprecatedInt64 returns the int64 value of a deprecated flag if it was explicitly set or the int64 value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedRegexp ¶
func (f *ParsedFlags) MustDeprecatedRegexp(deprecated string, newName string) *regexp2.Regexp
MustDeprecatedRegexp returns the regular expression of a deprecated flag if it was explicitly set or the regular expression of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedString ¶
func (f *ParsedFlags) MustDeprecatedString(deprecated string, newName string) string
MustDeprecatedString returns the string value of a deprecated flag if it was explicitly set or the string value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDeprecatedStringSlice ¶
func (f *ParsedFlags) MustDeprecatedStringSlice(deprecated string, newName string) []string
MustDeprecatedStringSlice returns the string slice value of a deprecated flag if it was explicitly set or the string slice value of the new flag. It panics if an error occurs.
func (*ParsedFlags) MustDuration ¶
func (f *ParsedFlags) MustDuration(name string) time.Duration
MustDuration returns the time.Duration value of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustFloat64 ¶
func (f *ParsedFlags) MustFloat64(name string) float64
MustFloat64 returns the float value of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustHumanReadableBytesString ¶
func (f *ParsedFlags) MustHumanReadableBytesString(name string) string
MustHumanReadableBytesString returns the human-readable bytes string of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustInt ¶
func (f *ParsedFlags) MustInt(name string) int
MustInt returns the int value of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustInt64 ¶
func (f *ParsedFlags) MustInt64(name string) int64
MustInt64 returns the int64 value of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustRegexp ¶
func (f *ParsedFlags) MustRegexp(name string) *regexp2.Regexp
MustRegexp returns the regular expression of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustString ¶
func (f *ParsedFlags) MustString(name string) string
MustString returns the string value of a flag given by name. It panics if an error occurs.
func (*ParsedFlags) MustStringSlice ¶
func (f *ParsedFlags) MustStringSlice(name string) []string
MustStringSlice returns the string slice value of a flag given by name. It panics if an error occurs.
type PdfEngine ¶
type PdfEngine interface { // Merge combines multiple PDFs into a single PDF. The resulting page order // is determined by the order of files provided in inputPaths. Merge(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error // Convert transforms a given PDF to the specified formats defined in // PdfFormats. If no format, it does nothing. Convert(ctx context.Context, logger *zap.Logger, formats PdfFormats, inputPath, outputPath string) error }
PdfEngine provides an interface for operations on PDFs. Implementations can utilize various tools like PDFtk, or implement functionality directly in Go.
type PdfEngineMock ¶
type PdfEngineMock struct { MergeMock func(ctx context.Context, logger *zap.Logger, inputPaths []string, outputPath string) error ConvertMock func(ctx context.Context, logger *zap.Logger, formats PdfFormats, inputPath, outputPath string) error }
PdfEngineMock is a mock for the PdfEngine interface.
func (*PdfEngineMock) Convert ¶
func (engine *PdfEngineMock) Convert(ctx context.Context, logger *zap.Logger, formats PdfFormats, inputPath, outputPath string) error
type PdfEngineProvider ¶
type PdfEngineProvider interface { // PdfEngine returns an instance of the [PdfEngine] interface for PDF operations. PdfEngine() (PdfEngine, error) }
PdfEngineProvider offers an interface to instantiate a PdfEngine. This is used to decouple the creation of a PdfEngine from its consumers.
Example:
func (m *YourModule) Provision(ctx *gotenberg.Context) error { provider, _ := ctx.Module(new(gotenberg.PdfEngineProvider)) engine, _ := provider.(gotenberg.PdfEngineProvider).PdfEngine() }
type PdfEngineProviderMock ¶
PdfEngineProviderMock is a mock for the PdfEngineProvider interface.
func (*PdfEngineProviderMock) PdfEngine ¶
func (provider *PdfEngineProviderMock) PdfEngine() (PdfEngine, error)
type PdfFormats ¶
type PdfFormats struct { // PdfA denotes the PDF/A standard format (e.g., PDF/A-1a). PdfA string // PdfUa indicates whether the PDF should comply // with the PDF/UA (Universal Accessibility) standard. PdfUa bool }
PdfFormats specifies the target formats for a PDF conversion.
type Process ¶
type Process interface { // Start initiates the process and returns an error if the process cannot // be started. Start(logger *zap.Logger) error // Stop terminates the process and returns an error if the process cannot // be stopped. Stop(logger *zap.Logger) error // Healthy checks the health of the process. It returns true if the process // is healthy; otherwise, it returns false. Healthy(logger *zap.Logger) bool }
Process is an interface that represents an abstract process and provides methods for starting, stopping, and checking the health of the process.
Implementations of this interface should handle the actual logic for starting, stopping, and ensuring the process's health.
type ProcessMock ¶
type ProcessMock struct { StartMock func(logger *zap.Logger) error StopMock func(logger *zap.Logger) error HealthyMock func(logger *zap.Logger) bool }
ProcessMock is a mock for the Process interface.
type ProcessSupervisor ¶
type ProcessSupervisor interface { // Launch starts the managed [Process]. Launch() error // Shutdown stops the managed [Process]. Shutdown() error // Healthy checks and returns the health status of the managed [Process]. // // If the process has not been started or is restarting, it is considered // healthy and true is returned. Otherwise, it returns the health status of // the actual process. Healthy() bool // Run executes a provided task while managing the state of the [Process]. // // Run manages the request queue and may restart the process if it is not // healthy or if the number of handled requests exceeds the maximum limit. // // It returns an error if the task cannot be run or if the process state // cannot be managed properly. Run(ctx context.Context, logger *zap.Logger, task func() error) error // ReqQueueSize returns the current size of the request queue. ReqQueueSize() int64 // RestartsCount returns the current number of restart. RestartsCount() int64 }
ProcessSupervisor provides methods to manage a Process, including starting, stopping, and ensuring its health.
Additionally, it allows for the execution of tasks while managing the process's state and provides functionality for limiting the number of requests that can be handled by the process, as well as managing a request queue.
func NewProcessSupervisor ¶
func NewProcessSupervisor(logger *zap.Logger, process Process, maxReqLimit, maxQueueSize int64) ProcessSupervisor
NewProcessSupervisor initializes a new ProcessSupervisor.
type ProcessSupervisorMock ¶
type ProcessSupervisorMock struct { LaunchMock func() error ShutdownMock func() error HealthyMock func() bool RunMock func(ctx context.Context, logger *zap.Logger, task func() error) error ReqQueueSizeMock func() int64 RestartsCountMock func() int64 }
ProcessSupervisorMock is a mock for the ProcessSupervisor interface.
func (*ProcessSupervisorMock) Healthy ¶
func (s *ProcessSupervisorMock) Healthy() bool
func (*ProcessSupervisorMock) Launch ¶
func (s *ProcessSupervisorMock) Launch() error
func (*ProcessSupervisorMock) ReqQueueSize ¶
func (s *ProcessSupervisorMock) ReqQueueSize() int64
func (*ProcessSupervisorMock) RestartsCount ¶
func (s *ProcessSupervisorMock) RestartsCount() int64
func (*ProcessSupervisorMock) Shutdown ¶
func (s *ProcessSupervisorMock) Shutdown() error
type Provisioner ¶
Provisioner is a module interface for modules which have to be initialized according to flags, environment variables, the context, etc.
type ProvisionerMock ¶
ProvisionerMock is a mock for the Provisioner interface.
func (*ProvisionerMock) Provision ¶
func (mod *ProvisionerMock) Provision(ctx *Context) error
type SystemLogger ¶
type SystemLogger interface {
SystemMessages() []string
}
SystemLogger is a module interface for modules which want to display messages on startup.
type Validator ¶
type Validator interface {
Validate() error
}
Validator is a module interface for modules which have to be validated after provisioning.
type ValidatorMock ¶
type ValidatorMock struct {
ValidateMock func() error
}
ValidatorMock is a mock for the Validator interface.
func (*ValidatorMock) Validate ¶
func (mod *ValidatorMock) Validate() error