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102 lines
2.7 KiB
Go
102 lines
2.7 KiB
Go
// Copyright 2015 Alexander Palaistras. All rights reserved.
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// Use of this source code is governed by the MIT license that can be found in
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// the LICENSE file.
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// Package context contains methods related to PHP engine execution contexts. It
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// allows for binding Go variables and executing PHP scripts as a single request.
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package context
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// #cgo CFLAGS: -I/usr/include/php -I/usr/include/php/main -I/usr/include/php/TSRM
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// #cgo CFLAGS: -I/usr/include/php/Zend
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// #cgo LDFLAGS: -lphp5
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//
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// #include <stdlib.h>
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// #include "context.h"
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import "C"
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import (
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"fmt"
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"io"
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"unsafe"
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"github.com/deuill/go-php/value"
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)
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// Context represents an individual execution context.
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type Context struct {
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context *C.struct__engine_context
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writer io.Writer
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values map[string]*value.Value
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}
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// Bind allows for binding Go values into the current execution context under
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// a certain name. Bind returns an error if attempting to bind an invalid value
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// (check the documentation for value.New for what is considered to be a "valid"
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// value).
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func (c *Context) Bind(name string, val interface{}) error {
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v, err := value.New(val)
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if err != nil {
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return err
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}
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n := C.CString(name)
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defer C.free(unsafe.Pointer(n))
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if _, err = C.context_bind(c.context, n, v.Ptr()); err != nil {
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v.Destroy()
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return fmt.Errorf("Binding value '%v' to context failed", val)
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}
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c.values[name] = v
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return nil
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}
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// Exec executes a PHP script pointed to by filename in the current execution
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// context, and returns an error, if any. Output produced by the script is
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// written to the context's pre-defined io.Writer instance.
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func (c *Context) Exec(filename string) error {
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name := C.CString(filename)
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defer C.free(unsafe.Pointer(name))
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_, err := C.context_exec(c.context, name)
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if err != nil {
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return fmt.Errorf("Error executing script '%s' in context", filename)
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}
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return nil
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}
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// Write copies data in the context's pre-defined io.Writer instance. It is
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// largely used internally, but is part of the context's public API due to
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// architectural contstraints.
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func (c *Context) Write(p []byte) (int, error) {
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return c.writer.Write(p)
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}
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// Destroy tears down the current execution context along with any values
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// binded in.
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func (c *Context) Destroy() {
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for _, v := range c.values {
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v.Destroy()
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}
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C.context_destroy(c.context)
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c = nil
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}
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// New creates a new execution context, passing all script output into w. It
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// returns an error if the execution context failed to initialize at any point.
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func New(w io.Writer) (*Context, error) {
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ctx := &Context{writer: w, values: make(map[string]*value.Value)}
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ptr, err := C.context_new(unsafe.Pointer(ctx))
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if err != nil {
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return nil, fmt.Errorf("Failed to initialize context for PHP engine")
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}
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ctx.context = ptr
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return ctx, nil
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}
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