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plugins.go
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plugins.go
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package plugins
import (
"context"
"github.com/b2wdigital/restQL-golang/v6/internal/domain"
"net/http"
"net/url"
"runtime/debug"
"github.com/b2wdigital/restQL-golang/v6/pkg/restql"
"github.com/pkg/errors"
"github.com/valyala/fasthttp"
)
// Lifecycle represent the hooks on the query execution.
type Lifecycle interface {
BeforeTransaction(ctx context.Context, requestCtx *fasthttp.RequestCtx) context.Context
AfterTransaction(ctx context.Context, requestCtx *fasthttp.RequestCtx) context.Context
BeforeQuery(ctx context.Context, query string, queryCtx restql.QueryContext) context.Context
AfterQuery(ctx context.Context, query string, result domain.Resources) context.Context
BeforeRequest(ctx context.Context, request restql.HTTPRequest) context.Context
AfterRequest(ctx context.Context, request restql.HTTPRequest, response restql.HTTPResponse, err error) context.Context
}
type pluginExecutor func(ctx context.Context, p restql.LifecyclePlugin) context.Context
type manager struct {
log restql.Logger
availablePlugins []restql.LifecyclePlugin
}
// NewLifecycle constructs a Lifecycle instance.
func NewLifecycle(log restql.Logger) (Lifecycle, error) {
ps := loadLifecyclePlugins(log)
if len(ps) == 0 {
log.Info("no lifecycle hook provided")
return NoOpLifecycle, nil
}
return manager{log: log, availablePlugins: ps}, nil
}
func (m manager) BeforeTransaction(ctx context.Context, requestCtx *fasthttp.RequestCtx) context.Context {
return m.executeAllPluginsWithContext(ctx, "BeforeTransaction", func(currentCtx context.Context, p restql.LifecyclePlugin) context.Context {
log := restql.GetLogger(ctx)
tr := m.newTransactionRequest(log, requestCtx)
return p.BeforeTransaction(currentCtx, tr)
})
}
func (m manager) AfterTransaction(ctx context.Context, requestCtx *fasthttp.RequestCtx) context.Context {
return m.executeAllPluginsWithContext(ctx, "AfterTransaction", func(currentCtx context.Context, p restql.LifecyclePlugin) context.Context {
tr := m.newTransactionResponse(requestCtx)
return p.AfterTransaction(currentCtx, tr)
})
}
func (m manager) BeforeQuery(ctx context.Context, query string, queryCtx restql.QueryContext) context.Context {
return m.executeAllPluginsWithContext(ctx, "BeforeQuery", func(currentCtx context.Context, p restql.LifecyclePlugin) context.Context {
return p.BeforeQuery(currentCtx, query, queryCtx)
})
}
func (m manager) AfterQuery(ctx context.Context, query string, result domain.Resources) context.Context {
return m.executeAllPluginsWithContext(ctx, "AfterQuery", func(currentCtx context.Context, p restql.LifecyclePlugin) context.Context {
r := make(map[string]interface{})
for id, resource := range result {
r[string(id)] = resource
}
return p.AfterQuery(currentCtx, query, r)
})
}
func (m manager) BeforeRequest(ctx context.Context, request restql.HTTPRequest) context.Context {
return m.executeAllPluginsWithContext(ctx, "BeforeRequest", func(currentCtx context.Context, p restql.LifecyclePlugin) context.Context {
return p.BeforeRequest(currentCtx, request)
})
}
func (m manager) AfterRequest(ctx context.Context, request restql.HTTPRequest, response restql.HTTPResponse, err error) context.Context {
return m.executeAllPluginsWithContext(ctx, "AfterRequest", func(currentCtx context.Context, p restql.LifecyclePlugin) context.Context {
return p.AfterRequest(currentCtx, request, response, err)
})
}
func (m manager) executeAllPluginsWithContext(ctx context.Context, hook string, fn pluginExecutor) context.Context {
log := restql.GetLogger(ctx)
var pluginCtx context.Context
pluginCtx = ctx
for _, p := range m.availablePlugins {
m.safeExecute(log, p.Name(), hook, func() {
pluginCtx = fn(pluginCtx, p)
})
}
return pluginCtx
}
func (m manager) safeExecute(log restql.Logger, pluginName string, hook string, fn func()) {
defer func() {
if reason := recover(); reason != nil {
err := errors.Errorf("reason : %v\n\t stack : %v", reason, string(debug.Stack()))
log.Error("plugin produced a panic", err, "name", pluginName, "hook", hook)
}
}()
fn()
}
func (m manager) newTransactionRequest(log restql.Logger, ctx *fasthttp.RequestCtx) restql.TransactionRequest {
uri, err := url.ParseRequestURI(string(ctx.RequestURI()))
if err != nil {
log.Error("failed to parse request uri for plugin", err)
}
header := make(http.Header)
ctx.Request.Header.VisitAll(func(k, v []byte) {
header.Add(string(k), string(v))
})
//todo: add header to ctx
return restql.TransactionRequest{
Url: uri,
Method: string(ctx.Method()),
Header: header,
}
}
func (m manager) newTransactionResponse(ctx *fasthttp.RequestCtx) restql.TransactionResponse {
header := make(http.Header)
ctx.Response.Header.VisitAll(func(k, v []byte) {
header.Add(string(k), string(v))
})
return restql.TransactionResponse{
Status: ctx.Response.StatusCode(),
Header: header,
Body: ctx.Response.Body(),
}
}
// NoOpLifecycle is Lifecycle implementation with no handlers.
var NoOpLifecycle Lifecycle = noOpLifecycle{}
type noOpLifecycle struct{}
func (n noOpLifecycle) BeforeTransaction(ctx context.Context, requestCtx *fasthttp.RequestCtx) context.Context {
return ctx
}
func (n noOpLifecycle) AfterTransaction(ctx context.Context, requestCtx *fasthttp.RequestCtx) context.Context {
return ctx
}
func (n noOpLifecycle) BeforeQuery(ctx context.Context, query string, queryCtx restql.QueryContext) context.Context {
return ctx
}
func (n noOpLifecycle) AfterQuery(ctx context.Context, query string, result domain.Resources) context.Context {
return ctx
}
func (n noOpLifecycle) BeforeRequest(ctx context.Context, request restql.HTTPRequest) context.Context {
return ctx
}
func (n noOpLifecycle) AfterRequest(ctx context.Context, request restql.HTTPRequest, response restql.HTTPResponse, err error) context.Context {
return ctx
}