/
message.go
169 lines (133 loc) · 3.89 KB
/
message.go
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/**
* Turn DBGp messages into usable data structures.
*/
package message
import (
"encoding/base64"
"fmt"
"net/http"
"strings"
)
/**
* Identifier for local or global variable.
*
* Returned as part of the list of variables i.e. context.
*/
const localContextId = 0
const globalContextId = 1
/**
* Parse dbgp XML message.
*/
func Decode(xmlContent string) (message Message, err error) {
has_response := (-1 != strings.LastIndex(xmlContent, "</response>"))
if has_response {
response, err := decodeResponse(xmlContent)
if nil == err {
message = prepareResponseMessage(response)
}
}
has_init := (-1 != strings.LastIndex(xmlContent, "</init>"))
if has_init {
init, err := decodeInit(xmlContent)
if nil == err {
message = prepareInitMessage(init)
}
}
if !has_response && !has_init {
err = fmt.Errorf("Unknown message: %s", xmlContent)
}
return message, err
}
/**
* Prepare a message structure based on DBGp engine's initialization attempt.
*/
func prepareInitMessage(init Init) (message Message) {
message.MessageType = "init"
message.State = "starting"
message.Properties.Filename = init.FileURI
return message
}
/**
* Prepare a message structure based on DBGp engine's response.
*/
func prepareResponseMessage(response Response) (message Message) {
message.MessageType = "response"
message.State = response.Status
message.Content = response.Content
message.Properties.Filename = response.Message.Filename
message.Properties.LineNumber = response.Message.LineNo
message.Properties.ErrorMessage = response.Error.Message
message.Properties.ErrorCode = response.Error.Code
message.Properties.TxId = response.TransactionId
message.Properties.Command = response.Command
message.Properties.BreakpointId = response.Id
if len(response.Breakpoints) > 0 {
message.Breakpoints = make(map[int]Breakpoint)
for _, Breakpoint := range response.Breakpoints {
message.Breakpoints[Breakpoint.Id] = Breakpoint
}
}
if stackDepth := len(response.Stacktrace); stackDepth > 0 {
message.Stacktrace = make([]StackLevel, stackDepth)
for _, StackLevel := range response.Stacktrace {
message.Stacktrace[StackLevel.Level] = StackLevel
}
}
if response.ContextId == localContextId {
message.Context.Local = prepareVariables(response.Variables)
} else if response.ContextId == globalContextId {
message.Context.Global = prepareVariables(response.Variables)
}
return message
}
/**
* Extract variable values.
*/
func prepareVariables(vars []VariableDetails) (variables []Variable) {
if len(vars) == 0 {
return
}
for _, varDetails := range vars {
children := prepareVariables(varDetails.Variables)
hasLoadedChildren := false
if varDetails.HasChildren {
// Note: for empty arrays, we always say that we have loaded the children.
hasLoadedChildren = (varDetails.NumChildren == 0 || len(children) > 0)
}
varValue, isBase64 := extractVariableValue(varDetails)
variables = append(variables, Variable{
Fullname: varDetails.Fullname,
DisplayName: varDetails.Name,
VarType: varDetails.VarType,
Value: varValue, // Useful for basic types only.
AccessModifier: varDetails.Facet,
IsCompositeType: varDetails.HasChildren,
Children: children,
ChildCount: varDetails.NumChildren,
HasLoadedChildren: hasLoadedChildren,
IsBase64: isBase64,
})
}
return
}
/**
* Determine variable value and its encoding.
*/
func extractVariableValue(varDetails VariableDetails) (varValue string, isBase64 bool) {
varValue = varDetails.Value
isBase64 = (varDetails.Encoding == "base64")
if !isBase64 {
return
}
decoded, err := base64.StdEncoding.DecodeString(varDetails.Value)
if err != nil {
return
}
mimeType := http.DetectContentType(decoded)
isText := len(mimeType) > 4 && mimeType[0:4] == "text"
if isText {
varValue = string(decoded)
isBase64 = false
}
return varValue, isBase64
}