firefox/toolkit/components/telemetry/core/TelemetryCommon.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef TelemetryCommon_h__
#define TelemetryCommon_h__

#include "PLDHashTable.h"
#include "js/RootingAPI.h"
#include "js/TypeDecls.h"
#include "mozilla/TypedEnumBits.h"
#include "mozilla/TelemetryProcessEnums.h"
#include "nsHashtablesFwd.h"
#include "nsTHashSet.h"
#include "nsTHashtable.h"
#include "nsIScriptError.h"
#include "nsXULAppAPI.h"

namespace mozilla {
namespace Telemetry {
namespace Common {

typedef nsTHashSet<nsCString> StringHashSet;

enum class RecordedProcessType : uint16_t {
  Main = (1 << GeckoProcessType_Default),  // Also known as "parent process"
  Content = (1 << GeckoProcessType_Content),
  Gpu = (1 << GeckoProcessType_GPU),
  Rdd = (1 << GeckoProcessType_RDD),
  Socket = (1 << GeckoProcessType_Socket),
  Utility = (1 << GeckoProcessType_Utility),
  AllChildren = 0xFFFF - 1,  // All the child processes (i.e. content, gpu, ...)
                             // Always `All-Main` to allow easy matching.
  All = 0xFFFF               // All the processes
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(RecordedProcessType);
static_assert(static_cast<uint16_t>(RecordedProcessType::Main) == 1,
              "Main process type must be equal to 1 to allow easy matching in "
              "CanRecordInProcess");

enum class SupportedProduct : uint8_t {
  Firefox = (1 << 0),
  Fennec = (1 << 1),
  // Note that `1 << 2` and `1 << 3` (former GeckoView, GeckoviewStreaming) are
  // missing in the representation. We see no point in filling it at this time.
  Thunderbird = (1 << 4),
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(SupportedProduct);

template <class EntryType>
class AutoHashtable : public nsTHashtable<EntryType> {
 public:
  explicit AutoHashtable(
      uint32_t initLength = PLDHashTable::kDefaultInitialLength);
  typedef bool (*ReflectEntryFunc)(EntryType* entry, JSContext* cx,
                                   JS::Handle<JSObject*> obj);
  bool ReflectIntoJS(ReflectEntryFunc entryFunc, JSContext* cx,
                     JS::Handle<JSObject*> obj);
};

template <class EntryType>
AutoHashtable<EntryType>::AutoHashtable(uint32_t initLength)
    : nsTHashtable<EntryType>(initLength) {}

/**
 * Reflect the individual entries of table into JS, usually by defining
 * some property and value of obj.  entryFunc is called for each entry.
 */
template <typename EntryType>
bool AutoHashtable<EntryType>::ReflectIntoJS(ReflectEntryFunc entryFunc,
                                             JSContext* cx,
                                             JS::Handle<JSObject*> obj) {
  for (auto iter = this->Iter(); !iter.Done(); iter.Next()) {
    if (!entryFunc(iter.Get(), cx, obj)) {
      return false;
    }
  }
  return true;
}

bool IsExpiredVersion(const char* aExpiration);
bool IsInDataset(uint32_t aDataset, uint32_t aContainingDataset);
bool CanRecordDataset(uint32_t aDataset, bool aCanRecordBase,
                      bool aCanRecordExtended);
bool CanRecordInProcess(RecordedProcessType aProcesses,
                        GeckoProcessType aProcess);
bool CanRecordInProcess(RecordedProcessType aProcesses, ProcessID aProcess);
bool CanRecordProduct(SupportedProduct aProducts);

/**
 * Return the number of milliseconds since process start using monotonic
 * timestamps (unaffected by system clock changes). Depending on the platform,
 * this can include the time the device was suspended (Windows) or not (Linux,
 * macOS).
 *
 * @return NS_OK on success.
 */
nsresult MsSinceProcessStart(double* aResult);

/**
 * Return the number of milliseconds since process start using monotonic
 * timestamps (unaffected by system clock changes), including the time the
 * system was suspended.
 *
 * @return NS_OK on success, NS_ERROR_NOT_AVAILABLE if the data is unavailable
 * (this can happen on old operating systems).
 */
nsresult MsSinceProcessStartIncludingSuspend(double* aResult);

/**
 * Return the number of milliseconds since process start using monotonic
 * timestamps (unaffected by system clock changes), excluding the time the
 * system was suspended.
 *
 * @return NS_OK on success, NS_ERROR_NOT_AVAILABLE if the data is unavailable
 * (this can happen on old operating systems).
 */
nsresult MsSinceProcessStartExcludingSuspend(double* aResult);

/**
 * Dumps a log message to the Browser Console using the provided level.
 *
 * @param aLogLevel The level to use when displaying the message in the browser
 * console (e.g. nsIScriptError::warningFlag, ...).
 * @param aMsg The text message to print to the console.
 */
void LogToBrowserConsole(uint32_t aLogLevel, const nsAString& aMsg);

/**
 * Get the name string for a ProcessID.
 * This is the name we use for the Telemetry payloads.
 */
const char* GetNameForProcessID(ProcessID process);

/**
 * Get the process id give a process name.
 *
 * @param aProcessName - the name of the process.
 * @returns {ProcessID} one value from ProcessID::* or ProcessID::Count if the
 *          name of the process was not found.
 */
ProcessID GetIDForProcessName(const char* aProcessName);

/**
 * Get the GeckoProcessType for a ProcessID.
 * Telemetry distinguishes between more process types than the GeckoProcessType,
 * so the mapping is not direct.
 */
GeckoProcessType GetGeckoProcessType(ProcessID process);

/**
 * Check if the passed telemetry identifier is valid.
 *
 * @param aStr The string identifier.
 * @param aMaxLength The maximum length of the identifier.
 * @param aAllowInfixPeriod Whether or not to allow infix dots.
 * @param aAllowInfixUnderscore Whether or not to allow infix underscores.
 * @returns true if the string validates correctly, false otherwise.
 */
bool IsValidIdentifierString(const nsACString& aStr, const size_t aMaxLength,
                             const bool aAllowInfixPeriod,
                             const bool aAllowInfixUnderscore);

/**
 * Convert the given UTF8 string to a JavaScript string.  The returned
 * string's contents will be the UTF16 conversion of the given string.
 *
 * @param cx The JS context.
 * @param aStr The UTF8 string.
 * @returns a JavaScript string.
 */
JSString* ToJSString(JSContext* cx, const nsACString& aStr);

/**
 * Convert the given UTF16 string to a JavaScript string.
 *
 * @param cx The JS context.
 * @param aStr The UTF16 string.
 * @returns a JavaScript string.
 */
JSString* ToJSString(JSContext* cx, const nsAString& aStr);

/**
 * Get an identifier for the currently-running product.
 * This is not stable over time and may change.
 *
 * @returns the product identifier
 */
SupportedProduct GetCurrentProduct();

}  // namespace Common
}  // namespace Telemetry
}  // namespace mozilla

#endif  // TelemetryCommon_h__