[wpiutil] Add C API for DataLog (#5509)

wpiutil/src/main/native/cpp/DataLog.cpp

@@ -815,7 +815,160 @@ void DataLog::AppendStringArray(int entry,
   }
   uint8_t* buf = StartRecord(entry, timestamp, size, 4);
   wpi::support::endian::write32le(buf, arr.size());
-  for (auto sv : arr) {
+  for (auto&& sv : arr) {
     AppendStringImpl(sv);
   }
 }
+
+void DataLog::AppendStringArray(int entry,
+                                std::span<const WPI_DataLog_String> arr,
+                                int64_t timestamp) {
+  if (entry <= 0) {
+    return;
+  }
+  // storage: 4-byte array length, each string prefixed by 4-byte length
+  // calculate total size
+  size_t size = 4;
+  for (auto&& str : arr) {
+    size += 4 + str.len;
+  }
+  std::scoped_lock lock{m_mutex};
+  if (m_paused) {
+    return;
+  }
+  uint8_t* buf = StartRecord(entry, timestamp, size, 4);
+  wpi::support::endian::write32le(buf, arr.size());
+  for (auto&& sv : arr) {
+    AppendStringImpl(sv.str);
+  }
+}
+
+extern "C" {
+
+struct WPI_DataLog* WPI_DataLog_Create(const char* dir, const char* filename,
+                                       double period, const char* extraHeader) {
+  return reinterpret_cast<WPI_DataLog*>(
+      new DataLog{dir, filename, period, extraHeader});
+}
+
+struct WPI_DataLog* WPI_DataLog_Create_Func(
+    void (*write)(void* ptr, const uint8_t* data, size_t len), void* ptr,
+    double period, const char* extraHeader) {
+  return reinterpret_cast<WPI_DataLog*>(
+      new DataLog{[=](auto data) { write(ptr, data.data(), data.size()); },
+                  period, extraHeader});
+}
+
+void WPI_DataLog_Release(struct WPI_DataLog* datalog) {
+  delete reinterpret_cast<DataLog*>(datalog);
+}
+
+void WPI_DataLog_SetFilename(struct WPI_DataLog* datalog,
+                             const char* filename) {
+  reinterpret_cast<DataLog*>(datalog)->SetFilename(filename);
+}
+
+void WPI_DataLog_Flush(struct WPI_DataLog* datalog) {
+  reinterpret_cast<DataLog*>(datalog)->Flush();
+}
+
+void WPI_DataLog_Pause(struct WPI_DataLog* datalog) {
+  reinterpret_cast<DataLog*>(datalog)->Pause();
+}
+
+void WPI_DataLog_Resume(struct WPI_DataLog* datalog) {
+  reinterpret_cast<DataLog*>(datalog)->Resume();
+}
+
+int WPI_DataLog_Start(struct WPI_DataLog* datalog, const char* name,
+                      const char* type, const char* metadata,
+                      int64_t timestamp) {
+  return reinterpret_cast<DataLog*>(datalog)->Start(name, type, metadata,
+                                                    timestamp);
+}
+
+void WPI_DataLog_Finish(struct WPI_DataLog* datalog, int entry,
+                        int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->Finish(entry, timestamp);
+}
+
+void WPI_DataLog_SetMetadata(struct WPI_DataLog* datalog, int entry,
+                             const char* metadata, int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->SetMetadata(entry, metadata, timestamp);
+}
+
+void WPI_DataLog_AppendRaw(struct WPI_DataLog* datalog, int entry,
+                           const uint8_t* data, size_t len, int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendRaw(entry, {data, len}, timestamp);
+}
+
+void WPI_DataLog_AppendBoolean(struct WPI_DataLog* datalog, int entry,
+                               int value, int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendBoolean(entry, value, timestamp);
+}
+
+void WPI_DataLog_AppendInteger(struct WPI_DataLog* datalog, int entry,
+                               int64_t value, int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendInteger(entry, value, timestamp);
+}
+
+void WPI_DataLog_AppendFloat(struct WPI_DataLog* datalog, int entry,
+                             float value, int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendFloat(entry, value, timestamp);
+}
+
+void WPI_DataLog_AppendDouble(struct WPI_DataLog* datalog, int entry,
+                              double value, int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendDouble(entry, value, timestamp);
+}
+
+void WPI_DataLog_AppendString(struct WPI_DataLog* datalog, int entry,
+                              const char* value, size_t len,
+                              int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendString(entry, {value, len},
+                                                    timestamp);
+}
+
+void WPI_DataLog_AppendBooleanArray(struct WPI_DataLog* datalog, int entry,
+                                    const int* arr, size_t len,
+                                    int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendBooleanArray(entry, {arr, len},
+                                                          timestamp);
+}
+
+void WPI_DataLog_AppendBooleanArrayByte(struct WPI_DataLog* datalog, int entry,
+                                        const uint8_t* arr, size_t len,
+                                        int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendBooleanArray(entry, {arr, len},
+                                                          timestamp);
+}
+
+void WPI_DataLog_AppendIntegerArray(struct WPI_DataLog* datalog, int entry,
+                                    const int64_t* arr, size_t len,
+                                    int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendIntegerArray(entry, {arr, len},
+                                                          timestamp);
+}
+
+void WPI_DataLog_AppendFloatArray(struct WPI_DataLog* datalog, int entry,
+                                  const float* arr, size_t len,
+                                  int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendFloatArray(entry, {arr, len},
+                                                        timestamp);
+}
+
+void WPI_DataLog_AppendDoubleArray(struct WPI_DataLog* datalog, int entry,
+                                   const double* arr, size_t len,
+                                   int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendDoubleArray(entry, {arr, len},
+                                                         timestamp);
+}
+
+void WPI_DataLog_AppendStringArray(struct WPI_DataLog* datalog, int entry,
+                                   const WPI_DataLog_String* arr, size_t len,
+                                   int64_t timestamp) {
+  reinterpret_cast<DataLog*>(datalog)->AppendStringArray(entry, {arr, len},
+                                                         timestamp);
+}
+
+}  // extern "C"

wpiutil/src/main/native/include/wpi/DataLog.h

@@ -6,6 +6,7 @@
 
 #include <stdint.h>
 
+#ifdef __cplusplus
 #include <functional>
 #include <initializer_list>
 #include <memory>
@@ -19,6 +20,20 @@
 #include "wpi/StringMap.h"
 #include "wpi/condition_variable.h"
 #include "wpi/mutex.h"
+#endif  // __cplusplus
+
+/**
+ * A datalog string (for use with string array).
+ */
+struct WPI_DataLog_String {
+  /** Contents. */
+  const char* str;
+
+  /** Length. */
+  size_t len;
+};
+
+#ifdef __cplusplus
 
 namespace wpi {
 class Logger;
@@ -333,6 +348,16 @@ class DataLog final {
   void AppendStringArray(int entry, std::span<const std::string_view> arr,
                          int64_t timestamp);
 
+  /**
+   * Appends a string array record to the log.
+   *
+   * @param entry Entry index, as returned by Start()
+   * @param arr String array to record
+   * @param timestamp Time stamp (may be 0 to indicate now)
+   */
+  void AppendStringArray(int entry, std::span<const WPI_DataLog_String> arr,
+                         int64_t timestamp);
+
  private:
   void WriterThreadMain(std::string_view dir);
   void WriterThreadMain(
@@ -797,3 +822,268 @@ class StringArrayLogEntry : public DataLogEntry {
 };
 
 }  // namespace wpi::log
+
+extern "C" {
+#endif  // __cplusplus
+
+/** C-compatible data log (opaque struct). */
+struct WPI_DataLog;
+
+/**
+ * Construct a new Data Log.  The log will be initially created with a
+ * temporary filename.
+ *
+ * @param dir directory to store the log
+ * @param filename filename to use; if none provided, a random filename is
+ *                 generated of the form "wpilog_{}.wpilog"
+ * @param period time between automatic flushes to disk, in seconds;
+ *               this is a time/storage tradeoff
+ * @param extraHeader extra header data
+ */
+struct WPI_DataLog* WPI_DataLog_Create(const char* dir, const char* filename,
+                                       double period, const char* extraHeader);
+
+/**
+ * Construct a new Data Log that passes its output to the provided function
+ * rather than a file.  The write function will be called on a separate
+ * background thread and may block.  The write function is called with an
+ * empty data array (data=NULL, len=0) when the thread is terminating.
+ *
+ * @param write write function
+ * @param ptr pointer to pass to write function ptr parameter
+ * @param period time between automatic calls to write, in seconds;
+ *               this is a time/storage tradeoff
+ * @param extraHeader extra header data
+ */
+struct WPI_DataLog* WPI_DataLog_Create_Func(
+    void (*write)(void* ptr, const uint8_t* data, size_t len), void* ptr,
+    double period, const char* extraHeader);
+
+/**
+ * Releases a data log object. Closes the file and returns resources to the
+ * system.
+ *
+ * @param datalog data log
+ */
+void WPI_DataLog_Release(struct WPI_DataLog* datalog);
+
+/**
+ * Change log filename.
+ *
+ * @param datalog data log
+ * @param filename filename
+ */
+void WPI_DataLog_SetFilename(struct WPI_DataLog* datalog, const char* filename);
+
+/**
+ * Explicitly flushes the log data to disk.
+ *
+ * @param datalog data log
+ */
+void WPI_DataLog_Flush(struct WPI_DataLog* datalog);
+
+/**
+ * Pauses appending of data records to the log.  While paused, no data records
+ * are saved (e.g. AppendX is a no-op).  Has no effect on entry starts /
+ * finishes / metadata changes.
+ *
+ * @param datalog data log
+ */
+void WPI_DataLog_Pause(struct WPI_DataLog* datalog);
+
+/**
+ * Resumes appending of data records to the log.
+ *
+ * @param datalog data log
+ */
+void WPI_DataLog_Resume(struct WPI_DataLog* datalog);
+
+/**
+ * Start an entry.  Duplicate names are allowed (with the same type), and
+ * result in the same index being returned (Start/Finish are reference
+ * counted).  A duplicate name with a different type will result in an error
+ * message being printed to the console and 0 being returned (which will be
+ * ignored by the Append functions).
+ *
+ * @param datalog data log
+ * @param name Name
+ * @param type Data type
+ * @param metadata Initial metadata (e.g. data properties)
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ *
+ * @return Entry index
+ */
+int WPI_DataLog_Start(struct WPI_DataLog* datalog, const char* name,
+                      const char* type, const char* metadata,
+                      int64_t timestamp);
+
+/**
+ * Finish an entry.
+ *
+ * @param datalog data log
+ * @param entry Entry index
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_Finish(struct WPI_DataLog* datalog, int entry,
+                        int64_t timestamp);
+
+/**
+ * Updates the metadata for an entry.
+ *
+ * @param datalog data log
+ * @param entry Entry index
+ * @param metadata New metadata for the entry
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_SetMetadata(struct WPI_DataLog* datalog, int entry,
+                             const char* metadata, int64_t timestamp);
+
+/**
+ * Appends a raw record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param data Byte array to record
+ * @param len Length of byte array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendRaw(struct WPI_DataLog* datalog, int entry,
+                           const uint8_t* data, size_t len, int64_t timestamp);
+
+/**
+ * Appends a boolean record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param value Boolean value to record
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendBoolean(struct WPI_DataLog* datalog, int entry,
+                               int value, int64_t timestamp);
+
+/**
+ * Appends an integer record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param value Integer value to record
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendInteger(struct WPI_DataLog* datalog, int entry,
+                               int64_t value, int64_t timestamp);
+
+/**
+ * Appends a float record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param value Float value to record
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendFloat(struct WPI_DataLog* datalog, int entry,
+                             float value, int64_t timestamp);
+
+/**
+ * Appends a double record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param value Double value to record
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendDouble(struct WPI_DataLog* datalog, int entry,
+                              double value, int64_t timestamp);
+
+/**
+ * Appends a string record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param value String value to record
+ * @param len Length of string
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendString(struct WPI_DataLog* datalog, int entry,
+                              const char* value, size_t len, int64_t timestamp);
+
+/**
+ * Appends a boolean array record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param arr Boolean array to record
+ * @param len Number of elements in array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendBooleanArray(struct WPI_DataLog* datalog, int entry,
+                                    const int* arr, size_t len,
+                                    int64_t timestamp);
+
+/**
+ * Appends a boolean array record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param arr Boolean array to record
+ * @param len Number of elements in array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendBooleanArrayByte(struct WPI_DataLog* datalog, int entry,
+                                        const uint8_t* arr, size_t len,
+                                        int64_t timestamp);
+
+/**
+ * Appends an integer array record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param arr Integer array to record
+ * @param len Number of elements in array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendIntegerArray(struct WPI_DataLog* datalog, int entry,
+                                    const int64_t* arr, size_t len,
+                                    int64_t timestamp);
+
+/**
+ * Appends a float array record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param arr Float array to record
+ * @param len Number of elements in array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendFloatArray(struct WPI_DataLog* datalog, int entry,
+                                  const float* arr, size_t len,
+                                  int64_t timestamp);
+
+/**
+ * Appends a double array record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param arr Double array to record
+ * @param len Number of elements in array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendDoubleArray(struct WPI_DataLog* datalog, int entry,
+                                   const double* arr, size_t len,
+                                   int64_t timestamp);
+
+/**
+ * Appends a string array record to the log.
+ *
+ * @param datalog data log
+ * @param entry Entry index, as returned by WPI_DataLog_Start()
+ * @param arr String array to record
+ * @param len Number of elements in array
+ * @param timestamp Time stamp (may be 0 to indicate now)
+ */
+void WPI_DataLog_AppendStringArray(struct WPI_DataLog* datalog, int entry,
+                                   const WPI_DataLog_String* arr, size_t len,
+                                   int64_t timestamp);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus