Merging upstream version 1.45.3+dfsg.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 163 insertions, 0 deletions

diff --git a/src/streaming/compression_zstd.c b/src/streaming/compression_zstd.c
new file mode 100644
index 000000000..dabc044f7
--- /dev/null
+++ b/src/streaming/compression_zstd.c
@@ -0,0 +1,163 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "compression_zstd.h"
+
+#ifdef ENABLE_ZSTD
+#include <zstd.h>
+
+void rrdpush_compressor_init_zstd(struct compressor_state *state) {
+    if(!state->initialized) {
+        state->initialized = true;
+        state->stream = ZSTD_createCStream();
+
+        if(state->level < 1)
+            state->level = 1;
+
+        if(state->level > ZSTD_maxCLevel())
+            state->level = ZSTD_maxCLevel();
+
+        size_t ret = ZSTD_initCStream(state->stream, state->level);
+        if(ZSTD_isError(ret))
+            netdata_log_error("STREAM: ZSTD_initCStream() returned error: %s", ZSTD_getErrorName(ret));
+
+        // ZSTD_CCtx_setParameter(state->stream, ZSTD_c_compressionLevel, 1);
+        // ZSTD_CCtx_setParameter(state->stream, ZSTD_c_strategy, ZSTD_fast);
+    }
+}
+
+void rrdpush_compressor_destroy_zstd(struct compressor_state *state) {
+    if(state->stream) {
+        ZSTD_freeCStream(state->stream);
+        state->stream = NULL;
+    }
+}
+
+size_t rrdpush_compress_zstd(struct compressor_state *state, const char *data, size_t size, const char **out) {
+    if(unlikely(!state || !size || !out))
+        return 0;
+
+    ZSTD_inBuffer inBuffer = {
+            .pos = 0,
+            .size = size,
+            .src = data,
+    };
+
+    size_t wanted_size = MAX(ZSTD_compressBound(inBuffer.size - inBuffer.pos), ZSTD_CStreamOutSize());
+    simple_ring_buffer_make_room(&state->output, wanted_size);
+
+    ZSTD_outBuffer outBuffer = {
+            .pos = 0,
+            .size = state->output.size,
+            .dst = (void *)state->output.data,
+    };
+
+    // compress
+    size_t ret = ZSTD_compressStream(state->stream, &outBuffer, &inBuffer);
+
+    // error handling
+    if(ZSTD_isError(ret)) {
+        netdata_log_error("STREAM: ZSTD_compressStream() return error: %s", ZSTD_getErrorName(ret));
+        return 0;
+    }
+
+    if(inBuffer.pos < inBuffer.size) {
+        netdata_log_error("STREAM: ZSTD_compressStream() left unprocessed input (source payload %zu bytes, consumed %zu bytes)",
+                          inBuffer.size, inBuffer.pos);
+        return 0;
+    }
+
+    if(outBuffer.pos == 0) {
+        // ZSTD needs more input to flush the output, so let's flush it manually
+        ret = ZSTD_flushStream(state->stream, &outBuffer);
+
+        if(ZSTD_isError(ret)) {
+            netdata_log_error("STREAM: ZSTD_flushStream() return error: %s", ZSTD_getErrorName(ret));
+            return 0;
+        }
+
+        if(outBuffer.pos == 0) {
+            netdata_log_error("STREAM: ZSTD_compressStream() returned zero compressed bytes "
+                              "(source is %zu bytes, output buffer can fit %zu bytes) "
+                              , size, outBuffer.size);
+            return 0;
+        }
+    }
+
+    state->sender_locked.total_compressions++;
+    state->sender_locked.total_uncompressed += size;
+    state->sender_locked.total_compressed += outBuffer.pos;
+
+    // return values
+    *out = state->output.data;
+    return outBuffer.pos;
+}
+
+void rrdpush_decompressor_init_zstd(struct decompressor_state *state) {
+    if(!state->initialized) {
+        state->initialized = true;
+        state->stream = ZSTD_createDStream();
+
+        size_t ret = ZSTD_initDStream(state->stream);
+        if(ZSTD_isError(ret))
+            netdata_log_error("STREAM: ZSTD_initDStream() returned error: %s", ZSTD_getErrorName(ret));
+
+        simple_ring_buffer_make_room(&state->output, MAX(COMPRESSION_MAX_CHUNK, ZSTD_DStreamOutSize()));
+    }
+}
+
+void rrdpush_decompressor_destroy_zstd(struct decompressor_state *state) {
+    if (state->stream) {
+        ZSTD_freeDStream(state->stream);
+        state->stream = NULL;
+    }
+}
+
+size_t rrdpush_decompress_zstd(struct decompressor_state *state, const char *compressed_data, size_t compressed_size) {
+    if (unlikely(!state || !compressed_data || !compressed_size))
+        return 0;
+
+    // The state.output ring buffer is always EMPTY at this point,
+    // meaning that (state->output.read_pos == state->output.write_pos)
+    // However, THEY ARE NOT ZERO.
+
+    ZSTD_inBuffer inBuffer = {
+            .pos = 0,
+            .size = compressed_size,
+            .src = compressed_data,
+    };
+
+    ZSTD_outBuffer outBuffer = {
+            .pos = 0,
+            .dst = (char *)state->output.data,
+            .size = state->output.size,
+    };
+
+    size_t ret = ZSTD_decompressStream(
+            state->stream
+            , &outBuffer
+            , &inBuffer);
+
+    if(ZSTD_isError(ret)) {
+        netdata_log_error("STREAM: ZSTD_decompressStream() return error: %s", ZSTD_getErrorName(ret));
+        return 0;
+    }
+
+    if(inBuffer.pos < inBuffer.size)
+        fatal("RRDPUSH DECOMPRESS: ZSTD ZSTD_decompressStream() decompressed %zu bytes, "
+              "but %zu bytes of compressed data remain",
+              inBuffer.pos, inBuffer.size);
+
+    size_t decompressed_size = outBuffer.pos;
+
+    state->output.read_pos = 0;
+    state->output.write_pos = outBuffer.pos;
+
+    // statistics
+    state->total_compressed += compressed_size;
+    state->total_uncompressed += decompressed_size;
+    state->total_compressions++;
+
+    return decompressed_size;
+}
+
+#endif // ENABLE_ZSTD