wehub-resource-sync
45 lines
1.4 KiB
C++
45 lines
1.4 KiB
C++
#pragma once
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#include <string>
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extern "C" {
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#include "ds4.h"
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}
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namespace ds4cpp {
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// Disk-backed KV cache for ds4 sessions. Keyed by SHA1(rendered prompt prefix).
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// Format (our own, NOT bit-compatible with ds4-server's KVC files - interop
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// is a follow-up plan):
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//
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// "DS4G" (4 bytes magic) + u32 version=1 + u32 ctx_size +
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// u32 prefix_text_len + prefix_text + u64 payload_bytes + payload
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class KvCache {
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public:
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KvCache(); // disabled (dir empty)
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// Set the cache directory. Empty disables.
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void SetDir(const std::string &dir);
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// Returns the cache file path for a given rendered text prefix.
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std::string Path(const std::string &rendered_text) const;
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// Look up the longest cached prefix that is also a prefix of
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// `rendered_text`. Loads it into `session` if found. Returns the
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// matched prefix length in bytes (0 if no hit).
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size_t LoadLongestPrefix(ds4_session *session,
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const std::string &rendered_text,
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int ctx_size);
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// Save the current session, associated with this rendered text prefix.
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void Save(ds4_session *session, const std::string &rendered_text, int ctx_size);
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bool enabled() const { return !dir_.empty(); }
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private:
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std::string dir_;
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};
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// Compute SHA1 of arbitrary bytes; returns 40-char hex.
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std::string Sha1Hex(const void *data, size_t len);
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} // namespace ds4cpp
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