harn-stdlib 0.10.117

Embedded Harn standard library source catalog
Documentation 
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import { agent_emit_event } from "std/agent/state"

fn __with_cache_hit_metrics_from_envelope(cached_value: dict) -> dict {
  let metrics = {model_calls_avoided: 1}
  if type_of(cached_value) != "dict" {
    return metrics
  }
  // The caller seam wraps the LLM dict in {ok: true, value: ...}; the direct
  // form caches the LLM dict directly. Unwrap once so both read one shape.
  const llm = if cached_value?.value != nil && type_of(cached_value.value) == "dict" {
    cached_value.value
  } else {
    cached_value
  }
  const usage = llm?.usage
  if type_of(usage) == "dict" {
    let tokens_saved = 0
    if usage?.input_tokens != nil {
      tokens_saved = tokens_saved + to_int(usage.input_tokens)
    }
    if usage?.output_tokens != nil {
      tokens_saved = tokens_saved + to_int(usage.output_tokens)
    }
    if tokens_saved > 0 {
      metrics = metrics + {tokens_saved: tokens_saved}
    }
  }
  if llm?.latency_ms != nil {
    metrics = metrics + {latency_saved_ms: to_int(llm.latency_ms)}
  }
  return metrics
}

fn __with_cache_event(agent: HarnessAgent, session_id: string, name: string, payload: dict) {
  if session_id == "" {
    return
  }
  const _ = try {
    agent_emit_event(agent, session_id, name, payload)
  }
}

pub fn __with_cache_emit_hit(
  agent: HarnessAgent,
  session_id: string,
  key: any,
  cached: dict,
  opts: dict,
) -> nil {
  __with_cache_event(
    agent,
    session_id,
    "cache_hit",
    {
      key: key,
      backend: cached?.backend ?? "",
      namespace: cached?.namespace ?? "",
      provider: opts?.provider ?? "",
      model: opts?.model ?? "",
      metrics: __with_cache_hit_metrics_from_envelope(cached?.value),
    },
  )
}

pub fn __with_cache_emit_miss(
  agent: HarnessAgent,
  session_id: string,
  key: any,
  cached: dict,
  compute_ms: any,
) -> nil {
  __with_cache_event(
    agent,
    session_id,
    "cache_miss",
    {
      key: key,
      backend: cached?.backend ?? "",
      namespace: cached?.namespace ?? "",
      metrics: {compute_ms: compute_ms},
    },
  )
}