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|
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE NoImplicitPrelude #-}
-- | Agent Event types for observability and streaming.
--
-- Captures all events during agent execution for logging,
-- streaming to web UI, and future interactive chat.
module Omni.Agent.Event
( AgentEvent (..),
EventType (..),
eventToJSON,
eventFromJSON,
formatEventForTerminal,
)
where
import Alpha
import Data.Aeson ((.=))
import qualified Data.Aeson as Aeson
import qualified Data.Text as Text
import Data.Time (UTCTime, defaultTimeLocale, formatTime)
-- | Types of agent events
data EventType
= Assistant -- LLM text response
| ToolCall -- Tool invocation with arguments
| ToolResult -- Tool execution result
| UserMessage -- For future interactive chat
| Cost -- Token usage and cost info
| Error -- Failures and errors
| Complete -- Session ended successfully
deriving (Show, Eq, Read)
-- | A single agent event with timestamp and content
data AgentEvent = AgentEvent
{ eventType :: EventType,
eventTimestamp :: UTCTime,
eventContent :: Aeson.Value
}
deriving (Show, Eq)
-- | Convert event to JSON for storage/streaming
eventToJSON :: AgentEvent -> Aeson.Value
eventToJSON e =
Aeson.object
[ "type" .= show (eventType e),
"timestamp" .= eventTimestamp e,
"content" .= eventContent e
]
-- | Parse event from JSON
eventFromJSON :: Aeson.Value -> Maybe AgentEvent
eventFromJSON v = do
obj <- case v of
Aeson.Object o -> Just o
_ -> Nothing
typeStr <- case Aeson.lookup "type" (Aeson.toList obj) of
Just (Aeson.String t) -> Just (Text.unpack t)
_ -> Nothing
eventT <- readMaybe typeStr
ts <- case Aeson.lookup "timestamp" (Aeson.toList obj) of
Just t -> Aeson.parseMaybe Aeson.parseJSON t
_ -> Nothing
content <- Aeson.lookup "content" (Aeson.toList obj)
pure
AgentEvent
{ eventType = eventT,
eventTimestamp = ts,
eventContent = content
}
where
Aeson.lookup k pairs = snd </ find (\(k', _) -> k' == k) pairs
Aeson.toList (Aeson.Object o) = map (first Aeson.toText) (Aeson.toList o)
Aeson.toList _ = []
Aeson.toText = id
first f (a, b) = (f a, b)
-- | Format event for terminal display
formatEventForTerminal :: AgentEvent -> Text
formatEventForTerminal e =
let ts = Text.pack <| formatTime defaultTimeLocale "%H:%M:%S" (eventTimestamp e)
content = case eventType e of
Assistant -> case eventContent e of
Aeson.String t -> "Assistant: " <> truncate' 100 t
_ -> "Assistant: <message>"
ToolCall -> case eventContent e of
Aeson.Object _ ->
let toolName = getField "tool" (eventContent e)
in "Tool: " <> toolName
_ -> "Tool: <call>"
ToolResult -> case eventContent e of
Aeson.Object _ ->
let toolName = getField "tool" (eventContent e)
success = getField "success" (eventContent e)
in "Result: " <> toolName <> " (" <> success <> ")"
_ -> "Result: <result>"
UserMessage -> case eventContent e of
Aeson.String t -> "User: " <> truncate' 100 t
_ -> "User: <message>"
Cost -> case eventContent e of
Aeson.Object _ ->
let tokens = getField "tokens" (eventContent e)
cents = getField "cents" (eventContent e)
in "Cost: " <> tokens <> " tokens, " <> cents <> " cents"
_ -> "Cost: <info>"
Error -> case eventContent e of
Aeson.String t -> "Error: " <> t
_ -> "Error: <error>"
Complete -> "Complete"
in "[" <> ts <> "] " <> content
where
truncate' n t = if Text.length t > n then Text.take n t <> "..." else t
getField key val = case val of
Aeson.Object o -> case Aeson.lookup key (Aeson.toList o) of
Just (Aeson.String s) -> s
Just (Aeson.Number n) -> Text.pack (show n)
Just (Aeson.Bool b) -> if b then "ok" else "failed"
_ -> "<" <> key <> ">"
_ -> "<" <> key <> ">"
where
Aeson.lookup k pairs = snd </ find (\(k', _) -> k' == k) pairs
Aeson.toList (Aeson.Object o') = map (first' Aeson.toText) (Aeson.toList o')
Aeson.toList _ = []
Aeson.toText = id
first' f (a, b) = (f a, b)
-- Helper constructors for common events
mkAssistantEvent :: UTCTime -> Text -> AgentEvent
mkAssistantEvent ts content =
AgentEvent
{ eventType = Assistant,
eventTimestamp = ts,
eventContent = Aeson.String content
}
mkToolCallEvent :: UTCTime -> Text -> Aeson.Value -> AgentEvent
mkToolCallEvent ts toolName args =
AgentEvent
{ eventType = ToolCall,
eventTimestamp = ts,
eventContent = Aeson.object ["tool" .= toolName, "args" .= args]
}
mkToolResultEvent :: UTCTime -> Text -> Bool -> Text -> AgentEvent
mkToolResultEvent ts toolName success output =
AgentEvent
{ eventType = ToolResult,
eventTimestamp = ts,
eventContent =
Aeson.object
[ "tool" .= toolName,
"success" .= success,
"output" .= output
]
}
mkCostEvent :: UTCTime -> Int -> Int -> AgentEvent
mkCostEvent ts tokens cents =
AgentEvent
{ eventType = Cost,
eventTimestamp = ts,
eventContent = Aeson.object ["tokens" .= tokens, "cents" .= cents]
}
mkErrorEvent :: UTCTime -> Text -> AgentEvent
mkErrorEvent ts msg =
AgentEvent
{ eventType = Error,
eventTimestamp = ts,
eventContent = Aeson.String msg
}
mkCompleteEvent :: UTCTime -> AgentEvent
mkCompleteEvent ts =
AgentEvent
{ eventType = Complete,
eventTimestamp = ts,
eventContent = Aeson.Null
}
|
