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andreztz/expbackoff.sh

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Created February 21, 2025 03:49
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  1. @nathforge nathforge created this gist Dec 22, 2016.
    35 changes: 35 additions & 0 deletions expbackoff.sh
    View file
    Original file line number Diff line number Diff line change
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    expbackoff() {
    # Exponential backoff: retries a command upon failure, scaling up the delay between retries.
    # Example: "expbackoff my_command --with --some --args --maybe"
    local MAX_RETRIES=${EXPBACKOFF_MAX_RETRIES:-8} # Max number of retries
    local BASE=${EXPBACKOFF_BASE:-1} # Base value for backoff calculation
    local MAX=${EXPBACKOFF_MAX:-300} # Max value for backoff calculation
    local FAILURES=0
    while ! "$@"; do
    FAILURES=$(( $FAILURES + 1 ))
    if (( $FAILURES > $MAX_RETRIES )); then
    echo "$@" >&2
    echo " * Failed, max retries exceeded" >&2
    return 1
    else
    local SECONDS=$(( $BASE * 2 ** ($FAILURES - 1) ))
    if (( $SECONDS > $MAX )); then
    SECONDS=$MAX
    fi
    echo "$@" >&2
    echo " * $FAILURES failure(s), retrying in $SECONDS second(s)" >&2
    sleep $SECONDS
    echo
    fi
    done
    }

    something_that_succeeds() { echo "I'm a winner!"; }
    something_that_fails() { echo "I'm a loser :("; return 1; }

    EXPBACKOFF_MAX_RETRIES=3 # Override default value - speeds up testing
    expbackoff something_that_succeeds --calling it with -args
    echo # Clear up the display
    expbackoff something_that_fails --calling it with -args
    echo
    echo $? # Should be 1, indicating overall failure of `something_that_fails`